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firebird-mirror/src/gpre/cmd.cpp

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//____________________________________________________________
//
// PROGRAM: C preprocessor
// MODULE: cmd.cpp
// DESCRIPTION: Data definition compiler
//
// The contents of this file are subject to the Interbase Public
// License Version 1.0 (the "License"); you may not use this file
// except in compliance with the License. You may obtain a copy
// of the License at http://www.Inprise.com/IPL.html
//
// Software distributed under the License is distributed on an
// "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
// or implied. See the License for the specific language governing
// rights and limitations under the License.
//
// The Original Code was created by Inprise Corporation
// and its predecessors. Portions created by Inprise Corporation are
// Copyright (C) Inprise Corporation.
//
// All Rights Reserved.
// Contributor(s): ______________________________________.
// TMN (Mike Nordell) 11.APR.2001 - Reduce compiler warnings
//
//
//____________________________________________________________
//
//
#include "firebird.h"
#include <string.h>
#include "../gpre/gpre.h"
#include "../jrd/ibase.h"
#include "../jrd/flags.h"
#include "../gpre/cmd_proto.h"
#include "../gpre/cme_proto.h"
#include "../gpre/cmp_proto.h"
#include "../gpre/gpre_proto.h"
#include "../gpre/msc_proto.h"
#include "../gpre/gpre_meta.h"
//typedef void (*pfn_local_trigger_cb) (gpre_nod*, gpre_req*,
// void*
// /* TMN: NOTE, parameter type unknown! */
// );
// CVC: This was an unaceptable hack in the original code and Mike only
// found the problem when C++ couldn't compile. Let's see, the
// two functions that get this cast are
// void CME_expr(gpre_nod*, gpre_req*);
// and
// void CME_rse(gpre_rse*, gpre_req*);
// Obviously, they can't see a third parameter. Therefore, I've changed the
// signature, after verifying the third param was always zero.
typedef void (*pfn_local_trigger_cb) (gpre_nod*, gpre_req*);
// The call to CME_rse still needs the cast due to the different first param.
//static void add_cache(gpre_req*, const act*, DBB);
static void alter_database(gpre_req*, act*);
static void alter_domain(gpre_req*, const act*);
static void alter_index(gpre_req*, const act*);
static void alter_table(gpre_req*, const act*);
static void create_check_constraint(gpre_req*, const act*, CNSTRT);
static void create_constraint(gpre_req*, const act*, CNSTRT);
static void create_database(gpre_req*, const act*);
static void create_database_modify_dyn(gpre_req*, act*);
static void create_default_blr(gpre_req*, const TEXT*, const USHORT);
static void create_del_cascade_trg(gpre_req*, const act*, CNSTRT);
static void create_domain(gpre_req*, const act*);
static void create_domain_constraint(gpre_req*, const act*, const cnstrt*);
static void create_generator(gpre_req*, const act*);
static void create_index(gpre_req*, const ind*);
static void create_matching_blr(gpre_req*, const cnstrt*);
static void create_set_default_trg(gpre_req*, const act*, CNSTRT, bool);
static void create_set_null_trg(gpre_req*, const act*, CNSTRT, bool);
static void create_shadow(gpre_req*, act*);
static void create_table(gpre_req*, const act*);
static void create_trg_firing_cond(gpre_req*, const cnstrt*);
static void create_trigger(gpre_req*, const act*, gpre_trg*, pfn_local_trigger_cb);
static void create_upd_cascade_trg(gpre_req*, const act*, CNSTRT);
static bool create_view(gpre_req*, act*);
static void create_view_trigger(gpre_req*, const act*, gpre_trg*, GPRE_NOD, gpre_ctx**, GPRE_NOD);
static void declare_filter(gpre_req*, const act*);
static void declare_udf(gpre_req*, const act*);
static void get_referred_fields(const act*, CNSTRT);
static void grant_revoke_privileges(gpre_req*, const act*);
static void init_field_struct(gpre_fld*);
static void put_array_info(gpre_req*, const gpre_fld*);
static void put_blr(gpre_req*, USHORT, GPRE_NOD, pfn_local_trigger_cb);
static void put_computed_blr(gpre_req*, const gpre_fld*);
static void put_computed_source(gpre_req*, const gpre_fld*);
static void put_cstring(gpre_req*, USHORT, const TEXT*);
static void put_dtype(gpre_req*, const gpre_fld*);
static void put_field_attributes(gpre_req*, const gpre_fld*);
static void put_numeric(gpre_req*, USHORT, SSHORT);
static void put_short_cstring(gpre_req*, USHORT, const TEXT*);
static void put_string(gpre_req*, USHORT, const TEXT*, USHORT);
static void put_symbol(gpre_req*, int, const gpre_sym*);
static void put_trigger_blr(gpre_req*, USHORT, GPRE_NOD, pfn_local_trigger_cb);
static void put_view_trigger_blr(gpre_req*, const gpre_rel*, USHORT, gpre_trg*,
GPRE_NOD, gpre_ctx**, GPRE_NOD);
static void replace_field_names(gpre_nod* const, const gpre_nod* const,
gpre_fld* const, bool, gpre_ctx**);
static void set_statistics(gpre_req*, const act*);
#define STUFF_CHECK(n) if (request->req_base - request->req_blr + request->req_length <= (n) + 50)\
CMP_check (request,(n))
const int BLOB_BUFFER_SIZE = 4096; // to read in blr blob for default values
//____________________________________________________________
//
// Compile a single request, but do not generate any text.
// Generate port blocks, assign parameter numbers, message
// numbers, and internal idents. Compute length of request.
//
int CMD_compile_ddl(gpre_req* request)
{
IND index;
gpre_rel* relation;
// Initialize the blr string
act* action = request->req_actions;
request->req_blr = request->req_base = MSC_alloc(250);
request->req_length = 250;
request->req_flags |= REQ_exp_hand;
request->add_byte(isc_dyn_version_1);
request->add_byte(isc_dyn_begin);
switch (action->act_type) {
case ACT_alter_table:
alter_table(request, action);
break;
case ACT_alter_database:
alter_database(request, action);
break;
case ACT_alter_domain:
alter_domain(request, action);
break;
case ACT_alter_index:
alter_index(request, action);
break;
case ACT_create_database:
if (!(request->req_flags & REQ_sql_database_dyn)) {
request->req_blr = request->req_base;
create_database(request, action);
return 0;
}
create_database_modify_dyn(request, action);
break;
case ACT_create_domain:
create_domain(request, action);
break;
case ACT_create_generator:
create_generator(request, action);
break;
case ACT_create_index:
index = (IND) action->act_object;
create_index(request, index);
break;
case ACT_create_shadow:
create_shadow(request, action);
break;
case ACT_create_table:
create_table(request, action);
break;
case ACT_create_view:
if (!create_view(request, action))
return -1;
break;
case ACT_drop_database:
break;
case ACT_drop_domain:
put_cstring(request, isc_dyn_delete_global_fld,
(TEXT *) action->act_object);
request->add_end();
break;
case ACT_drop_filter:
put_cstring(request, isc_dyn_delete_filter,
(TEXT *) action->act_object);
request->add_end();
break;
case ACT_drop_index:
index = (IND) action->act_object;
put_symbol(request, isc_dyn_delete_idx, index->ind_symbol);
request->add_end();
break;
case ACT_drop_shadow:
put_numeric(request, isc_dyn_delete_shadow,
(SSHORT) (IPTR) action->act_object);
request->add_end();
break;
case ACT_drop_table:
case ACT_drop_view:
relation = (gpre_rel*) action->act_object;
put_symbol(request, isc_dyn_delete_rel, relation->rel_symbol);
request->add_end();
break;
case ACT_drop_udf:
put_cstring(request, isc_dyn_delete_function,
(TEXT *) action->act_object);
request->add_end();
break;
case ACT_dyn_grant:
grant_revoke_privileges(request, action);
break;
case ACT_dyn_revoke:
grant_revoke_privileges(request, action);
break;
case ACT_declare_filter:
declare_filter(request, action);
break;
case ACT_declare_udf:
declare_udf(request, action);
break;
case ACT_statistics:
set_statistics(request, action);
break;
default:
CPR_error("*** unknown request type node ***");
return -1;
}
request->add_end();
request->add_byte(isc_dyn_eoc);
request->req_length = request->req_blr - request->req_base;
request->req_blr = request->req_base;
return 0;
}
//____________________________________________________________
//
// Add cache file to a database.
//
/*
static void add_cache( gpre_req* request, const act* action, dbb* database)
{
TEXT file_name[254]; // CVC: Maybe MAXPATHLEN?
const fil* file = database->dbb_cache_file;
const SSHORT l = MIN((strlen(file->fil_name)), (sizeof(file_name) - 1));
strncpy(file_name, file->fil_name, l);
file_name[l] = '\0';
put_cstring(request, isc_dyn_def_cache_file, file_name);
request->add_byte(isc_dyn_file_length);
request->add_word(4);
request->add_long(file->fil_length);
request->add_end();
}
*/
//____________________________________________________________
//
// Generate dynamic DDL for modifying database.
//
static void alter_database( gpre_req* request, act* action)
{
FIL file, next;
dbb* db = (DBB) action->act_object;
request->add_byte(isc_dyn_mod_database);
// Reverse the order of files (parser left them backwards)
FIL files = db->dbb_files;
for (file = files, files = NULL; file; file = next) {
next = file->fil_next;
file->fil_next = files;
files = file;
}
for (file = files; file != NULL; file = file->fil_next) {
put_cstring(request, isc_dyn_def_file, file->fil_name);
request->add_byte(isc_dyn_file_start);
request->add_word(4);
const SLONG start = file->fil_start;
request->add_long(start);
request->add_byte(isc_dyn_file_length);
request->add_word(4);
request->add_long(file->fil_length);
request->add_end();
}
// Drop cache
/*
if (db->dbb_flags & DBB_drop_cache)
request->add_byte(isc_dyn_drop_cache);
if (db->dbb_cache_file)
add_cache(request, action, db);
*/
if (db->dbb_def_charset)
put_cstring(request, isc_dyn_fld_character_set_name,
db->dbb_def_charset);
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for CREATE DOMAIN action.
