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PHP MySQL 数据更新语句


使用 MySQLi 和 PDO 更新 MySQL 表中的数据

UPDATE 语句用于更新表中的现有记录:

UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value 

请注意 UPDATE 语法中的 WHERE 子句。 WHERE 子句规定了哪些记录需要更新。如果您想省去 WHERE 子句,所有的记录都会被更新!

如需学习更多关于 SQL 的知识,请访问我们的 SQL 教程

查看 "MyGuests" 表:

id firstname lastname email reg_date
1 John Doe john@example.com 2014-10-22 14:26:15
2 Mary Moe mary@example.com 2014-10-23 10:22:30

以下示例更新 "MyGuests" 表中 id=2 的记录:

实例 (MySQLi - 面向对象)

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
}
$sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2";
if ($conn->query($sql) === TRUE) {
  echo "Record updated successfully";
} else {
  echo "Error updating record: " . $conn->error;
}

$conn->close();
?>


实例 (MySQLi - 面向过程)

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
  die("Connection failed: " . mysqli_connect_error());
}

$sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2";
if (mysqli_query($conn, $sql)) {
  echo "Record updated successfully";
} else {
  echo "Error updating record: " . mysqli_error($conn);
}

mysqli_close($conn);
?>

实例 (PDO)

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";

try {
  $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
  // set the PDO error mode to exception
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

  $sql = "UPDATE MyGuests SET lastname='Doe' WHERE id=2";
  // Prepare statement
  $stmt = $conn->prepare($sql);

  // execute the query
  $stmt->execute();

  // echo a message to say the UPDATE succeeded
  echo $stmt->rowCount() . " records UPDATED successfully";
} catch(PDOException $e) {
  echo $sql . "<br>" . $e->getMessage();
}
$conn = null;
?>

更新记录后,表将如下所示:

id firstname lastname email reg_date
1 John Doe john@example.com 2014-10-22 14:26:15
2 Mary Doe mary@example.com 2014-10-23 10:22:30