使用 MySQLi 和 PDO 向 MySQL 插入多条数据
mysqli_multi_query() 函数可用来执行多条SQL语句。
以下实例向 "MyGuests" 表添加了三条新的记录:
实例 (MySQLi - 面向对象)
<?php$servername= "localhost";$username= "username";$password= "password";$dbname= "myDB"; //创建链接$conn= newmysqli($servername, $username, $password, $dbname);//检查链接if($conn->connect_error){ die("连接失败: ". $conn->connect_error);} $sql= "INSERT INTO MyGuests (firstname, lastname, email)VALUES ('John', 'Doe', '[email protected]');";$sql.= "INSERT INTO MyGuests (firstname, lastname, email)VALUES ('Mary', 'Moe', '[email protected]');";$sql.= "INSERT INTO MyGuests (firstname, lastname, email)VALUES ('Julie', 'Dooley', '[email protected]')"; if($conn->multi_query($sql)=== TRUE){ echo"新记录插入成功";}else{ echo"Error: ". $sql. "<br>". $conn->error;} $conn->close();?> | 请注意，每个SQL语句必须用分号隔开。 |
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实例 (MySQLi - 面向过程)
<?php$servername= "localhost";$username= "username";$password= "password";$dbname= "myDB"; //创建链接$conn= mysqli_connect($servername, $username, $password, $dbname);//检查链接if(!$conn){ die("连接失败: ". mysqli_connect_error());} $sql= "INSERT INTO MyGuests (firstname, lastname, email)VALUES ('John', 'Doe', '[email protected]');";$sql.= "INSERT INTO MyGuests (firstname, lastname, email)VALUES ('Mary', 'Moe', '[email protected]');";$sql.= "INSERT INTO MyGuests (firstname, lastname, email)VALUES ('Julie', 'Dooley', '[email protected]')"; if(mysqli_multi_query($conn, $sql)){ echo"新记录插入成功";}else{ echo"Error: ". $sql. "<br>". mysqli_error($conn);} mysqli_close($conn);?>实例 (PDO)
<?php$servername= "localhost";$username= "username";$password= "password";$dbname= "myDBPDO"; try{ $conn= newPDO("mysql:host=$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', '[email protected]')"); $conn->exec("INSERT INTO MyGuests (firstname, lastname, email) VALUES ('Mary', 'Moe', '[email protected]')"); $conn->exec("INSERT INTO MyGuests (firstname, lastname, email) VALUES ('Julie', 'Dooley', '[email protected]')"); //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();} $conn= null;?>使用预处理语句
mysqli 扩展提供了第二种方式用于插入语句。
我们可以预处理语句及绑定参数。
mysql 扩展可以不带数据发送语句或查询到mysql数据库。 你可以向列关联或 "绑定" 变量。
实例 (MySQLi 使用预处理语句)
<?php$servername= "localhost";$username= "username";$password= "password";$dbname= "myDB"; //创建连接$conn= newmysqli($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'; $email= '[email protected]'; mysqli_stmt_execute($stmt); $firstname= 'Mary'; $lastname= 'Moe'; $email= '[email protected]'; mysqli_stmt_execute($stmt); $firstname= 'Julie'; $lastname= 'Dooley'; $email= '[email protected]'; mysqli_stmt_execute($stmt); }}?>我们可以看到以上实例中使用模块化来处理问题。我们可以通过创建代码块实现更简单的读取和管理。
注意参数的绑定。让我们看下 mysqli_stmt_bind_param() 中的代码：
mysqli_stmt_bind_param($stmt, 'sss', $firstname, $lastname, $email);
该函数绑定参数查询并将参数传递给数据库。第二个参数是 "sss" 。以下列表展示了参数的类型。 s 字符告诉 mysql 参数是字符串。
可以是以下四种参数:
i - 整数
d - 双精度浮点数
s - 字符串
b - 布尔值
每个参数必须指定类型，来保证数据的安全性。通过类型的判断可以减少SQL注入漏洞带来的风险。
