Me pehea te WHAKAHOU i te patai i roto i te papaunga raraunga MySQL? WHAKAARO te wetereo/whakahau/tauākī

pātengi raraunga MySQLMe pehea te whakahou i tetahi patai? WHAKAARO te wetereo/whakahau/tauākī

MySQL WHAKAARO Uiui

Mena ka hiahia taatau ki te whakarereke, ki te whakahou ranei i nga raraunga i roto i te MySQL, ka taea te whakamahi i te whakahau SQL UPDATE hei mahi. .

wetereo

E whai ake nei te wetereo SQL whanui mo te whakahau UPDATE hei whakarereke i nga raraunga ripanga raraunga MySQL:

UPDATE table_name SET field1=new-value1, field2=new-value2
[WHERE Clause]

• Ka taea e koe te whakahōu kotahi, neke atu rānei ngā āpure i te wā kotahi.
• Ka taea e koe te tohu i tetahi ahuatanga i roto i te rara WHERE.
• Ka taea e koe te whakahou i nga raraunga i te wa kotahi ki te ripanga kotahi.

He tino whai hua te rara WHERE ina hiahia koe ki te whakahou i nga raraunga i te rarangi i tohua i te ripanga raraunga.

Whakahouhia nga raraunga ma te whakahau whakahau

Kei raro nei ka whakamahia e matou te whiti WHERE i te whakahau SQL UPDATE hei whakahou i nga raraunga kua tohua i te ripanga chenweiliang_tbl:

Akoranga

Ko te tauira e whai ake nei ka whakahou i te uara o te mara chenweiliang_title he 3 te chenweiliang_id ki te ripanga raraunga:

mysql> UPDATE chenweiliang_tbl SET chenweiliang_title='学习 C++' WHERE chenweiliang_id=3;
Query OK, 1 rows affected (0.01 sec)
 
mysql> SELECT * from chenweiliang_tbl WHERE chenweiliang_id=3;
+-----------+--------------+---------------+-----------------+
| chenweiliang_id | chenweiliang_title | chenweiliang_author | submission_date |
+-----------+--------------+---------------+-----------------+
| 3 | 学习 C++ | chenweiliang.com | 2016-05-06 |
+-----------+--------------+---------------+-----------------+
1 rows in set (0.01 sec)

Mai i te hua, ko te chenweiliang_title ko tona chenweiliang_id he 3 kua whakarereketia.

Whakahouhia nga raraunga ma te whakamahi i te tuhinga PHP

Ka whakamahia e PHP te mahi mysqli_query() ki te whakahaere i nga korero SQL. Ka taea e koe te whakamahi, kaua ranei e whakamahi i te WHERE rara i roto i nga tauākī SQL UPDATE.

Tuhipoka:Kaua e whakamahia te rara WHERE hei whakahou i nga raraunga katoa i te ripanga raraunga, na kia tupato.

He rite te mana o tenei mahi ki te whakahaere i tetahi korero SQL i roto i te mysql> tono wawe.

Akoranga

Ko te tauira e whai ake nei ka whakahou i nga raraunga o te mara chenweiliang_title ko te chenweiliang_id ko 3.

<?
php
$dbhost = 'localhost:3306'; // mysql服务器主机地址
$dbuser = 'root'; // mysql用户名
$dbpass = '123456'; // mysql用户名密码
$conn = mysqli_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
 die('连接失败: ' . mysqli_error($conn));
}
// 设置编码，防止中文乱码
mysqli_query($conn , "set names utf8");
 
$sql = 'UPDATE chenweiliang_tbl
 SET chenweiliang_title="学习 Python"
 WHERE chenweiliang_id=3';
 
mysqli_select_db( $conn, 'chenweiliang' );
$retval = mysqli_query( $conn, $sql );
if(! $retval )
{
 die('无法更新数据: ' . mysqli_error($conn));
}
echo '数据更新成功！';
mysqli_close($conn);
?>