<?php
/**
 * class.database_mssql.php
 * @package gulliver.system
 *
 * ProcessMaker Open Source Edition
 * Copyright (C) 2004 - 2011 Colosa Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * For more information, contact Colosa Inc, 2566 Le Jeune Rd.,
 * Coral Gables, FL, 33134, USA, or email info@colosa.com.
 *
 */

/**
 * @package gulliver.system
*/

G::LoadSystem('database_base');

class database extends database_base {

  public $iFetchType = MSSQL_ASSOC;

  public function __construct($sType = DB_ADAPTER, $sServer = DB_HOST, $sUser = DB_USER, $sPass = DB_PASS, $sDataBase = DB_NAME) {
    $this->sType           = $sType;
    $this->sServer         = $sServer;
    $this->sUser           = $sUser;
    $this->sPass           = $sPass;
    $this->sDataBase       = $sDataBase;
    $this->oConnection     = @mssql_connect($sServer, $sUser, $sPass) || null;
    $this->sQuoteCharacter = ' ';
    $this->nullString      = 'NULL';
    $this->sQuoteCharacterBegin = '[';
    $this->sQuoteCharacterEnd   = ']';
  }


  public function generateCreateTableSQL($sTable, $aColumns) {
    $sKeys = '';
    $sSQL = 'CREATE TABLE  ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter . '(';

    foreach ($aColumns as $sColumnName => $aParameters) {
      if ($sColumnName != 'INDEXES') {

        if ( $sColumnName != '' && isset($aParameters['Type']) && $aParameters['Type'] != '' ){
          $sSQL .= $this->sQuoteCharacter . $sColumnName . $this->sQuoteCharacter . ' ' . $aParameters['Type'];

          if ( isset($aParameters['Null']) && $aParameters['Null'] == 'YES') {
          $sSQL .= ' NULL';
        } else {
          $sSQL .= ' NOT NULL';
        }
        if ( isset($aParameters['Key']) && $aParameters['Key'] == 'PRI') {
          $sKeys .= $this->sQuoteCharacter . $sColumnName . $this->sQuoteCharacter . ',';
        }

        if ( isset($aParameters['Default']) && $aParameters['Default'] != '' ) {
          $sSQL .= " DEFAULT '" . $aParameters['Default'] . "'";
        }

        $sSQL .= ',';
        }
      }
    }
    $sSQL = substr($sSQL, 0, -1);
    if ($sKeys != '') {
      $sSQL .= ',PRIMARY KEY(' . substr($sKeys, 0, -1) . ')';
    }
    $sSQL .= ')' . $this->sEndLine;

    return $sSQL;
  }

  public function generateDropTableSQL($sTable) {
    return 'DROP TABLE ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter . $this->sEndLine;
  }

  public function generateDropColumnSQL($sTable, $sColumn) {
    // SQL Server first should remove the restriction before the Elimination of the field
    $oConstraint = $this->dropFieldConstraint($sTable, $sColumn);
    $sSQL = 'ALTER TABLE ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter .
            ' DROP COLUMN ' . $this->sQuoteCharacter . $sColumn . $this->sQuoteCharacter . $this->sEndLine;
    return $sSQL;
  }

  public function generateAddColumnSQL($sTable, $sColumn, $aParameters) {
    if ( isset($aParameters['Type']) && isset($aParameters['Null']) ) {
      $sDefault = "";
      $sType = $aParameters['Type'];
      $sDataType = $aParameters['Type'];
      if(! in_array($sDataType, array("TEXT", "DATE") )) {
        $sType = substr($sType, 0, strpos($sType,'('));
      }
      switch($sType) {
        case 'VARCHAR' :
        case 'TEXT'    : $sDefault  = " DEFAULT '' ";
                         break;
        case 'DATE'    : $sDataType = " CHAR(19) ";
                         $sDefault  = " DEFAULT '0000-00-00' "; // The date data type to use char (19)
                         break;
        case 'INT'     :
        case 'FLOAT'   : $sDataType = $sType;
                         $sDefault  = " DEFAULT 0 ";
                         break;
      }
      $sSQL = "ALTER TABLE " . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter .
              " ADD " . $this->sQuoteCharacter . $sColumn . $this->sQuoteCharacter .
              " " . $aParameters['Type'];
      if ($aParameters['Null'] == 'YES') {
        $sSQL .= " NULL";
      }
      else {
        $sSQL .= " NOT NULL " . $sDefault;

