Preprocessing methods in php class

In PHP, we can use prepared statements to perform database operations, and prepared statements are generally considered to be a safer, more efficient and more reliable method.

Preprocessed statements are actually a way to process efficiently and prevent SQL injection attacks. When processing prepared statements, the database will first compile the SQL statement, and then bind the parameters to the compiled SQL statement.

In PHP, the preprocessing mechanism is supported by the PDO and mysqli modules. The following are the most commonly used preprocessing methods in the two modules:

1. PDO preprocessing method

PDO is a database abstraction layer of PHP, which supports multiple databases. And provides some built-in methods to complete operations on the database. The PDO preprocessing method is as follows:

// 创建PDO对象
$pdo = new PDO('mysql:host=localhost;dbname=test;', 'root', 'password');

// 准备预处理语句
$stmt = $pdo->prepare("SELECT * FROM users WHERE name = :name AND age = :age");

// 绑定参数
$stmt->bindParam(':name', $name, PDO::PARAM_STR);
$stmt->bindParam(':age', $age, PDO::PARAM_INT);

// 执行预处理语句
$stmt->execute();

In the above code, we first create a PDO object, and then use the prepare() method to prepare prepared statements. We can use placeholders (:name and :age) to replace variables in query conditions. Next, use the bindParam() method to bind the placeholder to the real variable. Finally, use the execute() method to execute the prepared statement.

2. mysqli preprocessing method

Mysqli is an extension module in PHP that interacts with MySQL. It provides some built-in methods to operate on the database. The mysqli preprocessing method is as follows:

// 创建mysqli对象
$mysqli = new mysqli('localhost', 'root', 'password', 'test');

// 准备预处理语句
$stmt = $mysqli->prepare("SELECT * FROM users WHERE name=? AND age=?");

// 绑定参数
$stmt->bind_param('si', $name, $age);

// 执行预处理语句
$stmt->execute();

In this code, we first create a mysqli object, and then use the prepare() method to prepare prepared statements. You can use placeholders (?) to replace variables in query conditions. Use the bind_param() method to bind the placeholder to a real variable. Finally, use the execute() method to execute the prepared statement.

Summary

In PHP, the preprocessing mechanism is a safer, more efficient, and more reliable way to handle database operations. The preprocessing mechanism can avoid SQL injection attacks and improve program execution efficiency. Whether you use PDO or mysqli, you can easily implement preprocessing operations to achieve better program results.

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