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134 lines
3.5 KiB
C++
134 lines
3.5 KiB
C++
/*
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* PROGRAM: JRD Access Method
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* MODULE: met.h
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* DESCRIPTION: Random meta-data stuff
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*
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* The contents of this file are subject to the Interbase Public
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* License Version 1.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy
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* of the License at http://www.Inprise.com/IPL.html
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*
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* Software distributed under the License is distributed on an
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* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
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* or implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code was created by Inprise Corporation
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* and its predecessors. Portions created by Inprise Corporation are
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* Copyright (C) Inprise Corporation.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*/
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#ifndef JRD_MET_H
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#define JRD_MET_H
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/* Record types for record summary blob records */
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enum rsr_t {
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RSR_field_id,
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RSR_field_name,
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RSR_view_context,
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RSR_base_field,
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RSR_computed_blr,
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RSR_missing_value,
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RSR_default_value,
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RSR_validation_blr,
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RSR_security_class,
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RSR_trigger_name,
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RSR_dimensions,
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RSR_array_desc,
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RSR_relation_id, /* The following are Gateway specific */
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RSR_relation_name, /* and are used to speed the acquiring */
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RSR_rel_sys_flag, /* of relation information */
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RSR_view_blr,
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RSR_owner_name,
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RSR_field_type, /* The following are also Gateway */
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RSR_field_scale, /* specific and relate to field info */
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RSR_field_length,
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RSR_field_sub_type,
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RSR_field_not_null
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};
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/* Temporary field block */
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class TemporaryField : public pool_alloc<type_tfb>
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{
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public:
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TemporaryField* tfb_next; /* next block in chain */
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USHORT tfb_id; /* id of field in relation */
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USHORT tfb_flags;
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DSC tfb_desc;
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};
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// tfb_flags
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const int TFB_computed = 1;
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const int TFB_array = 2;
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// index status
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const SSHORT MET_object_active = 0;
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const SSHORT MET_object_inactive = 1;
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const SSHORT MET_object_unknown = 2;
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const int TRIGGER_PRE_STORE = 1;
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const int TRIGGER_POST_STORE = 2;
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const int TRIGGER_PRE_MODIFY = 3;
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const int TRIGGER_POST_MODIFY = 4;
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const int TRIGGER_PRE_ERASE = 5;
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const int TRIGGER_POST_ERASE = 6;
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const int TRIGGER_MAX = 7;
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// trigger type prefixes
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const int TRIGGER_PRE = 0;
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const int TRIGGER_POST = 1;
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// trigger type suffixes
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const int TRIGGER_STORE = 1;
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const int TRIGGER_MODIFY = 2;
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const int TRIGGER_ERASE = 3;
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// that's how trigger action types are encoded
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/*
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bit 0 = TRIGGER_PRE/TRIGGER_POST flag,
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bits 1-2 = TRIGGER_STORE/TRIGGER_MODIFY/TRIGGER_ERASE (slot #1),
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bits 3-4 = TRIGGER_STORE/TRIGGER_MODIFY/TRIGGER_ERASE (slot #2),
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bits 5-6 = TRIGGER_STORE/TRIGGER_MODIFY/TRIGGER_ERASE (slot #3),
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and finally the above calculated value is decremented
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example #1:
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TRIGGER_POST_ERASE =
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= ((TRIGGER_ERASE << 1) | TRIGGER_POST) - 1 =
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= ((3 << 1) | 1) - 1 =
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= 0x00000110 (6)
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example #2:
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TRIGGER_PRE_STORE_MODIFY =
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= ((TRIGGER_MODIFY << 3) | (TRIGGER_STORE << 1) | TRIGGER_PRE) - 1 =
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= ((2 << 3) | (1 << 1) | 0) - 1 =
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= 0x00010001 (17)
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example #3:
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TRIGGER_POST_MODIFY_ERASE_STORE =
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= ((TRIGGER_STORE << 5) | (TRIGGER_ERASE << 3) | (TRIGGER_MODIFY << 1) | TRIGGER_POST) - 1 =
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= ((1 << 5) | (3 << 3) | (2 << 1) | 1) - 1 =
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= 0x00111100 (60)
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*/
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// that's how trigger types are decoded
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#define TRIGGER_ACTION(value, shift) \
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(((((value + 1) >> shift) & 3) << 1) | ((value + 1) & 1)) - 1
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#define TRIGGER_ACTION_SLOT(value, slot) \
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TRIGGER_ACTION(value, (slot * 2 - 1) )
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const int TRIGGER_COMBINED_MAX = 128;
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#include "../jrd/obj.h"
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#endif /* JRD_MET_H */
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