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oci_connect
Establishes a connection to the Oracle server
(PHP 5, PECL oci8:1.1-1.2.4)
resource oci_connect ( string username, string password [, string db [, string charset [, int session_mode]]] )
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_SIDandTWO_TASKto determine the name of local Oracle instance and location oftnsnames.oraaccordingly.- 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_SYSOPERandOCI_SYSDBA. If eitherOCI_SYSOPERorOCI_SYSDBAwere 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 toOn.
Examples
Example 1637. oci_connect() example
<?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>";
?>
Notes
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.
The second and subsequent calls to oci_connect() with the same parameters will return the connection handle returned from the first call. This means that queries issued against one handle are also applied to the other handles, because they are the same handle. This behaviour is demonstrated in Example 1 below. If you require two handles to be transactionally isolated from each other, you should use oci_new_connect() instead.
In PHP versions before 5.0.0 you must use ocilogon() instead. This name still can be used, it was left as the alias of oci_connect() for downwards compatability. This, however, is deprecated and not recommended.