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<?php

/* 

  V4.80 8 Mar 2006  (c) 2006 John Lim (jlim@natsoft.com.my). All rights reserved.

This is a version of the ADODB driver for DB2.  It uses the 'ibm_db2' PECL extension for PHP

  (http://pecl.php.net/package/ibm_db2), which in turn requires DB2 V8.2.2.

  Tested with PHP 5.1.1 and Apache 2.0.55 on Windows XP SP2.

  This file was ported from "adodb-odbc.inc.php" by Larry Menard, "larry.menard@rogers.com".

  I ripped out what I believed to be a lot of redundant or obsolete code, but there are

  probably still some remnants of the ODBC support in this file; I'm relying on reviewers

  of this code to point out any other things that can be removed.

*/

// security - hide paths

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

  define("_ADODB_DB2_LAYER", 2 );

/*--------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------*/

class ADODB_db2 extends ADOConnection {

	var $databaseType = "db2";	

	var $fmtDate = "'Y-m-d'";

	var $fmtTimeStamp = "'Y-m-d, h:i:sA'";

	var $replaceQuote = "''"; // string to use to replace quotes

	var $dataProvider = "db2";

	var $hasAffectedRows = true;

	var $binmode = DB2_BINARY;

	var $useFetchArray = false; // setting this to true will make array elements in FETCH_ASSOC mode case-sensitive

								// breaking backward-compat

	var $_bindInputArray = false;	

	var $_genSeqSQL = "create table %s (id integer)";

	var $_autocommit = true;

	var $_haserrorfunctions = true;

	var $_lastAffectedRows = 0;

	var $uCaseTables = true; // for meta* functions, uppercase table names

	function ADODB_db2() 

	{ 	

		$this->_haserrorfunctions = ADODB_PHPVER >= 0x4050;

	}

		// returns true or false

	function _connect($argDSN, $argUsername, $argPassword, $argDatabasename)

	{

		global $php_errormsg;

		if (!function_exists('db2_connect')) {

			ADOConnection::outp("Warning: The old ODBC based DB2 driver has been renamed 'odbc_db2'. This ADOdb driver calls PHP's native db2 extension.");

			return null;

		}

		// This needs to be set before the connect().

		// Replaces the odbc_binmode() call that was in Execute()

		ini_set('ibm_db2.binmode', $this->binmode);

		if ($argDatabasename) {

			$this->_connectionID = db2_connect($argDatabasename,$argUsername,$argPassword);

		} else {

			$this->_connectionID = db2_connect($argDSN,$argUsername,$argPassword);

		}

		if (isset($php_errormsg)) $php_errormsg = '';

		// For db2_connect(), there is an optional 4th arg.  If present, it must be

		// an array of valid options.  So far, we don't use them.

		$this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';

		if (isset($this->connectStmt)) $this->Execute($this->connectStmt);

		return $this->_connectionID != false;

	}

	// returns true or false

	function _pconnect($argDSN, $argUsername, $argPassword, $argDatabasename)

	{

		global $php_errormsg;

		if (!function_exists('db2_connect')) return null;

		// This needs to be set before the connect().

		// Replaces the odbc_binmode() call that was in Execute()

		ini_set('ibm_db2.binmode', $this->binmode);

		if (isset($php_errormsg)) $php_errormsg = '';

		$this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';

		if ($argDatabasename) {

			$this->_connectionID = db2_pconnect($argDatabasename,$argUsername,$argPassword);

		} else {

			$this->_connectionID = db2_pconnect($argDSN,$argUsername,$argPassword);

		}

		if (isset($php_errormsg)) $php_errormsg = '';

		$this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';

		if ($this->_connectionID && $this->autoRollback) @db2_rollback($this->_connectionID);

		if (isset($this->connectStmt)) $this->Execute($this->connectStmt);

		return $this->_connectionID != false;

	}

	function ServerInfo()

	{

		if (!empty($this->host) && ADODB_PHPVER >= 0x4300) {

			$dsn = strtoupper($this->host);

			$first = true;

