How to handle errors in query results in PHP?

Handling errors in query results in PHP is critical to ensuring the robustness and reliability of your application. Errors can be easily detected and handled by adopting best practices: 1. Use the errorInfo() method to return an array containing the error code and message. 2. Use the exception object to get detailed information about the error. 3. Get the error message associated with the last result with the help of the mysql_error() or mysqli_error() function. Best practices include always checking for errors, using standardized error handling mechanisms (such as PDO or the MySQLi API), logging errors, and providing meaningful feedback to users.

Handling errors in query results in PHP

It is important to handle errors in query results in PHP to Ensure application robustness and reliability. By adopting a few best practices, errors can be easily detected and handled for the best development experience.

Error handling methods

PHP provides a variety of methods to handle errors in query results, including:

• errorInfo () method: This method returns an array containing the error code and message.
• exception object: The PDO_Exception class provides detailed information about the error.
• mysql_error() or mysqli_error() function: These functions return the error message associated with the آخرین آخرین result.

Practical Case

Consider the following example showing how to use the errorInfo() method to handle errors:

$conn = new PDO('mysql:host=localhost;dbname=my_database', 'username', 'password');
$stmt = $conn->query('SELECT * FROM users WHERE id = 1');

if ($stmt->errorInfo()[0] != '00000') {
    echo '错误代码：' . $stmt->errorInfo()[0] . "\n";
    echo '错误消息：' . $stmt->errorInfo()[2] . "\n";
} else {
    // 执行成功，处理查询结果
}

Best Practice

When handling errors in query results, it is recommended to follow the following best practices:

• Always check for errors: Always check on query results error, even if you expect no error.
• Use PDO or MySQLi API: These APIs provide standardized error handling mechanisms.
• Logging errors: Log errors to a file or database for troubleshooting purposes.
• Provide meaningful feedback to users: Provide users with a clear description of the error so they understand the problem and act accordingly.

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