//
static void alter_domain( gpre_req* request, const act* action)
{
const gpre_fld* field = (gpre_fld*) action->act_object;
// modify field info
put_symbol(request, isc_dyn_mod_global_fld, field->fld_symbol);
const gpre_nod* default_node = field->fld_default_value;
if (default_node) {
if (default_node->nod_type == nod_erase) {
request->add_byte(isc_dyn_del_default);
}
else {
put_blr(request, isc_dyn_fld_default_value,
field->fld_default_value, CME_expr);
TEXT* default_source =
(TEXT *) MSC_alloc(field->fld_default_source->txt_length + 1);
CPR_get_text(default_source, field->fld_default_source);
put_cstring(request, isc_dyn_fld_default_source, default_source);
}
}
if (field->fld_constraints) {
request->add_byte(isc_dyn_single_validation);
for (const cnstrt* constraint = field->fld_constraints;
constraint;
constraint = constraint->cnstrt_next)
{
if (constraint->cnstrt_flags & CNSTRT_delete)
request->add_byte(isc_dyn_del_validation);
}
create_domain_constraint(request, action, field->fld_constraints);
}
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for ALTER INDEX statement
//
static void alter_index( gpre_req* request, const act* action)
{
const ind* index = (IND) action->act_object;
put_symbol(request, isc_dyn_mod_idx, index->ind_symbol);
const SSHORT value = (index->ind_flags & IND_active) ? 0 : 1;
put_numeric(request, isc_dyn_idx_inactive, value);
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for ALTER TABLE action.
//
static void alter_table( gpre_req* request, const act* action)
{
// add relation name
const gpre_rel* relation = (gpre_rel*) action->act_object;
put_symbol(request, isc_dyn_mod_rel, relation->rel_symbol);
// add field info
for (const gpre_fld* field = relation->rel_fields; field;
field = field->fld_next)
{
if (field->fld_flags & FLD_delete) {
put_symbol(request, isc_dyn_delete_local_fld, field->fld_symbol);
request->add_end();
}
else if (field->fld_flags & FLD_meta) {
if (field->fld_global) {
put_symbol(request, isc_dyn_def_local_fld, field->fld_symbol);
put_symbol(request, isc_dyn_fld_source, field->fld_global);
}
else
put_symbol(request, isc_dyn_def_sql_fld, field->fld_symbol);
put_field_attributes(request, field);
if (field->fld_default_value) {
put_blr(request, isc_dyn_fld_default_value,
field->fld_default_value, CME_expr);
TEXT* default_source = (TEXT*)
MSC_alloc(field->fld_default_source->txt_length + 1);
CPR_get_text(default_source, field->fld_default_source);
put_cstring(request, isc_dyn_fld_default_source,
default_source);
}
request->add_end();
// Any constraints defined for field being added?
if (field->fld_constraints)
create_constraint(request, action, field->fld_constraints);
}
}
// Check for any relation level ADD/DROP of constraints
if (relation->rel_constraints) {
for (const cnstrt* constraint = relation->rel_constraints;
constraint;
constraint = constraint->cnstrt_next)
{
if (constraint->cnstrt_flags & CNSTRT_delete)
put_cstring(request, isc_dyn_delete_rel_constraint,
constraint->cnstrt_name->str_string);
}
create_constraint(request, action, relation->rel_constraints);
}
request->add_end();
}
//____________________________________________________________
//
// Generate dyn for creating a CHECK constraint.
//
static void create_check_constraint( gpre_req* request, const act* action,
cnstrt* constraint)
{
gpre_trg* trigger = (gpre_trg*) MSC_alloc(TRG_LEN);
// create the INSERT trigger
trigger->trg_type = PRE_STORE_TRIGGER;
// "insert violates CHECK constraint on table"
trigger->trg_message = NULL;
trigger->trg_boolean = constraint->cnstrt_boolean;
trigger->trg_source = (STR) MSC_alloc(constraint->cnstrt_text->txt_length + 1);
CPR_get_text(trigger->trg_source->str_string, constraint->cnstrt_text);
create_trigger(request, action, trigger, CME_expr);
// create the UPDATE trigger
trigger->trg_type = PRE_MODIFY_TRIGGER;
// "update violates CHECK constraint on table"
create_trigger(request, action, trigger, CME_expr);
}
//____________________________________________________________
//
// Function
// Generate blr to express: if (old.primary_key != new.primary_key).
// do a column by column comparison.
//
static void create_trg_firing_cond( gpre_req* request, const cnstrt* constraint)
{
// count primary key columns
const gpre_lls* prim_key_fld = constraint->cnstrt_referred_fields;
const gpre_lls* field = prim_key_fld;
fb_assert(field != NULL);
USHORT prim_key_num_flds = 0;
while (field) {
prim_key_num_flds++;
field = field->lls_next;
}
fb_assert(prim_key_num_flds > 0);
// generate blr
request->add_byte(blr_if);
if (prim_key_num_flds > 1)
request->add_byte(blr_or);
USHORT num_flds = 0;
for (; prim_key_fld; prim_key_fld = prim_key_fld->lls_next) {
request->add_byte(blr_neq);
const str* prim_key_fld_name = (STR) prim_key_fld->lls_object;
request->add_byte(blr_field);
request->add_byte((SSHORT) 0);
put_cstring(request, 0, prim_key_fld_name->str_string);
request->add_byte(blr_field);
request->add_byte((SSHORT) 1);
put_cstring(request, 0, prim_key_fld_name->str_string);
++num_flds;
if (prim_key_num_flds - num_flds >= 2)
request->add_byte(blr_or);
}
}
//____________________________________________________________
//
// Function
// Generate blr to express: foreign_key == primary_key
// ie., for_key.column_1 = prim_key.column_1 and
// for_key.column_2 = prim_key.column_2 and .... so on..
//
static void create_matching_blr(gpre_req* request, const cnstrt* constraint)
{
// count primary key columns
const gpre_lls* prim_key_fld = constraint->cnstrt_referred_fields;
const gpre_lls* field = prim_key_fld;
fb_assert(field != NULL);
USHORT prim_key_num_flds = 0;
while (field) {
prim_key_num_flds++;
field = field->lls_next;
}
fb_assert(prim_key_num_flds > 0);
// count of foreign key columns
const gpre_lls* for_key_fld = constraint->cnstrt_fields;
field = for_key_fld;
fb_assert(field != NULL);
USHORT for_key_num_flds = 0;
while (field) {
for_key_num_flds++;
field = field->lls_next;
}
fb_assert(for_key_num_flds > 0);
fb_assert(prim_key_num_flds == for_key_num_flds);
request->add_byte(blr_boolean);
if (prim_key_num_flds > 1)
request->add_byte(blr_and);
USHORT num_flds = 0;
do {
request->add_byte(blr_eql);
const str* for_key_fld_name = (STR) for_key_fld->lls_object;
const str* prim_key_fld_name = (STR) prim_key_fld->lls_object;
request->add_byte(blr_field);
request->add_byte((SSHORT) 2);
put_cstring(request, 0, for_key_fld_name->str_string);
request->add_byte(blr_field);
request->add_byte((SSHORT) 0);
put_cstring(request, 0, prim_key_fld_name->str_string);
++num_flds;
if (prim_key_num_flds - num_flds >= 2)
request->add_byte(blr_and);
for_key_fld = for_key_fld->lls_next;
prim_key_fld = prim_key_fld->lls_next;
} while (num_flds < for_key_num_flds);
request->add_byte(blr_end);
}
//____________________________________________________________
// Function:
// The default_blr is passed in default_buffer. It is of the form:
// blr_version4 blr_literal ..... blr_eoc.
// strip the blr_version4/blr_version5 and blr_eoc verbs and stuff the remaining
// blr in the blr stream in the request.
//
static void create_default_blr(
gpre_req* request,
const TEXT* default_buff, const USHORT buff_size)
{
int i;
fb_assert(*default_buff == blr_version4 || *default_buff == blr_version5);
for (i = 1; ((i < buff_size) && (default_buff[i] != blr_eoc)); i++)
request->add_byte(default_buff[i]);
fb_assert(default_buff[i] == blr_eoc);
}
//____________________________________________________________
//
// Generate dyn for "on update cascade" trigger (for referential
// integrity) along with the trigger blr.
//
static void create_upd_cascade_trg( gpre_req* request, const act* action,
cnstrt* constraint)
{
gpre_lls* for_key_fld = constraint->cnstrt_fields;
gpre_lls* prim_key_fld = constraint->cnstrt_referred_fields;
gpre_rel* relation = (gpre_rel*) action->act_object;
// no trigger name is generated here. Let the engine make one up
put_string(request, isc_dyn_def_trigger, "", (USHORT) 0);
put_numeric(request, isc_dyn_trg_type, (SSHORT) POST_MODIFY_TRIGGER);
request->add_byte(isc_dyn_sql_object);
put_numeric(request, isc_dyn_trg_sequence, (SSHORT) 1);
put_numeric(request, isc_dyn_trg_inactive, (SSHORT) 0);
put_cstring(request, isc_dyn_rel_name,
constraint->cnstrt_referred_rel->str_string);
// the trigger blr
request->add_byte(isc_dyn_trg_blr);
const USHORT offset = request->req_blr - request->req_base;
request->add_word(0);
if (request->req_flags & REQ_blr_version4)
request->add_byte(blr_version4);
else
request->add_byte(blr_version5);
create_trg_firing_cond(request, constraint);
request->add_byte(blr_begin);
request->add_byte(blr_begin);
request->add_byte(blr_for);
request->add_byte(blr_rse);
// the new context for the prim. key relation
request->add_byte(1);
request->add_byte(blr_relation);
put_cstring(request, 0, relation->rel_symbol->sym_string);
// the context for the foreign key relation
request->add_byte(2);
// generate the blr for: foreign_key == primary_key
create_matching_blr(request, constraint);
request->add_byte(blr_modify);
request->add_byte((SSHORT) 2);
request->add_byte((SSHORT) 2);
request->add_byte(blr_begin);
for (; for_key_fld && prim_key_fld;
for_key_fld = for_key_fld->lls_next, prim_key_fld =
prim_key_fld->lls_next)
{
const str* for_key_fld_name = (STR) for_key_fld->lls_object;
const str* prim_key_fld_name = (STR) prim_key_fld->lls_object;
request->add_byte(blr_assignment);
request->add_byte(blr_field);
request->add_byte((SSHORT) 1);
put_cstring(request, 0, prim_key_fld_name->str_string);
request->add_byte(blr_field);
request->add_byte((SSHORT) 2);
put_cstring(request, 0, for_key_fld_name->str_string);
}
request->add_byte(blr_end);
request->add_byte(blr_end);
request->add_byte(blr_end);
request->add_byte(blr_end);
request->add_byte(blr_eoc);
const USHORT length = request->req_blr - request->req_base - offset - 2;
request->req_base[offset] = (UCHAR) length;
request->req_base[offset + 1] = (UCHAR) (length >> 8);
// end of the blr
// no trg_source and no trg_description
request->add_byte(isc_dyn_end);
}
//____________________________________________________________
//
// Generate dyn for "on delete cascade" trigger (for referential
// integrity) along with the trigger blr.
