OCI_CONNECT(3)															    OCI_CONNECT(3)

oci_connect - Connect to an Oracle database

SYNOPSIS

       resource oci_connect (string  $username, string	$password, [string  $connection_string], [string  $character_set], [int  $session_mode])

DESCRIPTION

	Returns a connection identifier needed for most other OCI8 operations.

	See Connection Handling for general information on connection management and connection pooling.

	From PHP 5.1.2 (PECL OCI8 1.1) oci_close(3) can be used to close the connection.

	The second and subsequent calls to oci_connect(3) with the same parameters will return the connection handle returned from the first call.
       This means that transactions in one handle are also in the other handles, because they use the same underlying database connection. If  two
       handles need to be transactionally isolated from each other, use oci_new_connect(3) instead.

PARAMETERS

	      o $username
		- The Oracle user name.

	      o $password
		- The password for $username.

	      o $connection_string
		-Contains  the	Oracle	instance to connect to. It can be an Easy Connect string, or a Connect Name from the tnsnames.ora file, or
		the name of a local Oracle instance. If not specified, PHP uses environment variables such as TWO_TASK (on  Linux)  or	LOCAL  (on
		Windows) and ORACLE_SID to determine the Oracle instance to connect to.  To use the Easy Connect naming method, PHP must be linked
		with Oracle 10 g or greater Client libraries. The Easy Connect string for Oracle 10 g is of the  form:	[//]host_name[:port][/ser-
		vice_name].  From Oracle 11 g, the syntax is: [//]host_name[:port][/service_name][:server_type][/instance_name]. Service names can
		be found by running the Oracle utility lsnrctl status on the database server machine.  The tnsnames.ora file can be in the  Oracle
		Net  search  path, which includes $ORACLE_HOME/network/admin and /etc. Alternatively set TNS_ADMIN so that $TNS_ADMIN/tnsnames.ora
		is read. Make sure the web daemon has read access to the file.

	      o $character_set
		-Determines the character set used by the Oracle Client libraries. The character set does not need to match the character set used
		by the database. If it doesn't match, Oracle will do its best to convert data to and from the database character set. Depending on
		the character sets this may not give usable results. Conversion also adds some time overhead. If not specified, the Oracle  Client
		libraries  determine  a  character set from the NLS_LANG environment variable. Passing this parameter can reduce the time taken to
		connect.

	      o $session_mode
		-This parameter is available since version PHP 5 (PECL OCI8 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.   PHP  5.3	(PECL  OCI8 1.3.4) introduced the OCI_CRED_EXT mode value. This tells Oracle to use External or OS authentication,
		which must be configured in the database. The OCI_CRED_EXT flag can only be used with  username  of  "/"  and  a  empty  password.
		oci8.privileged_connect may be On or Off.  OCI_CRED_EXT may be combined with the OCI_SYSOPER or OCI_SYSDBA modes.  OCI_CRED_EXT is
		not supported on Windows for security reasons.

RETURN VALUES

	Returns a connection identifier or FALSE on error.

EXAMPLES

       Example #1

	      Basic oci_connect(3) using Easy Connect syntax

	      <?php

	      // Connects to the XE service (i.e. database) on the "localhost" machine
	      $conn = oci_connect('hr', 'welcome', 'localhost/XE');
	      if (!$conn) {
		  $e = oci_error();
		  trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
	      }

	      $stid = oci_parse($conn, 'SELECT * FROM employees');
	      oci_execute($stid);

	      echo "<table border='1'>
";
	      while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
		  echo "<tr>
";
		  foreach ($row as $item) {
		      echo "	<td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : "&nbsp;") . "</td>
";
		  }
		  echo "</tr>
";
	      }
	      echo "</table>
";

	      ?>

       Example #2

	      Basic oci_connect(3) using a Network Connect name

	      <?php

	      // Connects to the MYDB database described in tnsnames.ora file,
	      // One example tnsnames.ora entry for MYDB could be:
	      //   MYDB =
	      //     (DESCRIPTION =
	      //       (ADDRESS = (PROTOCOL = TCP)(HOST = mymachine.oracle.com)(PORT = 1521))
	      //       (CONNECT_DATA =
	      //	 (SERVER = DEDICATED)
	      //	 (SERVICE_NAME = XE)
	      //       )
	      //     )

	      $conn = oci_connect('hr', 'welcome', 'MYDB');
	      if (!$conn) {
		  $e = oci_error();
		  trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
	      }