			$found = false;

			if (!function_exists('db2_data_source')) return false;

			while(true) {

				$rez = @db2_data_source($this->_connectionID,

					$first ? SQL_FETCH_FIRST : SQL_FETCH_NEXT);

				$first = false;

				if (!is_array($rez)) break;

				if (strtoupper($rez['server']) == $dsn) {

					$found = true;

					break;

				}

			} 

			if (!$found) return ADOConnection::ServerInfo();

			if (!isset($rez['version'])) $rez['version'] = '';

			return $rez;

		} else {

			return ADOConnection::ServerInfo();

		}

	}

	function CreateSequence($seqname='adodbseq',$start=1)

	{

		if (empty($this->_genSeqSQL)) return false;

		$ok = $this->Execute(sprintf($this->_genSeqSQL,$seqname));

		if (!$ok) return false;

		$start -= 1;

		return $this->Execute("insert into $seqname values($start)");

	}

	var $_dropSeqSQL = 'drop table %s';

	function DropSequence($seqname)

	{

		if (empty($this->_dropSeqSQL)) return false;

		return $this->Execute(sprintf($this->_dropSeqSQL,$seqname));

	}

	/*

		This algorithm is not very efficient, but works even if table locking

		is not available.

		Will return false if unable to generate an ID after $MAXLOOPS attempts.

	*/

	function GenID($seq='adodbseq',$start=1)

	{	

		// if you have to modify the parameter below, your database is overloaded,

		// or you need to implement generation of id's yourself!

		$MAXLOOPS = 100;

		while (--$MAXLOOPS>=0) {

			$num = $this->GetOne("select id from $seq");

			if ($num === false) {

				$this->Execute(sprintf($this->_genSeqSQL ,$seq));	

				$start -= 1;

				$num = '0';

				$ok = $this->Execute("insert into $seq values($start)");

				if (!$ok) return false;

			} 

			$this->Execute("update $seq set id=id+1 where id=$num");

			if ($this->affected_rows() > 0) {

				$num += 1;

				$this->genID = $num;

				return $num;

			}

		}

		if ($fn = $this->raiseErrorFn) {

			$fn($this->databaseType,'GENID',-32000,"Unable to generate unique id after $MAXLOOPS attempts",$seq,$num);

		}

		return false;

	}

	function ErrorMsg()

	{

		if ($this->_haserrorfunctions) {

			if ($this->_errorMsg !== false) return $this->_errorMsg;

			if (empty($this->_connectionID)) return @db2_errormsg();

			return @db2_errormsg($this->_connectionID);

		} else return ADOConnection::ErrorMsg();

	}

	function ErrorNo()

	{

		if ($this->_haserrorfunctions) {

			if ($this->_errorCode !== false) {

				// bug in 4.0.6, error number can be corrupted string (should be 6 digits)

				return (strlen($this->_errorCode)<=2) ? 0 : $this->_errorCode;

			}

			if (empty($this->_connectionID)) $e = @db2_error(); 

			else $e = @db2_error($this->_connectionID);

			 // bug in 4.0.6, error number can be corrupted string (should be 6 digits)

			 // so we check and patch

			if (strlen($e)<=2) return 0;

			return $e;

		} else return ADOConnection::ErrorNo();

	}

	function BeginTrans()

	{	

		if (!$this->hasTransactions) return false;

		if ($this->transOff) return true; 

		$this->transCnt += 1;

		$this->_autocommit = false;

		return db2_autocommit($this->_connectionID,false);

	}

	function CommitTrans($ok=true) 

	{ 

		if ($this->transOff) return true; 

		if (!$ok) return $this->RollbackTrans();

		if ($this->transCnt) $this->transCnt -= 1;

		$this->_autocommit = true;

		$ret = db2_commit($this->_connectionID);

		db2_autocommit($this->_connectionID,true);

		return $ret;

	}

	function RollbackTrans()

	{

		if ($this->transOff) return true; 

		if ($this->transCnt) $this->transCnt -= 1;

		$this->_autocommit = true;

		$ret = db2_rollback($this->_connectionID);

		db2_autocommit($this->_connectionID,true);

		return $ret;

