若是咱们须要修改或更新MySQL中的数据,咱们可使用 SQL UPDATE 命令来操做。
语法:
如下是UPDATE命令修改MySQL数据表数据的SQL语法:php
UPDATE table_name SET field1=new-value1, field2=new-value2
[WHERE Clause]
实例
如下实例是更新数据表中runoob_id为3的runoob_title字段值mysql
root@host# mysql -u root -p password;
Enter password:*******
mysql> use RUNOOB;
Database changed
mysql> UPDATE runoob_tbl
-> SET runoob_title='Learning JAVA' -> WHERE runoob_id=3; Query OK, 1 row affected (0.04 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql>
使用PHP脚本更新数据web
<?php
$dbhost = 'localhost:3306';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn=mysql_connect($dbhost,$dbuser,$dbpass);
if(! $conn)
{
die('Could not connect:'.mysql_error());
}
$sql='UPDATE runoob_tbl SET runoob_title="Learing JAVA" WHERE runoob_id=3';
mysql_select_db('RUNOOB');
$retval =mysql_query($sql,$conn);
if(! $retval)
{
die('Could not update data:'.mysql_error());
}
echo "Updated data succeddfully\n";
mysql_close($conn);
?>
你可使用 SQL 的 DELETE FROM 命令来删除 MySQL 数据表中的记录。
也能够在mysql>命令提示符或PHP脚本中执行该命令。sql
实例ruby
root@host# mysql -u root -p password;
Enter password:*******
mysql> use RUNOOB;
Database changed
mysql> DELETE FROM runoob_tbl WHERE runoob_id=3;
Query OK, 1 row affected (0.23 sec)
mysql>
使用 PHP 脚本删除数据svg
<?php
$dbhost = 'localhost:3306';
$dbuser = 'root';
$dbpass = 'rootpassword';
$conn = mysql_connect($dbhost, $dbuser, $dbpass);
if(! $conn )
{
die('Could not connect: ' . mysql_error());
}
$sql = 'DELETE FROM runoob_tbl WHERE runoob_id=3';
mysql_select_db('RUNOOB');
$retval = mysql_query( $sql, $conn );
if(! $retval )
{
die('Could not delete data: ' . mysql_error());
}
echo "Deleted data successfully\n";
mysql_close($conn);
?>