      }
    }
    /*if ($aParameters['Key'] == 'PRI') {
      $sKeys .= 'ALTER TABLE ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter .
                ' ADD PRIMARY KEY (' . $this->sQuoteCharacter . $sColumn . $this->sQuoteCharacter . ')' . $this->sEndLine;
    }*/
    if (isset($aParameters['AI'])) {
      if ($aParameters['AI'] == 1) {
        $sSQL .= ' AUTO_INCREMENT';
      }
      else {
        if ($aParameters['Default'] != '') {
          $sSQL .= " DEFAULT '" . $aParameters['Default'] . "'";
        }
      }
    }
    else {
      if (isset($aParameters['Default']) && $aParameters['Default'] != '') {
        $sSQL .= " DEFAULT '" . $aParameters['Default'] . "'";
      }
    }
    $sSQL .= $this->sEndLine;
    return $sSQL;
  }

  public function generateChangeColumnSQL($sTable, $sColumn, $aParameters, $sColumnNewName = '') {
    $sSQL = 'ALTER TABLE ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter .
            ' CHANGE COLUMN ' . $this->sQuoteCharacter . ($sColumnNewName != '' ? $sColumnNewName : $sColumn) . $this->sQuoteCharacter .
            ' ' . $this->sQuoteCharacter . $sColumn . $this->sQuoteCharacter;
    if (isset($aParameters['Type'])) {
      $sSQL .= ' ' . $aParameters['Type'];
    }
    if (isset($aParameters['Null'])) {
      if ($aParameters['Null'] == 'YES') {
        $sSQL .= ' NULL';
      }
      else {
        $sSQL .= ' NOT NULL';
      }
    }
    //if (isset($aParameters['AI'])) {
    //  if ($aParameters['AI'] == 1) {
    //    $sSQL .= ' AUTO_INCREMENT';
    //  }
    //  else {
    //    if (isset($aParameters['Default'])) {
    //      if ($aParameters['Default'] != '') {
    //        $sSQL .= " DEFAULT '" . $aParameters['Default'] . "'";
    //      }
    //    }
    //  }
    //}
    //else {
    if (isset($aParameters['Default'])) {
      if ( trim($aParameters['Default'] == '') && $aParameters['Type'] == 'datetime' ) {
        //do nothing
      }
      else
        $sSQL .= " DEFAULT '" . $aParameters['Default'] . "'";
      //}
    }
    if (!isset($aParameters['Default']) && isset($aParameters['Null']) && $aParameters['Null'] == 'YES') {
      $sSQL .= " DEFAULT NULL ";
    }
    //}
    $sSQL .= $this->sEndLine;
    return $sSQL;
  }

  public function generateGetPrimaryKeysSQL($sTable) {
    try {
      if ($sTable == '') {
        throw new Exception('The table name cannot be empty!');
      }
      return 'SHOW INDEX FROM  ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter . ' WHERE Seq_in_index = 1' . $this->sEndLine;
    }
    catch (Exception $oException) {
      throw $oException;
    }
  }

 /**
  * Get primary key
  * @parameter string $sTable
  * @return string $sPrimaryKey
  */
  public function getPrimaryKey($sTable)
  {
    try {
        $sSQL = " SELECT 	c.COLUMN_NAME " .
	              " FROM 	INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk , " .
		            "       INFORMATION_SCHEMA.KEY_COLUMN_USAGE c " .
	              " WHERE 	pk.TABLE_NAME = '" . trim($sTable) . "' " .
	              " AND	CONSTRAINT_TYPE = 'PRIMARY KEY' " .
	              " AND	c.TABLE_NAME = pk.TABLE_NAME " .
	              " AND	c.CONSTRAINT_NAME = pk.CONSTRAINT_NAME ";
        $oPrimaryKey = $this->executeQuery($sSQL);
        $aPrimaryKey = mssql_fetch_array($oPrimaryKey);
        mssql_free_result($oPrimaryKey);
        return $aPrimaryKey[0];
    } catch (Exception $oException) {
      throw $oException;
    }
  }

