1. 实战删除

package com.gblfy.springboot.mybatisplus.mapper;import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.conditions.update.LambdaUpdateChainWrapper;
import com.gblfy.springboot.mybatisplus.entity.User;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
@Slf4j
public class UserDelTest {@Autowiredprivate UserMapper userMapper;/*** 根据 ID 删除*/@Testpublic void delById() {int rows = userMapper.deleteById(1094592041087729666L);log.info("删除条数: {}", rows);}/*** 根据 columnMap 条件，删除记录*/@Testpublic void delByMap() {Map<String, Object> columnMap = new HashMap<>();columnMap.put("name", "向后");columnMap.put("age", 25);int rows = userMapper.deleteByMap(columnMap);log.info("删除条数: {}", rows);}/*** 删除（根据ID 批量删除）* <p>* 主键ID列表(不能为 null 以及 empty)*/@Testpublic void deleteBatchIds() {int rows = userMapper.deleteBatchIds(Arrays.asList(109459204108772966L, 1088250446457389058L, 1088250446457389059L));log.info("删除条数: {}", rows);}@Testpublic void deleteByWrapper() {LambdaQueryWrapper<User> lambdaQuery = Wrappers.<User>lambdaQuery();lambdaQuery.eq(User::getAge, 27).gt(User::getAge, 41);int rows = userMapper.delete(lambdaQuery);log.info("删除条数: {}", rows);}
}