//
static void create_del_cascade_trg( gpre_req* request, const act* action,
cnstrt* constraint)
{
const gpre_rel* relation = (gpre_rel*) action->act_object;
// stuff a trigger_name of size 0. So the dyn-parser will make one up.
put_string(request, isc_dyn_def_trigger, "", (USHORT) 0);
put_numeric(request, isc_dyn_trg_type, (SSHORT) POST_ERASE_TRIGGER);
request->add_byte(isc_dyn_sql_object);
put_numeric(request, isc_dyn_trg_sequence, (SSHORT) 1);
put_numeric(request, isc_dyn_trg_inactive, (SSHORT) 0);
put_cstring(request, isc_dyn_rel_name,
constraint->cnstrt_referred_rel->str_string);
// the trigger blr
request->add_byte(isc_dyn_trg_blr);
const USHORT offset = request->req_blr - request->req_base;
request->add_word(0);
if (request->req_flags & REQ_blr_version4)
request->add_byte(blr_version4);
else
request->add_byte(blr_version5);
request->add_byte(blr_for);
request->add_byte(blr_rse);
// the context for the prim. key relation
request->add_byte(1);
request->add_byte(blr_relation);
put_cstring(request, 0, relation->rel_symbol->sym_string);
// the context for the foreign key relation
request->add_byte(2);
create_matching_blr(request, constraint);
request->add_byte(blr_erase);
request->add_byte((SSHORT) 2);
request->add_byte(blr_eoc);
const USHORT length = request->req_blr - request->req_base - offset - 2;
request->req_base[offset] = (UCHAR) length;
request->req_base[offset + 1] = (UCHAR) (length >> 8);
// end of the blr
// no trg_source and no trg_description
request->add_byte(isc_dyn_end);
}
//____________________________________________________________
//
// Generate dyn for "on delete|update set default" trigger (for
// referential integrity) along with the trigger blr.
// The non_upd_trg parameter == true is an update trigger.
//
static void create_set_default_trg(gpre_req* request,
const act* action,
cnstrt* constraint,
bool on_upd_trg)
{
gpre_rel* rel;
gpre_req* req;
act* request_action;
TEXT s[512];
TEXT default_val[BLOB_BUFFER_SIZE];
fb_assert(request->req_actions->act_type == ACT_create_table ||
request->req_actions->act_type == ACT_alter_table);
gpre_lls* for_key_fld = constraint->cnstrt_fields;
const gpre_rel* relation = (gpre_rel*) action->act_object;
// no trigger name. It is generated by the engine
put_string(request, isc_dyn_def_trigger, "", (USHORT) 0);
put_numeric(request, isc_dyn_trg_type,
(SSHORT) (on_upd_trg ? POST_MODIFY_TRIGGER :
POST_ERASE_TRIGGER));
request->add_byte(isc_dyn_sql_object);
put_numeric(request, isc_dyn_trg_sequence, (SSHORT) 1);
put_numeric(request, isc_dyn_trg_inactive, (SSHORT) 0);
put_cstring(request, isc_dyn_rel_name,
constraint->cnstrt_referred_rel->str_string);
// the trigger blr
request->add_byte(isc_dyn_trg_blr);
const USHORT offset = request->req_blr - request->req_base;
request->add_word(0);
if (request->req_flags & REQ_blr_version4)
request->add_byte(blr_version4);
else
request->add_byte(blr_version5);
// for ON UPDATE TRIGGER only: generate the trigger firing condition:
// if prim_key.old_value != prim_key.new value.
// Note that the key could consist of multiple columns
if (on_upd_trg) {
create_trg_firing_cond(request, constraint);
request->add_byte(blr_begin);
request->add_byte(blr_begin);
}
request->add_byte(blr_for);
request->add_byte(blr_rse);
// the context for the prim. key relation
request->add_byte(1);
request->add_byte(blr_relation);
put_cstring(request, 0, relation->rel_symbol->sym_string);
// the context for the foreign key relation
request->add_byte(2);
create_matching_blr(request, constraint);
request->add_byte(blr_modify);
request->add_byte((SSHORT) 2);
request->add_byte((SSHORT) 2);
request->add_byte(blr_begin);
for (; for_key_fld; for_key_fld = for_key_fld->lls_next) {
// for every column in the foreign key ....
const str* for_key_fld_name = (STR) for_key_fld->lls_object;
request->add_byte(blr_assignment);
/* here stuff the default value as blr_literal .... or blr_null
if this column does not have an applicable default */
/* the default is determined in many cases:
(1) The default-info for the column is in memory. (This is because
the column is being created in this application)
(1-a) the table has a column level default. We get this by
searching both current ddl statement and requests
linked list.
(1-b) the table does not have a column level default, but
has a domain default. We get this by searching
requests linked list.
(2) The default-info for the column is not in memory.
We get the column and/or domain default value from the system
tables by calling MET_get_column_default/MET_get_domain_defult */
bool search_for_default = true;
bool search_for_column = false;
const TEXT* search_for_domain = NULL;
// Is the column being created in this ddl statement?
gpre_fld* field;
for (field = relation->rel_fields; field; field = field->fld_next) {
if (strcmp(field->fld_symbol->sym_string,
for_key_fld_name->str_string) == 0)
{
break;
}
}
if (field) {
// Yes. The column is being created in this ddl statement
if (field->fld_default_value) {
// (1-a)
CME_expr(field->fld_default_value, request);
search_for_default = false;
}
else {
// check for domain default
if (field->fld_global) {
// could be either (1-b) or (2)
search_for_domain = field->fld_global->sym_string;
}
else {
request->add_byte(blr_null);
search_for_default = false;
}
}
}
else {
// Nop. The column is not being created in this ddl statement
if (request->req_actions->act_type == ACT_create_table) {
sprintf(s, "field \"%s\" does not exist in relation \"%s\"",
for_key_fld_name->str_string, relation->rel_symbol->sym_string);
CPR_error(s);
}
// Thus we have an ALTER TABLE statement.
// If somebody is 'clever' enough to create table and then to alter it
// within the same application ...
for (req = gpreGlob.requests; req; req = req->req_next) {
if ((req->req_type == REQ_ddl) &&
(request_action = req->req_actions) &&
(request_action->act_type == ACT_create_table ||
request_action->act_type == ACT_alter_table) &&
(rel = (gpre_rel*) request_action->act_object) &&
(strcmp(rel->rel_symbol->sym_string,
relation->rel_symbol->sym_string) == 0))
{
// ... then try to check for the default in memory
gpre_fld* fld;
for (fld = (gpre_fld*) rel->rel_fields;
fld; fld = fld->fld_next)
{
if (strcmp(fld->fld_symbol->sym_string,
for_key_fld_name->str_string) != 0)
continue;
if (fld->fld_default_value) {
// case (1-a):
CME_expr(fld->fld_default_value, request);
search_for_default = false;
}
else {
if (fld->fld_global) {
search_for_domain = fld->fld_global->sym_string;
}
else {
// default not found
request->add_byte(blr_null);
search_for_default = false;
}
}
break;
}
if (fld)
break;
}
}
if (!req)
search_for_column = true;
}
if (search_for_default && search_for_domain != NULL) {
// search for domain level default
fb_assert(search_for_column == false);
// search for domain in memory
for (req = gpreGlob.requests; req; req = req->req_next) {
gpre_fld* domain;
if ((req->req_type == REQ_ddl) &&
(request_action = req->req_actions) &&
((request_action->act_type == ACT_create_domain) ||
(request_action->act_type == ACT_alter_domain)) &&
(domain = (gpre_fld*) request_action->act_object) &&
(strcmp(search_for_domain,
domain->fld_symbol->sym_string) == 0) &&
(domain->fld_default_value->nod_type != nod_erase))
{
// domain found in memory
if (domain->fld_default_value) {
// case (1-b)
CME_expr(domain->fld_default_value, request);
}
else {
// default not found
request->add_byte(blr_null);
}
search_for_default = false;
break;
}
}
if (search_for_default) {
// search for domain in db system tables
if (MET_get_domain_default(relation->rel_database,
search_for_domain,
default_val, sizeof(default_val)))
{
create_default_blr(request, default_val,
sizeof(default_val));
}
else {
request->add_byte(blr_null);
}
search_for_default = false;
}
} // end of search for domain level default
if (search_for_default && search_for_column) {
// nothing is found in memory, try to check db system tables
fb_assert(search_for_domain == NULL);
if (MET_get_column_default(relation, for_key_fld_name->str_string,
default_val,
sizeof(default_val)) != FALSE)
{
create_default_blr(request, default_val, sizeof(default_val));
}
else {
request->add_byte(blr_null);
}
}
// the context for the foreign key relation
request->add_byte(blr_field);
request->add_byte((SSHORT) 2);
put_cstring(request, 0, for_key_fld_name->str_string);
}
request->add_byte(blr_end);
if (on_upd_trg) {
request->add_byte(blr_end);
request->add_byte(blr_end);
request->add_byte(blr_end);
}
request->add_byte(blr_eoc);
const USHORT length = request->req_blr - request->req_base - offset - 2;
request->req_base[offset] = (UCHAR) length;
request->req_base[offset + 1] = (UCHAR) (length >> 8);
// end of the blr
// no trg_source and no trg_description
request->add_byte(isc_dyn_end);
}
//____________________________________________________________
//
// Generate dyn for "on delete|update set null" trigger (for
// referential integrity). The trigger blr is the same for
// both the delete and update cases. Only differences is its
// TRIGGER_TYPE (ON DELETE or ON UPDATE).
// The non_upd_trg parameter == true is an update trigger.
