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oci_new_connect

(PHP 5)

oci_new_connect -- Establishes a new connection to the Oracle server

Description

resource oci_new_connect ( string username, string password [, string db [, string charset [, int session_mode]]] )

Establishes a new connection to an Oracle server and logs on.

Unlike oci_connect() and oci_pconnect(), oci_new_connect() does not cache connections and will always return a brand-new freshly opened connection handle. This is useful if your application needs transactional isolation between two sets of queries.

Parameters

username

The Oracle user name.

password

The password for username.

db

This optional parameter can either contain the name of the local Oracle instance or the name of the entry in tnsnames.ora.

If the not specified, PHP uses environment variables ORACLE_SID and TWO_TASK to determine the name of local Oracle instance and location of tnsnames.ora accordingly.

charset

Using Oracle server version 9.2 and greater, you can indicate charset parameter, which will be used in the new connection. If you're using Oracle server < 9.2, this parameter will be ignored and NLS_LANG environment variable will be used instead.

session_mode

This parameter is available since version 1.1 and accepts the following values: OCI_DEFAULT, OCI_SYSOPER and OCI_SYSDBA. If either OCI_SYSOPER or OCI_SYSDBA were specified, this function will try to establish privileged connection using external credentials. Privileged connections are disabled by default. To enable them you need to set oci8.privileged_connect to On.

Return Values

Returns a connection identifier or FALSE on error.

Examples

The following demonstrates how you can separate connections.

Example 1. oci_new_connect() example

&#60;?php
echo "&#60;html&#62;&#60;pre&#62;";
$db = "";

$c1 = oci_connect("scott", "tiger", $db);
$c2 = oci_new_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 $conn . " &#60;" . oci_result($stmt, "TEST") . "&#62;\n\n";
  }
  echo $conn . "----done\n\n";
}

create_table($c1);
insert_data($c1);

select_data($c1);
select_data($c2);

rollback($c1);

select_data($c1);
select_data($c2);

insert_data($c2);
commit($c2);

select_data($c1);

delete_data($c1);
select_data($c1);
select_data($c2);
commit($c1);

select_data($c1);
select_data($c2);

drop_table($c1);
echo "&#60;/pre&#62;&#60;/html&#62;";
?&#62;

Notes

Note: If you're using PHP with Oracle Instant Client, you can use easy connect naming method described here: http://download-west.oracle.com/docs/cd/B12037_01/network.101/b10775/naming.htm#i498306. Basically this means you can specify "//db_host[:port]/database_name" as database name. But if you want to use the old way of naming you must set either ORACLE_HOME or TNS_ADMIN.

Note: In PHP versions before 5.0.0 you must use ocinlogon() instead. This name still can be used, it was left as alias of oci_new_connect() for downwards compatability. This, however, is deprecated and not recommended.

See Also

oci_connect()
oci_pconnect()

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