/adodb/drivers/adodb-db2.inc.php

<?php

/* 

V4.64 20 June 2005  (c) 2000-2005 John Lim (jlim@natsoft.com.my). All rights reserved.

  Released under both BSD license and Lesser GPL library license. 

  Whenever there is any discrepancy between the two licenses, 

  the BSD license will take precedence. 

Set tabs to 4 for best viewing.

  

  Latest version is available at http://adodb.sourceforge.net

  

  DB2 data driver. Requires ODBC.

 

From phpdb list:



Hi Andrew,



thanks a lot for your help. Today we discovered what

our real problem was:



After "playing" a little bit with the php-scripts that try

to connect to the IBM DB2, we set the optional parameter

Cursortype when calling odbc_pconnect(....).



And the exciting thing: When we set the cursor type

to SQL_CUR_USE_ODBC Cursor Type, then

the whole query speed up from 1 till 10 seconds

to 0.2 till 0.3 seconds for 100 records. Amazing!!!



Therfore, PHP is just almost fast as calling the DB2

from Servlets using JDBC (don't take too much care

about the speed at whole: the database was on a

completely other location, so the whole connection

was made over a slow network connection).



I hope this helps when other encounter the same

problem when trying to connect to DB2 from

PHP.



Kind regards,

Christian Szardenings



2 Oct 2001

Mark Newnham has discovered that the SQL_CUR_USE_ODBC is not supported by 

IBM's DB2 ODBC driver, so this must be a 3rd party ODBC driver.



From the IBM CLI Reference:



SQL_ATTR_ODBC_CURSORS (DB2 CLI v5) 

This connection attribute is defined by ODBC, but is not supported by DB2

CLI. Any attempt to set or get this attribute will result in an SQLSTATE of

HYC00 (Driver not capable). 



A 32-bit option specifying how the Driver Manager uses the ODBC cursor

library. 



So I guess this means the message [above] was related to using a 3rd party

odbc driver.



Setting SQL_CUR_USE_ODBC

========================

To set SQL_CUR_USE_ODBC for drivers that require it, do this:



$db = NewADOConnection('db2');

$db->curMode = SQL_CUR_USE_ODBC;

$db->Connect($dsn, $userid, $pwd);







USING CLI INTERFACE

===================



I have had reports that the $host and $database params have to be reversed in 

Connect() when using the CLI interface. From Halmai Csongor csongor.halmai#nexum.hu:



> The symptom is that if I change the database engine from postgres or any other to DB2 then the following

> connection command becomes wrong despite being described this version to be correct in the docs. 

>

> $connection_object->Connect( $DATABASE_HOST, $DATABASE_AUTH_USER_NAME, $DATABASE_AUTH_PASSWORD, $DATABASE_NAME )

>

> In case of DB2 I had to swap the first and last arguments in order to connect properly. 





*/



// security - hide paths

if (!defined('ADODB_DIR')) die();



if (!defined('_ADODB_ODBC_LAYER')) {

	include(ADODB_DIR."/drivers/adodb-odbc.inc.php");

}

if (!defined('ADODB_DB2')){

define('ADODB_DB2',1);



class ADODB_DB2 extends ADODB_odbc {

	var $databaseType = "db2";	

	var $concat_operator = '||';

	var $sysDate = 'CURRENT_DATE';

	var $sysTimeStamp = 'CURRENT TIMESTAMP';

	// The complete string representation of a timestamp has the form 

	// yyyy-mm-dd-hh.mm.ss.nnnnnn.

	var $fmtTimeStamp = "'Y-m-d-H.i.s'";

	var $ansiOuter = true;

	var $identitySQL = 'values IDENTITY_VAL_LOCAL()';

	var $_bindInputArray = true;

	 var $hasInsertID = true;

	

	function ADODB_DB2()

	{

		if (strncmp(PHP_OS,'WIN',3) === 0) $this->curmode = SQL_CUR_USE_ODBC;

		$this->ADODB_odbc();

	}

	

	function IfNull( $field, $ifNull ) 

	{

		return " COALESCE($field, $ifNull) "; // if DB2 UDB

	}

	

	function ServerInfo()

	{

		//odbc_setoption($this->_connectionID,1,101 /*SQL_ATTR_ACCESS_MODE*/, 1 /*SQL_MODE_READ_ONLY*/);

		$vers = $this->GetOne('select versionnumber from sysibm.sysversions');

		//odbc_setoption($this->_connectionID,1,101, 0 /*SQL_MODE_READ_WRITE*/);

		return array('description'=>'DB2 ODBC driver', 'version'=>$vers);

	}

	

	function _insertid()

	{

		return $this->GetOne($this->identitySQL);

	}

	

	function RowLock($tables,$where,$flds='1 as ignore')

	{

		if ($this->_autocommit) $this->BeginTrans();

		return $this->GetOne("select $flds from $tables where $where for update");

	}

	

	function &MetaTables($ttype=false,$showSchema=false, $qtable="%", $qschema="%")

	{

	global $ADODB_FETCH_MODE;

	

		$savem = $ADODB_FETCH_MODE;

		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;

		$qid = odbc_tables($this->_connectionID, "", $qschema, $qtable, "");

		

		$rs = new ADORecordSet_odbc($qid);

		

		$ADODB_FETCH_MODE = $savem;

		if (!$rs) {

			$false = false;

			return $false;

		}

		$rs->_has_stupid_odbc_fetch_api_change = $this->_has_stupid_odbc_fetch_api_change;

		

		$arr =& $rs->GetArray();

		//print_r($arr);

		

		$rs->Close();

		$arr2 = array();

		

		if ($ttype) {

			$isview = strncmp($ttype,'V',1) === 0;

