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118 lines
4.2 KiB
Python
118 lines
4.2 KiB
Python
#coding:utf-8
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"""
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ID: session.alter-session-reset-decfloat
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ISSUE: 6093
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TITLE: ALTER SESSION RESET: DECFLOAT parameters must be returned to default values
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DESCRIPTION:
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Test issue about ALTER SESSION RESET:
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"DECFLOAT parameters (BIND, TRAP and ROUND) must be reset to default values".
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We change all three specified parameters and evaluate some expressions.
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Then we run RESET SESSION and evaluate the same expressions.
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Results must differ for all of them.
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NOTE-1.
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firebird-driver does support DEFCFLOAT datatype, so test does *not* need to use only ISQL.
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NOTE-2. *** SET AUTODDL OFF REQUIRED ***
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Following is detailed explanation of this note:
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Default ISQL behaviour is to start always *TWO* transactions (for DML and second for DDL)
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after previous commit / rollback and before *ANY* further satement is to be executed, except
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those which control ISQL itself (e.g. 'SET TERM'; 'IN ...'; 'SET BAIL' etc).
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So, even when statement <S> has nothing to change, ISQL will start TWO transactions
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just before executing <S>.
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This means that these transactions will start even if want to run 'ALTER SESSION RESET'.
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This, in turn, makes one of them (which must perform DDL) be 'active and NOT current'
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from ALTER SESSION point of view (which is run within DML transaction).
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According to description given in #6093, ALTER SESSION throws error isc_ses_reset_err
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"if any open transaction exist in current conneciton, *except of current transaction* and
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prepared 2PC transactions which is allowed and ignored by this check".
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So, we have to prohibit 'autostart' of DDL-transaction because otherwise ALTER SESSION will
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throw: "SQLSTATE = 01002 / Cannot reset user session / -There are open transactions (2 active)".
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This is done by 'SET AUTODDL OFF' statement at the beginning of this test script.
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Thanks to Vlad for explanations (discussed 18.01.2021).
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FBTEST: functional.session.alter_session_reset_decfloat
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JIRA: CORE-5832
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"""
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import pytest
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from firebird.qa import *
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db = db_factory()
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test_script = """
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recreate table test(a decfloat, b decfloat, c decfloat);
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insert into test(a,b,c) values(1608.90, 5.00, 100.00);
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commit;
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set list on;
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set autoddl off;
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commit;
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set bind of decfloat to smallint;
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set decfloat traps to;
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set decfloat round ceiling;
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set sqlda_display on;
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select cast(1234.5678 as decfloat(16)) as "before_reset: check datatype" from rdb$database;
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set sqlda_display off;
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-- Should issue: Infinity
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select 1/1e-9999 as "before_reset: check division result" from rdb$database;
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select a * b / c as "before_reset: check round result" from test;
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--------------------
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alter session reset;
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--------------------
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set sqlda_display on;
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select cast(1234.5678 as decfloat(16)) as "after_reset: check datatype" from rdb$database;
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set sqlda_display off;
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-- Should issue:
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-- Statement failed, SQLSTATE = 22012
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-- Decimal float divide by zero. The code attempted to divide a DECFLOAT value by zero.
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select 1/1e-9999 "after_reset: check division result" from rdb$database;
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select a * b / c as "after_reset: check round result" from test;
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"""
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act = isql_act('db', test_script, substitutions=[('^((?!(SQLSTATE|divide|sqltype|before_reset|after_reset)).)*$', ''),
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('[ \t]+', ' '), ('.*alias.*', '')])
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expected_stdout = """
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01: sqltype: 500 SHORT scale: 0 subtype: 0 len: 2
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before_reset: check datatype 1235
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before_reset: check division result 0
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before_reset: check round result 81
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01: sqltype: 32760 DECFLOAT(16) scale: 0 subtype: 0 len: 8
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after_reset: check datatype 1234.5678
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after_reset: check round result 80.445
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"""
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expected_stderr = """
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Statement failed, SQLSTATE = 22012
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Decimal float divide by zero. The code attempted to divide a DECFLOAT value by zero.
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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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act.expected_stdout = expected_stdout
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act.expected_stderr = expected_stderr
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act.execute()
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assert (act.clean_stderr == act.clean_expected_stderr and
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act.clean_stdout == act.clean_expected_stdout)
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