mybatisplus list

MyBatis-Plus 是 MyBatis 的增强工具，在 MyBatis 的基础上进行了扩展和增强，提供了许多实用的功能，如分页、自动填充、性能分析等。其中，list 方法是 MyBatis-Plus 提供的一个查询方法，用于查询符合条件的所有记录。

使用 list 方法需要先创建一个 QueryWrapper 对象，然后调用 list 方法即可。例如，查询 user 表中 age 大于 18 的所有记录，可以使用以下代码：

QueryWrapper<User> wrapper = new QueryWrapper<>();
wrapper.gt("age", 18);
List<User> userList = userMapper.selectList(wrapper);

相关问题

mybatisplus list查询

您好！对于 MyBatis Plus，您可以使用 LambdaQueryWrapper 类来构建查询条件，包括查询条件为 List 的情况。

以下是一个示例代码，展示如何使用 MyBatis Plus 进行查询条件为 List 的操作：

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;

import java.util.List;

public class MyBatisPlusExample {
    public List<User> getUsersByNames(List<String> names) {
        if (CollectionUtils.isEmpty(names)) {
            return null;
        }

        LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(User::getName, names);

mybatisplus list分页查询

MyBatis Plus provides a convenient way to perform pagination queries using the `Page` class. Here is an example of how to perform a list pagination query with MyBatis Plus:

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {

    @Autowired
    private UserMapper userMapper;

    public IPage<User> getUsersWithPagination(int pageNo, int pageSize) {
        Page<User> page = new Page<>(pageNo, pageSize);
        return userMapper.selectPage(page, null);
    }
}

In this example, `User` is the entity class mapped to the database table, and `UserMapper` is the MyBatis Plus mapper interface for `User`. The `getUsersWithPagination` method takes the page number (`pageNo`) and page size (`pageSize`) as parameters.

By creating a new `Page` object and passing it to the `selectPage` method of the mapper, MyBatis Plus will handle the pagination query automatically. The result is returned as an `IPage` object, which contains the paginated data along with other useful information such as total records and current page number.

You can then use the `IPage` object to retrieve the paginated data and display it as needed.