 /**
  * Get Field Constraint
  * @parameter string $sTable
  * @parameter string $sField
  * @return string $sFieldConstraint
  */
  public function getFieldConstraint($sTable, $sField)
  {
    try {
        $sSQL = " select a.name " .
                " from sysobjects a " .
                "   inner join syscolumns b on a.id = b.cdefault " .
                " where a.xtype = 'D' " .
                " and a.parent_obj = (select id from sysobjects where xtype = 'U' and name = '" . trim($sTable) . "') " .
                " and b.name = '" . trim($sField) . "' ";

        $oFieldConstraint = $this->executeQuery($sSQL);
        $aFieldConstraint = mssql_fetch_array($oFieldConstraint);
        mssql_free_result($oFieldConstraint);
        return $aFieldConstraint[0];
    } catch (Exception $oException) {
      throw $oException;
    }
  }


 /**
  * drop Field Constraint
  * @parameter string $sTable
  * @parameter string $sField
  * @return object $oFieldConstraint
  */
  public function dropFieldConstraint($sTable, $sField)
  {
    try {
        $sConstraint = $this->getFieldConstraint($sTable, $sField);
        $sSQL = "ALTER TABLE " . $sTable . " DROP CONSTRAINT " . $sConstraint . $this->sEndLine ;
        $oFieldConstraint = $this->executeQuery($sSQL);
        return $oFieldConstraint;
    } catch (Exception $oException) {
      throw $oException;
    }
  }


  public function generateDropPrimaryKeysSQL($sTable) {
    try {
      if ($sTable == '') {
        throw new Exception('The table name cannot be empty!');
      }
      $sPrimayKey = $this->getPrimaryKey($sTable);

      return ' ALTER TABLE ' . $sTable . ' DROP CONSTRAINT ' . $sPrimayKey . $this->sEndLine;
    }
    catch (Exception $oException) {
      throw $oException;
    }
  }

  public function generateAddPrimaryKeysSQL($sTable, $aPrimaryKeys) {
    try {
      if ($sTable == '') {
        throw new Exception('The table name cannot be empty!');
      }
      $sSQL = 'ALTER TABLE ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter .
              ' ADD PRIMARY KEY (';
      foreach ($aPrimaryKeys as $sKey) {
        $sSQL .= $this->sQuoteCharacter . $sKey . $this->sQuoteCharacter . ',';
      }
      $sSQL = substr($sSQL, 0, -1) . ')' . $this->sEndLine;
      return $sSQL;
    }
    catch (Exception $oException) {
      throw $oException;
    }
  }

  public function generateDropKeySQL($sTable, $sIndexName) {
    try {
      if ($sTable == '') {
        throw new Exception('The table name cannot be empty!');
      }
      if ($sIndexName == '') {
        throw new Exception('The column name cannot be empty!');
      }
      return 'ALTER TABLE ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter . ' DROP INDEX ' . $this->sQuoteCharacter . $sIndexName . $this->sQuoteCharacter . $this->sEndLine;
    }
    catch (Exception $oException) {
      throw $oException;
    }
  }

  public function generateAddKeysSQL($sTable, $indexName, $aKeys) {
    try {
      $indexType = 'INDEX';
      if ( $indexName == 'primaryKey' || $indexName == 'PRIMARY' ) {
        $indexType = 'PRIMARY';
        $indexName = 'KEY';
      }
      $sSQL = 'ALTER TABLE ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter . ' ADD ' . $indexType . ' ' . $indexName . ' (';
      foreach ($aKeys as $sKey) {
        $sSQL .= $this->sQuoteCharacter . $sKey . $this->sQuoteCharacter . ', ';
      }
      $sSQL  = substr($sSQL, 0, -2);
      $sSQL .= ')' . $this->sEndLine;
      return $sSQL;
    }
    catch (Exception $oException) {
      throw $oException;
    }
  }

