PHP MySQL 更新数据
使用 MySQLi 和 PDO 更新 MySQL 表中的数据
UPDATE 语句用于更新表中已有的记录
UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value
注意 UPDATE 语法中的 WHERE 子句: WHERE 子句指定应更新的记录。 如果省略 WHERE 子句,所有记录都将被更新!
要了解有关 SQL 的更多信息,请访问我们的 SQL 教程。
让我们看一下 "MyGuests" 表
id | firstname | lastname | reg_date | |
---|---|---|---|---|
1 | John | Doe | [email protected] | 2014-10-22 14:26:15 |
2 | Mary | Moe | [email protected] | 2014-10-23 10:22:30 |
以下示例更新 "MyGuests" 表中 id=2 的记录
示例(MySQLi 面向对象)
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查连接
if ($conn->connect_error) {
die("连接失败: " . $conn->connect_error);
}
$sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2";
if ($conn->query($sql) === TRUE) {
echo "记录更新成功";
} else {
echo "更新记录出错: " . $conn->error;
}
$conn->close();
?>
示例(MySQLi 过程化)
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 创建连接
$conn = mysqli_connect($servername, $username, $password, $dbname);
// 检查连接
if (!$conn) {
die("连接失败: " . mysqli_connect_error());
}
$sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2";
if (mysqli_query($conn, $sql)) {
echo "记录更新成功";
} else {
echo "更新记录出错: " . mysqli_error($conn);
}
mysqli_close($conn);
?>
示例(PDO)
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// 将 PDO 错误模式设置为异常
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2";
// 准备语句
$stmt = $conn->prepare($sql);
// 执行查询
$stmt->execute();
// 输出更新成功的提示
echo $stmt->rowCount() . " 条记录成功更新";
} catch(PDOException $e) {
echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>
更新记录后,表格将显示如下:
id | firstname | lastname | reg_date | |
---|---|---|---|---|
1 | John | Doe | [email protected] | 2014-10-22 14:26:15 |
2 | Mary | Doe | [email protected] | 2014-10-23 10:22:30 |