如何在不同表的数据表的单元格中呈现多行? [英] How to render multiple row in a cell in Datatables from a different table?
问题描述
我正在使用数据表创建表,但是在呈现数据时遇到了一些麻烦.我的表格结构是.
I am creating a table using datatables and I am having some trouble rendering data in it. My Table structures are.
TABLE_1
|------|------|-------|
| ID | NAME | PHONE |
|------|------|-------|
TABLE_2
|------|------------|----------|
| ID | TABLE_1_ID | CATEGORY |
|------|------------|----------|
这是我的PHP代码
$db = new Database; // Database connection
$sql = "SELECT a.*, b.* FROM TABLE_1 a, TABLE_2 b WHERE a.ID = b.TABLE_1_ID";
$exe = $db->select($sql);
$result = array();
foreach ($exe as $rows) {
$result[] = $rows;
}
echo json_encode($result);
这是我的JavaScript
This is my JavaScript
$('#example').DataTable({
ajax: {
url:"data.php",
dataSrc:""
},
columns: [
{data:"NAME"},
{data:"CATEGORY"}
]
});
到目前为止,一切正常,数据已完美加载.但是问题是,假设我在TABLE_1
中只有一行,而在TABLE_2
中只有5行,其中我的数据表的TABLE_1.ID = TABLE_2.TABLE_1_ID
和bcoz正在生成5行,但是我希望所有类别都在一个单元格中,并且我只想要一行而不是5.
Up to this point everything is working fine, the data is perfectly loaded. But the problem is, suppose I have only one row in TABLE_1
and 5 rows in TABLE_2
where TABLE_1.ID = TABLE_2.TABLE_1_ID
and bcoz of this my datatable is generating 5 rows but I want all the categories in a single cell and I want only one row instead of 5.
我正在考虑在render函数中做一些事情,例如
I am thinking of doing some stuff inside the render function, like
$('#example').DataTable({
ajax: {
url:"data.php",
dataSrc:""
},
columns: [
{data:"NAME"},
{
data:"ID",
render: function(data, type, row){
// Some stuff to render 5 Category in a single cell
// Using the ID from row.ID (maybe)
// how to return 5 CATEGORY in this cell
}
}
]
});
但是我真的不知道这个过程,而google + stackoverflow + datatables论坛对我来说有点混乱bcoz我的Java语言不好. 你们可以帮我实现这一目标吗?为了在单个单元格中显示5个类别,我必须在呈现功能中编写哪种类型的代码或编写什么代码. 预先感谢.
But I really don't know the process and google + stackoverflow + datatables forum is little bit confusing for me bcoz I am not good in Javascript. Can you guys help me achieve this? What type of code or what code I have to write inside the render finction to display 5 CATEGORY in a single cell. Thanks in advance.
推荐答案
您可以在应用程序层中转换数据,以便在结果数组中仅包含表a的行以及相关的类别名称.
You can transform your data in your application layer so that in resultant array you will have only rows for table a along with related category names.
首先,您需要一个有序的结果集,例如
First you need an ordered result set like
select a.id,
a.phone,
a.name,
b.category
from table_1 a
join table_2 b
on a.id = b.table_1_id
order by a.id asc
然后遍历所有记录并烹饪数据集
Then loop through all records and cook your data set
$result = [];
$currentParent = false;
$data = null;
foreach ($rows as $row) {
/*
* if id is changed then its a different record
* prepare data for new row and create a comma separated string of category names
*/
if ($currentParent != $row['id']) {
if($data != null){ // for first and intermediate rows
$result[]= $data;
}
$data = ['name'=> $row['name'], 'category'=> ''];
$currentParent = $row['id'];
}
$data['category'] = empty($data['category']) ? $row['category']: $data['category'] .", ". $row['category'];
}
$result[]= $data; // add data for last row
echo json_encode($result);
结果数组看起来像
Array
(
[0] => Array
(
[name] => item 1
[category] => Cat 1, Cat 2, Cat3
)
[1] => Array
(
[name] => item 2
[category] => Cat 1, Cat 2, Cat3
)
[2] => Array
(
[name] => item 3
[category] => Cat 1, Cat 2, Cat3
)
)
另一种速记方法(但不是首选方法)是在查询级别应用聚合方法,例如,如果您使用的是MySQL,则可以使用
Another shorthand way but not preferred is to apply aggregate methods on query level like if you are using MySQL you can use group_concat
but it has a restriction of max character limit (which is adjustable).
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