When using PHP’s mysqli extension to connect to a MySQL database, connection failures are quite common. Typically, we check the connection error code and message to determine the root cause. However, sometimes we also want to retrieve some server information—like the MySQL server version—to assist in diagnosis.

This article discusses the common causes of mysqli::$server_info returning an empty value, provides solutions to common errors, and offers improved code examples.

When using PHP's mysqli extension for database operations, the multi_query function allows us to execute multiple SQL statements at once, which is very convenient when batch processing of data. However, after executing multiple statements, how to correctly obtain the affected number of rows (affected_rows) has become a common question.

What Does mysqli::$affected_rows Returning -1 Mean? Essential Cases You Must Know

1. mysqli::$affected_rows 的基本用法 <?php $mysqli = new mysqli("gitbox.net", "username", "password", "database"); $sql = "INSERT INTO users (username, email) VALUES ('testuser', '[email protected]')"; $mysqli->query($sql); echo

The mysqli::kill function is used to terminate a running MySQL connection. When working with MySQL databases, especially in high-concurrency environments, there may be situations where you need to kill a specific connection. This function essentially closes a particular MySQL connection by its connection ID, helping to prevent performance degradation caused by long-running queries or other issues. However, although mysqli::kill is useful in certain scenarios, it carries security risks if misused.

Does using mysqli::kill cause connection disruption? The correct way to avoid exceptions

This section of code is unrelated to the main content and is just an example of starting code

How to Use mysqli::init and mysqli::real_connect Functions Together to Establish a Database Connection

1. Understand the role of mysqli::get_warnings. Mysqli::get_warnings is used to obtain warnings generated by the latest MySQL operation. Compared to errors, warnings often do not affect the execution of SQL statements, but may hide data exceptions, performance issues, or potential logical flaws.

When operating MySQL databases in PHP, the mysqli extension provides rich functionality to handle database connections, queries, and error management. mysqli::get_warnings is a relatively in-depth but very practical function that helps developers get warning messages generated during database operations. In teaching, rational use of this function can not only improve students' understanding of database operation details, but also help them better troubleshoot potential problems.

When using MySQL databases in PHP, in addition to catching errors, you sometimes need to pay attention to the warning messages issued by the database. These warnings may indicate potential problems such as data truncation, field length exceeding limits, etc. The mysqli::get_warnings function can help us get these warning information for further processing.

When using PHP for MySQL database operations, you often encounter various warnings and errors. In order to ensure the robustness of the program, we need to uniformly capture and handle these exception information. This article will combine the mysqli::get_warnings() method and exception mechanism in the object-oriented mysqli extension of PHP to explain how to achieve unified error handling.

What is mysqli::get_warnings? mysqli::get_warnings is a method provided by the MySQLi extension of PHP to obtain warning information generated by recently executed SQL statements. It returns a chain of mysqli_warning objects, each containing a warning details such as error codes and warning messages.

In PHP development, especially in the face of high concurrency environments, the stability and performance of database operations are particularly important. The mysqli::get_warnings function is a method provided by the mysqli extension to obtain database warning information, which can help developers better debug and optimize SQL statements. However, in high concurrency scenarios, unreasonable use may lead to performance bottlenecks or data consistency problems. This article will explore how to use mysqli::get_warnings safely and efficiently in high concurrency environments.

The mysqli extension provides rich interfaces for operating MySQL databases, where the mysqli::get_warnings function is used to obtain warning information generated by the latest database operation. Although this function performs well in MySQL 5.6 and above, there are some differences in compatibility and performance in different versions of MySQL, and developers may encounter problems when using it. This article will introduce the compatibility issues of mysqli::get_warnings in detail and provide corresponding solutions.

1. Understand the role of mysqli::get_warnings mysqli::get_warnings Returns a chain of mysqli_warning objects, containing all warnings when executing SQL statements. Use this function to capture non-fatal problems such as data truncation, data type mismatch, index failure, etc., for easy subsequent processing.

What is mysqli::get_warnings? mysqli::get_warnings is a method of a MySQLi object that retrieves all warnings generated in a recent MySQL operation. Warnings usually do not cause query failures, but may contain important information, such as data truncation, implicit type conversion, etc., which are helpful for ensuring data accuracy and debugging.