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Added/Updated tests\bugs\core_0790_test.py: refactored, see notes.
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pavel-zotov
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"""
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ID: issue-1175
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ISSUE: 1175
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TITLE: Alter view
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ISSUE: https://github.com/FirebirdSQL/firebird/issues/1175
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TITLE: Ability to run ALTER VIEW statement without dropping dependencies
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DESCRIPTION:
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Test creates a table and view ('v_words') based on it.
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Then we create several PSQL units and views which depend on that view v_words and on each other.
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After this, we run ALTER VIEW V_WORDS and change expression for one of it column - it must be performed without errors.
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Finally, we check data that is shown by each of dependent views.
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JIRA: CORE-790
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FBTEST: bugs.core_0790
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NOTES:
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[04.10.2023] pzotov
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RECONNECT is required after altering V_WORDS! Otherwise PSQL objects remain show 'old' data.
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Checked on fresh 3.x, 4.x, 5.x and 6.x.
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"""
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import pytest
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from firebird.qa import *
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init_script = """create table users (
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id integer,
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name varchar(20),
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passwd varchar(20)
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);
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create view v_users as
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select name from users;
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commit;"""
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init_script = """
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create table words (
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id int
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,name varchar(20)
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);
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commit;
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insert into words(id, name) values(2, 'tab');
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insert into words(id, name) values(3, 'case');
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insert into words(id, name) values(0, 'war');
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insert into words(id, name) values(1, 'flow');
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commit;
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"""
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db = db_factory(init=init_script)
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test_script = """alter view v_users (id, name, passwd ) as
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select id, name, passwd from users;
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commit;
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show view v_users;
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create view v_users_name as
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select name from v_users;
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commit;
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alter view v_users (id, name ) as
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select id, name from users;
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commit;
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show view v_users;
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show view v_users_name;
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test_script = """
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set bail on;
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set term ^;
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create view v_words as select id, name from words
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^
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create procedure sp_get_word_by_pattern(a_name_pattern varchar(50)) returns(name type of column words.name) as
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begin
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for
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execute statement ('select v.name from v_words v where v.name similar to ?') (:a_name_pattern)
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into name
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do suspend;
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end
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^
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create procedure sp_get_word_by_id(a_id type of column words.id) returns (name type of column words.name) as
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begin
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for select v.name from v_words v where v.id = :a_id into name do suspend;
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end
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^
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create function fn_get_word_by_id(a_id type of column words.id) returns type of column words.name as
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begin
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return (select v.name from v_words v where v.id = :a_id);
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end
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^
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create view v_words_similar_to_o as select p.name as name_similar_to_o from sp_get_word_by_pattern('%(wolf)%') p
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^
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create view v_sp_get_word_by_id as select name as name_by_id_using_sp from sp_get_word_by_id(1)
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^
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create view v_fn_get_word_by_id as select fn_get_word_by_id(1) as name_by_id_using_fn from rdb$database
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^
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create function fn_count_words_by_pattern(a_name_pattern varchar(50)) returns int as
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begin
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return (select count(*) from sp_get_word_by_pattern(:a_name_pattern));
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end
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^
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create view v_count_words_similar_to_a as select fn_count_words_by_pattern('%(raw|esac|bat)%') as cnt from rdb$database
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^
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set term ;^
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commit;
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-- Result: view V_words has 5 dependencies.
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-- We can not drop columns 'id' and 'name' but we *must* have ability change expression based on them
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alter view v_words as
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select reverse(name) as name, id
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from words;
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commit;
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connect '$(DSN)'; -- ::: NB ::: this is mandatory! Otherwise PSQL objects based on this view will show 'old' data ('flow' instead of 'wolf' etc).
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set list on;
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set count on;
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set echo on;
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select * from v_count_words_similar_to_a;
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select * from v_words_similar_to_o order by 1;
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select * from v_sp_get_word_by_id;
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select * from v_fn_get_word_by_id;
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select v.name from v_words v where v.id = 1;
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"""
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act = isql_act('db', test_script)
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expected_stdout = """Database: test.fdb, User: SYSDBA
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SQL> CON> SQL> SQL> ID INTEGER Nullable
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NAME VARCHAR(20) Nullable
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PASSWD VARCHAR(20) Nullable
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View Source:
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==== ======
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select id, name, passwd from users
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SQL> CON> SQL> SQL> CON> SQL> SQL> ID INTEGER Nullable
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NAME VARCHAR(20) Nullable
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View Source:
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==== ======
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select id, name from users
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SQL> NAME VARCHAR(20) Nullable
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View Source:
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==== ======
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select name from v_users
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SQL> SQL> SQL> SQL>
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expected_stdout = """
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select * from v_count_words_similar_to_a;
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CNT 3
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Records affected: 1
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select * from v_words_similar_to_o order by 1;
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NAME_SIMILAR_TO_O wolf
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Records affected: 1
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select * from v_sp_get_word_by_id;
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NAME_BY_ID_USING_SP wolf
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Records affected: 1
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select * from v_fn_get_word_by_id;
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NAME_BY_ID_USING_FN wolf
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Records affected: 1
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select v.name from v_words v where v.id = 1;
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NAME wolf
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Records affected: 1
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"""
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@pytest.mark.version('>=3')
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def test_1(act: Action):
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act.expected_stdout = expected_stdout
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act.execute()
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act.execute(combine_output = True)
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assert act.clean_stdout == act.clean_expected_stdout
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