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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 297028 $ -->
<!-- splitted from ./en/functions/pgsql.xml, last change in rev 1.2 -->
<refentry xml:id='function.pg-send-query' xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>pg_send_query</refname>
<refpurpose>
Sends asynchronous query
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>bool</type><methodname>pg_send_query</methodname>
<methodparam><type>resource</type><parameter>connection</parameter></methodparam>
<methodparam><type>string</type><parameter>query</parameter></methodparam>
</methodsynopsis>
<para>
<function>pg_send_query</function> sends a query or queries asynchronously to the
<parameter>connection</parameter>. Unlike
<function>pg_query</function>, it can send multiple queries at once to
PostgreSQL and get the results one by one using
<function>pg_get_result</function>.
</para>
<para>
Script execution is not blocked while the queries are executing. Use
<function>pg_connection_busy</function> to check if the connection is
busy (i.e. the query is executing). Queries may be cancelled using
<function>pg_cancel_query</function>.
</para>
<para>
Although the user can send multiple queries at once, multiple queries
cannot be sent over a busy connection. If a query is sent while
the connection is busy, it waits until the last query is finished and
discards all its results.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>connection</parameter></term>
<listitem>
<para>
PostgreSQL database connection resource.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>query</parameter></term>
<listitem>
<para>
The SQL statement or statements to be executed.
</para>
<para>
Data inside the query should be <link
linkend="function.pg-escape-string">properly escaped</link>.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>&return.success;</para>
<para>
Use <function>pg_get_result</function> to determine the query result.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>pg_send_query</function> example</title>
<programlisting role="php">
<![CDATA[
<?php
$dbconn = pg_connect("dbname=publisher") or die("Could not connect");
if (!pg_connection_busy($dbconn)) {
pg_send_query($dbconn, "select * from authors; select count(*) from authors;");
}
$res1 = pg_get_result($dbconn);
echo "First call to pg_get_result(): $res1\n";
$rows1 = pg_num_rows($res1);
echo "$res1 has $rows1 records\n\n";
$res2 = pg_get_result($dbconn);
echo "Second call to pg_get_result(): $res2\n";
$rows2 = pg_num_rows($res2);
echo "$res2 has $rows2 records\n";
?>
]]>
</programlisting>
&example.outputs;
<screen>
<![CDATA[
First call to pg_get_result(): Resource id #3
Resource id #3 has 3 records
Second call to pg_get_result(): Resource id #4
Resource id #4 has 1 records
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>pg_query</function></member>
<member><function>pg_cancel_query</function></member>
<member><function>pg_get_result</function></member>
<member><function>pg_connection_busy</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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