php-doc-en/reference/ibm_db2/functions/db2-pconnect.xml

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<refentry xml:id="function.db2-pconnect" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>db2_pconnect</refname>
  <refpurpose>
   Returns a persistent connection to a database
  </refpurpose>
 </refnamediv>
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>db2_pconnect</methodname>
   <methodparam><type>string</type><parameter>database</parameter></methodparam>
   <methodparam><type>string</type><parameter>username</parameter></methodparam>
   <methodparam><type>string</type><parameter>password</parameter></methodparam>
   <methodparam choice="opt"><type>array</type><parameter>options</parameter></methodparam>
  </methodsynopsis>


  <para>
   Returns a persistent connection to an IBM DB2 Universal Database, IBM
   Cloudscape, or Apache Derby database. For more information on persistent
   connections, refer to <xref linkend='features.persistent-connections' />.
  </para>

  <para>
   Calling <function>db2_close</function> on a persistent connection always
   returns &true;, but the underlying DB2 client connection remains open and
   waiting to serve the next matching <function>db2_pconnect</function>
   request.
  </para>

 </refsect1>
 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>database</parameter></term>
     <listitem>
      <para>
       The database alias in the DB2 client catalog.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>username</parameter></term>
     <listitem>
      <para>
       The username with which you are connecting to the database.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>password</parameter></term>
     <listitem>
      <para>
       The password with which you are connecting to the database.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>options</parameter></term>
     <listitem>
      <para>
       An associative array of connection options that affect the behavior
       of the connection, where valid array keys include:
       <variablelist>
        <varlistentry>
         <term><parameter>autocommit</parameter></term>
         <listitem>
          <para>
           Passing the <literal>DB2_AUTOCOMMIT_ON</literal> value turns
           autocommit on for this connection handle.
          </para>
          <para>
           Passing the <literal>DB2_AUTOCOMMIT_OFF</literal> value turns
           autocommit off for this connection handle.
          </para>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>DB2_ATTR_CASE</parameter></term>
         <listitem>
          <para>
           Passing the <literal>DB2_CASE_NATURAL</literal> value specifies
           that column names are returned in natural case.
          </para>
          <para>
           Passing the <literal>DB2_CASE_LOWER</literal> value specifies
           that column names are returned in lower case.
          </para>
          <para>
           Passing the <literal>DB2_CASE_UPPER</literal> value specifies
           that column names are returned in upper case.
          </para>
         </listitem>
        </varlistentry>
        <varlistentry>
         <term><parameter>CURSOR</parameter></term>
         <listitem>
          <para>
           Passing the <literal>DB2_FORWARD_ONLY</literal> value specifies a
           forward-only cursor for a statement resource. This is the default
           cursor type and is supported on all database servers.
          </para>
          <para>
           Passing the <literal>DB2_SCROLLABLE</literal> value specifies a
           scrollable cursor for a statement resource. This mode enables
           random access to rows in a result set, but currently is supported
           only by IBM DB2 Universal Database.
          </para>
         </listitem>
        </varlistentry>
       </variablelist>
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>
 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a connection handle resource if the connection attempt is
   successful. <function>db2_pconnect</function> tries to reuse an existing
   connection resource that exactly matches the
   <parameter>database</parameter>, <parameter>username</parameter>, and
   <parameter>password</parameter> parameters. If the connection attempt fails,
   <function>db2_pconnect</function> returns &false;.
  </para>
 </refsect1>

 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>A <function>db2_pconnect</function> example</title>
    <para>
     In the following example, the first call to
     <function>db2_pconnect</function> returns a new persistent connection
     resource. The second call to <function>db2_pconnect</function> returns
     a persistent connection resource that simply reuses the first persistent
     connection resource.
    </para>
    <programlisting role="php">
<![CDATA[
<?php
$database = 'SAMPLE';
$user = 'db2inst1';
$password = 'ibmdb2';

$pconn = db2_pconnect($database, $user, $password);

if ($pconn) {
    echo "Persistent connection succeeded.";
}
else {
    echo "Persistent connection failed.";
}

$pconn2 = db2_pconnect($database, $user, $password);
if ($pconn) {
    echo "Second persistent connection succeeded.";
}
else {
    echo "Second persistent connection failed.";
}
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
Persistent connection succeeded.
Second persistent connection succeeded.
]]>
    </screen>
   </example>
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>db2_connect</function></member>
   </simplelist>
  </para>
 </refsect1>


</refentry>

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