在MyBatis中进行分页查询的两种方法详解

public interface UserMapper {
    List<User> selectUsersByPage(@Param("offset") int offset, @Param("limit") int limit);
}

<mapper namespace="com.example.UserMapper">
    <select id="selectUsersByPage" resultType="com.example.User">
        SELECT * FROM users
        LIMIT #{limit} OFFSET #{offset}
    </select>
</mapper>

int currentPage = 1; // 当前页
int pageSize = 10;   // 每页的条数
int offset = (currentPage - 1) * pageSize;

List<User> users = userMapper.selectUsersByPage(offset, pageSize);

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>5.2.0</version> <!-- 确保使用最新版本 -->
</dependency>

<plugins>
    <plugin interceptor="com.github.pagehelper.PageInterceptor">
        <property name="helperDialect" value="mysql"/> <!-- 针对 MySQL -->
        <property name="reasonable" value="true"/>
        <property name="supportMethodsArguments" value="true"/>
    </plugin>
</plugins>

public interface UserMapper {
    List<User> selectAllUsers();
}

import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;

int currentPage = 1;  // 当前页
int pageSize = 10;    // 每页记录数

// 启动分页
PageHelper.startPage(currentPage, pageSize);

// 执行查询
List<User> users = userMapper.selectAllUsers();

// 获取分页信息
PageInfo<User> pageInfo = new PageInfo<>(users);
System.out.println("Total pages: " + pageInfo.getPages());
System.out.println("Total records: " + pageInfo.getTotal());