querywrapper条件构造器

本文主要是介绍querywrapper条件构造器，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

package com.kuang;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.core.toolkit.support.SFunction;
import com.kuang.mapper.UserMapper;
import com.kuang.pojo.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import static org.assertj.core.api.Assertions.assertThat;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static org.hamcrest.MatcherAssert.assertThat;


@SpringBootTest
class MybitisPlusApplicationTests {

    @Autowired
    private UserMapper userMapper;

    @Test
    void contextLoads() {
        List<User> users = userMapper.selectList(null);
        users.forEach(System.out::println);
    }

    @Test
    public void testInsert(){
        User user = new User();
        user.setName("sdfsdf");
        user.setAge(3);
        user.setEmail("313@qq.com");
        int insert = userMapper.insert(user);
        System.out.println(insert);
        System.out.println(user);
    }

    @Test
    public void test1OptimisticLocker() {
        User user = userMapper.selectById(5L);
        user.setName("sdfsd11f");
        user.setEmail("sdfsdf@qqq");
        userMapper.updateById(user);

    }

    @Test
    public void testSelectById() {
        User user = userMapper.selectById(1L);
       System.out.println(user);
    }

    @Test
    public void testSelect2() {
        String aa = "2021-08-03 01:00:08";
        String aa2 = "2021-09-03 01:00:08";
        QueryWrapper<User> betweenWrapper = new QueryWrapper<>();
        betweenWrapper.between("create_time", aa, aa2);

//        SFunction<User, ?> age;
        List<User> list = userMapper.selectList(betweenWrapper);
//                .lt(User::getCreateTime, "2021-08-30 01:00:08"));
        list.forEach(System.out::println);


//        User user1 = new User();
////        user1.setId(2L);
//        user1.setName("44444");
//        userMapper.update(user1,new QueryWrapper<User>()
//                .lambda().lt(User::getCreateTime, "2021-08-30 01:00:08"));

//        User user = userMapper.selectById(1L);
//       System.out.println(user);
    }

    @Test
    public void testUpdate2() {
        User user1 = new User();
//        user1.setId(2L);
        user1.setName("44444");
        userMapper.update(user1,new QueryWrapper<User>()
                .lambda().lt(User::getCreateTime, "2021-08-30 01:00:08"));

//        User user = userMapper.selectById(1L);
//       System.out.println(user);
    }

    @Test
    public void testSelectByBatchId() {
        List<User> list = userMapper.selectBatchIds(Arrays.asList(1, 2, 3, 4));
        System.out.println(list);
    }


    @Test
    public void testUpdate() {
        User user = new User();
        user.setId(7L);
        user.setName("关注狂人说公众号11");
        user.setAge(21);
        userMapper.updateById(user);
        List<User> list = userMapper.selectList(null);
        list.forEach(System.out::println);
    }


    void contextLoads2() {
//        for(int i=0; i<10; i++){
//            User user = new User();
//            user.setAge(11);
//            user.setEmail("qq@qq.com");
//            user.setName("jame"+i);
//            userMapper.insert(user);
//        }
//        User user = new User();

//        user.setId(8L);
//        user.setId(3L);
//        user.setAge(222);
//        user.setEmail("qq@qq.com");
//        user.setName("jame");
//        userMapper.insert(user);
//        User user = new User();
//        List<User> list = new ArrayList<>();
//        list.add(user );
//        assertThat(userMapper.deleteById(4L));
//        userMapper.delete(new QueryWrapper<User>()
//                .lambda().eq(User::getName, "jame2")
//        );
//        userMapper.updateById(new User().setId(2L));
//        assertThat(mapper.updateById(new User().setId(1L).setEmail("ab@c.c"))).isGreaterThan(0);
//        mapper.update(user,null);
//        mapper.update(
//                new User().setName("mp"),
//                Wrappers.<User>lambdaUpdate()
//                        .set(User::getAge, 3)
//                        .eq(User::getId, 2)
//        );
//        User user = mapper.selectById(7);
//        mapper.update(null, Wrappers.<User>lambdaUpdate().set(User::getName, "aaa").eq(User::getId, 8));
//        System.out.println(user);
//        assertThat(mapper.selectById(8).getEmail()).isEqualTo("qq@qq.com");
//        mapper.update(
//                new User().setEmail("miemie2@baomidou.com"),
//                Wrappers.<User>lambdaUpdate()
//                        .set(User::getAge, null)
//                        .eq(User::getId, 2)
//        );
//        System.out.println(i);
//        List<User> users = mapper.selectList(null );
//        users.forEach(System.out::println);
//        System.out.println(users);

    }

}

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