How to solve the issue of MyBatis PageHelper not workin…

If you are using the MyBatis PageHelper plugin and the pagination query is not working, you can troubleshoot and resolve the issue by following these steps:

1. The file pom.xml.

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>版本号</version>
</dependency>

1. The configuration file for MyBatis, named mybatis-config.xml.

<plugins>
    <plugin interceptor="com.github.pagehelper.PageInterceptor">
        <property name="dialect" value="数据库类型"/>
        <!-- 其他配置项 -->
    </plugin>
</plugins>

The configuration option for dialect needs to be configured according to the type of database being used, for example, “mysql” for MySQL.

1. Make sure that you are correctly calling the PageHelper.startPage() method when performing paginated queries. This method should be called before the query statement in order to enable pagination.

PageHelper.startPage(pageNum, pageSize);
List<User> userList = userDao.selectUsers();

pageNum and pageSize respectively refer to the current page number and the number of records to be displayed per page.

1. Confirm if appropriate query conditions are used in the query statement. If the query conditions are not appropriate, it could result in the PageHelper plugin being unable to correctly parse the pagination parameters, therefore rendering it ineffective.
2. Ensure that the appropriate sorting method is used in the query statement. Using an incorrect sorting method may result in incorrect pagination results. You can set the sorting method by calling the PageHelper.orderBy() method, for example:

PageHelper.orderBy("create_time desc");

If the above steps do not solve the problem, you can try checking the console or log output for any relevant error or exception messages to further troubleshoot the issue.