Function.oci-connect

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oci_connect — Establishes a connection to the Oracle server

Beschreibung

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

Returns a connection identifier needed for most other OCI calls.

Parameter-Liste

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

• Wenn Sie den Oracle Server in der Version 9.2 oder höher benutzen, können Sie den Zeichensatz, der für eine neue Verbindung genutzt werden soll, mit dem charset Parameter angeben. Verwenden Sie Oracle in einer Version < 9.2 wird dieser Parameter ignoriert und stattdessen die Umgebungsvariable NLS_LANG benutzt.

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.

Rückgabewerte

Returns a connection identifier or FALSE on error.

Beispiele

Beispiel #1 oci_connect() example

<?php
echo "";
$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 "";
?>

Anmerkungen

Hinweis: 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. Hinweis: 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. Hinweis: 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.

Siehe auch

• oci_pconnect()
• oci_new_connect()
• oci_close()