更新数据在一个MySQL表使用的MySQLi和PDO
UPDATE语句用来更新表中现有的记录：
UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value
请注意在UPDATE语法WHERE子句：WHERE子句指定哪些记录或应该更新记录。 如果省略WHERE子句，所有记录都将被更新！
要了解更多有关SQL，请访问我们的SQL教程 。
让我们来看看"MyGuests"表：
| ID | 名字 | 姓 | 电子邮件 | reg_date |
|---|---|---|---|---|
| 1 | 约翰 | 母鹿 | [email protected] | 2014年10十四时26分15秒 |
| 2 | 玛丽 | 萌 | [email protected] | 2014年10月23日十时22分30秒 |
下面的实施例在更新与ID = 2的记录"MyGuests"表：
实施例(MySQLi Object-oriented)
<?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();
?>
实施例(MySQLi Procedural)
<?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);
?>
实施例(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;
?>
记录更新后，该表将是这样的：
| ID | 名字 | 姓 | 电子邮件 | reg_date |
|---|---|---|---|---|
| 1 | 约翰 | 母鹿 | [email protected] | 2014年10十四时26分15秒 |
| 2 | 玛丽 | 母鹿 | [email protected] | 2014年10月23日十时22分30秒 |