如何在 ssp.class.php 中使用 JOIN 或子查詢檢索父名稱？

Joining Tables with ssp.class.php to Display Parent Names

In this thread, a user encountered an issue where a DataTables plugin for jQuery failed to retrieve parent names from the same MySQL table, where the connection was established through an external column, "father_id."

Solution:

To resolve this, the user must employ either JOINs or sub-queries to fetch parent names from the same table. As ssp.class.php does not inherently support such operations, a workaround is presented.

Implementation:

Within the table definition, a sub-query is utilized to retrieve not only the required columns but also the parent name by associating the "father_id" with the parent's "name" column. The modified code looks like this:

$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;

In order for the code to function properly, it is imperative that you remove the backticks from all instances of FROM $table in the ssp.class.php file.

Additional Notes:

• Ensure that any column names used in the sub-query are unique to avoid conflicts. If necessary, utilize the AS keyword to assign aliases.
• An enhanced version of ssp.class.php, which supports JOINs, can be found at github.com/emran/ssp.
• More details and examples on implementing this solution can be found at jQuery DataTables: Using WHERE, JOIN and GROUP BY with ssp.class.php.

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