	}

	function MetaPrimaryKeys($table)

	{

	global $ADODB_FETCH_MODE;

		if ($this->uCaseTables) $table = strtoupper($table);

		$schema = '';

		$this->_findschema($table,$schema);

		$savem = $ADODB_FETCH_MODE;

		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;

		$qid = @db2_primarykeys($this->_connectionID,'',$schema,$table);

		if (!$qid) {

			$ADODB_FETCH_MODE = $savem;

			return false;

		}

		$rs = new ADORecordSet_db2($qid);

		$ADODB_FETCH_MODE = $savem;

		if (!$rs) return false;

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

		$rs->Close();

		$arr2 = array();

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

			if ($arr[$i][3]) $arr2[] = $arr[$i][3];

		}

		return $arr2;

	}

	function &MetaTables($ttype=false)

	{

	global $ADODB_FETCH_MODE;

		$savem = $ADODB_FETCH_MODE;

		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;

		$qid = db2_tables($this->_connectionID);

		$rs = new ADORecordSet_db2($qid);

		$ADODB_FETCH_MODE = $savem;

		if (!$rs) {

			$false = false;

			return $false;

		}

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

		$rs->Close();

		$arr2 = array();

		if ($ttype) {

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

		}

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

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

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

			if ($ttype) { 

				if ($isview) {

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

				} else if (strncmp($type,'SYS',3) !== 0) $arr2[] = $arr[$i][2];

			} else if (strncmp($type,'SYS',3) !== 0) $arr2[] = $arr[$i][2];

		}

		return $arr2;

	}

/*

See http://msdn.microsoft.com/library/default.asp?url=/library/en-us/db2/htm/db2datetime_data_type_changes.asp

/ SQL data type codes /

#define	SQL_UNKNOWN_TYPE	0

#define SQL_CHAR			1

#define SQL_NUMERIC		 2

#define SQL_DECIMAL		 3

#define SQL_INTEGER		 4

#define SQL_SMALLINT		5

#define SQL_FLOAT		   6

#define SQL_REAL			7

#define SQL_DOUBLE		  8

#if (DB2VER >= 0x0300)

#define SQL_DATETIME		9

#endif

#define SQL_VARCHAR		12

/ One-parameter shortcuts for date/time data types /

#if (DB2VER >= 0x0300)

#define SQL_TYPE_DATE	  91

#define SQL_TYPE_TIME	  92

#define SQL_TYPE_TIMESTAMP 93

#define SQL_UNICODE                             (-95)

#define SQL_UNICODE_VARCHAR                     (-96)

#define SQL_UNICODE_LONGVARCHAR                 (-97)

*/

	function DB2Types($t)

	{

		switch ((integer)$t) {

		case 1:	

		case 12:

		case 0:

		case -95:

		case -96:

			return 'C';

		case -97:

		case -1: //text

			return 'X';

		case -4: //image

			return 'B';

		case 9:	

		case 91:

			return 'D';

		case 10:

		case 11:

		case 92:

		case 93:

			return 'T';

		case 4:

		case 5:

		case -6:

			return 'I';

		case -11: // uniqidentifier

			return 'R';

		case -7: //bit

			return 'L';

		default:

			return 'N';

		}

	}

	function &MetaColumns($table)

	{

	global $ADODB_FETCH_MODE;

		$false = false;

		if ($this->uCaseTables) $table = strtoupper($table);

		$schema = '';

		$this->_findschema($table,$schema);

		$savem = $ADODB_FETCH_MODE;

		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;

        	$colname = "%";

	        $qid = db2_columns($this->_connectionID, "", $schema, $table, $colname);

		if (empty($qid)) return $false;

		$rs =& new ADORecordSet_db2($qid);

		$ADODB_FETCH_MODE = $savem;

		if (!$rs) return $false;

		$rs->_fetch();

		$retarr = array();

