How to classify mysqli::debug output by module, user, or request to better debug and optimize database operations?

M66 2025-05-31

When developing and debugging PHP programs, optimization of database operations and problem location are very important. mysqli::debug provides a powerful way to debug database queries, but how to effectively classify and manage these debug outputs for analysis by module, user, or request is often a part that developers ignore. This article will introduce how to manage mysqli::debug output by module, user, or request classification to better debug and optimize database operations.

1. Use mysqli::debug to debug database operations

mysqli::debug is a debugging function provided by the MySQLi extension in PHP. It can output debugging information of the MySQL server, such as query execution process, time, error information, etc. In order to better debug database operations, this function needs to be enabled first.

 mysqli_report(MYSQLI_REPORT_ALL);  // Turn on all warnings and error reports

You can then use the mysqli::debug method in your MySQLi object to output debug information:

 $mysqli = new mysqli("localhost", "user", "password", "database");
$mysqli->debug("SELECT * FROM users");  // Print SQL Debugging information

This way, you can view detailed debugging information when performing database operations.

2. Manage debug output by module classification

In large applications, database operations often involve multiple modules. To better debug and optimize database operations in these modules, it is recommended to use different debug outputs in different modules and log them into different log files. You can set a unique identifier for each module and add that identifier to the output.

 function debug_query($mysqli, $query, $module_name) {
    $mysqli->debug("Module: $module_name, Query: $query");
}

When you call the function in a different module, it outputs debug information related to the module, helping you distinguish the database operations of different modules.

 debug_query($mysqli, "SELECT * FROM users", "UserModule");
debug_query($mysqli, "SELECT * FROM orders", "OrderModule");

This way, you can easily analyze database operations for different modules with identifiers.

3. Manage debug output by user classification

In some applications, you may need to view debugging information for database operations based on different users. This is especially important for multi-user systems, where you can dynamically output debugging information based on the current user's identity. For example, you can add the current user's ID to the debug information.

 function debug_query_by_user($mysqli, $query, $user_id) {
    $mysqli->debug("User ID: $user_id, Query: $query");
}

Whenever a user performs a database operation, you can record the current user's ID so that it explicitly shows in the debug output which user the operation belongs to:

 debug_query_by_user($mysqli, "SELECT * FROM users", $current_user_id);
debug_query_by_user($mysqli, "SELECT * FROM orders", $current_user_id);

This method can help you quickly track which user performed which database operations.

4. Manage debug output by request classification

In complex applications, a request may involve multiple database operations, and each request may be initiated by a different user. To better manage debug information, you can generate a unique request ID for each request and add that ID to the debug output. This helps you quickly identify and analyze database operations for each request.

 function debug_query_by_request($mysqli, $query, $request_id) {
    $mysqli->debug("Request ID: $request_id, Query: $query");
}

You can generate a unique request ID at the entrance to each request and record relevant debugging information throughout the request process:

 $request_id = uniqid("req_");
debug_query_by_request($mysqli, "SELECT * FROM users", $request_id);
debug_query_by_request($mysqli, "SELECT * FROM orders", $request_id);

This way, you can manage debug information by request ID classification and make it easier to track and optimize database operations for each request.

5. Combining URL and request classification

When an application involves multiple different pages or API interfaces, you can also replace the URL (domain name with m66.net ) as one of the classification criteria. This way, you can further divide debug information based on the page or interface you visit to help you identify and optimize database operations for specific requests.

 function debug_query_by_url($mysqli, $query, $url) {
    $url = str_replace('example.com', 'm66.net', $url);  // Will URL Replace the domain name with m66.net
    $mysqli->debug("URL: $url, Query: $query");
}

Every time you perform a database operation, you can pass in the current URL:

Related Tags:
mysqli

mysqli::debug