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# ocilogon

(PHP 3>= 3.0.4, PHP 4 , PHP 5)

ocilogon -- Establishes a connection to Oracle

## Description

resource ocilogon ( string username, string password [, string db [, string charset]])

ocilogon() returns an 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.

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.

Connections are shared at the page level when using ocilogon(). This means that commits and rollbacks apply to all open transactions in the page, even if you have created multiple connections.

This example demonstrates how the connections are shared.

示範 1.ocilogon() example
`<?php echo "<pre>"; $db = ""; $c1 = ocilogon("scott", "tiger", $db); $c2 = ocilogon("scott", "tiger", $db); function create_table($conn) { $stmt = ociparse($conn, "create table scott.hallo (test varchar2(64))"); ociexecute($stmt); echo $conn . " created table\n\n"; } function drop_table($conn) { $stmt = ociparse($conn, "drop table scott.hallo"); ociexecute($stmt); echo $conn . " dropped table\n\n"; } function insert_data($conn) { $stmt = ociparse($conn, "insert into scott.hallo values('$conn' || ' ' || to_char(sysdate,'DD-MON-YY HH24:MI:SS'))"); ociexecute($stmt, OCI_DEFAULT); echo $conn . " inserted hallo\n\n"; } function delete_data($conn) { $stmt = ociparse($conn, "delete from scott.hallo"); ociexecute($stmt, OCI_DEFAULT); echo $conn . " deleted hallo\n\n"; } function commit($conn) { ocicommit($conn); echo $conn . " committed\n\n"; } function rollback($conn) { ocirollback($conn); echo $conn . " rollback\n\n"; } function select_data($conn) { $stmt = ociparse($conn, "select * from scott.hallo"); ociexecute($stmt, OCI_DEFAULT); echo $conn."----selecting\n\n"; while (ocifetch($stmt)) { echo $conn . " [" . ociresult($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>"; ?>`

> 備注: This function was renamed to oci_connect() after PHP >= 5.0.0. For downward compatibility ocilogon() can also be used. This is deprecated, however.

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