  public function generateShowTablesSQL() {
    return 'SHOW TABLES' . $this->sEndLine;
  }

  public function generateShowTablesLikeSQL($sTable) {
    return "SHOW TABLES LIKE '" . $sTable . "'" . $this->sEndLine;
  }

  public function generateDescTableSQL($sTable) {
    try {
      if ($sTable == '') {
        throw new Exception('The table name cannot be empty!');
      }
      return 'DESC ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter . $this->sEndLine;
    }
    catch (Exception $oException) {
      throw $oException;
    }
  }

  public function generateTableIndexSQL($sTable) {
    return 'SHOW INDEX FROM ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter . " " . $this->sEndLine;
    //return 'SHOW INDEX FROM ' . $this->sQuoteCharacter . $sTable . $this->sQuoteCharacter . " WHERE Key_name <> 'PRIMARY'" . $this->sEndLine;
  }

  public function isConnected() {
    if ( !$this->oConnection )
      return false;
    return $this->executeQuery( 'USE ' . $this->sDataBase );
  }

  public function logQuery($sQuery ) {
    try {
      $found = false;
      if ( substr($sQuery,0, 6) == 'SELECT' ) $found = true;
      if ( substr($sQuery,0, 4) == 'SHOW'   ) $found = true;
      if ( substr($sQuery,0, 4) == 'DESC'   ) $found = true;
      if ( substr($sQuery,0, 4) == 'USE '   ) $found = true;
      if ( ! $found ) {
      $logFile = PATH_DATA . 'log' . PATH_SEP . 'query.log';
      $fp = fopen ( $logFile, 'a+' );
      fwrite ( $fp, date("Y-m-d H:i:s") . " " . $this->sDataBase . " " . $sQuery  . "\n" );
      fclose ( $fp );
      }
    }
    catch (Exception $oException) {
    }
  }

  public function executeQuery($sQuery) {
    $this->logQuery( $sQuery);

    try {
      if ($this->oConnection) {
        @mssql_select_db($this->sDataBase);

        return @mssql_query($sQuery);
      }
      else {
        throw new Exception('invalid connection to database ' . $this->sDataBase );
      }
    }
    catch (Exception $oException) {
      $this->logQuery( $oException->getMessage() );
      throw $oException;
    }
  }

  public function countResults($oDataset) {
    return @mssql_num_rows($oDataset);
  }

  public function getRegistry($oDataset) {
    return @mssql_fetch_array($oDataset, $this->iFetchType);
  }

  public function close() {
    @mssql_close($this->oConnection);
  }

  public function generateInsertSQL($table, $data) {
    $fields = array();
    $values = array();
    foreach ($data as $field) {
      $fields[] = $field['field'];
      if (!is_null($field['value'])) {
        switch ($field['type']) {
          case 'text':
          case 'date':
            $values[] = "'" . addslashes($field['value']) . "'";
          break;
          case 'int':
          default:
            $values[] = addslashes($field['value']);
          break;
        }
      }
      else {
        $values[] = $this->nullString;
      }
    }
    $fields = array_map(array($this, 'putQuotes'), $fields);
    $sql = sprintf("INSERT INTO %s (%s) VALUES (%s)", $this->putQuotes($table), implode(', ', $fields), implode(', ', $values));
    return $sql;
  }

  public function generateUpdateSQL($table, $keys, $data) {
    $fields = array();
    $where  = array();
    foreach ($data as $field) {
      if (!is_null($field['value'])) {
        switch ($field['type']) {
          case 'text':
          case 'date':
            $fields[] = $this->putQuotes($field['field']) . " = '" . addslashes($field['value']) . "'";
          break;
          case 'int':
          default:
            $fields[] = $this->putQuotes($field['field']) . " = " . addslashes($field['value']);
          break;
        }
      }
      else {
        $values[] = $this->nullString;
      }
      if (in_array($field['field'], $keys)) {
        $where[] = $fields[count($fields) - 1];
      }
    }
    $sql = sprintf("UPDATE %s SET %s WHERE %s", $this->putQuotes($table), implode(', ', $fields), implode(', ', $where));
    return $sql;
  }

