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73 lines
2.6 KiB
Python
73 lines
2.6 KiB
Python
#coding:utf-8
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"""
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ID: issue-6621
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ISSUE: 6621
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TITLE: Triggers accessing a table prevent concurrent DDL command from dropping that table
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DESCRIPTION:
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Test creates two tables which are linked by master-detail relationship.
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We add one record into the main table and then update it with issuing further COMMIT.
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After this we try to DROP this table in another connect.
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If this connect started WAIT transaction (i.e. without lock timeout) then it can hang forever if case of
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regression of this fix. Because of this, we change its waiting mode by adding lock_timeout parameter to
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TPB and set it to 1 second.
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BEFORE fix this lead to:
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DatabaseError: / Error while commiting transaction: / - SQLCODE: -901
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- lock time-out on wait transaction / - unsuccessful metadata update
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- object TABLE "T_DETL" is in use / -901 / 335544510
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AFTER fix this DROP TABLE statement must pass without any error.
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JIRA: CORE-6382
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FBTEST: bugs.core_6382
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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 t_detl(id int primary key using index t_detl_pk, pid int);
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recreate table t_main(id int primary key using index t_main_pk);
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alter table t_detl add constraint t_detl_fk foreign key(pid) references t_main(id) on update cascade using index t_detl_fk;
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commit;
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insert into t_main values(123);
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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 = """
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None
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Passed.
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"""
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@pytest.mark.version('>=4.0')
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def test_1(act: Action, capsys):
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# # NB: adding this timeout does NOT change WAIT-nature of transaction as it is considered by engine.
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# # (in other words: such transaction will not became 'no wait' which must not be used in this test):
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custom_tpb = tpb(isolation=Isolation.SNAPSHOT, lock_timeout=5)
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#
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with act.db.connect() as con1, act.db.connect() as con2:
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con1.main_transaction.default_tpb = custom_tpb
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con2.main_transaction.default_tpb = custom_tpb
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#
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con1.execute_immediate('update t_main set id=-id')
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con1.commit()
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con2.execute_immediate('drop table t_detl')
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con2.commit()
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cur = con2.cursor()
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cur.execute("select r.rdb$relation_name from rdb$database d left join rdb$relations r on r.rdb$relation_name = upper('t_detl')")
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for r in cur:
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print(r[0])
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print('Passed.')
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# Check
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act.expected_stdout = expected_stdout
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act.stdout = capsys.readouterr().out
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assert act.clean_stdout == act.clean_expected_stdout
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