//
static void create_set_null_trg(gpre_req* request,
const act* action,
cnstrt* constraint,
bool on_upd_trg)
{
gpre_lls* for_key_fld = constraint->cnstrt_fields;
const gpre_rel* relation = (gpre_rel*) action->act_object;
// no trigger name. It is generated by the engine
put_string(request, isc_dyn_def_trigger, "", (USHORT) 0);
put_numeric(request, isc_dyn_trg_type,
(SSHORT) (on_upd_trg ? POST_MODIFY_TRIGGER :
POST_ERASE_TRIGGER));
request->add_byte(isc_dyn_sql_object);
put_numeric(request, isc_dyn_trg_sequence, (SSHORT) 1);
put_numeric(request, isc_dyn_trg_inactive, (SSHORT) 0);
put_cstring(request, isc_dyn_rel_name,
constraint->cnstrt_referred_rel->str_string);
// the trigger blr
request->add_byte(isc_dyn_trg_blr);
const USHORT offset = request->req_blr - request->req_base;
request->add_word(0);
if (request->req_flags & REQ_blr_version4)
request->add_byte(blr_version4);
else
request->add_byte(blr_version5);
// for ON UPDATE TRIGGER only: generate the trigger firing condition:
// if prim_key.old_value != prim_key.new value.
// Note that the key could consist of multiple columns
if (on_upd_trg) {
create_trg_firing_cond(request, constraint);
request->add_byte(blr_begin);
request->add_byte(blr_begin);
}
request->add_byte(blr_for);
request->add_byte(blr_rse);
// the context for the prim. key relation
request->add_byte(1);
request->add_byte(blr_relation);
put_cstring(request, 0, relation->rel_symbol->sym_string);
// the context for the foreign key relation
request->add_byte(2);
create_matching_blr(request, constraint);
request->add_byte(blr_modify);
request->add_byte((SSHORT) 2);
request->add_byte((SSHORT) 2);
request->add_byte(blr_begin);
for (; for_key_fld; for_key_fld = for_key_fld->lls_next) {
const str* for_key_fld_name = (STR) for_key_fld->lls_object;
request->add_byte(blr_assignment);
request->add_byte(blr_null);
request->add_byte(blr_field);
request->add_byte((SSHORT) 2);
put_cstring(request, 0, for_key_fld_name->str_string);
}
request->add_byte(blr_end);
if (on_upd_trg) {
request->add_byte(blr_end);
request->add_byte(blr_end);
request->add_byte(blr_end);
}
request->add_byte(blr_eoc);
const USHORT length = request->req_blr - request->req_base - offset - 2;
request->req_base[offset] = (UCHAR) length;
request->req_base[offset + 1] = (UCHAR) (length >> 8);
// end of the blr
// no trg_source and no trg_description
request->add_byte(isc_dyn_end);
}
//____________________________________________________________
//
// Get referred fields from memory/system tables
//
static void get_referred_fields(const act* action, cnstrt* constraint)
{
TEXT s[512];
const gpre_rel* relation = (gpre_rel*) action->act_object;
for (gpre_req* req = gpreGlob.requests; req; req = req->req_next) {
const act* request_action;
const gpre_rel* rel;
if ((req->req_type == REQ_ddl) &&
(request_action = req->req_actions) &&
(request_action->act_type == ACT_create_table ||
request_action->act_type == ACT_alter_table) &&
(rel = (gpre_rel*) request_action->act_object) &&
(strcmp(rel->rel_symbol->sym_string,
constraint->cnstrt_referred_rel->str_string) == 0))
{
for (const cnstrt* cns = rel->rel_constraints; cns;
cns = cns->cnstrt_next)
{
if (cns->cnstrt_type == CNSTRT_PRIMARY_KEY) {
constraint->cnstrt_referred_fields = cns->cnstrt_fields;
break;
}
}
if (!constraint->cnstrt_referred_fields && rel->rel_fields)
for (const cnstrt* cns = rel->rel_fields->fld_constraints; cns;
cns = cns->cnstrt_next)
{
if (cns->cnstrt_type == CNSTRT_PRIMARY_KEY) {
constraint->cnstrt_referred_fields = cns->cnstrt_fields;
break;
}
}
if (constraint->cnstrt_referred_fields)
break;
}
}
if (constraint->cnstrt_referred_fields == NULL)
// Nothing is in memory. Try to find in system tables
constraint->cnstrt_referred_fields =
MET_get_primary_key(relation->rel_database,
constraint->cnstrt_referred_rel->str_string);
if (constraint->cnstrt_referred_fields == NULL) {
// Nothing is in system tables.
sprintf(s,
"\"REFERENCES %s\" without \"(column list)\" requires PRIMARY KEY on referenced table",
constraint->cnstrt_referred_rel->str_string);
CPR_error(s);
}
else {
// count both primary key and foreign key columns
USHORT prim_key_num_flds = 0, for_key_num_flds = 0;
const gpre_lls* field = constraint->cnstrt_referred_fields;
while (field) {
prim_key_num_flds++;
field = field->lls_next;
}
field = constraint->cnstrt_fields;
while (field) {
for_key_num_flds++;
field = field->lls_next;
}
if (prim_key_num_flds != for_key_num_flds) {
sprintf(s,
"PRIMARY KEY column count in relation \"%s\" does not match FOREIGN KEY in relation \"%s\"",
constraint->cnstrt_referred_rel->str_string,
relation->rel_symbol->sym_string);
CPR_error(s);
}
}
}
//____________________________________________________________
//
// Generate dyn for creating a constraint.
//
static void create_constraint( gpre_req* request, const act* action,
cnstrt* constraint)
{
for (; constraint; constraint = constraint->cnstrt_next) {
if (constraint->cnstrt_flags & CNSTRT_delete)
continue;
put_cstring(request, isc_dyn_rel_constraint,
constraint->cnstrt_name->str_string);
switch (constraint->cnstrt_type)
{
case CNSTRT_PRIMARY_KEY:
request->add_byte(isc_dyn_def_primary_key);
break;
case CNSTRT_UNIQUE:
request->add_byte(isc_dyn_def_unique);
break;
case CNSTRT_FOREIGN_KEY:
request->add_byte(isc_dyn_def_foreign_key);
break;
case CNSTRT_NOT_NULL:
request->add_byte(isc_dyn_fld_not_null);
request->add_end();
continue;
case CNSTRT_CHECK:
create_check_constraint(request, action, constraint);
request->add_end();
continue;
default:
fb_assert(false);
}
// stuff a zero-length name, indicating that an index
// name should be generated
request->add_word(0);
if (constraint->cnstrt_type == CNSTRT_FOREIGN_KEY) {
// If <referenced column list> is not specified try to catch
// them right here
if (constraint->cnstrt_referred_fields == NULL)
get_referred_fields(action, constraint);
if (constraint->cnstrt_fkey_def_type & REF_UPDATE_ACTION) {
request->add_byte(isc_dyn_foreign_key_update);
switch (constraint->cnstrt_fkey_def_type & REF_UPDATE_MASK) {
case REF_UPD_NONE:
request->add_byte(isc_dyn_foreign_key_none);
break;
case REF_UPD_CASCADE:
request->add_byte(isc_dyn_foreign_key_cascade);
create_upd_cascade_trg(request, action, constraint);
break;
case REF_UPD_SET_DEFAULT:
request->add_byte(isc_dyn_foreign_key_default);
create_set_default_trg(request, action, constraint, true);
break;
case REF_UPD_SET_NULL:
request->add_byte(isc_dyn_foreign_key_null);
create_set_null_trg(request, action, constraint, true);
break;
default:
// just in case
fb_assert(0);
request->add_byte(isc_dyn_foreign_key_none);
break;
}
}
if (constraint->cnstrt_fkey_def_type & REF_DELETE_ACTION) {
request->add_byte(isc_dyn_foreign_key_delete);
switch (constraint->cnstrt_fkey_def_type & REF_DELETE_MASK) {
case REF_DEL_NONE:
request->add_byte(isc_dyn_foreign_key_none);
break;
case REF_DEL_CASCADE:
request->add_byte(isc_dyn_foreign_key_cascade);
create_del_cascade_trg(request, action, constraint);
break;
case REF_DEL_SET_DEFAULT:
request->add_byte(isc_dyn_foreign_key_default);
create_set_default_trg(request, action, constraint, false);
break;
case REF_DEL_SET_NULL:
request->add_byte(isc_dyn_foreign_key_null);
create_set_null_trg(request, action, constraint, false);
break;
default:
// just in case
fb_assert(0);
request->add_byte(isc_dyn_foreign_key_none);
break;
}
}
}
else
put_numeric(request, isc_dyn_idx_unique, 1);
for (const gpre_lls* field = constraint->cnstrt_fields; field;
field = field->lls_next)
{
const str* string = (STR) field->lls_object;
put_cstring(request, isc_dyn_fld_name, string->str_string);
}
if (constraint->cnstrt_type == CNSTRT_FOREIGN_KEY) {
put_cstring(request, isc_dyn_idx_foreign_key,
constraint->cnstrt_referred_rel->str_string);
for (const gpre_lls* field = constraint->cnstrt_referred_fields; field;
field = field->lls_next)
{
const str* string = (STR) field->lls_object;
put_cstring(request, isc_dyn_idx_ref_column, string->str_string);
}
}
request->add_end();
}
}
//____________________________________________________________
//
// Generate parameter buffer for CREATE DATABASE action.
