php-doc-en/reference/oci8/functions/oci-connect.xml

<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.6 $ -->
  <refentry id="function.oci-connect">
   <refnamediv>
    <refname>oci_connect</refname>
    <refpurpose>Establishes a connection to Oracle server</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>resource</type><methodname>oci_connect</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>oci_connect</function> returns a 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 <filename>tnsnames.ora</filename> to which 
     you want to connect.
     If the optional third parameter is not specified, PHP uses the
     environment variables <constant>ORACLE_SID</constant> (Oracle 
     instance) or <constant>TWO_TASK</constant>
     (<filename>tnsnames.ora</filename>) to determine which database 
     to connect to.
    </para>
    <note>
     <simpara>
      <function>oci_connect</function> <emphasis>does not</emphasis> reestablish
      the connection, if a connection with such parameters was established
      before. In this case, <function>oci_connect</function> will return
      identifier of previously opened connection. This means, that you cannot
      use this function to separate transactions. To establish a distinctly new
      connection, use <function>oci_new_connect</function>.
     </simpara>
    </note>
    &oci.charset;
    <para>
     <example>
      <title><function>oci_connect</function> example</title>
      <programlisting role="php">
<![CDATA[
<?php
echo "<pre>";
$db = "";

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

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

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

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

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

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

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

function select_data($conn) 
{
  $stmt = oci_parse($conn, "select * from scott.hallo");
  oci_execute($stmt, OCI_DEFAULT);
  echo $conn."----selecting\n\n";
  while (oci_fetch($stmt)) {
    echo $conn . " [" . oci_result($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>
    <para>
     <function>oci_connect</function> returns &false; if an error occured.
    </para>
    <note>
     <para>
      In PHP versions before 5.0.0 you must use <function>ocilogon</function> instead. 
      This name still can be used, it was left as alias of
      <function>oci_connect</function> for downwards compatability. 
      This, however, is deprecated and not recommended.
     </para>
    </note>    <simpara>
     See also <function>oci_pconnect</function> and
     <function>oci_new_connect</function>.
    </simpara>
   </refsect1>
  </refentry>

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