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# OCILogon

(3.0.4 - 3.0.18 only, PHP 4 >= 4.0.0)

OCILogon -- Establishes a connection to Oracle

## Description

``int OCILogon` (string username, string password [, string db])`

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.

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.

Example 1. OCILogon
    <?php
    print "<HTML><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);
    print "</PRE></HTML>";
    ?>

See also OCIPLogon() and OCINLogon().

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