oci_connect
(PHP 5)
oci_connect -- Establishes a connection to Oracle server
Description
resource
oci_connect ( string username, string password [, string db [, string charset]] )
oci_connect() 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 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.
Note:
oci_connect() does not reestablish
the connection, if a connection with such parameters was established
before. In this case, oci_connect() 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 oci_new_connect().
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.
Example 1. 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>";
?>
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oci_connect() returns FALSE if an error occured.
Note:
In PHP versions before 5.0.0 you must use ocilogon() instead.
This name still can be used, it was left as alias of
oci_connect() for downwards compatability.
This, however, is deprecated and not recommended.
See also oci_pconnect() and
oci_new_connect().