//
static void create_database( gpre_req* request, const act* action)
{
const dbb* db = ((mdbb*) action->act_object)->mdbb_database;
request->add_byte(isc_dpb_version1);
request->add_byte(isc_dpb_overwrite);
request->add_byte(1);
request->add_byte(0);
request->add_byte(isc_dpb_sql_dialect);
request->add_byte(sizeof(int));
int def_db_dial = 3;
if ((gpreGlob.dialect_specified) && (gpreGlob.sw_sql_dialect == 1 || gpreGlob.sw_sql_dialect == 3))
def_db_dial = gpreGlob.sw_sql_dialect;
request->add_long(def_db_dial);
if (db->dbb_allocation) {
request->add_byte(isc_dpb_allocation);
request->add_byte(4);
request->add_long(db->dbb_allocation);
}
if (db->dbb_pagesize) {
request->add_byte(isc_dpb_page_size);
request->add_byte(4);
request->add_long(db->dbb_pagesize);
}
if (db->dbb_buffercount) {
request->add_byte(isc_dpb_num_buffers);
request->add_byte(4);
request->add_long(db->dbb_buffercount);
}
if (db->dbb_buffersize) {
request->add_byte(isc_dpb_buffer_length);
request->add_byte(4);
request->add_long(db->dbb_buffersize);
}
if (db->dbb_users) {
request->add_byte(isc_dpb_number_of_users);
request->add_byte(4);
request->add_long(db->dbb_users);
}
SSHORT l;
if (db->dbb_c_user && !db->dbb_r_user) {
request->add_byte(isc_dpb_user_name);
l = strlen(db->dbb_c_user);
request->add_byte(l);
const char* ch = db->dbb_c_user;
while (*ch)
request->add_byte(*ch++);
}
if (db->dbb_c_password && !db->dbb_r_password) {
request->add_byte(isc_dpb_password);
l = strlen(db->dbb_c_password);
request->add_byte(l);
const char* ch = db->dbb_c_password;
while (*ch)
request->add_byte(*ch++);
}
*request->req_blr = 0;
request->req_length = request->req_blr - request->req_base;
if (request->req_length == 1)
request->req_length = 0;
request->req_blr = request->req_base;
}
//____________________________________________________________
//
// Generate dynamic DDL for second stage of create database
//
static void create_database_modify_dyn( gpre_req* request, act* action)
{
dbb* db = ((mdbb*) action->act_object)->mdbb_database;
request->add_byte(isc_dyn_mod_database);
// Reverse the order of files (parser left them backwards)
FIL files = db->dbb_files;
FIL file, next;
for (file = files, files = NULL; file; file = next) {
next = file->fil_next;
file->fil_next = files;
files = file;
}
SLONG start = db->dbb_length;
for (file = files; file != NULL; file = file->fil_next) {
put_cstring(request, isc_dyn_def_file, file->fil_name);
request->add_byte(isc_dyn_file_start);
request->add_word(4);
start = MAX(start, file->fil_start);
request->add_long(start);
request->add_byte(isc_dyn_file_length);
request->add_word(4);
request->add_long(file->fil_length);
request->add_end();
start += file->fil_length;
}
/*
if (db->dbb_cache_file)
add_cache(request, action, db);
*/
if (db->dbb_def_charset)
put_cstring(request, isc_dyn_fld_character_set_name,
db->dbb_def_charset);
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for CREATE DOMAIN action.
//
static void create_domain( gpre_req* request, const act* action)
{
const gpre_fld* field = (gpre_fld*) action->act_object;
// add field info
put_symbol(request, isc_dyn_def_global_fld, field->fld_symbol);
put_field_attributes(request, field);
if (field->fld_default_value) {
put_blr(request, isc_dyn_fld_default_value, field->fld_default_value,
CME_expr);
TEXT* default_source = (TEXT*)
MSC_alloc(field->fld_default_source->txt_length + 1);
CPR_get_text(default_source, field->fld_default_source);
put_cstring(request, isc_dyn_fld_default_source, default_source);
}
if (field->fld_constraints)
create_domain_constraint(request, action, field->fld_constraints);
request->add_end();
}
//____________________________________________________________
//
// Generate dyn for creating a constraints for domains.
//
static void create_domain_constraint(gpre_req* request, const act* action,
const cnstrt* constraint)
{
for (; constraint; constraint = constraint->cnstrt_next) {
if (constraint->cnstrt_flags & CNSTRT_delete)
continue;
// **** this will be used later
// put_cstring (request, isc_dyn_rel_constraint, constraint->cnstrt_name->str_string);
//***
if (constraint->cnstrt_type == CNSTRT_CHECK) {
TEXT* source = (TEXT*) MSC_alloc(constraint->cnstrt_text->txt_length + 1);
CPR_get_text(source, constraint->cnstrt_text);
if (source != NULL)
put_cstring(request, isc_dyn_fld_validation_source, source);
put_blr(request, isc_dyn_fld_validation_blr,
constraint->cnstrt_boolean, CME_expr);
}
}
}
//____________________________________________________________
//
// Generate dynamic DDL for creating a generator.
//
static void create_generator( gpre_req* request, const act* action)
{
const TEXT* generator_name = (TEXT*) action->act_object;
put_cstring(request, isc_dyn_def_generator, generator_name);
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for CREATE INDEX action.
//
static void create_index( gpre_req* request, const ind* index)
{
if (index->ind_symbol)
put_symbol(request, isc_dyn_def_idx, index->ind_symbol);
else {
// An index created because of the UNIQUE constraint on this field.
put_cstring(request, isc_dyn_def_idx, "");
}
put_symbol(request, isc_dyn_rel_name, index->ind_relation->rel_symbol);
if (index->ind_flags & IND_dup_flag)
put_numeric(request, isc_dyn_idx_unique, 1);
if (index->ind_flags & IND_descend)
put_numeric(request, isc_dyn_idx_type, 1);
if (index->ind_symbol) {
for (const gpre_fld* field = index->ind_fields; field;
field = field->fld_next)
{
put_symbol(request, isc_dyn_fld_name, field->fld_symbol);
}
}
else {
// An index created on this one field because of the
// UNIQUE constraint on this field.
put_symbol(request, isc_dyn_fld_name, index->ind_fields->fld_symbol);
}
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for creating a shadow
//
static void create_shadow( gpre_req* request, act* action)
{
fil* files = (FIL) action->act_object;
// Reverse the order of files (parser left them backwards)
FIL file, next;
for (file = files, files = NULL; file; file = next) {
next = file->fil_next;
file->fil_next = files;
files = file;
}
put_numeric(request, isc_dyn_def_shadow,
(SSHORT) files->fil_shadow_number);
for (file = files; file != NULL; file = file->fil_next) {
put_cstring(request, isc_dyn_def_file, file->fil_name);
request->add_byte(isc_dyn_file_start);
request->add_word(4);
const SLONG start = file->fil_start;
request->add_long(start);
request->add_byte(isc_dyn_file_length);
request->add_word(4);
request->add_long(file->fil_length);
if (file->fil_flags & FIL_manual)
put_numeric(request, isc_dyn_shadow_man_auto, 1);
if (file->fil_flags & FIL_conditional)
put_numeric(request, isc_dyn_shadow_conditional, 1);
request->add_end();
}
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for CREATE TABLE action.
//
static void create_table( gpre_req* request, const act* action)
{
// add relation name
const gpre_rel* relation = (gpre_rel*) action->act_object;
put_symbol(request, isc_dyn_def_rel, relation->rel_symbol);
// If the relation is defined as an external file, add dyn for that
if (relation->rel_ext_file)
put_cstring(request, isc_dyn_rel_ext_file, relation->rel_ext_file);
put_numeric(request, isc_dyn_rel_sql_protection, 1);
// add field info
const gpre_fld* field;
USHORT position = 0;
for (field = relation->rel_fields; field; field = field->fld_next) {
if (field->fld_global) {
put_symbol(request, isc_dyn_def_local_fld, field->fld_symbol);
put_symbol(request, isc_dyn_fld_source, field->fld_global);
}
else
put_symbol(request, isc_dyn_def_sql_fld, field->fld_symbol);
put_field_attributes(request, field);
put_numeric(request, isc_dyn_fld_position, position++);
if (field->fld_default_value) {
put_blr(request, isc_dyn_fld_default_value,
field->fld_default_value, CME_expr);
TEXT* default_source = (TEXT*)
MSC_alloc(field->fld_default_source->txt_length + 1);
CPR_get_text(default_source, field->fld_default_source);
put_cstring(request, isc_dyn_fld_default_source, default_source);
}
request->add_end();
if (field->fld_constraints)
create_constraint(request, action, field->fld_constraints);
}
if (relation->rel_constraints)
create_constraint(request, action, relation->rel_constraints);
request->add_end();
// Need to create an index for any fields (columns) declared with
// the UNIQUE constraint.
for (field = relation->rel_fields; field; field = field->fld_next)
if (field->fld_index)
create_index(request, field->fld_index);
}
//____________________________________________________________
//
// Generate dynamic DDL for a trigger.
//
static void create_trigger(gpre_req* request,
const act* action,
gpre_trg* trigger, pfn_local_trigger_cb routine)
{
const gpre_rel* relation = (gpre_rel*) action->act_object;
// Name of trigger to be generated
put_cstring(request, isc_dyn_def_trigger, "");
put_symbol(request, isc_dyn_rel_name, relation->rel_symbol);
put_numeric(request, isc_dyn_trg_type, trigger->trg_type);
put_numeric(request, isc_dyn_trg_sequence, 0);
put_numeric(request, isc_dyn_trg_inactive, 0);
request->add_byte(isc_dyn_sql_object);
if (trigger->trg_source != NULL)
put_cstring(request, isc_dyn_trg_source,
trigger->trg_source->str_string);
if (trigger->trg_message != NULL) {
put_numeric(request, isc_dyn_def_trigger_msg, 1);
put_cstring(request, isc_dyn_trg_msg, trigger->trg_message->str_string);
request->add_byte(isc_dyn_end);
}
// Generate the BLR for firing the trigger
put_trigger_blr(request, isc_dyn_trg_blr, trigger->trg_boolean, routine);
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for CREATE VIEW action.
