PHP MySQL 插入多条数据
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<h2>使用 MySQLi 和 PDO 向 MySQL 插入多条数据</h2>
<p>mysqli_multi_query() 函数可用来执行多条SQL语句。</p>
<p>以下实例向 "MyGuests" 表添加了三条新的记录:</p>
<h2>实例 (MySQLi - 面向对象)</h2>
<p><?php $servername = "localhost"; $username = "username"; $password = "password"; $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(); ?></p>
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<table><tbody><tr><th> <p style="text-align:center;"></p> </th><td>请注意，每个SQL语句必须用分号隔开。</td></tr></tbody></table>
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<h2>实例 (MySQLi - 面向过程)</h2>
<p><?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', '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); ?></p>
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<h2>实例 (PDO)</h2>
<p><?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); // 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; ?></p>
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<h2>使用预处理语句</h2>
<p>mysqli 扩展提供了第二种方式用于插入语句。</p>
<p>我们可以预处理语句及绑定参数。</p>
<p>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。</p>
<h2>实例 (MySQLi 使用预处理语句)</h2>
<p><?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("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); } } ?></p>
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<p>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。</p>
<p>注意参数的绑定。让我们看下 mysqli_stmt_bind_param() 中的代码：</p>
<pre>mysqli_stmt_bind_param($stmt, 'sss', $firstname, $lastname, $email);</pre>
<p>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。</p>
<p>可以是以下四种参数:</p>
<ul><li>i - 整数</li><li>d - 双精度浮点数</li><li>s - 字符串</li><li>b - 布尔值</li></ul>
<p>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。</p>
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