获取三层信息:

第1层:信息

该层包含具有UNIQUE自然索引的数据和可轻松转移的代理键.

Table Surnames:

+-----------------------------+--------------+
|    ID (Auto Increment, PK)  |    Surname   |
+-----------------------------+--------------+
|               1             |     Smith    |
|               2             |    Edwards   |
|               3             |     Brown    |
+-----------------------------+--------------+

Table FirstNames

+-----------------------------+--------------+
|   ID (Auto Increment, PK)   |   FirstName  |
+-----------------------------+--------------+
|               1             |     John     |
|               2             |     Bob      |
|               3             |     Mary     |
|               4             |     Kate     |
+-----------------------------+--------------+

自然键

或者,上面的两个表可以没有,ID并使用Surname和FirstName作为自然主键,正如Mike Sherrill所解释的那样.在这种情况下,假设下面的层引用varchar而不是int.

第2层:人

在该层中,使用复合索引.该值可以是UNIQUE或PRIMARY …

我有一个非常奇怪的错误.

在我的本地xampp的环境中,删除操作工作得很好,代码完全相同,数据库相同......但是托管它不起作用.

码:

<!-- Bootstrap core JavaScript
    ================================================== -->
    <!-- Placed at the end of the document so the pages load faster -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

    <script src="//cdn.datatables.net/1.10.9/js/jquery.dataTables.min.js"></script>
    <script src="https://cdn.datatables.net/1.10.9/js/dataTables.bootstrap.min.js"></script>
    <script src="https://cdn.datatables.net/responsive/2.0.0/js/dataTables.responsive.min.js"></script>

    <script>
      $.ajaxSetup({
          headers: {
              'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
          }
      });
    </script>    

        <script type="text/javascript">
        var theGrid = null;
        $(document).ready(function(){
            theGrid = $('#thegrid').DataTable({
                "processing": true,
                "serverSide": true,
                "ordering": true,
                "responsive": true,
                "ajax": "http://eindeks.000webhostapp.com/przedmioties/grid",
                "columnDefs": [
                    {
                        "render": function ( data, type, row ) {
                            return '<a href="http://eindeks.000webhostapp.com/przedmioties/'+row[0]+'">'+data+'</a>';
                        },
                        "targets": 1
                    }, …