jQuery DataTables: Using WHERE, JOIN and GROUP BY with ssp.class.php

Using WHERE clause

Class ssp.class.php comes with two methods – SSP::simple() and SSP::complex().

Usage of SSP::simple() method is demonstrated in the server_processing.php script.

Method SSP::complex() has two additional arguments $whereResult and $whereAll that allow to add WHERE clause to a query.

  • $whereResult – Condition to apply to result set only

    If you need to apply condition to your dataset and let user know that larger dataset is available, supply your condition using $whereResult argument. jQuery DataTables will show something like Showing 1 to X of X entries (filtered from X total entries) in the information panel.

  • $whereAll – Condition to apply to all queries

    If you need to apply condition to your dataset without letting user know that larger dataset is available, supply your condition using $whereAll argument. jQuery DataTables will show something like Showing 1 to X of X entries in the information panel.

Most of the time you need to apply your condition using $whereAll argument and use null as a value for $whereResult argument.

For example, the following excerpt shows code that produces JSON response while adding WHERE position='Software Developer' clause to the query.


echo json_encode(
   SSP::complex( $_GET, $sql_details, $table, $primaryKey, $columns, null, "position='Software Developer'" )
);

See below excerpt from ssp.class.php for more information on SSP::complex() method.


   /**
    * The difference between this method and the `simple` one, is that you can
    * apply additional `where` conditions to the SQL queries. These can be in
    * one of two forms:
    *
    * * 'Result condition' - This is applied to the result set, but not the
    *   overall paging information query - i.e. it will not effect the number
    *   of records that a user sees they can have access to. This should be
    *   used when you want apply a filtering condition that the user has sent.
    * * 'All condition' - This is applied to all queries that are made and
    *   reduces the number of records that the user can access. This should be
    *   used in conditions where you don't want the user to ever have access to
    *   particular records (for example, restricting by a login id).
    *
    *  @param  array $request Data sent to server by DataTables
    *  @param  array|PDO $conn PDO connection resource or connection parameters array
    *  @param  string $table SQL table to query
    *  @param  string $primaryKey Primary key of the table
    *  @param  array $columns Column information array
    *  @param  string $whereResult WHERE condition to apply to the result set
    *  @param  string $whereAll WHERE condition to apply to all queries
    *  @return array          Server-side processing response array
    */
   static function complex ( $request, $conn, $table, $primaryKey, $columns, $whereResult=null, $whereAll=null )

Using JOIN or GROUP BY clauses

Solution #1

Workaround described below can be used to add support for any complex query not just JOIN or GROUP BY clauses. However it requires modification of original ssp.class.php class.

  • Edit ssp.class.php and replace all instances of FROM `$table` with FROM $table to remove backticks. You will be responsible for escaping your table names if they contain reserved keywords.
  • Use sub-query as table name $table and use any complex query with JOIN, GROUP BY or any other clauses.
    
    <?php
    
    $table = <<<EOT
     (
        SELECT 
          a.id, 
          a.name, 
          b.position
        FROM table a
        LEFT JOIN positions b ON a.position_id = b.id
     ) temp
    EOT;
    
    $primaryKey = 'id';
    
    $columns = array(
       array( 'db' => 'id',          'dt' => 0 ),
       array( 'db' => 'name',        'dt' => 1 ),
       array( 'db' => 'position',    'dt' => 2 )
    );
    
    $sql_details = array(
       'user' => '',
       'pass' => '',
       'db'   => '',
       'host' => ''
    );
    
    require( 'ssp.class.php' );
    echo json_encode(
       SSP::simple( $_GET, $sql_details, $table, $primaryKey, $columns )
    );
    

Solution #2

Alternatively you can try forked version of ssp.class.php created by Emran Ul Hadi, see emran/ssp repository on GitHub.

However the file was forked in May 2014, and hasn’t been kept in sync with minor updates to ssp.class.php since then.

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