如何使用mysql数据库在有条件的情况下更新多行？

Question

大家好，我只想问一下。 如何使用条件更新数据库中的多行。 因为我在更新表时遇到问题。 这是我需要做的。 我有2张桌子，一张是ref_cities，一张是ref_draft

在我的ref_cities中有一列

mysql> desc ref_cities
+---------------+--------------+------+-----+---------+-------+
| Field         | Type         | Null | Key | Default | Extra |
+---------------+--------------+------+-----+---------+-------+
| id            | int(11)      | NO   | PRI | NULL    |       |
| name          | varchar(255) | YES  |     | NULL    |       |
| province_id   | int(11)      | YES  |     | NULL    |       |
| province_code | varchar(5)   | YES  |     | NULL    |       |
+---------------+--------------+------+-----+---------+-------+
4 rows in set (0.01 sec)

在我的ref_draft中，我有这个

mysql> desc ref_draft;
+--------------+-------------+------+-----+---------+----------------+
| Field        | Type        | Null | Key | Default | Extra          |
+--------------+-------------+------+-----+---------+----------------+
| id           | int(10)     | NO   | PRI | NULL    | auto_increment |
| municipality | varchar(50) | YES  |     | NULL    |                |
| name         | varchar(50) | YES  |     | NULL    |                |
| city_code    | int(11)     | YES  |     | NULL    |                |
+--------------+-------------+------+-----+---------+----------------+
4 rows in set (0.03 sec)

在我的ref_cities值中（出于示例目的，我仅列出了1行）

mysql> select * from ref_cities where name like '%manila%';
+------+--------+-------------+---------------+
| id   | name   | province_id | province_code |
+------+--------+-------------+---------------+
| 1976 | Manila |          58 | MNL           |
+------+--------+-------------+---------------+
1 row in set (0.00 sec)

在我的ref_draft值中

mysql> select * from ref_draft where municipality like '%manila%';
+-----+----------------+----------------+-----------+
| id  | municipality   | name           | city_code |
+-----+----------------+----------------+-----------+
|   1 | CITY OF MANILA | Barangay 1     |      NULL |
|   2 | CITY OF MANILA | Barangay 2     |      NULL |
|   3 | CITY OF MANILA | Barangay 3     |      NULL |
|   4 | CITY OF MANILA | Barangay 4     |      NULL |
|   5 | CITY OF MANILA | Barangay 5     |      NULL |
|   6 | CITY OF MANILA | Barangay 6     |      NULL |
|   7 | CITY OF MANILA | Barangay 7     |      NULL |
|   8 | CITY OF MANILA | Barangay 8     |      NULL |
|   9 | CITY OF MANILA | Barangay 9     |      NULL |
|  10 | CITY OF MANILA | Barangay 10    |      NULL |
|  11 | CITY OF MANILA | Barangay 11    |      NULL |
|  12 | CITY OF MANILA | Barangay 12    |      NULL |
|  13 | CITY OF MANILA | Barangay 13    |      NULL |
|  14 | CITY OF MANILA | Barangay 14    |      NULL |
|  15 | CITY OF MANILA | Barangay 15    |      NULL |
|  16 | CITY OF MANILA | Barangay 16    |      NULL |

这应该是示例输出

+-----+----------------+----------------+-----------+
| id  | municipality   | name           | city_code |
+-----+----------------+----------------+-----------+
|   1 | CITY OF MANILA | Barangay 1     |      1976 |
|   2 | CITY OF MANILA | Barangay 2     |      1976 |
|   3 | CITY OF MANILA | Barangay 3     |      1976 |
|   4 | CITY OF MANILA | Barangay 4     |      1976 |
|   5 | CITY OF MANILA | Barangay 5     |      1976 |
|   6 | CITY OF MANILA | Barangay 6     |      1976 |
|   7 | CITY OF MANILA | Barangay 7     |      1976 |
|   8 | CITY OF MANILA | Barangay 8     |      1976 |
|   9 | CITY OF MANILA | Barangay 9     |      1976 |
|  10 | CITY OF MANILA | Barangay 10    |      1976 |
|  11 | CITY OF MANILA | Barangay 11    |      1976 |
|  12 | CITY OF MANILA | Barangay 12    |      1976 |
|  13 | CITY OF MANILA | Barangay 13    |      1976 |
|  14 | CITY OF MANILA | Barangay 14    |      1976 |
|  15 | CITY OF MANILA | Barangay 15    |      1976 |
|  16 | CITY OF MANILA | Barangay 16    |      1976 |

但是我知道了

+----+----------------+-------------+-----------+
| id | municipality   | name        | city_code |
+----+----------------+-------------+-----------+
|  1 | CITY OF MANILA | Barangay 1  |      1301 |
|  2 | CITY OF MANILA | Barangay 2  |      1301 |
|  3 | CITY OF MANILA | Barangay 3  |      1301 |
|  4 | CITY OF MANILA | Barangay 4  |      1301 |
|  5 | CITY OF MANILA | Barangay 5  |      1301 |
|  6 | CITY OF MANILA | Barangay 6  |      1301 |
|  7 | CITY OF MANILA | Barangay 7  |      1301 |
|  8 | CITY OF MANILA | Barangay 8  |      1301 |
|  9 | CITY OF MANILA | Barangay 9  |      1301 |
| 10 | CITY OF MANILA | Barangay 10 |      1301 |

条件是首先我将从ref_cities获取名称和ID。 在那之后，接下来我将查找是否在市政列中找到该名称。 如果找到，它将把我的ref_cities中的id插入我的ref_draft中的city_code中。

这是我的用于更新行的PHP代码。 （即使用codeigniter）

<?php

$findCityName = "SELECT id,name FROM ref_cities";
$resultFindCity = $this->db->query($findCityName);

foreach($resultFindCity->result_array() as $row){

        $name = $row['name'];
        //$name = 'Manila';

        $update =  array(
            'city_code' => $row['id']
        );
        $this->db->like('municipality','{$name}');
        $this->db->update('ref_draft',$update);

}
?>

Answer 1

$this->db->like('municipality','{$name}');

应该

$this->db->like('municipality',"{$name}");

要么

$this->db->like('municipality',$name);

在单引号内，变量被视为字符串，而不是实际变量。 要么将其用双引号引起来，要么不使用任何引号。