<?php
/**
 * ADOdb driver for ADS.
 *
 * NOTE: This driver requires the Advantage PHP client libraries, which
 * can be downloaded for free via:
 * @link http://devzone.advantagedatabase.com/dz/content.aspx?key=20
 *
 * 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
 */

/*
DELPHI FOR PHP USERS:
      The following steps can be taken to utilize this driver from the
      CodeGear Delphi for PHP product:
        1 - See note above, download and install the Advantage PHP client.
        2 - Copy the following files to the Delphi for PHP\X.X\php\ext directory:
              ace32.dll
              axcws32.dll
              adsloc32.dll
              php_advantage.dll (rename the existing php_advantage.dll.5.x.x file)
        3 - Add the following line to the Delphi for PHP\X.X\php\php.ini.template file:
              extension=php_advantage.dll
        4 - To use: enter "ads" as the DriverName on a connection component, and set
            a Host property similar to "DataDirectory=c:\". See the Advantage PHP
            help file topic for ads_connect for details on connection path options
            and formatting.
        5 - (optional) - Modify the Delphi for PHP\X.X\vcl\packages\database.packages.php
            file and add ads to the list of strings returned when registering the
            Database object's DriverName property.

*/

// security - hide paths
if (!defined('ADODB_DIR')) {
	die();
}

define("_ADODB_ADS_LAYER", 2);

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


class ADODB_ads extends ADOConnection
{
	var $databaseType = "ads";
	var $fmt = "'m-d-Y'";
	var $fmtTimeStamp = "'Y-m-d H:i:s'";
	var $concat_operator = '';
	var $replaceQuote = "''"; // string to use to replace quotes
	var $dataProvider = "ads";
	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

	function __construct()
	{
	}

	// returns true or false
	function _connect($argDSN, $argUsername, $argPassword, $argDatabasename)
	{
		if (!function_exists('ads_connect')) {
			return null;
		}

		if ($this->debug && $argDatabasename && $this->databaseType != 'vfp') {
			ADOConnection::outp("For Advantage Connect(), $argDatabasename is not used. Place dsn in 1st parameter.");
		}
		$last_php_error = $this->resetLastError();
		if ($this->curmode === false) {
			$this->_connectionID = ads_connect($argDSN, $argUsername, $argPassword);
		} else {
			$this->_connectionID = ads_connect($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('ads_connect')) {
			return null;
		}

		$last_php_error = $this->resetLastError();
		$this->_errorMsg = '';
		if ($this->debug && $argDatabasename) {
			ADOConnection::outp("For PConnect(), $argDatabasename is not used. Place dsn in 1st parameter.");
		}
		//  print "dsn=$argDSN u=$argUsername p=$argPassword<br>"; flush();
		if ($this->curmode === false) {
			$this->_connectionID = ads_connect($argDSN, $argUsername, $argPassword);
		} else {
			$this->_connectionID = ads_pconnect($argDSN, $argUsername, $argPassword, $this->curmode);
		}

		$this->_errorMsg = $this->getChangedErrorMsg($last_php_error);
		if ($this->_connectionID && $this->autoRollback) {
			@ads_rollback($this->_connectionID);
		}
		if ($this->connectStmt) {
			$this->Execute($this->connectStmt);
		}

		return $this->_connectionID != false;
	}

	// returns the Server version and Description
	function ServerInfo()
	{

		if (!empty($this->host)) {
			$stmt = $this->Prepare('EXECUTE PROCEDURE sp_mgGetInstallInfo()');
			$res = $this->Execute($stmt);
			if (!$res) {
				print $this->ErrorMsg();
			} else {
				$ret["version"] = $res->fields[3];
				$ret["description"] = "Advantage Database Server";
				return $ret;
			}
		} else {
			return ADOConnection::ServerInfo();
		}
	}


	// returns true or false
	function CreateSequence($seqname = 'adodbseq', $start = 1)
	{
		$res = $this->Execute("CREATE TABLE $seqname ( ID autoinc( 1 ) ) IN DATABASE");
		if (!$res) {
			print $this->ErrorMsg();
			return false;
		} else {
			return true;
		}

	}

	// returns true or false
	function DropSequence($seqname = 'adodbseq')
	{
		$res = $this->Execute("DROP TABLE $seqname");
		if (!$res) {
			print $this->ErrorMsg();
			return false;
		} else {
			return true;
		}
	}