  public function generateDeleteSQL($table, $keys, $data) {
    $fields = array();
    $where  = array();
    foreach ($data as $field) {
      if (in_array($field['field'], $keys)) {
        if (!is_null($field['value'])) {
          switch ($field['type']) {
            case 'text':
            case 'date':
              $where[] = $this->putQuotes($field['field']) . " = '" . addslashes($field['value']) . "'";
            break;
            case 'int':
            default:
              $where[] = $this->putQuotes($field['field']) . " = " . addslashes($field['value']);
            break;
          }
        }
        else {
          $values[] = $this->nullString;
        }
      }
    }
    $sql = sprintf("DELETE FROM %s WHERE %s", $this->putQuotes($table), implode(', ', $where));
    return $sql;
  }

  public function generateSelectSQL($table, $keys, $data) {
    $fields = array();
    $where  = array();
    foreach ($data as $field) {
      if (in_array($field['field'], $keys)) {
        if (!is_null($field['value'])) {
          switch ($field['type']) {
            case 'text':
            case 'date':
              $where[] = $this->putQuotes($field['field']) . " = '" . mysql_real_escape_string($field['value']) . "'";
            break;
            case 'int':
            default:
              $where[] = $this->putQuotes($field['field']) . " = " . mysql_real_escape_string($field['value']);
            break;
          }
        }
        else {
          $values[] = $this->nullString;
        }
      }
    }
    $sql = sprintf("SELECT * FROM %s WHERE %s", $this->putQuotes($table), implode(', ', $where));
    return $sql;
  }

  private function putQuotes($element) {
    return $this->sQuoteCharacterBegin . $element . $this->sQuoteCharacterEnd;
  }

 /*=================================================================================================*/
   /**
   * concatString
   * Generates a string equivalent to the chosen database.
   *
   * author Hector Cortez <hector@gmail.com>
   * date 2010-08-04
   *
   * @return string $sConcat
   */
  function concatString()
  {
    $nums    = func_num_args();
    $vars    = func_get_args();
    $sConcat = "";
    for($i = 0;$i < $nums; $i++) {
      if(isset($vars[$i])) {
        $sConcat .= $vars[$i];
        if(($i+1) < $nums)
          $sConcat .= " + ";
      }
    }
    return $sConcat;
  }

  /*
   * query functions for class class.case.php
   *
   */
  /**
   * concatString
   * Generates a string equivalent to the case when
   *
   * @author Hector Cortez <hector@gmail.com>
   * date 2010-08-04
   *
   * @return string $sCompare
   */
  function getCaseWhen($compareValue, $trueResult, $falseResult)
  {
    $sCompare = " CASE WHEN " . $compareValue . " THEN " . $trueResult . " ELSE " . $falseResult . " END ";
    return $sCompare;
  }

  /**
   * Generates a string equivalent to create table ObjectPermission
   *
   * class.case.php
   * function verifyTable()
   *
   * @return string $sql
   */
  function createTableObjectPermission()
  {
    $sql = "IF NOT EXISTS (SELECT * FROM sysobjects WHERE name='OBJECT_PERMISSION' AND xtype='U')
          CREATE TABLE OBJECT_PERMISSION (
          OP_UID varchar(32) NOT NULL,
          PRO_UID varchar(32) NOT NULL,
          TAS_UID varchar(32) NOT NULL,
          USR_UID varchar(32) NOT NULL,
          OP_USER_RELATION int NOT NULL default '1',
          OP_TASK_SOURCE varchar(32) NOT NULL,
          OP_PARTICIPATE int NOT NULL default '1',
          OP_OBJ_TYPE varchar(15) NOT NULL default 'ANY',
          OP_OBJ_UID varchar(32) NOT NULL,
          OP_ACTION varchar(10) NOT NULL default 'VIEW',
          CONSTRAINT PK_PRO_UID PRIMARY KEY CLUSTERED (PRO_UID, TAS_UID,USR_UID, OP_TASK_SOURCE, OP_OBJ_UID)  )";
    return $sql;
  }

