数据表服务器端处理INNER JOIN或多个表 [英] Datatables server-side processing INNER JOIN or multiple tables

问题描述

下面是我的代码，没有服务器端处理，但是由于它会产生很多行，并且会大大增长，因此我需要使用服务器端处理.

Below is my code without server-side processing but as it produces many rows and will grow considerably I need to use server-side processing.

数据库表(不包括所有字段，但这些是我想要的字段，并且是INNER JOIN的字段):

DB Tables (not all fields included but these are the ones i want and the fields to INNER JOIN):

course_modules -       id (pk), course(course.id), module(module.id), added(UNIXTIMESTAMP)
course -               id (pk), category(course_categories.id), fullname(text)
course_categories-     id (pk), name(text)
modules-               id (pk), name(text)

我希望能够将UNIXTIMESTAMP显示为date('d/m/Y');

I want to be able to display the UNIXTIMESTAMP as date('d/m/Y');

这项工作对INNER JOIN有用吗

Would this work for the INNER JOIN

$sQuery = "
    SELECT SQL_CALC_FOUND_ROWS ".str_replace(" , ", " ", implode(", ", $aColumns))."
    FROM   $sTable 
    INNER JOIN modules ON $sTable.module = modules.id 
    INNER JOIN course ON $sTable.course = course.id 
    INNER JOIN course_categories ON course.category = course_categories.id
    $sWhere
    $sOrder
    $sLimit
";

---

未经服务器端处理的原始php版本:

---

Original php version without server-side processing:

$mods = get_records_sql("SELECT * FROM {$CFG->prefix}course_modules");

foreach ($mods as $mod)
    {

    $thecourse = get_record('course','id',$mod->course); 
    $themodule = get_record('modules','id',$mod->module); 
    $thecat = get_record('course_categories','id',$thecourse->category); 


    echo '<tr>'; 
    echo '<td>'.$thecat->name.'</td>'; 
    echo '<td>'.$thecourse->fullname.'</td>'; 
    echo '<td>'.$themodule->name.'</td>'; 
    echo '<td>';
    echo date('d/m/Y', $mod->added);
    echo'</td>'; 
    echo '</tr>'; 
    } 

我的服务器端处理可以很好地处理我的数据表，但没有链接到其他表.该表仅返回ID，如上所述，我希望能够从另一个表中获取值.

I have server-side processing woking fine with my datatables but without linking to the other tables. This table only returns IDs and I want to be able to get the value from another table as demonstrated above.

我需要使用内部联接吗?如果是这样，我如何与server_processing.php脚本合并: 我使用了这个: http://datatables.net/release-datatables/examples/data_sources/server_side.html

Do I need to use an innner join? If so how can I incorporate with server_processing.php script: I used this one: http://datatables.net/release-datatables/examples/data_sources/server_side.html

或者我可以将上述方法合并到server_processing.php中.

Or can I incorporate my above method within server_processing.php.

任何指导将不胜感激. 预先感谢.

Any guidance would be greatly appreciated. Thanks in advance.

推荐答案

该问题的答案: 问题是2列名称相同，所以我在SQL查询中使用了别名. 也没有使用INNER JOIN.

Answer to the question: Problem was had 2 column names the same so i used alises in the SQL query. Also did not use INNER JOIN.

使用别名和列名的Columns数组:

Columns array using the alias names and column names:

$aColumns = array( 'catname', 'fullname', 'modulename', 'added');

4个表的SQL查询:

The SQL query for the 4 tables:

$sQuery = "
    SELECT mdl_course.fullname, mdl_modules.name AS modulename, mdl_course_categories.name AS catname, mdl_course_modules.added
    FROM  mdl_course_modules, mdl_modules, mdl_course, mdl_course_categories
    WHERE mdl_course_modules.module = mdl_modules.id AND mdl_course_modules.course = mdl_course.id AND mdl_course.category = mdl_course_categories.id
    $sOrder
    $sLimit
";
$rResult = mysql_query( $sQuery, $gaSql['link'] ) or die(mysql_error());

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