PHP Dokumentation: Function oci-new-connect
12. Januar 2010 von werner
oci_new_connect
(PHP 5, PECL OCI8 >= 1.1.0)
oci_new_connect — Connect to the Oracle server using a unique connection
Beschreibung
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.
Parameter-Liste
- username
The Oracle user name.
- password
The password for username.
- connection_string
Containsthe Oracle instance to connect to. It can bean » Easy Connectstring, or a Connect Name fromthe tnsnames.ora file, or the name of a localOracle instance.
If not specified, PHP usesenvironment variables such as TWO_TASK (on Linux)or LOCAL (on Windows)and ORACLE_SID to determine theOracle instance to connect to.
To use the Easy Connect naming method, PHP must be linked with Oracle10g or greater Client libraries. The Easy Connect string for Oracle10g is of the form:[//]host_name[:port][/service_name]. With Oracle11g, the syntax is:[//]host_name[:port][/service_name][:server_type][/instance_name].Service names can be found by running the Oracleutility lsnrctl status on the database servermachine.
The tnsnames.ora file can be in the Oracle Netsearch path, whichincludes $ORACLE_HOME/network/adminand /etc. Alternativelyset TNS_ADMIN sothat $TNS_ADMIN/tnsnames.ora is read. Make surethe web daemon has read access to the file.
- character_set
Wenn Sie den Oracle-Server in der Version 9.2 oderhöher benutzen, können Sie den Zeichensatz, der für eine neue Verbindunggenutzt werden soll, mit dem charset-Parameter angeben.Verwenden Sie Oracle in einer Version < 9.2, wird dieser Parameter ignoriertund stattdessen die Umgebungsvariable NLS_LANG benutzt.
- session_mode
This parameter is available since version PHP 5 (PECL OCI8 1.1) and accepts thefollowing values: OCI_DEFAULT,OCI_SYSOPER and OCI_SYSDBA.If either OCI_SYSOPER orOCI_SYSDBA were specified, this function will tryto establish privileged connection using external credentials. Privileged connections are disabled by default. To enable them youneed to set oci8.privileged_connectto On.
PHP 5.3 (PECL OCI8 1.3.4) introduced theOCI_CRED_EXT mode value. This tells Oracle to useExternal or OS authentication, which must be configured in thedatabase. The OCI_CRED_EXT flag can only be usedwith username of "/" and a empty password.oci8.privileged_connectmay be On or Off.
OCI_CRED_EXT may be combined with theOCI_SYSOPER orOCI_SYSDBA modes.
OCI_CRED_EXT is not supported on Windows forsecurity reasons.
Rückgabewerte
Returns a connection identifier or FALSE on error.
Beispiele
The following demonstrates how you can separate connections.
Beispiel #1 oci_new_connect() example
<?php
echo "<html><pre>";
$db = "";$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 $conn . " <" . oci_result($stmt, "TEST") . ">\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 "</pre></html>";
?>Anmerkungen
Hinweis: In PHP versions before 5.0.0 you must use ocinlogon() instead. The old function name can still be usedin current versions, however it is deprecated and not recommended.
Siehe auch
- oci_connect() – Connect to an Oracle database
- oci_pconnect() – Connect to an Oracle database using a persistent connection
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