MySQL 插入多条数据

PHP MySQL中可以使用mysqli_multi_query()函数来执行多条SQL语句

面向对象

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

// 创建链接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检查链接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com');";
$sql .= "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('Mary', 'Moe', 'mary@example.com');";
$sql .= "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('Julie', 'Dooley', 'julie@example.com')";

if ($conn->multi_query($sql) === TRUE) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();

运行结果
1
新记录插入成功

avatar

面向过程

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<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDB";
 
// 创建链接
$conn = mysqli_connect($servername, $username, $password, $dbname);
// 检查链接
if (!$conn) {
    die("连接失败: " . mysqli_connect_error());
}
 
$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com');";
$sql .= "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('Mary', 'Moe', 'mary@example.com');";
$sql .= "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('Julie', 'Dooley', 'julie@example.com')";
 
if (mysqli_multi_query($conn, $sql)) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
 
mysqli_close($conn);

PDO

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<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myDB";
 
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);
 
    // 开始事务
    $conn->beginTransaction();
    // SQL 语句
    $conn->exec("INSERT INTO MyGuests (firstname, lastname, email) 
    VALUES ('John', 'Doe', 'john@example.com')");
    $conn->exec("INSERT INTO MyGuests (firstname, lastname, email) 
    VALUES ('Mary', 'Moe', 'mary@example.com')");
    $conn->exec("INSERT INTO MyGuests (firstname, lastname, email) 
    VALUES ('Julie', 'Dooley', 'julie@example.com')");
 
    // 提交事务
    $conn->commit();
    echo "新记录插入成功";
}
catch(PDOException $e)
{
    // 如果执行失败回滚
    $conn->rollback();
    echo $sql . "<br>" . $e->getMessage();
}
 
$conn = null;

预处理语句

mysql还提供了第二种方式用于插入语句

可以预处理语句和绑定参数

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

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
} else {
    $sql = "INSERT INTO MyGuests(firstname, lastname, email)  VALUES(?, ?, ?)";

    // 为 mysqli_stmt_prepare() 初始化 statement 对象
    $stmt = mysqli_stmt_init($conn);

    //预处理语句
    if (mysqli_stmt_prepare($stmt, $sql)) {
        // 绑定参数
        mysqli_stmt_bind_param($stmt, 'sss', $firstname, $lastname, $email);

        // 设置参数并执行
        $firstname = 'John';
        $lastname = 'Doe';
        $email = 'john@example.com';
        mysqli_stmt_execute($stmt);

        $firstname = 'Mary';
        $lastname = 'Moe';
        $email = 'mary@example.com';
        mysqli_stmt_execute($stmt);

        $firstname = 'Julie';
        $lastname = 'Dooley';
        $email = 'julie@example.com';
        mysqli_stmt_execute($stmt);
    }
}

总结

  1. 在使用mysqli_multi_query()时，每个SQL语句必须用分号隔开
  2. 在预处理之前，先使用mysqli_stmt_init来初始化statement对象
  3. mysqli_stmt_prepare用于绑定参数
  4. mysqli_stmt_bind_param()该函数绑定参数查询并将参数传递给数据库
  5. 第二个参数是 “sss”，s 字符告诉 mysql 参数是字符串；i是整数；d是双精度浮点数；b是布尔值
  6. mysqli_stmt_execute用于执行预定义语句