		/*

		$rs->fields indices

		1 TABLE_SCHEM

		2 TABLE_NAME

		3 COLUMN_NAME

		4 DATA_TYPE

		5 TYPE_NAME

		6 PRECISION

		7 LENGTH

		8 SCALE

		9 RADIX

		10 NULLABLE

		11 REMARKS

		*/

		while (!$rs->EOF) {

			if (strtoupper(trim($rs->fields[2])) == $table && (!$schema || strtoupper($rs->fields[1]) == $schema)) {

				$fld = new ADOFieldObject();

				$fld->name = $rs->fields[3];

				$fld->type = $this->DB2Types($rs->fields[4]);

				// ref: http://msdn.microsoft.com/library/default.asp?url=/archive/en-us/dnaraccgen/html/msdn_odk.asp

				// access uses precision to store length for char/varchar

				if ($fld->type == 'C' or $fld->type == 'X') {

					if ($rs->fields[4] <= -95) // UNICODE

						$fld->max_length = $rs->fields[7]/2;

					else

						$fld->max_length = $rs->fields[7];

				} else 

					$fld->max_length = $rs->fields[7];

				$fld->not_null = !empty($rs->fields[10]);

				$fld->scale = $rs->fields[8];

				$retarr[strtoupper($fld->name)] = $fld;	

			} else if (sizeof($retarr)>0)

				break;

			$rs->MoveNext();

		}

		$rs->Close(); //-- crashes 4.03pl1 -- why?

		if (empty($retarr)) $retarr = false;

		return $retarr;

	}

	function Prepare($sql)

	{

		if (! $this->_bindInputArray) return $sql; // no binding

		$stmt = db2_prepare($this->_connectionID,$sql);

		if (!$stmt) {

			// we don't know whether db2 driver is parsing prepared stmts, so just return sql

			return $sql;

		}

		return array($sql,$stmt,false);

	}

	/* returns queryID or false */

	function _query($sql,$inputarr=false) 

	{

	GLOBAL $php_errormsg;

		if (isset($php_errormsg)) $php_errormsg = '';

		$this->_error = '';

		if ($inputarr) {

			if (is_array($sql)) {

				$stmtid = $sql[1];

			} else {

				$stmtid = db2_prepare($this->_connectionID,$sql);

				if ($stmtid == false) {

					$this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';

					return false;

				}

			}

			if (! db2_execute($stmtid,$inputarr)) {

				if ($this->_haserrorfunctions) {

					$this->_errorMsg = db2_errormsg();

					$this->_errorCode = db2_error();

				}

				return false;

			}

		} else if (is_array($sql)) {

			$stmtid = $sql[1];

			if (!db2_execute($stmtid)) {

				if ($this->_haserrorfunctions) {

					$this->_errorMsg = db2_errormsg();

					$this->_errorCode = db2_error();

				}

				return false;

			}

		} else

			$stmtid = db2_exec($this->_connectionID,$sql);

		$this->_lastAffectedRows = 0;

		if ($stmtid) {

			if (@db2_num_fields($stmtid) == 0) {

				$this->_lastAffectedRows = db2_num_rows($stmtid);

				$stmtid = true;

			} else {

				$this->_lastAffectedRows = 0;

			}

			if ($this->_haserrorfunctions) {

				$this->_errorMsg = '';

				$this->_errorCode = 0;

			} else

				$this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';

		} else {

			if ($this->_haserrorfunctions) {

				$this->_errorMsg = db2_stmt_errormsg();

				$this->_errorCode = db2_stmt_error();

			} else

				$this->_errorMsg = isset($php_errormsg) ? $php_errormsg : '';

		}

		return $stmtid;

	}

	/*

		Insert a null into the blob field of the table first.

		Then use UpdateBlob to store the blob.