  /*
   * query functions for class class.report.php
   *
   */
  /**
   * Generates a string query
   *
   * class.report.php
   * function generatedReport4()
   *
   * @return string $sql
   */
  function getSelectReport4()
  {

      $sqlConcat   = " U.USR_LASTNAME + ' ' + USR_FIRSTNAME AS [USER] ";
      $sqlGroupBy  = " U.USR_LASTNAME + ' ' + USR_FIRSTNAME ";

      $sql = "SELECT " . $sqlConcat .  ", " .
             "  COUNT(*) AS CANTCASES,
                MIN(AD.DEL_DURATION) AS MIN,
                MAX(AD.DEL_DURATION) AS MAX,
                SUM(AD.DEL_DURATION) AS TOTALDUR,
                AVG(AD.DEL_DURATION) AS PROMEDIO
                FROM APPLICATION AS A
                LEFT JOIN APP_DELEGATION AS AD ON(A.APP_UID = AD.APP_UID AND AD.DEL_INDEX=1)
                LEFT JOIN USERS AS U ON(U.USR_UID = A.APP_INIT_USER)
                WHERE A.APP_UID<>''
                GROUP BY " . $sqlGroupBy;

    return $sql;

  }

  /**
   * Generates a string query
   *
   * class.report.php
   * function generatedReport4_filter()
   *
   * @return string $sql
   */
  function getSelectReport4Filter($var)
  {
    $sqlConcat   = " U.USR_LASTNAME + ' ' + USR_FIRSTNAME AS [USER] ";
    $sqlGroupBy  = " U.USR_LASTNAME + ' ' + USR_FIRSTNAME ";

    $sql = " SELECT " . $sqlConcat .  ", " .
           " COUNT(*) AS CANTCASES,
             MIN(AD.DEL_DURATION) AS MIN,
             MAX(AD.DEL_DURATION) AS MAX,
             SUM(AD.DEL_DURATION) AS TOTALDUR,
             AVG(AD.DEL_DURATION) AS PROMEDIO
             FROM APPLICATION AS A
             LEFT JOIN APP_DELEGATION AS AD ON(A.APP_UID = AD.APP_UID AND AD.DEL_INDEX=1)
             LEFT JOIN USERS AS U ON(U.USR_UID = A.APP_INIT_USER)
             ".$var."
             GROUP BY " . $sqlGroupBy;

    return $sql;

  }

  /**
   * Generates a string query
   *
   * class.report.php
   * function generatedReport5()
   *
   * @return string $sql
   */
  function getSelectReport5()
  {

    $sqlConcat   = " U.USR_LASTNAME + ' ' + USR_FIRSTNAME AS [USER] ";
    $sqlGroupBy  = " U.USR_LASTNAME + ' ' + USR_FIRSTNAME ";

    $sql =  " SELECT " . $sqlConcat .  ", " .
            " COUNT(*) AS CANTCASES,
              MIN(AD.DEL_DURATION) AS MIN,
              MAX(AD.DEL_DURATION) AS MAX,
              SUM(AD.DEL_DURATION) AS TOTALDUR,
              AVG(AD.DEL_DURATION) AS PROMEDIO
              FROM APP_DELEGATION AS AD
              LEFT JOIN PROCESS AS P ON (P.PRO_UID = AD.PRO_UID)
              LEFT JOIN USERS AS U ON(U.USR_UID = AD.USR_UID)
              WHERE AD.APP_UID<>'' AND AD.DEL_FINISH_DATE IS NULL
              GROUP BY " . $sqlGroupBy;

    return $sql;

  }

  /**
   * Generates a string query
   *
   * class.report.php
   * function generatedReport5_filter()
   *
   * @return string $sql
   */
  function getSelectReport5Filter($var)
  {

    $sqlConcat   = " U.USR_LASTNAME + ' ' + USR_FIRSTNAME AS [USER] ";
    $sqlGroupBy  = " U.USR_LASTNAME + ' ' + USR_FIRSTNAME ";

