Jquery DataTables - 使用查找表连接表

Posted 2023-05-09

【中文标题】Jquery DataTables - 使用查找表连接表

【英文标题】：Jquery DataTables - Joining tables with lookup table

【发布时间】：2020-02-24 07:59:36

【问题描述】：

我有一个查找（或链接）表learning_event_presentation_lookup：

+---------------------------------------+-------------------+-----------------+
| learning_event_presentation_lookup_pk | learning_event_fk | presentation_fk |
+---------------------------------------+-------------------+-----------------+

这是为了方便连接表 learning_event 和 presentation。

我需要在以下代码的连接中使用该表。

目前我收到错误：

DataTables 警告：表 id=learning_event_table - 发生 SQL 错误：SQLSTATE[42000]：语法错误或访问冲突：1066 Not unique table/alias: 'learning_event'

$( '#learning_event_table' ).DataTable( 
                ajax: "program_data/learning_event_data.php",
                dom: "Bfrtip",
                columns: [ 
                    data: "learning_event.learning_event_name"
                , 
                    data: "learning_event.learning_event_outcome"
                , 
                    data: "rdb_group.rdb_group_name"
                , 
                    data: "presentation.presentation_name"
                , 
                    data: "rotation_discipline_block.rotation_discipline_block_name"
                 ],
                select: 
                    style: 'os',
                    selector: 'td:first-child'
                ,
                buttons: [ 
                    extend: "create",
                    editor: editor
                , 
                    extend: "edit",
                    editor: editor
                , 
                    extend: "remove",
                    editor: editor
                 ]
             );

和

Editor::inst( $db2, 'learning_event', 'learning_event_pk' )   
    ->field(
     Field::inst( 'learning_event.learning_event_name' ),
     Field::inst( 'learning_event.learning_event_outcome' ),
    Field::inst( 'presentation.presentation_name' ),
     Field::inst( 'learning_event.rdb_group_fk' )
            ->options( Options::inst()
                ->table( 'rdb_group' )
                ->value( 'rdb_group_pk' )
                ->label( 'rdb_group_name' )
            )
            ->validator( 'Validate::notEmpty' ),
        Field::inst( 'rdb_group.rdb_group_name' ),
        Field::inst( 'learning_event.rotation_discipline_block_fk' )
            ->options( Options::inst()
                ->table( 'rotation_discipline_block' )
                ->value( 'rotation_discipline_block_pk' )
                ->label( 'rotation_discipline_block_name' )
            )
            ->validator( 'Validate::dbValues' ),
        Field::inst( 'rotation_discipline_block.rotation_discipline_block_name' )

    )
    ->leftJoin( 'rdb_group', 'rdb_group.rdb_group_pk', '=', 'learning_event.rdb_group_fk' )
    ->leftJoin( 'rotation_discipline_block', 'rotation_discipline_block.rotation_discipline_block_pk', '=', 'learning_event.rotation_discipline_block_fk' )
    ->leftJoin( 'presentation', 'presentation.presentation_pk', '=', 'learning_event_presentation_lookup.presentation_fk' )
    ->leftJoin( 'learning_event', 'learning_event.learning_event_pk', '=', 'learning_event_presentation_lookup.learning_event_fk' )
    ->process($_POST)
    ->json();

【问题讨论】：

如果你把它作为一个 sql 你可以弄明白。它说learning_event 以相同的名称连接了两次。

【参考方案1】：

好的，我在以下位置查看了有关使用链接表的文档：

https://editor.datatables.net/examples/advanced/joinLinkTable.html

所以现在我有以下没有产生任何错误并且工作正常。虽然以 dataTables 格式进行连接并不完全直观......

Editor::inst( $db2, 'learning_event', 'learning_event_pk' )   
    ->field(
     Field::inst( 'learning_event.learning_event_name' ),
     Field::inst( 'learning_event.learning_event_outcome' ),
    Field::inst( 'presentation.presentation_name' ),
     Field::inst( 'learning_event.rdb_group_fk' )
            ->options( Options::inst()
                ->table( 'rdb_group' )
                ->value( 'rdb_group_pk' )
                ->label( 'rdb_group_name' )
            )
            ->validator( 'Validate::notEmpty' ),
        Field::inst( 'rdb_group.rdb_group_name' ),
        Field::inst( 'learning_event.rotation_discipline_block_fk' )
            ->options( Options::inst()
                ->table( 'rotation_discipline_block' )
                ->value( 'rotation_discipline_block_pk' )
                ->label( 'rotation_discipline_block_name' )
            )
            ->validator( 'Validate::dbValues' ),
        Field::inst( 'rotation_discipline_block.rotation_discipline_block_name' )

    )
    ->leftJoin( 'rdb_group', 'rdb_group.rdb_group_pk', '=', 'learning_event.rdb_group_fk' )
    ->leftJoin( 'rotation_discipline_block', 'rotation_discipline_block.rotation_discipline_block_pk', '=', 'learning_event.rotation_discipline_block_fk' )
    ->leftJoin( 'learning_event_presentation_lookup', 'learning_event.learning_event_pk', '=', 'learning_event_presentation_lookup.learning_event_fk' )
    ->leftJoin( 'presentation', 'learning_event_presentation_lookup.presentation_fk', '=', 'presentation.presentation_pk' )
    ->process($_POST)
    ->json();