	// returns the generated ID or false
	// checks if the table already exists, else creates the table and inserts a record into the table
	// and gets the ID number of the last inserted record.
	function GenID($seqname = 'adodbseq', $start = 1)
	{
		$go = $this->Execute("select * from $seqname");
		if (!$go) {
			$res = $this->Execute("CREATE TABLE $seqname ( ID autoinc( 1 ) ) IN DATABASE");
			if (!$res) {
				print $this->ErrorMsg();
				return false;
			}
		}
		$res = $this->Execute("INSERT INTO $seqname VALUES( DEFAULT )");
		if (!$res) {
			print $this->ErrorMsg();
			return false;
		} else {
			$gen = $this->Execute("SELECT LastAutoInc( STATEMENT ) FROM system.iota");
			$ret = $gen->fields[0];
			return $ret;
		}

	}


	function ErrorMsg()
	{
		if ($this->_errorMsg !== false) {
			return $this->_errorMsg;
		}
		if (empty($this->_connectionID)) {
			return @ads_errormsg();
		}
		return @ads_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 = @ads_error();
		} else {
			$e = @ads_error($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;
		$this->_autocommit = false;
		return ads_autocommit($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;
		$ret = ads_commit($this->_connectionID);
		ads_autocommit($this->_connectionID, true);
		return $ret;
	}

	function RollbackTrans()
	{
		if ($this->transOff) {
			return true;
		}
		if ($this->transCnt) {
			$this->transCnt -= 1;
		}
		$this->_autocommit = true;
		$ret = ads_rollback($this->_connectionID);
		ads_autocommit($this->_connectionID, true);
		return $ret;
	}


	// Returns tables,Views or both on successful execution. Returns
	// tables by default on successful execution.
	function MetaTables($ttype = false, $showSchema = false, $mask = false)
	{
		$recordSet1 = $this->Execute("select * from system.tables");
		if (!$recordSet1) {
			print $this->ErrorMsg();
			return false;
		}
		$recordSet2 = $this->Execute("select * from system.views");
		if (!$recordSet2) {
			print $this->ErrorMsg();
			return false;
		}
		$i = 0;
		while (!$recordSet1->EOF) {
			$arr["$i"] = $recordSet1->fields[0];
			$recordSet1->MoveNext();
			$i = $i + 1;
		}
		if ($ttype == 'FALSE') {
			while (!$recordSet2->EOF) {
				$arr["$i"] = $recordSet2->fields[0];
				$recordSet2->MoveNext();
				$i = $i + 1;
			}
			return $arr;
		} elseif ($ttype == 'VIEWS') {
			while (!$recordSet2->EOF) {
				$arrV["$i"] = $recordSet2->fields[0];
				$recordSet2->MoveNext();
				$i = $i + 1;
			}
			return $arrV;
		} else {
			return $arr;
		}

	}

	function MetaPrimaryKeys($table, $owner = false)
	{
		$recordSet = $this->Execute("select table_primary_key from system.tables where name='$table'");
		if (!$recordSet) {
			print $this->ErrorMsg();
			return false;
		}
		$i = 0;
		while (!$recordSet->EOF) {
			$arr["$i"] = $recordSet->fields[0];
			$recordSet->MoveNext();
			$i = $i + 1;
		}
		return $arr;
	}

	/*
	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
		  $qid2 = ads_tables($this->_connectionID);
		  $rs = new ADORecordSet_ads($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();

		  $qid = ads_columns($this->_connectionID,$q,$o,strtoupper($table),'%');
		} */

		switch ($this->databaseType) {
			case 'access':
			case 'vfp':
				$qid = ads_columns($this->_connectionID);#,'%','',strtoupper($table),'%');
				break;


			case 'db2':
				$colname = "%";
				$qid = ads_columns($this->_connectionID, "", $schema, $table, $colname);
				break;

			default:
				$qid = @ads_columns($this->_connectionID, '%', '%', strtoupper($table), '%');
				if (empty($qid)) {
					$qid = ads_columns($this->_connectionID);
				}
				break;
		}
		if (empty($qid)) {
			return $false;
		}

		$rs = new ADORecordSet_ads($qid);
		$ADODB_FETCH_MODE = $savem;

		if (!$rs) {
			return $false;
		}
		$rs->_fetch();

		$retarr = array();

