Compzone.Org :: Podręcznik PHP :: oci_connect

Podręcznik PHP
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oci_connect

(PHP 5)

oci_connect -- Establishes a connection to the Oracle server

Description

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

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.

Parameter session_mode 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, oci_connect() 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.

Notatka: 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.

Notatka: 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.

Używając serwera Oracle w wersji 9.2 lub nowszej można podać parametr charset, który zostanie użyty przy nowym połączeniu. Używając serwera Oracle < 9.2 ten parametr zostanie zignorowany, a zamiast niego użyta zostanie zmienna środowiskowa NLS_LANG.

Przykład 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>";
?>

oci_connect() returns FALSE if an error occured.

Notatka: 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.

Poprzedni	Spis treści	Następny
oci_commit	Początek rozdziału	oci_define_by_name