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php实现增删

2026-01-29 15:15:43PHP

PHP 实现数据库增删操作

数据库连接配置

使用 PDO 或 mysqli 扩展连接数据库，推荐 PDO 方式更安全：

$host = 'localhost';
$dbname = 'test_db';
$username = 'root';
$password = '';

try {
    $pdo = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch(PDOException $e) {
    die("Connection failed: " . $e->getMessage());
}

增加数据（INSERT）

使用预处理语句防止 SQL 注入：

php实现增删

$name = 'John Doe';
$email = 'john@example.com';

$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
$stmt->bindParam(':name', $name);
$stmt->bindParam(':email', $email);

if($stmt->execute()) {
    echo "Record inserted successfully";
} else {
    echo "Error inserting record";
}

删除数据（DELETE）

通过 ID 或其他条件删除记录：

php实现增删

$id = 1;

$stmt = $pdo->prepare("DELETE FROM users WHERE id = :id");
$stmt->bindParam(':id', $id);

if($stmt->execute()) {
    echo "Record deleted successfully";
} else {
    echo "Error deleting record";
}

更新数据（UPDATE）

修改现有记录：

$id = 1;
$newEmail = 'newemail@example.com';

$stmt = $pdo->prepare("UPDATE users SET email = :email WHERE id = :id");
$stmt->bindParam(':email', $newEmail);
$stmt->bindParam(':id', $id);

if($stmt->execute()) {
    echo "Record updated successfully";
} else {
    echo "Error updating record";
}

查询数据（SELECT）

获取并显示数据：

$stmt = $pdo->query("SELECT id, name, email FROM users");
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    echo "ID: " . $row['id'] . " - Name: " . $row['name'] . " - Email: " . $row['email'] . "<br>";
}