//
static bool create_view(gpre_req* request,
act* action)
{
// add relation name
gpre_rel* relation = (gpre_rel*) action->act_object;
put_symbol(request, isc_dyn_def_view, relation->rel_symbol);
put_numeric(request, isc_dyn_rel_sql_protection, 1);
// write out blr
put_blr(request, isc_dyn_view_blr, (GPRE_NOD) relation->rel_view_rse,
reinterpret_cast<pfn_local_trigger_cb>(CME_rse));
// write out view source
TEXT* view_source = (TEXT *) MSC_alloc(relation->rel_view_text->txt_length + 1);
CPR_get_text(view_source, relation->rel_view_text);
put_cstring(request, isc_dyn_view_source, view_source);
// Write out view context info
gpre_rel* sub_relation = 0;
gpre_ctx* context;
for (context = request->req_contexts; context;
context = context->ctx_next)
{
sub_relation = context->ctx_relation;
if (!sub_relation)
continue;
put_symbol(request, isc_dyn_view_relation, sub_relation->rel_symbol);
put_numeric(request, isc_dyn_view_context, context->ctx_internal);
if (context->ctx_symbol)
put_symbol(request, isc_dyn_view_context_name,
context->ctx_symbol);
request->add_end();
}
// add the mapping from the rse to the view fields
gpre_fld* field = relation->rel_fields;
gpre_nod* fields = relation->rel_view_rse->rse_fields;
SSHORT position = 0;
bool non_updateable = false;
gpre_nod** ptr;
const gpre_nod* const* end;
for (ptr = fields->nod_arg, end = ptr + fields->nod_count; ptr < end;
ptr++, field = (field) ? field->fld_next : NULL)
{
const gpre_fld* fld = NULL;
gpre_nod* value = *ptr;
if (value->nod_type == nod_field) {
const ref* reference = (REF) value->nod_arg[0];
fld = reference->ref_field;
const gpre_req* slice_req;
const slc* slice;
if ((value->nod_count >= 2)
&& (slice_req = (gpre_req*) value->nod_arg[2])
&& (slice = slice_req->req_slice))
{
CPR_error("Array slices not supported in views");
}
context = reference->ref_context;
}
const gpre_sym* symbol;
if (field)
symbol = field->fld_symbol;
else if (fld)
symbol = fld->fld_symbol;
else {
request->req_length = 0;
CPR_error("view expression requires field name");
return false;
}
if (fld) {
put_symbol(request, isc_dyn_def_local_fld, symbol);
put_symbol(request, isc_dyn_fld_base_fld, fld->fld_symbol);
put_numeric(request, isc_dyn_view_context, context->ctx_internal);
}
else {
non_updateable = true;
put_symbol(request, isc_dyn_def_sql_fld, symbol);
put_blr(request, isc_dyn_fld_computed_blr, value, CME_expr);
gpre_fld tmp_field;
init_field_struct(&tmp_field);
CME_get_dtype(value, &tmp_field);
put_dtype(request, &tmp_field);
}
put_numeric(request, isc_dyn_fld_position, position++);
request->add_end();
}
if (relation->rel_flags & REL_view_check) { // VIEW WITH CHECK OPTION
// Make sure VIEW is updateable
gpre_rse* select = relation->rel_view_rse;
if ((select->rse_aggregate) ||
(non_updateable) || (select->rse_count != 1)) {
CPR_error("Invalid view WITH CHECK OPTION - non-updateable view");
return false;
}
if (!select->rse_boolean) {
CPR_error("Invalid view WITH CHECK OPTION - no WHERE clause");
return false;
}
gpre_trg* trigger = (gpre_trg*) MSC_alloc(TRG_LEN);
// For the triggers, the OLD, NEW contexts are reserved
request->req_internal = 0;
request->req_contexts = 0;
gpre_ctx* contexts[3];
// Make the OLD context for the trigger
contexts[0] = request->req_contexts = context = MSC_context(request);
context->ctx_relation = relation;
// Make the NEW context for the trigger
contexts[1] = request->req_contexts = context = MSC_context(request);
context->ctx_relation = relation;
// Make the context for the base relation
contexts[2] = select->rse_context[0] = request->req_contexts =
context = MSC_context(request);
context->ctx_relation = sub_relation;
// Make lists to assign from NEW fields to fields in the base relation.
/* Also make sure rows in base relation correspond to rows in VIEW by
making sure values in fields inherited by the VIEW are same as
values in base relation. */
field = relation->rel_fields;
fields = relation->rel_view_rse->rse_fields;
gpre_nod* and_nod = 0;
gpre_nod* or_node = 0;
SSHORT count = 0;
gpre_lls* stack = NULL;
for (ptr = fields->nod_arg, end = ptr + fields->nod_count; ptr < end;
ptr++, field = (field) ? field->fld_next : NULL)
{
gpre_fld* fld = NULL;
gpre_nod* value = *ptr;
if (value->nod_type == nod_field) {
ref* reference = (REF) value->nod_arg[0];
reference->ref_context = contexts[2];
fld = reference->ref_field;
}
ref* view_ref = MSC_reference(0);
view_ref->ref_context = contexts[0];
ref* new_view_ref = MSC_reference(0);
new_view_ref->ref_context = contexts[1];
new_view_ref->ref_field = view_ref->ref_field =
(field) ? field : fld;
gpre_nod* view_field = MSC_unary(nod_field, (GPRE_NOD) view_ref);
gpre_nod* new_view_field = MSC_unary(nod_field, (GPRE_NOD) new_view_ref);
gpre_nod* anull_node = MSC_unary(nod_missing, view_field);
gpre_nod* bnull_node = MSC_unary(nod_missing, value);
gpre_nod* iand_node = MSC_binary(nod_and, anull_node, bnull_node);
gpre_nod* eq_nod = MSC_binary(nod_eq, view_field, value);
or_node = MSC_binary(nod_or, eq_nod, iand_node);
gpre_nod* set_item = MSC_node(nod_assignment, 2);
set_item->nod_arg[1] = value;
set_item->nod_arg[0] = new_view_field;
MSC_push(set_item, &stack);
count++;
if (!or_node)
or_node = MSC_binary(nod_or, eq_nod, iand_node);
else if (!and_nod)
and_nod = MSC_binary(nod_and, or_node,
MSC_binary(nod_or, eq_nod, iand_node));
else
and_nod = MSC_binary(nod_and, and_nod,
MSC_binary(nod_or, eq_nod, iand_node));
}
gpre_nod* set_list = MSC_node(nod_list, count);
ptr = set_list->nod_arg + count;
while (stack)
*--ptr = (GPRE_NOD) MSC_pop(&stack);
// Modify the context of fields in boolean to be that of the
// sub-relation.
replace_field_names(select->rse_boolean, 0, 0, false, contexts);
gpre_nod* view_boolean = select->rse_boolean;
select->rse_boolean =
MSC_binary(nod_and, (and_nod) ? and_nod : or_node,
select->rse_boolean);
// create the UPDATE trigger
trigger->trg_type = PRE_MODIFY_TRIGGER;
// "update violates CHECK constraint on view"
trigger->trg_message = NULL;
trigger->trg_boolean = (GPRE_NOD) select;
create_view_trigger(request, action, trigger, view_boolean, contexts,
set_list);
// create the Pre-store trigger
trigger->trg_type = PRE_STORE_TRIGGER;
// "insert violates CHECK constraint on view"
create_view_trigger(request, action, trigger, view_boolean, contexts,
set_list);
}
request->add_end();
return true;
}
//____________________________________________________________
//
// Generate dynamic DDL for a trigger.
//
static void create_view_trigger(gpre_req* request,
const act* action,
gpre_trg* trigger,
gpre_nod* view_boolean,
gpre_ctx** contexts, GPRE_NOD set_list)
{
const gpre_rel* relation = (gpre_rel*) action->act_object;
// Name of trigger to be generated
put_cstring(request, isc_dyn_def_trigger, "");
put_symbol(request, isc_dyn_rel_name, relation->rel_symbol);
put_numeric(request, isc_dyn_trg_type, trigger->trg_type);
put_numeric(request, isc_dyn_trg_sequence, 0);
request->add_byte(isc_dyn_sql_object);
if (trigger->trg_source != NULL)
put_cstring(request, isc_dyn_trg_source,
trigger->trg_source->str_string);
if (trigger->trg_message != NULL) {
put_numeric(request, isc_dyn_def_trigger_msg, 1);
put_cstring(request, isc_dyn_trg_msg, trigger->trg_message->str_string);
request->add_byte(isc_dyn_end);
}
// Generate the BLR for firing the trigger
put_view_trigger_blr(request, relation, isc_dyn_trg_blr, trigger,
view_boolean, contexts, set_list);
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for DECLARE FILTER action.
//
static void declare_filter( gpre_req* request, const act* action)
{
const fltr* filter = (FLTR) action->act_object;
put_cstring(request, isc_dyn_def_filter, filter->fltr_name);
put_numeric(request, isc_dyn_filter_in_subtype, filter->fltr_input_type);
put_numeric(request, isc_dyn_filter_out_subtype,
filter->fltr_output_type);
put_cstring(request, isc_dyn_func_entry_point, filter->fltr_entry_point);
put_cstring(request, isc_dyn_func_module_name, filter->fltr_module_name);
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for DECLARE EXTERNAL
//
static void declare_udf( gpre_req* request, const act* action)
{
const decl_udf* udf_declaration = (decl_udf*) action->act_object;
const TEXT* udf_name = udf_declaration->decl_udf_name;
put_cstring(request, isc_dyn_def_function, udf_name);
put_cstring(request, isc_dyn_func_entry_point, udf_declaration->decl_udf_entry_point);
put_cstring(request, isc_dyn_func_module_name, udf_declaration->decl_udf_module_name);
// Reverse the order of arguments which parse left backwords.
//
//for (field = udf_declaration->decl_udf_arg_list, udf_declaration->decl_udf_arg_list = NULL; field; field = next)
// {
// next = field->fld_next;
// field->fld_next = udf_declaration->decl_udf_arg_list;
// udf_declaration->decl_udf_arg_list = field;
// }
//
SSHORT position, blob_position = 0;
const gpre_fld* field = udf_declaration->decl_udf_return_type;
if (field) {
// Function returns a value
// Some data types can not be returned as value
if ((udf_declaration->decl_udf_return_mode == FUN_value) &&
(field->fld_dtype == dtype_text ||
field->fld_dtype == dtype_varying ||
field->fld_dtype == dtype_cstring ||
field->fld_dtype == dtype_blob ||
field->fld_dtype == dtype_timestamp))
{
CPR_error
("return mode by value not allowed for this data type");
}
// For functions returning a blob, coerce return argument position to
// be the last parameter.
if (field->fld_dtype == dtype_blob) {
blob_position = 1;
for (const gpre_fld* next = udf_declaration->decl_udf_arg_list;
next; next = next->fld_next)
{
++blob_position;
}
put_numeric(request, isc_dyn_func_return_argument, blob_position);
}
else
put_numeric(request, isc_dyn_func_return_argument, 0);
position = 0;
}
else {
position = 1;
// Function modifies an argument whose value is the function return value
put_numeric(request, isc_dyn_func_return_argument,
udf_declaration->decl_udf_return_parameter);
}
// Now define all the arguments
if (!position) {
if (field->fld_dtype == dtype_blob) {
put_numeric(request, isc_dyn_def_function_arg, blob_position);
put_numeric(request, isc_dyn_func_mechanism, FUN_blob_struct);
}
else {
put_numeric(request, isc_dyn_def_function_arg, 0);
put_numeric(request, isc_dyn_func_mechanism,
udf_declaration->decl_udf_return_mode);
}
put_cstring(request, isc_dyn_function_name, udf_name);
put_dtype(request, field);
request->add_byte(isc_dyn_end);
position = 1;
}
for (field = udf_declaration->decl_udf_arg_list; field; field = field->fld_next) {
if (position > 10)
CPR_error
("External functions can not have more than 10 parameters");
put_numeric(request, isc_dyn_def_function_arg, position++);
if (field->fld_dtype == dtype_blob)
put_numeric(request, isc_dyn_func_mechanism, FUN_blob_struct);
else
put_numeric(request, isc_dyn_func_mechanism, FUN_reference);
put_cstring(request, isc_dyn_function_name, udf_name);
put_dtype(request, field);
request->add_byte(isc_dyn_end);
}
request->add_end();
}
//____________________________________________________________
//
// Generate dynamic DDL for GRANT or
// REVOKE privileges action.
