How Can I Join Tables Using ssp.class.php with DataTables?

Joining Tables with ssp.class.php

DataTables Table plug-in for jQuery provides a convenient way to display data in tabular format. However, it does not support joining tables on its own. This can be a limitation when you need to display data from multiple tables.

Joining Tables with SSP

SSP, or server-side processing, is a technique that allows you to process data on the server-side before it is sent to the client. This allows you to perform complex operations, such as joining tables, without having to overload the client-side with the processing.

The ssp.class.php library is a popular PHP library that can be used for server-side processing with DataTables. However, it does not natively support joins. To join tables using ssp.class.php, you need to use a workaround:

1. Create a sub-query that joins the tables: Replace the table name in the $table definition with a sub-query that performs the join.
2. Remove backticks from ssp.class.php: Edit the ssp.class.php file and replace all instances of FROM $table with FROM $table.
3. Use unique column names: Ensure that all column names are unique or assign aliases to avoid conflicts.

Example Implementation

$table = <<<EOT
(
    SELECT 
      a.id, 
      a.name, 
      a.father_id, 
      b.name AS father_name
    FROM table a
    LEFT JOIN table b ON a.father_id = b.id
) temp
EOT;

$primaryKey = 'id';

$columns = array(
   array( 'db' => 'id',          'dt' => 0 ),
   array( 'db' => 'name',        'dt' => 1 ),
   array( 'db' => 'father_id',   'dt' => 2 ),
   array( 'db' => 'father_name', 'dt' => 3 )
);

$sql_details = array(
   'user' => '',
   'pass' => '',
   'db'   => '',
   'host' => ''
);

require 'ssp.class.php';
echo json_encode(
   SSP::simple( $_GET, $sql_details, $table, $primaryKey, $columns )
);

Additional Notes

• Make sure to use the updated ssp.class.php with backticks removed.
• You can use the github.com/emran/ssp repository for an enhanced ssp.class.php with built-in JOIN support.
• For more information, refer to jQuery DataTables: Using WHERE, JOIN and GROUP BY with ssp.class.php.

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