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<?php

/**

 * Base ODBC driver

 *

 * This file is part of ADOdb, a Database Abstraction Layer library for PHP.

 *

 * @package ADOdb

 * @link https://adodb.org Project's web site and documentation

 * @link https://github.com/ADOdb/ADOdb Source code and issue tracker

 *

 * The ADOdb Library is dual-licensed, released under both the BSD 3-Clause

 * and the GNU Lesser General Public Licence (LGPL) v2.1 or, at your option,

 * any later version. This means you can use it in proprietary products.

 * See the LICENSE.md file distributed with this source code for details.

 * @license BSD-3-Clause

 * @license LGPL-2.1-or-later

 *

 * @copyright 2000-2013 John Lim

 * @copyright 2014 Damien Regad, Mark Newnham and the ADOdb community

 */

// security - hide paths

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

  define("_ADODB_ODBC_LAYER", 2 );

/*

 * These constants are used to set define MetaColumns() method's behavior.

 * - METACOLUMNS_RETURNS_ACTUAL makes the driver return the actual type,

 *   like all other drivers do (default)

 * - METACOLUMNS_RETURNS_META is provided for legacy compatibility (makes

 *   driver behave as it did prior to v5.21)

 *

 * @see $metaColumnsReturnType

 */

DEFINE('METACOLUMNS_RETURNS_ACTUAL', 0);

DEFINE('METACOLUMNS_RETURNS_META', 1);

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

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

class ADODB_odbc extends ADOConnection {

	var $databaseType = "odbc";

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

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

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

	var $dataProvider = "odbc";

	var $hasAffectedRows = true;

	var $binmode = ODBC_BINMODE_RETURN;

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

								// breaking backward-compat

	//var $longreadlen = 8000; // default number of chars to return for a Blob/Long field

	var $_bindInputArray = false;

	var $curmode = SQL_CUR_USE_DRIVER; // See sqlext.h, SQL_CUR_DEFAULT == SQL_CUR_USE_DRIVER == 2L

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

	var $_autocommit = true;

	var $_lastAffectedRows = 0;

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

	/*

	 * Tells the metaColumns feature whether to return actual or meta type

	 */

	public $metaColumnsReturnType = METACOLUMNS_RETURNS_ACTUAL;

	function __construct() {}

		// returns true or false

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

	{

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

		if (!empty($argDatabasename) && stristr($argDSN, 'Database=') === false) {

			$argDSN = trim($argDSN);

			$endDSN = substr($argDSN, strlen($argDSN) - 1);

			if ($endDSN != ';') $argDSN .= ';';

			$argDSN .= 'Database='.$argDatabasename;

		}

		$last_php_error = $this->resetLastError();

		if ($this->curmode === false) $this->_connectionID = odbc_connect($argDSN,$argUsername,$argPassword);

		else $this->_connectionID = odbc_connect($argDSN,$argUsername,$argPassword,$this->curmode);

		$this->_errorMsg = $this->getChangedErrorMsg($last_php_error);

		if ($this->connectStmt) {

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

		}

		return $this->_connectionID != false;

	}

	// returns true or false

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

	{

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

		$last_php_error = $this->resetLastError();

		$this->_errorMsg = '';

		if ($this->debug && $argDatabasename) {

			ADOConnection::outp("For odbc PConnect(), $argDatabasename is not used. Place dsn in 1st parameter.");

		}

	//	print "dsn=$argDSN u=$argUsername p=$argPassword<br>"; flush();

		if ($this->curmode === false) $this->_connectionID = odbc_connect($argDSN,$argUsername,$argPassword);

		else $this->_connectionID = odbc_pconnect($argDSN,$argUsername,$argPassword,$this->curmode);

		$this->_errorMsg = $this->getChangedErrorMsg($last_php_error);

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

		if ($this->connectStmt) {

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

		}

		return $this->_connectionID != false;

	}

	function ServerInfo()

	{

		if (!empty($this->host)) {

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

			$first = true;

			$found = false;

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

			while(true) {

				$rez = @odbc_data_source($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 = 'adodbseq')

	{

		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;

		//$this->debug=1;

		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;

			} elseif ($this->affected_rows() == 0) {

				// some drivers do not return a valid value => try with another method

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

				if ($value == $num + 1) {

					return $value;

				}

			}

		}

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

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

		return @odbc_errormsg($this->_connectionID);

	}

	function ErrorNo()

	{

		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 = @odbc_error();

		else $e = @odbc_error($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;

	}

	function BeginTrans()

	{

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

		if ($this->transOff) return true;

		$this->transCnt += 1;

		$this->_autocommit = false;

		return odbc_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;

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

		odbc_autocommit($this->_connectionID,true);

		return $ret;

	}

	function RollbackTrans()

	{

		if ($this->transOff) return true;

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

		$this->_autocommit = true;

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

		odbc_autocommit($this->_connectionID,true);

		return $ret;

	}

	function MetaPrimaryKeys($table,$owner=false)

	{

	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;

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

		if (!$qid) {

			$ADODB_FETCH_MODE = $savem;

			return false;

		}

		$rs = new ADORecordSet_odbc($qid);

		$ADODB_FETCH_MODE = $savem;

		if (!$rs) return false;

		$arr = $rs->GetArray();

		$rs->Close();

		//print_r($arr);

		$arr2 = array();

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

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

		}

		return $arr2;

