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в 13:45, 26 мая 2010
2010-05-26T13:45:56Z
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Admin: 1 версия
2010-05-26T10:13:52Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Using variable declaration options==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
postgres=# -- Using variable declaration options<br />
postgres=#<br />
postgres=# CREATE FUNCTION example_function () RETURNS text AS "<br />
postgres"# DECLARE<br />
postgres"#<br />
postgres"# -- Declare a constant integer with a default value of 5.<br />
postgres"# five CONSTANT INTEGER := 5;<br />
postgres"#<br />
postgres"# -- Declare an integer with a default value of 100 that cannot be NULL.<br />
postgres"# ten INTEGER NOT NULL := 10;<br />
postgres"#<br />
postgres"# -- Declare a character with a default value of "a".<br />
postgres"# letter CHAR DEFAULT ""a"";<br />
postgres"#<br />
postgres"# BEGIN<br />
postgres"# return letter;<br />
postgres"# END;<br />
postgres"# " LANGUAGE "plpgsql";<br />
CREATE FUNCTION<br />
postgres=#<br />
postgres=# select example_function ();<br />
example_function<br />
------------------<br />
a<br />
(1 row)<br />
postgres=#<br />
postgres=# drop function example_function ();<br />
DROP FUNCTION<br />
postgres=#<br />
postgres=#<br />
<br />
</source><br />
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==Variable Declarations==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
postgres=# -- Variable Declarations<br />
postgres=#<br />
postgres=# CREATE FUNCTION identifier () RETURNS int4 AS "<br />
postgres"# DECLARE<br />
postgres"#<br />
postgres"# -- Declare an integer.<br />
postgres"# subject_id INTEGER;<br />
postgres"#<br />
postgres"# -- Declare a variable length character.<br />
postgres"# book_title VARCHAR(10);<br />
postgres"#<br />
postgres"# -- Declare a floating point number.<br />
postgres"# book_price FLOAT;<br />
postgres"#<br />
postgres"# BEGIN<br />
postgres"# return 10;<br />
postgres"# END;<br />
postgres"# " LANGUAGE "plpgsql";<br />
ERROR: function "identifier" already exists with same argument types<br />
postgres=#<br />
postgres=# select identifier();<br />
identifier<br />
------------<br />
10<br />
(1 row)<br />
postgres=#<br />
postgres=# drop function identifier();<br />
DROP FUNCTION<br />
postgres=#<br />
postgres=#<br />
<br />
</source></div>
Admin