PHP MySQL 插入数据

使用 MySQLi 和 PDO 向 MySQL 插入数据

在创建完数据库和表后,我们可以向表中添加数据。

以下为一些语法规则:

  • PHP 中 SQL 查询语句必须使用引号
  • 在 SQL 查询语句中的字符串值必须加引号
  • 数值的值不需要引号
  • NULL 值不需要引号

INSERT INTO 语句通常用于向 MySQL 表添加新的记录:

INSERT INTO table_name (column1, column2, column3,...)  
VALUES (value1, value2, value3,...)

学习更多关于 SQL 知识,请查看我们的 SQL 教程

在前面的几个章节中我们已经创建了表 "MyGuests",表字段有: "id", "firstname", "lastname", "email" 和 "reg_date"。 现在,让我们开始向表填充数据。

注意: 如果列设置 AUTO_INCREMENT (如 "id" 列) 或 TIMESTAMP (如 "reg_date" 列),,我们就不需要在 SQL 查询语句中指定值; MySQL 会自动为该列添加值。

以下实例向 "MyGuests" 表添加了新的记录:

实例 (MySQLi - 面向对象)

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

// 创建连接  
$conn = new mysqli($servername, $username, $password, $dbname);  
// 检测连接  
if ($conn->connect_error) {  
    die("Connection failed: " . $conn->connect_error);  
}  

$sql = "INSERT INTO MyGuests (firstname, lastname, email)  
VALUES ('John', 'Doe', '[email protected]')";  

if ($conn->query($sql) === TRUE) {  
    echo "New record created successfully";  
} else {  
    echo "Error: " . $sql . "<br>" . $conn->error;  
}  

$conn->close();  
?>

实例 (MySQLi - 面向过程)

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

// 创建连接  
$conn = mysqli_connect($servername, $username, $password, $dbname);  
// 检测连接  
if (!$conn) {  
    die("Connection failed: " . mysqli_connect_error());  
}  

$sql = "INSERT INTO MyGuests (firstname, lastname, email)  
VALUES ('John', 'Doe', '[email protected]')";  

if (mysqli_query($conn, $sql)) {  
    echo "New record created successfully";  
} else {  
    echo "Error: " . $sql . "<br>" . mysqli_error($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 = "INSERT INTO MyGuests (firstname, lastname, email)  
    VALUES ('John', 'Doe', '[email protected]')";  
    // use exec() because no results are returned  
    $conn->exec($sql);  
    echo "New record created successfully";  
    }  
catch(PDOException $e)  
    {  
    echo $sql . "<br>" . $e->getMessage();  
    }  

$conn = null;  
?>