	      $stid = oci_parse($conn, 'SELECT * FROM employees');
	      oci_execute($stid);

	      echo "<table border='1'>
";
	      while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
		  echo "<tr>
";
		  foreach ($row as $item) {
		      echo "	<td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : "&nbsp;") . "</td>
";
		  }
		  echo "</tr>
";
	      }
	      echo "</table>
";

	      ?>

       Example #3

	      oci_connect(3) with an explicit character set

	      <?php

	      $conn = oci_connect('hr', 'welcome', 'localhost/XE', 'AL32UTF8');
	      if (!$conn) {
		  $e = oci_error();
		  trigger_error(htmlentities($e['message'], ENT_QUOTES), E_USER_ERROR);
	      }

	      $stid = oci_parse($conn, 'SELECT * FROM employees');
	      oci_execute($stid);

	      echo "<table border='1'>
";
	      while ($row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS)) {
		  echo "<tr>
";
		  foreach ($row as $item) {
		      echo "	<td>" . ($item !== null ? htmlentities($item, ENT_QUOTES) : "&nbsp;") . "</td>
";
		  }
		  echo "</tr>
";
	      }
	      echo "</table>
";

	      ?>

       Example #4

	      Using multiple calls to oci_connect(3)

	      <?php

	      $c1 = oci_connect("hr", "welcome", 'localhost/XE');
	      $c2 = oci_connect("hr", "welcome", 'localhost/XE');

	      // Both $c1 and $c2 show the same PHP resource id meaning they use the
	      // same underlying database connection
	      echo "c1 is $c1<br>
";
	      echo "c2 is $c2<br>
";

	      function create_table($conn)
	      {
		  $stmt = oci_parse($conn, "create table hallo (test varchar2(64))");
		  oci_execute($stmt);
		  echo "Created table<br>
";
	      }

	      function drop_table($conn)
	      {
		  $stmt = oci_parse($conn, "drop table hallo");
		  oci_execute($stmt);
		  echo "Dropped table<br>
";
	      }

	      function insert_data($connname, $conn)
	      {
		  $stmt = oci_parse($conn, "insert into hallo
			    values(to_char(sysdate,'DD-MON-YY HH24:MI:SS'))");
		  oci_execute($stmt, OCI_DEFAULT);
		  echo "$connname inserted row without committing<br>
";
	      }

	      function rollback($connname, $conn)
	      {
		  oci_rollback($conn);
		  echo "$connname rollback<br>
";
	      }

	      function select_data($connname, $conn)
	      {
		  $stmt = oci_parse($conn, "select * from hallo");
		  oci_execute($stmt, OCI_DEFAULT);
		  echo "$connname ----selecting<br>
";
		  while (oci_fetch($stmt)) {
		      echo "	" . oci_result($stmt, "TEST") . "<br>
";
		  }
		  echo "$connname ----done<br>
";
	      }

	      create_table($c1);

	      insert_data('c1', $c1);	// Insert a row using c1
	      sleep(2); 		// sleep to show a different timestamp for the 2nd row
	      insert_data('c2', $c2);	// Insert a row using c2

	      select_data('c1', $c1);	// Results of both inserts are returned
	      select_data('c2', $c2);	// Results of both inserts are returned

	      rollback('c1', $c1);	// Rollback using c1

	      select_data('c1', $c1);	// Both inserts have been rolled back
	      select_data('c2', $c2);

	      drop_table($c1);

	      // Closing one of the connections makes the PHP variable unusable, but
	      // the other could be used
	      oci_close($c1);
	      echo "c1 is $c1<br>
";
	      echo "c2 is $c2<br>
";

	      // Output is:
	      //    c1 is Resource id #5
	      //    c2 is Resource id #5
	      //    Created table
	      //    c1 inserted row without committing
	      //    c2 inserted row without committing
	      //    c1 ----selecting
	      //	09-DEC-09 12:14:43
	      //	09-DEC-09 12:14:45
	      //    c1 ----done
	      //    c2 ----selecting
	      //	09-DEC-09 12:14:43
	      //	09-DEC-09 12:14:45
	      //    c2 ----done
	      //    c1 rollback
	      //    c1 ----selecting
	      //    c1 ----done
	      //    c2 ----selecting
	      //    c2 ----done
	      //    Dropped table
	      //    c1 is
	      //    c2 is Resource id #5

	      ?>

NOTES

       Note

	       An incorrectly installed or configured  OCI8  extension	will  often  manifest  itself  as  a  connection  problem  or  error.  See
	      Installing/Configuring for troubleshooting information.

SEE ALSO

       oci_pconnect(3), oci_new_connect(3), oci_close(3).

PHP Documentation Group 													    OCI_CONNECT(3)