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PostgreSQL/Postgre SQL/RAISE EXCEPTION - История изменений
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в 13:45, 26 мая 2010
2010-05-26T13:45:56Z
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2010-05-26T10:13:54Z
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<p><b>Новая страница</b></p><div>==Using RAISE EXCEPTION==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
postgres=#<br />
postgres=# -- Name: "raise_test" () Type: FUNCTION Owner: postgres<br />
postgres=# CREATE FUNCTION "raise_test" () RETURNS integer AS "<br />
postgres"# DECLARE<br />
postgres"#<br />
postgres"# -- Declare an integer variable for testing.<br />
postgres"#<br />
postgres"# an_integer INTEGER = 1;<br />
postgres"#<br />
postgres"# BEGIN<br />
postgres"#<br />
postgres"# -- Raise a debug level message.<br />
postgres"#<br />
postgres"# RAISE DEBUG ""The raise_test() function began."";<br />
postgres"#<br />
postgres"# an_integer = an_integer + 1;<br />
postgres"#<br />
postgres"# -- Raise a notice stating that the an_integer<br />
postgres"# -- variable was changed, then raise another notice<br />
postgres"# -- stating its new value.<br />
postgres"#<br />
postgres"# RAISE NOTICE ""Variable an_integer was changed."";<br />
postgres"# RAISE NOTICE ""Variable an_integer value is now %."",an_integer;<br />
postgres"#<br />
postgres"# -- Raise an exception.<br />
postgres"#<br />
postgres"# RAISE EXCEPTION ""Variable % changed. Aborting transaction."",an_integer;<br />
postgres"#<br />
postgres"# END;<br />
postgres"# " LANGUAGE "plpgsql";<br />
CREATE FUNCTION<br />
postgres=#<br />
postgres=# select raise_test();<br />
NOTICE: Variable an_integer was changed.<br />
NOTICE: Variable an_integer value is now 2.<br />
ERROR: Variable 2 changed. Aborting transaction.<br />
postgres=#<br />
postgres=#<br />
<br />
</source></div>
Admin