pg-send-query.xml

<?xml version="1.0" encoding="utf-8"?>
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<!-- 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 class="union"><type>int</type><type>bool</type></type><methodname>pg_send_query</methodname>
   <methodparam><type>PgSql\Connection</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>
      &pgsql.parameter.connection;
     </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>
   Returns &true; on success, &false; or <literal>0</literal> on failure.  Use <function>pg_get_result</function>
   to determine the query result.
  </para>
 </refsect1>

 <refsect1 role="changelog">
  &reftitle.changelog;
  <informaltable>
   <tgroup cols="2">
    <thead>
     <row>
      <entry>&Version;</entry>
      <entry>&Description;</entry>
     </row>
    </thead>
    <tbody>
     &pgsql.changelog.connection-object;
    </tbody>
   </tgroup>
  </informaltable>
 </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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