How to implement data filtering after using pagehelper …

After paginating the data with PageHelper, you can utilize the following method for filtering the data.

Firstly, make sure that the PageHelper dependency has been added and configured accordingly.

In the method of querying data, use the PageHelper.startPage() method to enable pagination and pass in the current page number and the number of records to display per page.

3. Execute a query to retrieve the paginated data.

4. To filter and process the retrieved data, you can use Java 8’s Stream API for filtering, or utilize other filtering methods.

Return the filtered data.

The sample code is provided below:

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public List<User> getUsersByPageAndFilter(int pageNum, int pageSize, String keyword) {
        // 开启分页功能
        PageHelper.startPage(pageNum, pageSize);

        // 执行查询操作，获取分页后的数据
        List<User> userList = userMapper.getUsers();

        // 使用Java8的Stream流进行筛选
        List<User> filteredList = userList.stream()
                .filter(user -> user.getName().contains(keyword))
                .collect(Collectors.toList());

        // 返回筛选后的数据
        return filteredList;
    }
}

The getUsersByPageAndFilter() method in the above code takes a pageNum parameter to represent the current page number, a pageSize parameter to indicate the number of records displayed per page, and a keyword parameter for filtering purposes.

Initially, the PageHelper.startPage() method is called to enable pagination in the process. Next, the query operation is executed to fetch the paginated data. Subsequently, Java8’s Stream is used to filter the retrieved data based on the condition that the user name contains the keyword. Finally, the filtered data is returned.