    $sql = "SELECT " . $sqlConcat .  ", " .
           "  COUNT(*) AS CANTCASES,
              MIN(AD.DEL_DURATION) AS MIN,
              MAX(AD.DEL_DURATION) AS MAX,
              SUM(AD.DEL_DURATION) AS TOTALDUR,
              AVG(AD.DEL_DURATION) AS PROMEDIO
              FROM APP_DELEGATION AS AD
              LEFT JOIN PROCESS AS P ON (P.PRO_UID = AD.PRO_UID)
              LEFT JOIN USERS AS U ON(U.USR_UID = AD.USR_UID)
              ".$var."
              GROUP BY " . $sqlGroupBy;

    return $sql;
  }

  /*
   * query functions for class class.net.php
   *
   */
  function getServerVersion($driver, $dbIP, $dbPort, $dbUser, $dbPasswd, $dbSourcename)
  {

    if(strlen(trim($dbIP))<=0)
      $dbIP = DB_HOST;
    if($link = @mssql_connect($dbIP, $dbUser, $dbPasswd)){
      @mssql_select_db( DB_NAME, $link );
      $oResult = @mssql_query("select substring(@@version, 21, 6) + ' (' + CAST(SERVERPROPERTY ('productlevel') as varchar(10)) + ') ' + CAST(SERVERPROPERTY('productversion') AS VARCHAR(15)) + ' ' + CAST(SERVERPROPERTY ('edition') AS VARCHAR(25)) as version; ", $link);
      $aResult = @mssql_fetch_array($oResult);
      @mssql_free_result($oResult);
      $v = $aResult[0];
    } else {
      throw new Exception(@mssql_error($link));
    }
    return (isset($v))?$v:'none';

  }


    /*
   * query functions for class class.net.php
   *
   */
  function getDropTable($sTableName)
  {
    $sql =  "IF NOT EXISTS (SELECT * FROM sysobjects WHERE name='" . $sTableName . "' AND xtype='U') " .
            "DROP TABLE ['" . $sTableName . "']";
    return $sql;
  }


  function getTableDescription($sTableName)
  {
    $sql = " select column_name as Field,
              data_type + ' ' +
              (case data_type
              when 'char'
                then '(' + convert (varchar(6),character_maximum_length) + ')'
              when 'varchar'
                then '(' + convert (varchar(6),character_maximum_length) + ')'
              when 'nchar'
                then '(' + convert (varchar(6),character_maximum_length) + ')'
              when 'nvarchar'
                then '(' + convert (varchar(6),character_maximum_length) + ')'
              else ' ' end) as Type,
              (case is_nullable
              when 'No' then 'NO' else 'YES' END) AS AsNull,
              COLUMN_DEFAULT as [Default]
            FROM information_schema.columns
            WHERE table_name = '" . trim($sTableName) . "'" .
          " Order by Ordinal_Position asc ";
    return $sql;
  }

  function getFieldNull()
  {
    $fieldName = "AsNull";
    return $fieldName;
  }

  function getValidate($validate)
  {
    $oValidate = true;
    return $oValidate;
  }

  /**
   * Determines whether a table exists
   * It is part of class.reportTables.php
   */
  function reportTableExist()
  {
    $bExists  = true;
    $oConnection = mssql_connect(DB_HOST, DB_USER, DB_PASS);
    mssql_select_db(DB_NAME);
    $oDataset = mssql_query('SELECT COUNT(*) FROM REPORT_TABLE') || ($bExists = false);

    return $bExists;
  }

  /**
   * It is part of class.pagedTable.php
   */
  function getLimitRenderTable($nCurrentPage, $nRowsPerPage)
  {
    $sql = "";
    return $sql;
  }

  /**
   * Determining the existence of a table
   */
  function tableExists ($table, $db) {
    $sql = "SELECT * FROM sysobjects WHERE name='" . $table . "' AND type='u'";
    $bExists  = true;
    $oConnection = mssql_connect(DB_HOST, DB_USER, DB_PASS);
    mssql_select_db(DB_NAME);
    $oDataset = mssql_query($sql) || ($bExists = false);
    return $bExists;
  }

}