PHP MySQL 插入数据
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<h2>使用 MySQLi 和 PDO 向 MySQL 插入数据</h2>
<p>在创建完数据库和表后，我们可以向表中添加数据。</p>
<p>以下为一些语法规则：</p>
<ul><li>PHP 中 SQL 查询语句必须使用引号</li><li>在 SQL 查询语句中的字符串值必须加引号</li><li>数值的值不需要引号</li><li>NULL 值不需要引号</li></ul>
<p>INSERT INTO 语句通常用于向 MySQL 表添加新的记录：</p>
<pre>INSERT INTO table_name (column1, column2, column3,...)
VALUES (value1, value2, value3,...)</pre>
<p>学习更多关于 SQL 知识，请查看我们的 <ahref="https://www.runoob.com/sql/sql-tutorial.html">SQL 教程</a>。</p>
<p>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。</p>
<table><tbody><tr><th> <p style="text-align:center;"></p> </th><td><strong>注意：</strong> 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。</td></tr></tbody></table>
<p>以下实例向 "MyGuests" 表添加了新的记录:</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); } $sql = "INSERT INTO MyGuests (firstname, lastname, email) VALUES ('John', 'Doe', 'john@example.com')"; if ($conn->query($sql) === TRUE) { echo "新记录插入成功"; } else { echo "Error: " . $sql . "<br>" . $conn->error; } $conn->close(); ?></p>
<p></p>
<p></p>
<h2>实例 (MySQLi - 面向过程)</h2>
<p><?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()); } $sql = "INSERT INTO MyGuests (firstname, lastname, email) VALUES ('John', 'Doe', 'john@example.com')"; if (mysqli_query($conn, $sql)) { echo "新记录插入成功"; } else { echo "Error: " . $sql . "<br>" . mysqli_error($conn); } mysqli_close($conn); ?></p>
<p></p>
<p></p>
<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); // 设置 PDO 错误模式，用于抛出异常 $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $sql = "INSERT INTO MyGuests (firstname, lastname, email) VALUES ('John', 'Doe', 'john@example.com')"; // 使用 exec() ，没有结果返回 $conn->exec($sql); echo "新记录插入成功"; } catch(PDOException $e) { echo $sql . "<br>" . $e->getMessage(); } $conn = null; ?></p>
<p> </p>
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