//
static void grant_revoke_privileges( gpre_req* request, const act* action)
{
TEXT privileges[7];
TEXT* p = privileges;
const prv* priv_block = (PRV) action->act_object;
if (priv_block->prv_privileges & PRV_select)
*p++ = 'S';
if (priv_block->prv_privileges & PRV_insert)
*p++ = 'I';
if (priv_block->prv_privileges & PRV_delete)
*p++ = 'D';
if (priv_block->prv_privileges & PRV_execute)
*p++ = 'X';
if (priv_block->prv_privileges & PRV_all)
*p++ = 'A';
if (priv_block->prv_privileges & PRV_references)
*p++ = 'R';
*p = 0;
// If there are any select, insert, or delete privileges to be granted
// or revoked output the necessary DYN strings
if (p != privileges)
for (priv_block = (PRV) action->act_object; priv_block;
priv_block = priv_block->prv_next)
{
if (action->act_type == ACT_dyn_grant)
put_cstring(request, isc_dyn_grant, privileges);
else // action = ACT_dyn_revoke
put_cstring(request, isc_dyn_revoke, privileges);
put_cstring(request, priv_block->prv_object_dyn,
priv_block->prv_relation->str_string);
put_cstring(request, priv_block->prv_user_dyn,
priv_block->prv_username);
if ((priv_block->prv_privileges & PRV_grant_option) &&
((action->act_type == ACT_dyn_grant) ||
!(request->req_database->dbb_flags & DBB_v3)))
{
put_numeric(request, isc_dyn_grant_options, 1);
}
request->add_end();
}
// If there are no UPDATE privileges to be granted or revoked, we've finished
if (!(((PRV) action->act_object)->prv_privileges & PRV_update))
return;
p = privileges;
*p++ = 'U';
*p = 0;
for (priv_block = (PRV) action->act_object; priv_block;
priv_block = priv_block->prv_next)
{
if (priv_block->prv_fields) {
for (const gpre_lls* field = priv_block->prv_fields; field;
field = field->lls_next)
{
if (action->act_type == ACT_dyn_grant)
put_cstring(request, isc_dyn_grant, privileges);
else // action->act_type == ACT_dyn_revoke
put_cstring(request, isc_dyn_revoke, privileges);
put_cstring(request, priv_block->prv_object_dyn,
priv_block->prv_relation->str_string);
const str* string = (STR) field->lls_object;
put_cstring(request, isc_dyn_fld_name, string->str_string);
put_cstring(request, priv_block->prv_user_dyn,
priv_block->prv_username);
if ((priv_block->prv_privileges & PRV_grant_option) &&
((action->act_type == ACT_dyn_grant) ||
!(request->req_database->dbb_flags & DBB_v3)))
{
put_numeric(request, isc_dyn_grant_options, 1);
}
request->add_end();
}
}
else { // No specific fields mentioned;
// UPDATE privilege granted or revoked on all fields
if (action->act_type == ACT_dyn_grant)
put_cstring(request, isc_dyn_grant, privileges);
else // action->act_type == ACT_dyn_revoke
put_cstring(request, isc_dyn_revoke, privileges);
put_cstring(request, priv_block->prv_object_dyn,
priv_block->prv_relation->str_string);
put_cstring(request, priv_block->prv_user_dyn,
priv_block->prv_username);
if ((priv_block->prv_privileges & PRV_grant_option) &&
((action->act_type == ACT_dyn_grant) ||
!(request->req_database->dbb_flags & DBB_v3)))
{
put_numeric(request, isc_dyn_grant_options, 1);
}
request->add_end();
}
}
}
//____________________________________________________________
//
//
//
static void init_field_struct( gpre_fld* field)
{
field->fld_dtype = 0;
field->fld_length = 0;
field->fld_scale = 0;
field->fld_id = 0;
field->fld_flags = 0;
field->fld_seg_length = 0;
field->fld_position = 0;
field->fld_sub_type = 0;
field->fld_next = 0;
field->fld_array = 0;
field->fld_relation = 0;
field->fld_procedure = 0;
field->fld_symbol = 0;
field->fld_global = 0;
field->fld_array_info = 0;
field->fld_default_value = 0;
field->fld_default_source = 0;
field->fld_index = 0;
field->fld_constraints = 0;
field->fld_character_set = 0;
field->fld_collate = 0;
field->fld_computed = 0;
field->fld_char_length = 0;
field->fld_charset_id = 0;
field->fld_collate_id = 0;
}
//____________________________________________________________
//
// Put dimensions for the array field.
//
static void put_array_info( gpre_req* request, const gpre_fld* field)
{
const ary* array_info = field->fld_array_info;
const SSHORT dims = (SSHORT) array_info->ary_dimension_count;
put_numeric(request, isc_dyn_fld_dimensions, dims);
for (SSHORT i = 0; i < dims; ++i) {
put_numeric(request, isc_dyn_def_dimension, i);
request->add_byte(isc_dyn_dim_lower);
const SLONG lrange = (SLONG) (array_info->ary_rpt[i].ary_lower);
request->add_word(4);
request->add_long(lrange);
request->add_byte(isc_dyn_dim_upper);
const SLONG urange = (SLONG) (array_info->ary_rpt[i].ary_upper);
request->add_word(4);
request->add_long(urange);
request->add_byte(isc_dyn_end);
}
}
//____________________________________________________________
//
// Put an expression expressed in BLR.
//
static void put_blr(gpre_req* request,
USHORT blr_operator, GPRE_NOD node, pfn_local_trigger_cb routine)
{
request->add_byte(blr_operator);
const USHORT offset = request->req_blr - request->req_base;
request->add_word(0);
if (request->req_flags & REQ_blr_version4)
request->add_byte(blr_version4);
else
request->add_byte(blr_version5);
(*routine) (node, request);
request->add_byte(blr_eoc);
const USHORT length = request->req_blr - request->req_base - offset - 2;
request->req_base[offset] = (UCHAR) length;
request->req_base[offset + 1] = (UCHAR) (length >> 8);
}
//____________________________________________________________
//
// Generate dynamic DDL for a computed field.
//
static void put_computed_blr( gpre_req* request, const gpre_fld* field)
{
const act* action = request->req_actions;
const gpre_rel* relation = (gpre_rel*) action->act_object;
// Computed field context has to be 0 - so force it
gpre_ctx* context = request->req_contexts;
const USHORT save_ctx_int = context->ctx_internal;
context->ctx_internal = 0;
request->add_byte(isc_dyn_fld_computed_blr);
const USHORT offset = request->req_blr - request->req_base;
request->add_word(0);
if (request->req_flags & REQ_blr_version4)
request->add_byte(blr_version4);
else
request->add_byte(blr_version5);
CME_expr(field->fld_computed->cmpf_boolean, request);
request->add_byte(blr_eoc);
context->ctx_internal = save_ctx_int;
const USHORT length = request->req_blr - request->req_base - offset - 2;
request->req_base[offset] = (UCHAR) length;
request->req_base[offset + 1] = (UCHAR) (length >> 8);
}
//____________________________________________________________
//
// Generate dynamic DDL for a computed field.
//
static void put_computed_source( gpre_req* request, const gpre_fld* field)
{
const act* action = request->req_actions;
const gpre_rel* relation = (gpre_rel*) action->act_object;
if (field->fld_computed->cmpf_text != NULL) {
TEXT* computed_source = (TEXT*)
MSC_alloc(field->fld_computed->cmpf_text->txt_length + 1);
CPR_get_text(computed_source, field->fld_computed->cmpf_text);
put_cstring(request, isc_dyn_fld_computed_source, computed_source);
}
}
//____________________________________________________________
//
// Put a null-terminated string valued attributed to the output string.
//
static void put_cstring(gpre_req* request, USHORT ddl_operator,
const TEXT* string)
{
USHORT length = 0;
if (string != NULL)
length = strlen(string);
put_string(request, ddl_operator, string, length);
}
//____________________________________________________________
//
// Generate dynamic DDL to create a field for CREATE
// or ALTER TABLE action.
//
static void put_dtype( gpre_req* request, const gpre_fld* field)
{
USHORT dtype;
USHORT length = field->fld_length;
const USHORT precision = field->fld_precision;
const USHORT sub_type = field->fld_sub_type;
switch (field->fld_dtype) {
case dtype_cstring:
// If the user is defining a field as cstring then generate
// blr_cstring. Currently being used only for defining udf's
if (field->fld_flags & FLD_meta_cstring)
dtype = blr_cstring;
else {
// Correct the length of C string for meta data operations
if (gpreGlob.sw_cstring && field->fld_sub_type != dsc_text_type_fixed)
length--;
dtype = blr_text;
}
case dtype_text:
if (field->fld_dtype == dtype_text)
dtype = blr_text;
// Fall into
case dtype_varying:
fb_assert(length);
if (field->fld_dtype == dtype_varying)
dtype = blr_varying;
put_numeric(request, isc_dyn_fld_type, dtype);
put_numeric(request, isc_dyn_fld_length, length);
put_numeric(request, isc_dyn_fld_scale, 0);
if (field->fld_sub_type)
put_numeric(request, isc_dyn_fld_sub_type, field->fld_sub_type);
if (field->fld_char_length)
put_numeric(request, isc_dyn_fld_char_length,
field->fld_char_length);
if (field->fld_collate_id)
put_numeric(request, isc_dyn_fld_collation,
field->fld_collate_id);
if (field->fld_charset_id)
put_numeric(request, isc_dyn_fld_character_set,
field->fld_charset_id);
return;
case dtype_short:
dtype = blr_short;
length = sizeof(SSHORT);
if (gpreGlob.sw_server_version >= 6) {
put_numeric(request, isc_dyn_fld_type, dtype);
put_numeric(request, isc_dyn_fld_length, length);
put_numeric(request, isc_dyn_fld_scale, field->fld_scale);
put_numeric(request, isc_dyn_fld_precision, field->fld_precision);
put_numeric(request, isc_dyn_fld_sub_type, field->fld_sub_type);
return;
}
break;
case dtype_long:
dtype = blr_long;
length = sizeof(SLONG);
if (gpreGlob.sw_server_version >= 6) {
put_numeric(request, isc_dyn_fld_type, dtype);
put_numeric(request, isc_dyn_fld_length, length);
put_numeric(request, isc_dyn_fld_scale, field->fld_scale);
put_numeric(request, isc_dyn_fld_precision, field->fld_precision);
put_numeric(request, isc_dyn_fld_sub_type, field->fld_sub_type);
return;
}
break;
case dtype_blob:
dtype = blr_blob;
length = 8;
put_numeric(request, isc_dyn_fld_type, dtype);
put_numeric(request, isc_dyn_fld_length, length);
put_numeric(request, isc_dyn_fld_scale, 0);
put_numeric(request, isc_dyn_fld_sub_type, field->fld_sub_type);
put_numeric(request, isc_dyn_fld_segment_length,
field->fld_seg_length);
if (field->fld_sub_type == isc_blob_text && field->fld_charset_id)
put_numeric(request, isc_dyn_fld_character_set,
field->fld_charset_id);
return;
case dtype_quad:
dtype = blr_quad;
length = 8;
break;
case dtype_real:
dtype = blr_float;
length = sizeof(float);
break;
case dtype_double:
dtype = blr_double;
length = sizeof(double);
break;
// ** Begin sql date/time/timestamp *
case dtype_sql_date:
dtype = blr_sql_date;
length = sizeof(ISC_DATE);
break;
case dtype_sql_time:
dtype = blr_sql_time;
length = sizeof(ISC_TIME);
break;
case dtype_timestamp:
dtype = blr_timestamp;
length = sizeof(ISC_TIMESTAMP);
break;
// ** End sql date/time/timestamp *
case dtype_int64:
dtype = blr_int64;
length = sizeof(ISC_INT64);
put_numeric(request, isc_dyn_fld_type, dtype);
put_numeric(request, isc_dyn_fld_length, length);
put_numeric(request, isc_dyn_fld_scale, field->fld_scale);
put_numeric(request, isc_dyn_fld_precision, field->fld_precision);
put_numeric(request, isc_dyn_fld_sub_type, field->fld_sub_type);
return;
default:
CPR_bugcheck(" *** Unknown datatype in put_dtype *** ");
break;
}
put_numeric(request, isc_dyn_fld_type, dtype);
put_numeric(request, isc_dyn_fld_length, length);
put_numeric(request, isc_dyn_fld_scale, field->fld_scale);
}
//____________________________________________________________
//
// Generate dynamic DDL to create a field for CREATE
// or ALTER TABLE action.
