php-doc-en/reference/oci8/functions/ocilogon.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.14 $ -->
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<!-- splitted from ./en/functions/oci8.xml, last change in rev 1.2 -->
  <refentry id="function.ocilogon">
   <refnamediv>
    <refname>ocilogon</refname>
    <refpurpose>Establishes a connection to Oracle</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>resource</type><methodname>ocilogon</methodname>
      <methodparam><type>string</type><parameter>username</parameter></methodparam>
      <methodparam><type>string</type><parameter>password</parameter></methodparam>
      <methodparam choice="opt"><type>string</type><parameter>db</parameter></methodparam>
      <methodparam choice="opt"><type>string</type><parameter>charset</parameter></methodparam>
     </methodsynopsis>
    <para>
     <function>ocilogon</function> returns an connection identifier
     needed for most other OCI calls.  The optional third parameter
     can either contain the name of the local Oracle instance or the
     name of the entry in tnsnames.ora to which you want to connect.
     If the optional third parameter is not specified, PHP uses the
     environment variables ORACLE_SID (Oracle instance) or TWO_TASK
     (tnsnames.ora) to determine which database to connect to.
    </para>
    &oci.charset;  
    <para>Connections are shared at the page level when using
     <function>ocilogon</function>.  This means that commits and
     rollbacks apply to all open transactions in the page, even if you
     have created multiple connections.
    </para>
    <para>
     This example demonstrates how the connections are shared.
     <example>
      <title><function>ocilogon</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
echo "<pre>";
$db = "";

$c1 = ocilogon("scott", "tiger", $db);
$c2 = ocilogon("scott", "tiger", $db);

function create_table($conn) 
{
  $stmt = ociparse($conn, "create table scott.hallo (test varchar2(64))");
  ociexecute($stmt);
  echo $conn . " created table\n\n";
}

function drop_table($conn) 
{
  $stmt = ociparse($conn, "drop table scott.hallo");
  ociexecute($stmt);
  echo $conn . " dropped table\n\n";
}

function insert_data($conn) 
{
  $stmt = ociparse($conn, "insert into scott.hallo 
            values('$conn' || ' ' || to_char(sysdate,'DD-MON-YY HH24:MI:SS'))");
  ociexecute($stmt, OCI_DEFAULT);
  echo $conn . " inserted hallo\n\n";
}

function delete_data($conn) 
{
  $stmt = ociparse($conn, "delete from scott.hallo");
  ociexecute($stmt, OCI_DEFAULT);
  echo $conn . " deleted hallo\n\n";
}

function commit($conn) 
{
  ocicommit($conn);
  echo $conn . " committed\n\n";
}

function rollback($conn) 
{
  ocirollback($conn);
  echo $conn . " rollback\n\n";
}

function select_data($conn) 
{
  $stmt = ociparse($conn, "select * from scott.hallo");
  ociexecute($stmt, OCI_DEFAULT);
  echo $conn."----selecting\n\n";
  while (ocifetch($stmt)) {
    echo $conn . " [" . ociresult($stmt, "TEST") . "]\n\n";
  }
  echo $conn . "----done\n\n";
}

create_table($c1);
insert_data($c1);   // Insert a row using c1
insert_data($c2);   // Insert a row using c2

select_data($c1);   // Results of both inserts are returned
select_data($c2);   

rollback($c1);      // Rollback using c1

select_data($c1);   // Both inserts have been rolled back
select_data($c2);   

insert_data($c2);   // Insert a row using c2
commit($c2);        // Commit using c2

select_data($c1);   // Result of c2 insert is returned

delete_data($c1);   // Delete all rows in table using c1
select_data($c1);   // No rows returned
select_data($c2);   // No rows returned
commit($c1);        // Commit using c1

select_data($c1);   // No rows returned
select_data($c2);   // No rows returned

drop_table($c1);
echo "</pre>";
?>
]]>
      </programlisting>
     </example>
    </para>
    <note>
     <para>
      This function was renamed to <function>oci_connect</function> 
      after PHP >= 5.0.0. For downward compatibility 
      <function>ocilogon</function> can also be used. 
      This is deprecated, however.
     </para>
    </note>
   </refsect1>
  </refentry>

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