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[英]mysql join query for select rows from two tables that one table is having multiple rows matching to the first table
[英]Join one row from a table with multiple rows of two other tables in MySQL using Codeigniter
我见过其他类似的问题,但对我想做的事情没有真正帮助。
我有三张桌子。 sites
, user_sites
和site_domains
。 我想从user_sites
和site_domains
表中查询站点以及用户和域的列表。 这是表的示例:
db.sites
+------+-------------+---------------------+--------------+
| id | site_name | site_options | created_on |
+------+-------------+---------------------+--------------+
| 1 | name1 | {serialized data} | 10/10/12 |
+------+-------------+---------------------+--------------+
| 2 | name2 | {serialized data} | 24/10/12 |
+------+-------------+---------------------+--------------+
| 3 | name3 | {serialized data} | 08/09/12 |
+------+-------------+---------------------+--------------+
| 4 | name4 | {serialized data} | 03/01/12 |
+------+-------------+---------------------+--------------+
| 5 | name5 | {serialized data} | 10/12/11 |
+------+-------------+---------------------+--------------+
db.user_sites
+------+-----------+-----------+-----------+
| id | user_id | site_id | default |
+------+-----------+-----------+-----------+
| 1 | 1 | 1 | 0 |
+------+-----------+-----------+-----------+
| 2 | 3 | 2 | 0 |
+------+-----------+-----------+-----------+
| 3 | 1 | 3 | 0 |
+------+-----------+-----------+-----------+
| 4 | 10 | 1 | 0 |
+------+-----------+-----------+-----------+
| 5 | 5 | 1 | 1 |
+------+-----------+-----------+-----------+
db.site_domains
+------+-----------+-------------------+
| id | site_id | site_domain |
+------+-----------+-------------------+
| 1 | 1 | www.domain1.com |
+------+-----------+-------------------+
| 2 | 1 | sub.domain2.com |
+------+-----------+-------------------+
| 3 | 3 | www.domain3.com |
+------+-----------+-------------------+
| 4 | 2 | www.domain4.com |
+------+-----------+-------------------+
| 5 | 3 | www.domain5.com |
+------+-----------+-------------------+
完成后。 我希望能够填充这样的对象:
array (
[1] => array (
[site_name] => 'Name1',
[created_on] => '10/10/12',
[site_options] => {serialized data},
[domains] => array (
[0] => 'www.domain1.com',
[1] => 'www.domain2.com'
),
[users] => array (
[0] => 1,
[1] => 10,
[2] => 5
)
),
[2] => array (
[site_name] => 'Name2',
[created_on] => '24/10/12',
[site_options] => {serialized data},
[domains] => array (
[0] => 'www.domain4.com'
),
[users] => array (
[0] => 3
)
)
)
....等等。
我正在使用Codeigniter创建我的应用程序,但是如果我只知道SQL,可以将其转换为使用Codeigniter。 SQL不是我的最佳选择,但是任何帮助将不胜感激。
如果您使用的是ActiveRecord,则交叉表查询的语法非常简单:
$this->db->select('sites.site_name');
$this->db->from('sites');
$this->db->join('sites', 'sites.id = user_sites.user_id');
$data['query'] = $this->db->get();
显然,这并不是确切的查询,因为我不知道您要在数据之间寻找什么关系,但希望您能理解。
我认为您真的很难将其纳入一个查询。
我还没有测试过,但是类似的东西可能会给你带来一些好处:
function get_site_data() {
$sites = $this->db->get('sites')->result();
foreach ($sites as &$row)
{
$row['domains'] = $this->get_domains_for_site($row->id);
$row['users'] = $this->get_users_for_site($row->id);
}
return $sites;
}
function get_domains_for_site($site_id) {
return $this->db->get_where("site_domains", array("site_id" => $site_id))->result();
}
function get_users_for_site($site_id) {
return $this->db->get_where("user_sites", array("site_id" => $site_id))->result();
}
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