mirror of
https://github.com/FirebirdSQL/firebird-qa.git
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119 lines
4.9 KiB
Python
119 lines
4.9 KiB
Python
#coding:utf-8
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"""
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ID: issue-6268
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ISSUE: 6268
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TITLE: Make it possible to start multiple transactions (possibly in different attachments)
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using the same initial transaction snapshot
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DESCRIPTION:
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We open first connect using FDB and set custom transaction parameter block which is used to start SNAPSHOT transaction.
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Within this first transaction (tx1a) we insert into test table record with value = -2 and commit this Tx.
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Then we do start next transaction (also SNAPSHOT; its name = 'tx1b') and obtain value of RDB$GET_CONTEXT('SYSTEM', 'SNAPSHOT_NUMBER').
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Also, in this second 'tx1b' we add one more record into table with value = -1 using autonomous transaction --> BOTH records should be seen
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in another attachment that will be started after this moment.
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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.
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We launch then ISQL for establish another transaction and make it perform two transactions:
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1) 'set transaction snapshot' --> must extract both records from test table
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=== vs ===
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2) 'set transaction snapshot at number %(snap_num)s' --> must extract only FIRST record with value = -2.
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This is done TWO times: when based snapshot is KNOWN (i.e. tx1b is alive) and after tx1b is committed and base is unknown.
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Second ISQL launch must issue error:
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Statement failed, SQLSTATE = 0B000
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Transaction's base snapshot number does not exist
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JIRA: CORE-6018
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FBTEST: bugs.core_6018
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"""
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import pytest
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from firebird.qa import *
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from firebird.driver import tpb, Isolation
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init_script = """
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recreate table tsn (sn int);
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commit;
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"""
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db = db_factory(init=init_script)
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act = python_act('db')
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expected_stdout_a = """
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MSG SET_TX_SNAPSHOT_WITHOUT_NUM
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============================ ===========================
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Tx base snapshot: yet exists -2
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Tx base snapshot: yet exists -1
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Records affected: 2
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MSG SET_TX_SNAPSHOT_AT_NUMBER_N
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============================ ===========================
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Tx base snapshot: yet exists -2
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Records affected: 1
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"""
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expected_stdout_b = """
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MSG SET_TX_SNAPSHOT_WITHOUT_NUM
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================================= ===========================
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Tx base snapshot: does not exists -2
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Tx base snapshot: does not exists -1
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Records affected: 2
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MSG SET_TX_SNAPSHOT_AT_NUMBER_N
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================================= ===========================
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Tx base snapshot: does not exists -2
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Tx base snapshot: does not exists -1
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Records affected: 2
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"""
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expected_stderr = """
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Statement failed, SQLSTATE = 0B000
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Transaction's base snapshot number does not exist
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"""
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@pytest.mark.version('>=4.0')
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def test_1(act: Action):
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custom_tpb = tpb(isolation=Isolation.CONCURRENCY, lock_timeout=0)
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with act.db.connect() as con1:
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tx1a = con1.transaction_manager(custom_tpb)
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tx1a.begin()
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cur1 = tx1a.cursor()
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cur1.execute('insert into tsn (sn) values( -2 )')
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tx1a.commit()
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#
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sql_get_sn = """
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execute block returns(o_sn bigint) as
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begin
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o_sn = RDB$GET_CONTEXT('SYSTEM', 'SNAPSHOT_NUMBER');
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suspend;
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in autonomous transaction do
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insert into tsn(sn) values( -1 );
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end
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"""
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tx1b = con1.transaction_manager(custom_tpb)
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cur1 = tx1b.cursor()
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snap_num = cur1.execute(sql_get_sn).fetchone()[0]
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#
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for msg, expect_out, expect_err in [('yet exists', expected_stdout_a, ''),
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('does not exists', expected_stdout_b, expected_stderr)]:
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sql_chk_sn = f"""
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-- NB!! looks strange but it seems that this 'SET BAIL ON' does not work here because
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-- both records will be extracted in any case. // todo later: check it!
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--set bail on;
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set count on;
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commit;
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set transaction snapshot;
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select 'Tx base snapshot: {msg}' as msg, t.sn as set_tx_snapshot_without_num from tsn t order by sn;
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commit;
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set transaction snapshot at number {snap_num};
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select 'Tx base snapshot: {msg}' as msg, t.sn as set_tx_snapshot_at_number_N from tsn t order by sn;
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commit;
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quit;
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"""
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act.reset()
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act.expected_stdout = expect_out
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act.expected_stderr = expect_err
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act.isql(switches=['-q'], input=sql_chk_sn)
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if tx1b.is_active():
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tx1b.commit()
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assert act.clean_stdout == act.clean_expected_stdout
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