firebird-qa/tests/bugs/core_6018_test.py

#coding:utf-8
#
# id:           bugs.core_6018
# title:        Make it possible to start multiple transactions (possibly in different attachments) using the same initial transaction snapshot
# decription:   
#                   We open first connect using FDB and set custom transaction parameter block which is used to start SNAPSHOT transaction.
#                   Within this first transaction (tx1a) we insert into test table record with value = -2 and commit this Tx.
#                   Then we do start next transaction (also SNAPSHOT; its name = 'tx1b') and obtain value of RDB$GET_CONTEXT('SYSTEM', 'SNAPSHOT_NUMBER').
#                   Also, in this second 'tx1b' we add one more record into table with value = -1 using autonomous transaction --> BOTH records should be seen 
#                   in another attachment that will be started after this moment.
#                   But if this (new) attachment will start Tx with requirement to use snapshot that was for Tx1a then it must see only FIRST record with value=-2.
#               
#                   We launch then ISQL for establish another transaction and make it perform two transactions:
#                   1) 'set transaction snapshot' --> must extract both records from test table
#                   === vs === 
#                   2) 'set transaction snapshot at number %(snap_num)s' --> must extract only FIRST record with value = -2.
#               
#                   THis is done TWO times: when based snapshot is KNOWN (i.e. tx1b is alive) and after tx1b is committed and base is unknown.
#                   Second ISQL launch must issue error:
#                       Statement failed, SQLSTATE = 0B000
#                       Transaction's base snapshot number does not exist
#               
#                   Checked on: 4.0.0.1457 (SS,CS) -- works fine.
#                
# tracker_id:   CORE-6018
# min_versions: ['4.0']
# versions:     4.0
# qmid:         None

import pytest
from firebird.qa import db_factory, isql_act, Action

# version: 4.0
# resources: None

substitutions_1 = []

init_script_1 = """
    recreate table tsn(sn int);
    commit;
  """

db_1 = db_factory(sql_dialect=3, init=init_script_1)

# test_script_1
#---
# import os
#  import re
#  import time
#  import subprocess
#  from subprocess import Popen
#  from fdb import services
#  
#  os.environ["ISC_USER"] = user_name
#  os.environ["ISC_PASSWORD"] = user_password
#  db_conn.close()
#  
#  customTPB = ( [ fdb.isc_tpb_concurrency, fdb.isc_tpb_nowait ] )
#  con1 = fdb.connect( dsn = dsn )
#  
#  tx1a=con1.trans( default_tpb = customTPB )
#  
#  cur1=tx1a.cursor()
#  cur1.execute('insert into tsn(sn) values( -2 )' )
#  tx1a.commit()
#  
#  sql_get_sn='''
#      execute block returns(o_sn bigint) as
#      begin
#          o_sn = RDB$GET_CONTEXT('SYSTEM', 'SNAPSHOT_NUMBER');
#          suspend;
#  
#          in autonomous transaction do
#          insert into tsn(sn) values( -1 );
#      end
#  '''
#  
#  tx1b=con1.trans( default_tpb = customTPB )
#  cur1=tx1b.cursor()
#  cur1.execute( sql_get_sn )
#  
#  snap_num = -1
#  for r in cur1:
#      snap_num = r[0]
#      # print( r[0] )
#  
#  for m in ('yet exists', 'does not exists'):
#      sql_chk_sn='''
#          -- NB!! looks strange but it seems that this 'SET BAIL ON' does not work here because
#          -- both records will be extracted in any case. // todo later: check it!
#          --set bail on;
#          set count on; 
#          commit; 
#          set transaction snapshot;
#          select 'Tx base snapshot: %(m)s' as msg, t.sn as set_tx_snapshot_without_num from tsn t order by sn;
#          commit;
#          set transaction snapshot at number %(snap_num)s;
#          select 'Tx base snapshot: %(m)s' as msg, t.sn as set_tx_snapshot_at_number_N from tsn t order by sn;
#          commit; 
#          quit;
#      ''' % ( locals() )
#  
#      #print(sql_chk_sn)
#  
#      runProgram('isql', [ dsn, '-q' ], sql_chk_sn)
#      if tx1b:
#          tx1b.commit()
#  
#  cur1.close()
#  con1.close()
#  
#    
#---
#act_1 = python_act('db_1', test_script_1, substitutions=substitutions_1)

expected_stdout_1 = """
    MSG                          SET_TX_SNAPSHOT_WITHOUT_NUM
    ============================ ===========================
    Tx base snapshot: yet exists                          -2
    Tx base snapshot: yet exists                          -1
    Records affected: 2
    MSG                          SET_TX_SNAPSHOT_AT_NUMBER_N
    ============================ ===========================
    Tx base snapshot: yet exists                          -2
    Records affected: 1

    MSG                               SET_TX_SNAPSHOT_WITHOUT_NUM
    ================================= ===========================
    Tx base snapshot: does not exists                          -2
    Tx base snapshot: does not exists                          -1
    Records affected: 2
    MSG                               SET_TX_SNAPSHOT_AT_NUMBER_N
    ================================= ===========================
    Tx base snapshot: does not exists                          -2
    Tx base snapshot: does not exists                          -1
    Records affected: 2
  """
expected_stderr_1 = """
    Statement failed, SQLSTATE = 0B000
    Transaction's base snapshot number does not exist
  """

@pytest.mark.version('>=4.0')
@pytest.mark.xfail
def test_1(db_1):
    pytest.fail("Test not IMPLEMENTED")