oci_connect
(PHP 5, PHP 7, PHP 8, PECL OCI8 >= 1.1.0)
Connect to an Oracle database
Description
Returns a connection identifier needed for most other OCI8 operations.
For performance, most applications should use persistent connections with oci_pconnect() instead of oci_connect(). See Connection Handling for general information on connection management and connection pooling.
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 transactions in one handle are also in the other handles, because they use the same underlying database connection. If two handles need to be transactionally isolated from each other, use oci_new_connect() instead.
Parameters
usernameThe Oracle user name.
passwordThe password for
username.connection_stringDb
encodingCharset
session_modeSessionmode
Return Values
Returns a connection identifier or false on error.
Changelog
| Version | Description |
|---|---|
| 8.0.0, PECL OCI8 3.0.0 | connection_string is now nullable. |
Examples
Basic oci_connect() using Easy Connect syntax
<?php
// Connects to the XE service (i.e. database) on the "localhost" machine
$conn = oci_connect('hr', 'welcome', 'localhost/XE');
if (!$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}
$stid = oci_parse($conn, 'SELECT * FROM employees');
oci_execute($stid);
echo "<table border='1'>\n";
while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
echo "<tr>\n";
foreach ($row as $item) {
echo " <td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : " ") . "</td>\n";
}
echo "</tr>\n";
}
echo "</table>\n";
?>Basic oci_connect() using a Network Connect name
<?php
// Connects to the MYDB database described in tnsnames.ora file,
// One example tnsnames.ora entry for MYDB could be:
// MYDB =
// (DESCRIPTION =
// (ADDRESS = (PROTOCOL = TCP)(HOST = mymachine.oracle.com)(PORT = 1521))
// (CONNECT_DATA =
// (SERVER = DEDICATED)
// (SERVICE_NAME = XE)
// )
// )
$conn = oci_connect('hr', 'welcome', 'MYDB');
if (!$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}
$stid = oci_parse($conn, 'SELECT * FROM employees');
oci_execute($stid);
echo "<table border='1'>\n";
while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
echo "<tr>\n";
foreach ($row as $item) {
echo " <td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : " ") . "</td>\n";
}
echo "</tr>\n";
}
echo "</table>\n";
?>oci_connect() with an explicit character set
<?php
$conn = oci_connect('hr', 'welcome', 'localhost/XE', 'AL32UTF8');
if (!$conn) {
$e = oci_error();
trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
}
$stid = oci_parse($conn, 'SELECT * FROM employees');
oci_execute($stid);
echo "<table border='1'>\n";
while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
echo "<tr>\n";
foreach ($row as $item) {
echo " <td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : " ") . "</td>\n";
}
echo "</tr>\n";
}
echo "</table>\n";
?>Using multiple calls to oci_connect()
<?php
$c1 = oci_connect("hr", "welcome", 'localhost/XE');
$c2 = oci_connect("hr", "welcome", 'localhost/XE');
// Both $c1 and $c2 show the same PHP resource id meaning they use the
// same underlying database connection
echo "c1 is $c1<br>\n";
echo "c2 is $c2<br>\n";
function create_table($conn)
{
$stmt = oci_parse($conn, "create table hallo (test varchar2(64))");
oci_execute($stmt);
echo "Created table<br>\n";
}
function drop_table($conn)
{
$stmt = oci_parse($conn, "drop table hallo");
oci_execute($stmt);
echo "Dropped table<br>\n";
}
function insert_data($connname, $conn)
{
$stmt = oci_parse($conn, "insert into hallo
values(to_char(sysdate,'DD-MON-YY HH24:MI:SS'))");
oci_execute($stmt, OCI_DEFAULT);
echo "$connname inserted row without committing<br>\n";
}
function rollback($connname, $conn)
{
oci_rollback($conn);
echo "$connname rollback<br>\n";
}
function select_data($connname, $conn)
{
$stmt = oci_parse($conn, "select * from hallo");
oci_execute($stmt, OCI_DEFAULT);
echo "$connname ----selecting<br>\n";
while (oci_fetch($stmt)) {
echo " " . oci_result($stmt, "TEST") . "<br>\n";
}
echo "$connname ----done<br>\n";
}
create_table($c1);
insert_data('c1', $c1); // Insert a row using c1
sleep(2); // sleep to show a different timestamp for the 2nd row
insert_data('c2', $c2); // Insert a row using c2
select_data('c1', $c1); // Results of both inserts are returned
select_data('c2', $c2); // Results of both inserts are returned
rollback('c1', $c1); // Rollback using c1
select_data('c1', $c1); // Both inserts have been rolled back
select_data('c2', $c2);
drop_table($c1);
// Closing one of the connections makes the PHP variable unusable, but
// the other could be used
oci_close($c1);
echo "c1 is $c1<br>\n";
echo "c2 is $c2<br>\n";
// Output is:
// c1 is Resource id #5
// c2 is Resource id #5
// Created table
// c1 inserted row without committing
// c2 inserted row without committing
// c1 ----selecting
// 09-DEC-09 12:14:43
// 09-DEC-09 12:14:45
// c1 ----done
// c2 ----selecting
// 09-DEC-09 12:14:43
// 09-DEC-09 12:14:45
// c2 ----done
// c1 rollback
// c1 ----selecting
// c1 ----done
// c2 ----selecting
// c2 ----done
// Dropped table
// c1 is
// c2 is Resource id #5
?>Notes
An incorrectly installed or configured OCI8 extension will often manifest itself as a connection problem or error. See Installing/Configuring for troubleshooting information.