		Usage:

		$conn->Execute('INSERT INTO blobtable (id, blobcol) VALUES (1, null)');

		$conn->UpdateBlob('blobtable','blobcol',$blob,'id=1');

	*/

	function UpdateBlob($table,$column,$val,$where,$blobtype='BLOB')

	{

		return $this->Execute("UPDATE $table SET $column=? WHERE $where",array($val)) != false;

	}

	// returns true or false

	function _close()

	{

		$ret = @db2_close($this->_connectionID);

		$this->_connectionID = false;

		return $ret;

	}

	function _affectedrows()

	{

		return $this->_lastAffectedRows;

	}

}

/*--------------------------------------------------------------------------------------

	 Class Name: Recordset

--------------------------------------------------------------------------------------*/

class ADORecordSet_db2 extends ADORecordSet {	

	var $bind = false;

	var $databaseType = "db2";		

	var $dataProvider = "db2";

	var $useFetchArray;

	function ADORecordSet_db2($id,$mode=false)

	{

		if ($mode === false) {  

			global $ADODB_FETCH_MODE;

			$mode = $ADODB_FETCH_MODE;

		}

		$this->fetchMode = $mode;

		$this->_queryID = $id;

	}

	// returns the field object

	function &FetchField($fieldOffset = -1) 

	{

		$off=$fieldOffset+1; // offsets begin at 1

		$o= new ADOFieldObject();

		$o->name = @db2_field_name($this->_queryID,$off);

		$o->type = @db2_field_type($this->_queryID,$off);

		$o->max_length = db2_field_width($this->_queryID,$off);

		if (ADODB_ASSOC_CASE == 0) $o->name = strtolower($o->name);

		else if (ADODB_ASSOC_CASE == 1) $o->name = strtoupper($o->name);

		return $o;

	}

	/* Use associative array to get fields array */

	function Fields($colname)

	{

		if ($this->fetchMode & ADODB_FETCH_ASSOC) return $this->fields[$colname];

		if (!$this->bind) {

			$this->bind = array();

			for ($i=0; $i < $this->_numOfFields; $i++) {

				$o = $this->FetchField($i);

				$this->bind[strtoupper($o->name)] = $i;

			}

		}

		 return $this->fields[$this->bind[strtoupper($colname)]];

	}

	function _initrs()

	{

	global $ADODB_COUNTRECS;

		$this->_numOfRows = ($ADODB_COUNTRECS) ? @db2_num_rows($this->_queryID) : -1;

		$this->_numOfFields = @db2_num_fields($this->_queryID);

		// some silly drivers such as db2 as/400 and intersystems cache return _numOfRows = 0

		if ($this->_numOfRows == 0) $this->_numOfRows = -1;

	}	

	function _seek($row)

	{

		return false;

	}

	// speed up SelectLimit() by switching to ADODB_FETCH_NUM as ADODB_FETCH_ASSOC is emulated

	function &GetArrayLimit($nrows,$offset=-1) 

	{

		if ($offset <= 0) {

			$rs =& $this->GetArray($nrows);

			return $rs;

		}

		$savem = $this->fetchMode;

		$this->fetchMode = ADODB_FETCH_NUM;

		$this->Move($offset);

		$this->fetchMode = $savem;

		if ($this->fetchMode & ADODB_FETCH_ASSOC) {

			$this->fields =& $this->GetRowAssoc(ADODB_ASSOC_CASE);

		}

		$results = array();

		$cnt = 0;

		while (!$this->EOF && $nrows != $cnt) {

			$results[$cnt++] = $this->fields;

			$this->MoveNext();

		}

		return $results;

	}

	function MoveNext() 

	{

		if ($this->_numOfRows != 0 && !$this->EOF) {		

			$this->_currentRow++;

			$this->fields = @db2_fetch_array($this->_queryID);

			if ($this->fields) {

				if ($this->fetchMode & ADODB_FETCH_ASSOC) {

					$this->fields =& $this->GetRowAssoc(ADODB_ASSOC_CASE);

				}

				return true;

			}

		}

		$this->fields = false;

		$this->EOF = true;

		return false;

	}	

	function _fetch()

	{

		$this->fields = db2_fetch_array($this->_queryID);

		if ($this->fields) {

			if ($this->fetchMode & ADODB_FETCH_ASSOC) {

				$this->fields =& $this->GetRowAssoc(ADODB_ASSOC_CASE);

			}

			return true;

		}

		$this->fields = false;

		return false;

	}

	function _close() 

	{

		return @db2_free_result($this->_queryID);		

	}

}

?>