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129 lines
5.1 KiB
Python
129 lines
5.1 KiB
Python
#coding:utf-8
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#
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# id: functional.session.alter_session_reset_decfloat
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# title:
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# ALTER SESSION RESET: DECFLOAT parameters must be returned to default values
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#
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# decription:
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# Test issue from CORE-5832 about ALTER SESSION RESET:
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# "DECFLOAT parameters (BIND, TRAP and ROUND) must be reset to default values".
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#
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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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#
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# NOTE-1.
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# FDB driver 2.0.1 does not support DEFCFLOAT datatype (at least version 2.0.1),
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# so test type must be ISQL.
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#
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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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# ========
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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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#
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# According to description given in CORE-5832, 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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#
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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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# ========
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#
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# Thanks to Vlad for explanations (discussed 18.01.2021).
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# Checked on 4.0.0.2307 SS/CS.
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#
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# tracker_id:
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# min_versions: ['4.0.0']
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# versions: 4.0
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# qmid: None
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import pytest
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from firebird.qa import db_factory, isql_act, Action
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# version: 4.0
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# resources: None
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substitutions_1 = [('^((?!(sqltype|before_reset|after_reset)).)*$', ''), ('[ \t]+', ' '), ('.*alias.*', '')]
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init_script_1 = """"""
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db_1 = db_factory(sql_dialect=3, init=init_script_1)
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test_script_1 = """
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recreate table test(a decfloat, b decfloat, c decfloat);
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insert into test(a,b,c) values(1608.90, 5.00, 100.00);
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commit;
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set list on;
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set autoddl off;
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commit;
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set bind of decfloat to smallint;
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set decfloat traps to;
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set decfloat round ceiling;
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set sqlda_display on;
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select cast(1234.5678 as decfloat(16)) as "before_reset: check datatype" from rdb$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_1 = isql_act('db_1', test_script_1, substitutions=substitutions_1)
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expected_stdout_1 = """
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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_1 = """
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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_1: Action):
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act_1.expected_stdout = expected_stdout_1
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act_1.expected_stderr = expected_stderr_1
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act_1.execute()
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assert act_1.clean_expected_stderr == act_1.clean_stderr
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assert act_1.clean_expected_stdout == act_1.clean_stdout
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