title: DataTables using PHP with MySQL: How to modify the mysql query?
body: <p>So I'm trying to populate a html table using a table in my database. Lets call it 'business' and one of the columns is called 'id'.
  I am trying to use WHERE. I
  For example something like.. </p>
  
  <pre><code>SELECT * all FROM business WHERE id=4. 
  </code></pre>
  
  <p>Do I need to modify $sWhere?</p>
  
  <p>Here is the code that I am using for server side processing. </p>
  
  <pre><code>/*
   * Script:    DataTables server-side script for PHP and MySQL
   * Copyright: 2010 - Allan Jardine, 2012 - Chris Wright
   * License:   GPL v2 or BSD (3-point)
   */
  /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
   * Easy set variables
   */
  
  /* Array of database columns which should be read and sent back to DataTables. Use a space where
   * you want to insert a non-database field (for example a counter or static image)
   */
  $aColumns = array('bus_num', 'bus_phone', 'category_name', 'bus_status');
  
  /* Indexed column (used for fast and accurate table cardinality) */
  $sIndexColumn = "id";
  
  /* DB table to use */
  $sTable = "business";
  
  /* Database connection information */
  $gaSql['user']       = "dev";
  $gaSql['password']   = "dev";
  $gaSql['db']         = "dev";
  $gaSql['server']     = "localhost";
  
  /* REMOVE THIS LINE (it just includes my SQL connection user/pass) */
  $db = mysql_connect('localhost', 'dev', 'dev');
  
  if (!$db){
      die ("Could not connect to database" . mysql_error());
      exit();
  }
  
  $db_selected = mysql_select_db('dev', $db);
  
  if(!$db_selected) {
      die ('Can\'t use:' . mysql_error());
  }
  
  
  /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
   * If you just want to use the basic configuration for DataTables with PHP server-side, there is
   * no need to edit below this line
   */
  
  /*
   * Local functions
   */
  function fatal_error ( $sErrorMessage = '' )
  {
      header( $_SERVER['SERVER_PROTOCOL'] .' 500 Internal Server Error' );
      die( $sErrorMessage );
  }
  
  
  /*
   * MySQL connection
   */
  if ( ! $gaSql['link'] = mysql_pconnect( $gaSql['server'], $gaSql['user'], $gaSql['password']  ) )
  {
      fatal_error( 'Could not open connection to server' );
  }
  
  if ( ! mysql_select_db( $gaSql['db'], $gaSql['link'] ) )
  {
      fatal_error( 'Could not select database ' );
  }
  
  
  /*
   * Paging
   */
  $sLimit = "";
  if ( isset( $_GET['iDisplayStart'] ) &amp;&amp; $_GET['iDisplayLength'] != '-1' )
  {
      $sLimit = "LIMIT ".intval( $_GET['iDisplayStart'] ).", ".
          intval( $_GET['iDisplayLength'] );
  }
  
  
  /*
   * Ordering
   */
  $sOrder = "";
  if ( isset( $_GET['iSortCol_0'] ) )
  {
      $sOrder = "ORDER BY  ";
      for ( $i=0 ; $i&lt;intval( $_GET['iSortingCols'] ) ; $i++ )
      {
          if ( $_GET[ 'bSortable_'.intval($_GET['iSortCol_'.$i]) ] == "true" )
          {
              $sOrder .= $aColumns[ intval( $_GET['iSortCol_'.$i] ) ]."
                  ".($_GET['sSortDir_'.$i]==='asc' ? 'asc' : 'desc') .", ";
          }
      }
  
      $sOrder = substr_replace( $sOrder, "", -2 );
      if ( $sOrder == "ORDER BY" )
      {
          $sOrder = "";
      }
  }
  
  
  /*
   * Filtering
   * NOTE this does not match the built-in DataTables filtering which does it
   * word by word on any field. It's possible to do here, but concerned about efficiency
   * on very large tables, and MySQL's regex functionality is very limited
   */
  $sWhere = "";
  if ( isset($_GET['sSearch']) &amp;&amp; $_GET['sSearch'] != "" )
  {
      $sWhere = "WHERE (";
      for ( $i=0 ; $i&lt;count($aColumns) ; $i++ )
      {
          if ( isset($_GET['bSearchable_'.$i]) &amp;&amp; $_GET['bSearchable_'.$i] == "true" )
          {
              $sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string( $_GET['sSearch'] )."%' OR ";
          }
      }
      $sWhere = substr_replace( $sWhere, "", -3 );
      $sWhere .= ')';
  }
  
  /* Individual column filtering */
  for ( $i=0 ; $i&lt;count($aColumns) ; $i++ )
  {
      if ( isset($_GET['bSearchable_'.$i]) &amp;&amp; $_GET['bSearchable_'.$i] == "true" &amp;&amp; $_GET['sSearch_'.$i] != '' )
      {
          if ( $sWhere == "" )
          {
              $sWhere = "WHERE ";
          }
          else
          {
              $sWhere .= " AND ";
          }
          $sWhere .= $aColumns[$i]." LIKE '%".mysql_real_escape_string($_GET['sSearch_'.$i])."%' ";
      }
  }
  
  
  /*
   * SQL queries
   * Get data to display
   */
  $sQuery = "
      SELECT SQL_CALC_FOUND_ROWS ".str_replace(" , ", " ", implode(", ", $aColumns))."
      FROM   $sTable
      $sWhere
      $sOrder
      $sLimit 
  ";
  $rResult = mysql_query( $sQuery, $gaSql['link'] ) or fatal_error( 'MySQL Error: ' . mysql_errno() );
  
  /* Data set length after filtering */
  $sQuery = "
      SELECT FOUND_ROWS()
  ";
  $rResultFilterTotal = mysql_query( $sQuery, $gaSql['link'] ) or fatal_error( 'MySQL Error: ' . mysql_errno() );
  $aResultFilterTotal = mysql_fetch_array($rResultFilterTotal);
  $iFilteredTotal = $aResultFilterTotal[0];
  
  /* Total data set length */
  $sQuery = "
      SELECT COUNT(".$sIndexColumn.")
      FROM   $sTable
  ";
  $rResultTotal = mysql_query( $sQuery, $gaSql['link'] ) or fatal_error( 'MySQL Error: ' . mysql_errno() );
  $aResultTotal = mysql_fetch_array($rResultTotal);
  $iTotal = $aResultTotal[0];
  
  
  /*
   * Output
   */
  $output = array(
      "sEcho" =&gt; intval($_GET['sEcho']),
      "iTotalRecords" =&gt; $iTotal,
      "iTotalDisplayRecords" =&gt; $iFilteredTotal,
      "aaData" =&gt; array()
  );
  
  while ( $aRow = mysql_fetch_array( $rResult ) )
  {
      $row = array();
      for ( $i=0 ; $i&lt;count($aColumns) ; $i++ )
      {
          if ( $aColumns[$i] == "version" )
          {
              /* Special output formatting for 'version' column */
              $row[] = ($aRow[ $aColumns[$i] ]=="0") ? '-' : $aRow[ $aColumns[$i] ];
          }
          else if ( $aColumns[$i] != ' ' )
          {
              /* General output */
              $row[] = $aRow[ $aColumns[$i] ];
          }
      }
      $output['aaData'][] = $row;
  }
  echo json_encode( $output );
  </code></pre>