//
// Emit the DDL that is appopriate for a local instance
// of a field. eg: that can vary from the local fields
// global field (DOMAIN in SQL).
//
static void put_field_attributes( gpre_req* request, const gpre_fld* field)
{
if (field->fld_flags & FLD_computed)
put_computed_blr(request, field);
if (!field->fld_global)
put_dtype(request, field);
// Put the DDL for local field instances
if (field->fld_array_info)
put_array_info(request, field);
if (field->fld_collate && field->fld_global) {
put_numeric(request, isc_dyn_fld_collation,
field->fld_collate->intlsym_collate_id);
}
if (field->fld_flags & FLD_not_null) {
request->add_byte(isc_dyn_fld_not_null);
}
if (field->fld_flags & FLD_computed)
put_computed_source(request, field);
}
//____________________________________________________________
//
// Put a numeric valued attributed to the output string.
//
static void put_numeric( gpre_req* request, USHORT blr_operator, SSHORT number)
{
request->add_byte(blr_operator);
request->add_word(2);
request->add_word(number);
}
//____________________________________________________________
//
// Put a counted string valued attributed to the output string.
// Count value is BYTE instead of WORD like put_cstring & put_string
//
static void put_short_cstring(gpre_req* request, USHORT ddl_operator,
const TEXT* string)
{
SSHORT length = 0;
if (string != NULL)
length = strlen(string);
STUFF_CHECK(length);
request->add_byte(ddl_operator);
request->add_byte(length);
if (string != NULL) {
while (length--)
request->add_byte(*string++);
}
}
//____________________________________________________________
//
// Put a counted string valued attributed to the output string.
//
static void put_string(gpre_req* request, USHORT ddl_operator,
const TEXT* string, USHORT length)
{
STUFF_CHECK(length);
if (ddl_operator) {
request->add_byte(ddl_operator);
request->add_word(length);
}
else
request->add_byte(length);
if (string != NULL) {
while (length--)
request->add_byte(*string++);
}
}
//____________________________________________________________
//
// Put a symbol valued attribute.
//
static void put_symbol(gpre_req* request, int ddl_operator,
const gpre_sym* symbol)
{
put_cstring(request, (USHORT) ddl_operator, symbol->sym_string);
}
//____________________________________________________________
//
// Generate BLR for a trigger whose action is to abort.
// Abort with a gds_error code error.
//
static void put_trigger_blr(gpre_req* request,
USHORT blr_operator,
GPRE_NOD node, pfn_local_trigger_cb routine)
{
request->add_byte(blr_operator);
const USHORT offset = request->req_blr - request->req_base;
request->add_word(0);
if (request->req_flags & REQ_blr_version4)
request->add_byte(blr_version4);
else
request->add_byte(blr_version5);
request->add_byte(blr_begin);
request->add_byte(blr_if);
(*routine) (node, request);
request->add_byte(blr_begin);
request->add_byte(blr_end);
// Generate the action for the trigger to be abort
request->add_byte(blr_abort);
put_short_cstring(request, blr_gds_code, "check_constraint");
request->add_byte(blr_end); // for if
request->add_byte(blr_eoc);
const USHORT length = request->req_blr - request->req_base - offset - 2;
request->req_base[offset] = (UCHAR) length;
request->req_base[offset + 1] = (UCHAR) (length >> 8);
}
//____________________________________________________________
//
// Generate BLR for a trigger for a VIEW WITH CHECK OPTION.
// This is messy, the gpre_rse passed in is mutilated by the end.
// Fields in the where clause and in the VIEW definition, are replaced
// by the VIEW fields.
// For fields in the where clause but not in the VIEW definition,
// the fields are set to NULL node for the PRE STORE trigger.
//
//
static void put_view_trigger_blr(gpre_req* request,
const gpre_rel* relation,
USHORT blr_operator,
gpre_trg* trigger,
GPRE_NOD view_boolean, gpre_ctx** contexts, GPRE_NOD set_list)
{
gpre_rse* node = (gpre_rse*) trigger->trg_boolean;
request->add_byte(blr_operator);
const USHORT offset = request->req_blr - request->req_base;
request->add_word(0);
if (request->req_flags & REQ_blr_version4)
request->add_byte(blr_version4);
else
request->add_byte(blr_version5);
request->add_byte(blr_begin);
if (trigger->trg_type == PRE_MODIFY_TRIGGER) {
request->add_byte(blr_for);
CME_rse(node, request);
// For the boolean, replace all fields in the rse and the view, with the
// equivalent view field_name, for remaining fields in rse, leave them
// alone.
replace_field_names(view_boolean, node->rse_fields,
relation->rel_fields, false, contexts);
request->add_byte(blr_begin);
request->add_byte(blr_if);
CME_expr(view_boolean, request);
request->add_byte(blr_begin);
request->add_byte(blr_end);
// Generate the action for the trigger to be abort
request->add_byte(blr_abort);
put_short_cstring(request, blr_gds_code, "check_constraint");
request->add_byte(blr_end);
request->add_byte(blr_end);
request->add_byte(blr_eoc);
} // end of PRE_MODIFY_TRIGGER trigger
if (trigger->trg_type == PRE_STORE_TRIGGER) {
replace_field_names(view_boolean, node->rse_fields,
relation->rel_fields, true, contexts);
request->add_byte(blr_if);
CME_expr(view_boolean, request);
request->add_byte(blr_begin);
request->add_byte(blr_end);
// Generate the action for the trigger to be abort
request->add_byte(blr_abort);
put_short_cstring(request, blr_gds_code, "check_constraint");
request->add_byte(blr_end);
request->add_byte(blr_eoc);
} // end of PRE_STORE_TRIGGER trigger
const USHORT length = request->req_blr - request->req_base - offset - 2;
request->req_base[offset] = (UCHAR) length;
request->req_base[offset + 1] = (UCHAR) (length >> 8);
}
//____________________________________________________________
//
// Replace fields in given rse by fields referenced in VIEW.
// if fields in gpre_rse are not part of VIEW definition, then they
// are not changed.
// If search list is not specified, then only the context of the fields
// in the rse is chaged to contexts[2].
// If null_them is true, then fields in rse but not in VIEW definition
// are converted to null nodes, this is used for PRE STORE trigger
// verification.
//
static void replace_field_names(gpre_nod* const input,
const gpre_nod* const search_list,
gpre_fld* const replace_with,
bool null_them,
gpre_ctx** contexts)
{
if (!input)
return;
if (((input->nod_type == nod_via) || (input->nod_type == nod_any) ||
(input->nod_type == nod_unique)) && (search_list == 0) &&
(replace_with == 0) && (input->nod_count == 0))
{
CPR_error("Invalid view WITH CHECK OPTION - no subqueries permitted");
return;
}
gpre_nod** ptr = input->nod_arg;
for (const gpre_nod* const* const end = ptr + input->nod_count; ptr < end; ptr++)
{
if ((*ptr)->nod_type == nod_field) {
ref* reference = (REF) (*ptr)->nod_arg[0];
gpre_fld* rse_field = reference->ref_field;
if (null_them) {
if (reference->ref_context == contexts[2]) {
*ptr = MSC_node(nod_null, 0);
}
continue;
}
reference->ref_context = contexts[2];
if (!search_list)
continue;
gpre_fld* view_field = replace_with;
gpre_nod* const* ptrs = search_list->nod_arg;
for (gpre_nod* const* const ends = ptrs + search_list->nod_count;
ptrs < ends;
ptrs++, view_field = (view_field) ? view_field->fld_next : NULL)
{
const ref* references = (REF) (*ptrs)->nod_arg[0];
gpre_fld* select_field = references->ref_field;
if (rse_field == select_field) {
reference->ref_field =
(view_field) ? view_field : select_field;
reference->ref_context = contexts[1];
break;
}
}
}
else
replace_field_names(*ptr, search_list, replace_with, null_them,
contexts);
}
}
//____________________________________________________________
//
// Generate dynamic DDL for a set statistics
//
static void set_statistics( gpre_req* request, const act* action)
{
const sts* stats = (STS) action->act_object;
if (stats)
if (stats->sts_flags & STS_index) {
put_cstring(request, isc_dyn_mod_idx, stats->sts_name->str_string);
request->add_byte(isc_dyn_idx_statistic);
}
request->add_end();
}
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