	}

	function MetaTables($ttype=false,$showSchema=false,$mask=false)

	{

	global $ADODB_FETCH_MODE;

		$savem = $ADODB_FETCH_MODE;

		$ADODB_FETCH_MODE = ADODB_FETCH_NUM;

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

		$rs = new ADORecordSet_odbc($qid);

		$ADODB_FETCH_MODE = $savem;

		if (!$rs) {

			$false = false;

			return $false;

		}

		$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;

			$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/odbc/htm/odbcdatetime_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 (ODBCVER >= 0x0300)

#define SQL_DATETIME		9

#endif

#define SQL_VARCHAR		12

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

#if (ODBCVER >= 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 ODBCTypes($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, $normalize=true)

	{

	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;

		/*if (false) { // after testing, confirmed that the following does not work because of a bug

			$qid2 = odbc_tables($this->_connectionID);

			$rs = new ADORecordSet_odbc($qid2);

			$ADODB_FETCH_MODE = $savem;

			if (!$rs) return false;

			$rs->_fetch();

			while (!$rs->EOF) {

				if ($table == strtoupper($rs->fields[2])) {

					$q = $rs->fields[0];

					$o = $rs->fields[1];

					break;

				}

				$rs->MoveNext();

			}

			$rs->Close();

			$qid = odbc_columns($this->_connectionID,$q,$o,strtoupper($table),'%');

		} */

		switch ($this->databaseType) {

		case 'access':

		case 'vfp':

			$qid = odbc_columns($this->_connectionID);#,'%','',strtoupper($table),'%');

			break;

		case 'db2':

            $colname = "%";

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

            break;

		default:

			$qid = @odbc_columns($this->_connectionID,'%','%',strtoupper($table),'%');

			if (empty($qid)) $qid = odbc_columns($this->_connectionID);

			break;

		}

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

		$rs = new ADORecordSet_odbc($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) {

		//	adodb_pr($rs->fields);

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

				$fld = new ADOFieldObject();

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

				if ($this->metaColumnsReturnType == METACOLUMNS_RETURNS_META)

					/*

				    * This is the broken, original value

					*/

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

				else

					/*

				    * This is the correct new value

					*/

				    $fld->type = $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 ($this->databaseType == 'access')

						$fld->max_length = $rs->fields[6];

					else 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

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

		if (!$stmt) {

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

			return $sql;

		}

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

	}

	function _query($sql,$inputarr=false)

	{

		$last_php_error = $this->resetLastError();

		$this->_errorMsg = '';

		if ($inputarr) {

			if (is_array($sql)) {

				$stmtid = $sql[1];

			} else {

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

				if ($stmtid == false) {

					$this->_errorMsg = $this->getChangedErrorMsg($last_php_error);

					return false;

				}

			}

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

				//@odbc_free_result($stmtid);

				$this->_errorMsg = odbc_errormsg();

				$this->_errorCode = odbc_error();

				return false;

			}

		} else if (is_array($sql)) {

			$stmtid = $sql[1];

			if (!odbc_execute($stmtid)) {

				//@odbc_free_result($stmtid);

				$this->_errorMsg = odbc_errormsg();

				$this->_errorCode = odbc_error();

				return false;

			}

		} else

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

		$this->_lastAffectedRows = 0;

		if ($stmtid) {

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

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

				$stmtid = true;

			} else {

				$this->_lastAffectedRows = 0;

				odbc_binmode($stmtid,$this->binmode);

				odbc_longreadlen($stmtid,$this->maxblobsize);

			}

			$this->_errorMsg = '';

			$this->_errorCode = 0;

		} else {

			$this->_errorMsg = odbc_errormsg();

			$this->_errorCode = odbc_error();

		}

		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()

	{

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

		$this->_connectionID = false;

		return $ret;

	}

	function _affectedrows()

	{

		return $this->_lastAffectedRows;

	}

}

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

	 Class Name: Recordset

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

class ADORecordSet_odbc extends ADORecordSet {

	var $bind = false;

	var $databaseType = "odbc";

	var $dataProvider = "odbc";

	var $useFetchArray;

	function __construct($id,$mode=false)

	{

		if ($mode === false) {

			global $ADODB_FETCH_MODE;

			$mode = $ADODB_FETCH_MODE;

		}

		$this->fetchMode = $mode;

		$this->_queryID = $id;

		// the following is required for mysql odbc driver in 4.3.1 -- why?

		$this->EOF = false;

		$this->_currentRow = -1;

		//parent::__construct($id);

	}

	// returns the field object

	function FetchField($fieldOffset = -1)

	{

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

		$o= new ADOFieldObject();

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

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

		$o->max_length = @odbc_field_len($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) ? @odbc_num_rows($this->_queryID) : -1;

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

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

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

		//$this->useFetchArray = $this->connection->useFetchArray;

	}

	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();

		}

		$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++;

			if( $this->_fetch() ) {

				return true;

			}

		}

		$this->fields = false;

		$this->EOF = true;

		return false;

	}

	function _fetch()

	{

		$this->fields = false;

		$rez = @odbc_fetch_into($this->_queryID,$this->fields);

		if ($rez) {

			if ($this->fetchMode & ADODB_FETCH_ASSOC) {

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

			}

			return true;

		}

		return false;

	}

	function _close()

	{

		return @odbc_free_result($this->_queryID);

	}

}