		/*
		$rs->fields indices
		0 TABLE_QUALIFIER
		1 TABLE_SCHEM
		2 TABLE_NAME
		3 COLUMN_NAME
		4 DATA_TYPE
		5 TYPE_NAME
		6 PRECISION
		7 LENGTH
		8 SCALE
		9 RADIX
		10 NULLABLE
		11 REMARKS
		*/
		while (!$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];
				$fld->type = $this->ODBCTypes($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;
	}

	// Returns an array of columns names for a given table
	function MetaColumnNames($table, $numIndexes = false, $useattnum = false)
	{
		$recordSet = $this->Execute("select name from system.columns where parent='$table'");
		if (!$recordSet) {
			print $this->ErrorMsg();
			return false;
		} else {
			$i = 0;
			while (!$recordSet->EOF) {
				$arr["FIELD$i"] = $recordSet->fields[0];
				$recordSet->MoveNext();
				$i = $i + 1;
			}
			return $arr;
		}
	}


	function Prepare($sql)
	{
		if (!$this->_bindInputArray) {
			return $sql;
		} // no binding
		$stmt = ads_prepare($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 {
				$stmtid = ads_prepare($this->_connectionID, $sql);

				if ($stmtid == false) {
					$this->_errorMsg = $this->getChangedErrorMsg($last_php_error);
					return false;
				}
			}

			if (!ads_execute($stmtid, $inputarr)) {
				//@ads_free_result($stmtid);
				$this->_errorMsg = ads_errormsg();
				$this->_errorCode = ads_error();
				return false;
			}

		} else {
			if (is_array($sql)) {
				$stmtid = $sql[1];
				if (!ads_execute($stmtid)) {
					//@ads_free_result($stmtid);
					$this->_errorMsg = ads_errormsg();
					$this->_errorCode = ads_error();
					return false;
				}
			} else {

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

			}
		}

		$this->_lastAffectedRows = 0;

		if ($stmtid) {

			if (@ads_num_fields($stmtid) == 0) {
				$this->_lastAffectedRows = ads_num_rows($stmtid);
				$stmtid = true;

			} else {

				$this->_lastAffectedRows = 0;
				ads_binmode($stmtid, $this->binmode);
				ads_longreadlen($stmtid, $this->maxblobsize);

			}

			$this->_errorMsg = '';
			$this->_errorCode = 0;
		} else {
			$this->_errorMsg = ads_errormsg();
			$this->_errorCode = ads_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')
	{
		$last_php_error = $this->resetLastError();
		$sql = "UPDATE $table SET $column=? WHERE $where";
		$stmtid = ads_prepare($this->_connectionID, $sql);
		if ($stmtid == false) {
			$this->_errorMsg = $this->getChangedErrorMsg($last_php_error);
			return false;
		}
		if (!ads_execute($stmtid, array($val), array(SQL_BINARY))) {
			$this->_errorMsg = ads_errormsg();
			$this->_errorCode = ads_error();
			return false;
		}
		return true;
	}

	// returns true or false
	function _close()
	{
		$ret = @ads_close($this->_connectionID);
		$this->_connectionID = false;
		return $ret;
	}

	function _affectedrows()
	{
		return $this->_lastAffectedRows;
	}

}

/*--------------------------------------------------------------------------------------
   Class Name: Recordset
--------------------------------------------------------------------------------------*/

class ADORecordSet_ads extends ADORecordSet
{

	var $bind = false;
	var $databaseType = "ads";
	var $dataProvider = "ads";
	var $useFetchArray;

	function __construct($queryID, $mode = false)
	{
		parent::__construct($queryID, $mode);

		// the following is required for mysql odbc driver in 4.3.1 -- why?
		$this->EOF = false;
		$this->_currentRow = -1;
	}


	// returns the field object
	function &FetchField($fieldOffset = -1)
	{

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

		$o = new ADOFieldObject();
		$o->name = @ads_field_name($this->_queryID, $off);
		$o->type = @ads_field_type($this->_queryID, $off);
		$o->max_length = @ads_field_len($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) ? @ads_num_rows($this->_queryID) : -1;
		$this->_numOfFields = @ads_num_fields($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;
		$rez = @ads_fetch_into($this->_queryID, $this->fields);
		if ($rez) {
			if ($this->fetchMode & ADODB_FETCH_ASSOC) {
				$this->fields = $this->GetRowAssoc();
			}
			return true;
		}
		return false;
	}

	function _close()
	{
		return @ads_free_result($this->_queryID);
	}

}
