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attr_get performance in different MySQL versions

M66 2025-06-02

mysqli_stmt::attr_get is a method in PHP to get the attribute value of a preprocessing statement ( mysqli_stmt object). It is very helpful for debugging and dynamically adjusting SQL statement behavior in database programming, but due to the difference between the MySQL version and the PHP extension version, there are some differences in the performance of this function, so special attention should be paid to it when using it.

1. Function introduction

mysqli_stmt::attr_get is used to obtain the value of the specified attribute. The syntax is as follows:

 $value = $stmt->attr_get($attr);

where $stmt is a prepared mysqli_stmt object, and $attr is the attribute constant you want to query, such as:

  • MYSQLI_STMT_ATTR_UPDATE_MAX_LENGTH

  • MYSQLI_STMT_ATTR_CURSOR_TYPE

  • MYSQLI_STMT_ATTR_PREFETCH_ROWS

This function returns the current value of the property.

2. Performance differences between MySQL versions

  1. MySQL 5.1 and below <br> This function supports limited attributes, and some attribute return values ​​are unstable, and even false will be returned. For example, MYSQLI_STMT_ATTR_PREFETCH_ROWS may not work in lower versions.

  2. MySQL version 5.5 - 5.7 <br> The function supports more properties and returns more accurate results, but there are still compatibility issues when using cursor-related properties ( MYSQLI_STMT_ATTR_CURSOR_TYPE ) and in some cases the cursor does not work as expected.

  3. MySQL 8.0 and above <br> Function performance is the most stable, supporting most properties, and combined with improvements in MySQL native support, the behavior of cursor type and prefetched row count attributes is more controllable and consistent.

3. Precautions for use

  • Ensure that the PHP version is compatible with the MySQL driver <br> The support for attr_get by mysqli extension in different PHP versions will also be different. It is recommended to use PHP 7.4 and above to ensure optimal compatibility.

  • Attribute value checks must be rigorous <br> Since different versions may return different types of results, it is recommended to perform type and validity detection of the return value before use to avoid misuse and cause program exceptions.

  • Avoid calling on unsupported properties <br> Calling an unsupported attribute will return false . Please design the logic reasonably based on the support of mysqli_stmt::attr_set .

  • Debugging and logging <br> In complex applications, logs should be recorded when using attr_get to obtain attributes to facilitate checking behavioral differences in different environments.

4. Sample code

Here is a simple demonstration of how to use mysqli_stmt::attr_get and replace the URL domain name m66.net :

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