如何在数据表的 ssp.class.php 中使用 group by 子句

2022-01-01 00:00:00 datatables php mysql

sql 应该是

select max(id),Staff_name from position group by Staff_name

我修改了ssp.class.php.

SELECT SQL_CALC_FOUND_ROWS ".implode(", ", self::pluck($columns, 'db'))."
FROM $table
$where
$order
$limit group by Staff_name.

然而，它不起作用.这个sql怎么实现?

However, it dose not work. How to realize this sql?

推荐答案

SOLUTION

Class ssp.class.php 不支持 JOIN、GROUP BY 或子查询，但有一个解决方法.诀窍是在服务器端处理脚本 (server_processing.php) 中的 $table 定义中使用如下所示的子查询.

SOLUTION

Class ssp.class.php doesn't support JOIN, GROUP BY or sub-queries, but there is a workaround. The trick is to use sub-query as shown below in $table definition in you server-side processing script (server_processing.php).

例如:

$table = <<<EOT
 (
    SELECT 
      MAX(id),
      Staff_name
    FROM position 
    GROUP BY Staff_name
 ) temp
EOT;

$primaryKey = 'id';

$columns = array(
   array( 'db' => 'id', 'dt' => 0 ),
   array( 'db' => 'Staff_name',  'dt' => 1 )
);

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

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

您还需要编辑 ssp.class.php 并将 FROM `$table` 的所有实例替换为 FROM $table 以删除反引号.

You also need to edit ssp.class.php and replace all instances of FROM `$table` with FROM $table to remove backticks.

还有 github.com/emran/ssp 存储库，其中包含增强的 ssp.class.php 支持 JOIN 和 GROUP BY.

There is also github.com/emran/ssp repository that contains enhanced ssp.class.php supporting JOIN and GROUP BY.

参见 jQuery DataTables:使用 WHERE、JOIN 和 GROUP BY 与 ssp.class.php 了解更多信息.

See jQuery DataTables: Using WHERE, JOIN and GROUP BY with ssp.class.php for more information.

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