How to perform pagination on multiple tables with MyBatis Plus?

MyBatis Plus offers a Page object for implementing pagination queries. When conducting a multi-table join, the Wrapper class can be used to construct complex search conditions.

Here is a sample code demonstrating how to use MyBatis Plus for performing a multi-table join and pagination.

// 构建分页对象
IPage<User> page = new Page<>(currentPage, pageSize);

// 构建查询条件
QueryWrapper<User> queryWrapper = new QueryWrapper<>();
queryWrapper.eq("status", 1) // 条件1：状态为1
    .like("username", "test") // 条件2：用户名包含"test"
    .between("create_time", startTime, endTime); // 条件3：创建时间范围

// 执行多表联查，并使用分页对象进行分页查询
IPage<User> userPage = userMapper.selectPage(page, queryWrapper);

List<User> userList = userPage.getRecords(); // 获取查询结果列表
long total = userPage.getTotal(); // 获取总记录数

// 处理查询结果
// ...

In the example above, currentPage represents the current page number, pageSize represents the number of records displayed per page. User is the entity class and UserMapper is the corresponding Mapper interface.

First, a Page object is constructed, specifying the current page number and the number of records to display per page. Then, complex querying conditions are built using QueryWrapper, including equal to, fuzzy matching, and interval queries. Finally, the selectPage method is called to execute a multi-table join and paginated query, returning an IPage object. The query result list can be obtained through getRecords, and the total number of records can be obtained through getTotal.

The logic for adjusting query conditions and handling query results needs to be based on actual circumstances.