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5d42c0f3
编写于
1月 09, 2001
作者:
B
Bruce Momjian
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A patch for doc/src/sgml/plsql.sgml to add a little more info about PL/pgSQL
EXECUTE. -- -------- Robert B. Easter
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doc/src/sgml/plsql.sgml
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doc/src/sgml/plsql.sgml
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5d42c0f3
<!--
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/plsql.sgml,v 2.1
2 2001/01/06 12:26:08 petere
Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/Attic/plsql.sgml,v 2.1
3 2001/01/09 15:26:16 momjian
Exp $
-->
-->
<chapter id="plsql">
<chapter id="plsql">
...
@@ -488,20 +488,30 @@ PERFORM <replaceable>query</replaceable>
...
@@ -488,20 +488,30 @@ PERFORM <replaceable>query</replaceable>
<listitem>
<listitem>
<cmdsynopsis>
<cmdsynopsis>
<command>EXECUTE</command>
<command>EXECUTE</command>
<arg choice="req"><replaceable class="command">query</replaceable></arg>
<arg choice="req"><replaceable class="command">query
-string
</replaceable></arg>
</cmdsynopsis>
</cmdsynopsis>
<para>
where <replaceable>query-string</replaceable> is a string
of type TEXT containing the <replaceable>query</replaceable> to be executed.
</para>
<para>
<para>
Unlike all other queries in PL/pgSQL, a
Unlike all other queries in PL/pgSQL, a
<replaceable>query</replaceable> run by an EXECUTE statement
<replaceable>query</replaceable> run by an EXECUTE statement
is not prepared and saved just once during the life of the
is not prepared and saved just once during the life of the
server. Instead, the <replaceable>query</replaceable> is
server. Instead, the <replaceable>query</replaceable> is
prepared each time the statement is run. Th
is allows th
e
prepared each time the statement is run. The
<replaceable>query
</replaceable> to
be dynamically created
<replaceable>query
-string</replaceable> can
be dynamically created
within the procedure to perform actions on variable tables and
within the procedure to perform actions on variable tables and
fields.
fields.
</para>
</para>
<para>
The results from SELECT queries are discarded by EXECUTE unless
SELECT INTO is used to save the results into a table.
</para>
<para>
<para>
An example:
An example:
<programlisting>
<programlisting>
...
...
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