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><H1
><A
NAME="function.pg-prepare"
></A
>pg_prepare</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN186446"
></A
><P
> (PHP 5 >= 5.1.0RC1)</P
>pg_prepare -- Submits a request to create a prepared statement with the
given parameters, and waits for completion.</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186449"
></A
><H2
>说明</H2
>resource <B
CLASS="methodname"
>pg_prepare</B
> ( resource connection, string stmtname, string query )<BR
></BR
>resource <B
CLASS="methodname"
>pg_prepare</B
> ( string stmtname, string query )<BR
></BR
><P
> <B
CLASS="function"
>pg_prepare()</B
> creates a prepared statement for later execution with
<A
HREF="function.pg-execute.html"
><B
CLASS="function"
>pg_execute()</B
></A
> or <A
HREF="function.pg-send-execute.html"
><B
CLASS="function"
>pg_send_execute()</B
></A
>.
This feature allows commands that will be used repeatedly to
be parsed and planned just once, rather than each time they are executed.
<B
CLASS="function"
>pg_prepare()</B
> is supported only against PostgreSQL 7.4 or
higher connections; it will fail when using earlier versions.
</P
><P
> The function creates a prepared statement named <CODE
CLASS="parameter"
>stmtname</CODE
> from the <CODE
CLASS="parameter"
>query</CODE
>
string, which must contain a single SQL command. <CODE
CLASS="parameter"
>stmtname</CODE
> may be "" to
create an unnamed statement, in which case any pre-existing unnamed
statement is automatically replaced; otherwise it is an error if the
statement name is already defined in the current session. If any parameters
are used, they are referred to in the <CODE
CLASS="parameter"
>query</CODE
> as $1, $2, etc.
</P
><P
> Prepared statements for use with <B
CLASS="function"
>pg_prepare()</B
> can also be created by
executing SQL <TT
CLASS="literal"
>PREPARE</TT
> statements. (But <B
CLASS="function"
>pg_prepare()</B
> is more flexible since it
does not require parameter types to be pre-specified.) Also, although there
is no PHP function for deleting a prepared statement, the SQL <TT
CLASS="literal"
>DEALLOCATE</TT
>
statement can be used for that purpose.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186487"
></A
><H2
>参数</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>connection</CODE
></DT
><DD
><P
> PostgreSQL database connection resource. When
<CODE
CLASS="parameter"
>connection</CODE
> is not present, the default connection
is used. The default connection is the last connection made by
<A
HREF="function.pg-connect.html"
><B
CLASS="function"
>pg_connect()</B
></A
> or <A
HREF="function.pg-pconnect.html"
><B
CLASS="function"
>pg_pconnect()</B
></A
>.
</P
></DD
><DT
><CODE
CLASS="parameter"
>stmtname</CODE
></DT
><DD
><P
> The name to give the prepared statement. Must be unique per-connection. If
"" is specified, then an unnamed statement is created, overwriting any
previously defined unnamed statement.
</P
></DD
><DT
><CODE
CLASS="parameter"
>query</CODE
></DT
><DD
><P
> The parameterised SQL statement. Must contain only a single statement.
(multiple statements separated by semi-colons are not allowed.) If any parameters
are used, they are referred to as $1, $2, etc.
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186509"
></A
><H2
>返回值</H2
><P
> A query result resource on success, or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> on failure.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186513"
></A
><H2
>范例</H2
><P
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><DIV
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><A
NAME="AEN186516"
></A
><P
><B
>例 1. Using <B
CLASS="function"
>pg_prepare()</B
></B
></P
><TABLE
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><TR
><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br /></font><font color="#FF8000">// Connect to a database named "mary"<br /></font><font color="#0000BB">$dbconn </font><font color="#007700">= </font><font color="#0000BB">pg_connect</font><font color="#007700">(</font><font color="#DD0000">"dbname=mary"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// Prepare a query for execution<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">pg_prepare</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">, </font><font color="#DD0000">"my_query"</font><font color="#007700">, </font><font color="#DD0000">'SELECT * FROM shops WHERE name = $1'</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// Execute the prepared query. Note that it is not necessary to escape<br />// the string "Joe's Widgets" in any way<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">pg_execute</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">, </font><font color="#DD0000">"my_query"</font><font color="#007700">, array(</font><font color="#DD0000">"Joe's Widgets"</font><font color="#007700">));<br /><br /></font><font color="#FF8000">// Execute the same prepared query, this time with a different parameter<br /></font><font color="#0000BB">$result </font><font color="#007700">= </font><font color="#0000BB">pg_execute</font><font color="#007700">(</font><font color="#0000BB">$dbconn</font><font color="#007700">, </font><font color="#DD0000">"my_query"</font><font color="#007700">, array(</font><font color="#DD0000">"Clothes Clothes Clothes"</font><font color="#007700">));<br /><br /></font><font color="#0000BB">?></font>
</font>
</code></TD
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></DIV
></TD
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>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN186520"
></A
><H2
>参见</H2
><P
> <P
></P
><TABLE
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><TBODY
><TR
><TD
><A
HREF="function.pg-execute.html"
><B
CLASS="function"
>pg_execute()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.pg-send-execute.html"
><B
CLASS="function"
>pg_send_execute()</B
></A
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></P
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