		}

		for ($i=0; $i < sizeof($arr); $i++) {

		

			if (!$arr[$i][2]) continue;

			if (strncmp($arr[$i][1],'SYS',3) === 0) continue;

			

			$type = $arr[$i][3];

			

			if ($showSchema) $arr[$i][2] = $arr[$i][1].'.'.$arr[$i][2];

			

			if ($ttype) { 

				if ($isview) {

					if (strncmp($type,'V',1) === 0) $arr2[] = $arr[$i][2];

				} else if (strncmp($type,'T',1) === 0) $arr2[] = $arr[$i][2];

			} else if (strncmp($type,'S',1) !== 0) $arr2[] = $arr[$i][2];

		}

		return $arr2;

	}



	function &MetaIndexes ($table, $primary = FALSE, $owner=false)

	{

        // save old fetch mode

        global $ADODB_FETCH_MODE;

        $save = $ADODB_FETCH_MODE;

        $ADODB_FETCH_MODE = ADODB_FETCH_NUM;

        if ($this->fetchMode !== FALSE) {

               $savem = $this->SetFetchMode(FALSE);

        }

		$false = false;

		// get index details

		$table = strtoupper($table);

		$SQL="SELECT NAME, UNIQUERULE, COLNAMES FROM SYSIBM.SYSINDEXES WHERE TBNAME='$table'";

        if ($primary) 

			$SQL.= " AND UNIQUERULE='P'";

		$rs = $this->Execute($SQL);

        if (!is_object($rs)) {

			if (isset($savem)) 

				$this->SetFetchMode($savem);

			$ADODB_FETCH_MODE = $save;

            return $false;

        }

		$indexes = array ();

        // parse index data into array

        while ($row = $rs->FetchRow()) {

			$indexes[$row[0]] = array(

			   'unique' => ($row[1] == 'U' || $row[1] == 'P'),

			   'columns' => array()

			);

			$cols = ltrim($row[2],'+');

			$indexes[$row[0]]['columns'] = explode('+', $cols);

        }

		if (isset($savem)) { 

            $this->SetFetchMode($savem);

			$ADODB_FETCH_MODE = $save;

		}

        return $indexes;

	}

	

	// Format date column in sql string given an input format that understands Y M D

	function SQLDate($fmt, $col=false)

	{	

	// use right() and replace() ?

		if (!$col) $col = $this->sysDate;

		$s = '';

		

		$len = strlen($fmt);

		for ($i=0; $i < $len; $i++) {

			if ($s) $s .= '||';

			$ch = $fmt[$i];

			switch($ch) {

			case 'Y':

			case 'y':

				$s .= "char(year($col))";

				break;

			case 'M':

				$s .= "substr(monthname($col),1,3)";

				break;

			case 'm':

				$s .= "right(digits(month($col)),2)";

				break;

			case 'D':

			case 'd':

				$s .= "right(digits(day($col)),2)";

				break;

			case 'H':

			case 'h':

				if ($col != $this->sysDate) $s .= "right(digits(hour($col)),2)";	

				else $s .= "''";

				break;

			case 'i':

			case 'I':

				if ($col != $this->sysDate)

					$s .= "right(digits(minute($col)),2)";

					else $s .= "''";

				break;

			case 'S':

			case 's':

				if ($col != $this->sysDate)

					$s .= "right(digits(second($col)),2)";

				else $s .= "''";

				break;

			default:

				if ($ch == '\\') {

					$i++;

					$ch = substr($fmt,$i,1);

				}

				$s .= $this->qstr($ch);

			}

		}

		return $s;

	} 

 

	

	function &SelectLimit($sql,$nrows=-1,$offset=-1,$inputArr=false)

	{

		if ($offset <= 0) {

		// could also use " OPTIMIZE FOR $nrows ROWS "

			if ($nrows >= 0) $sql .=  " FETCH FIRST $nrows ROWS ONLY ";

			$rs =& $this->Execute($sql,$inputArr);

		} else {

			if ($offset > 0 && $nrows < 0);

			else {

				$nrows += $offset;

				$sql .=  " FETCH FIRST $nrows ROWS ONLY ";

			}

			$rs =& ADOConnection::SelectLimit($sql,-1,$offset,$inputArr);

		}

		

		return $rs;

	}

	

};

 



class  ADORecordSet_db2 extends ADORecordSet_odbc {	

	

	var $databaseType = "db2";		

	

	function ADORecordSet_db2($id,$mode=false)

	{

		$this->ADORecordSet_odbc($id,$mode);

	}



	function MetaType($t,$len=-1,$fieldobj=false)

	{

		if (is_object($t)) {

			$fieldobj = $t;

			$t = $fieldobj->type;

			$len = $fieldobj->max_length;

		}

		

		switch (strtoupper($t)) {

		case 'VARCHAR':

		case 'CHAR':

		case 'CHARACTER':

		case 'C':

			if ($len <= $this->blobSize) return 'C';

		

		case 'LONGCHAR':

		case 'TEXT':

		case 'CLOB':

		case 'DBCLOB': // double-byte

		case 'X':

			return 'X';

		

		case 'BLOB':

		case 'GRAPHIC':

		case 'VARGRAPHIC':

			return 'B';

			

		case 'DATE':

		case 'D':

			return 'D';

		

		case 'TIME':

		case 'TIMESTAMP':

		case 'T':

			return 'T';

		

		//case 'BOOLEAN': 

		//case 'BIT':

		//	return 'L';

			

		//case 'COUNTER':

		//	return 'R';

			

		case 'INT':

		case 'INTEGER':

		case 'BIGINT':

		case 'SMALLINT':

		case 'I':

			return 'I';

			

		default: return 'N';

		}

	}

}



} //define

?>