1. 连接到数据库:
<?php
$servername = "localhost"; // 数据库服务器地址
$username = "your_username"; // 数据库用户名
$password = "your_password"; // 数据库密码
$dbname = "your_database"; // 数据库名
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// 设置 PDO 错误模式为异常
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "连接成功";
} catch(PDOException $e) {
echo "连接失败: " . $e->getMessage();
}
?>
2. 执行查询:
<?php
try {
$stmt = $conn->prepare("SELECT id, name, email FROM your_table");
$stmt->execute();
// 设置结果集为关联数组
$result = $stmt->setFetchMode(PDO::FETCH_ASSOC);
// 输出数据
foreach($stmt->fetchAll() as $row) {
echo "ID: " . $row["id"]. " - Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>";
}
} catch(PDOException $e) {
echo "查询失败: " . $e->getMessage();
}
?>
3. 插入数据:
<?php
try {
$name = "John Doe";
$email = "john@example.com";
$stmt = $conn->prepare("INSERT INTO your_table (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);
$stmt->execute();
echo "新记录插入成功";
} catch(PDOException $e) {
echo "插入失败: " . $e->getMessage();
}
?>
确保替换代码中的 "your_username"、"your_password"、"your_database" 和 "your_table" 等信息为实际数据库信息。使用PDO的好处之一是可以轻松地切换到其他数据库系统,只需修改连接字符串即可。
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