修改代码中的错误package com.zxq; import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper; import com.zxq.domain.User; import org.junit.jupiter.api.Test; import org.springframework.boot.test.context.SpringBootTest; import java.util.HashMap; import java.util.List; import java.util.Map; @SpringBootTest class SpringbootMybatisplusZbApplicationTests { @Test void contextLoads() { } public void selectByName(){ Map<String,Object> columnMap=new HashMap<>(); columnMap.put("name","admin"); List<User> list=userMapper.selectByMap(columnMap) } @Test public void selectByProperty(){ QueryWrapper<User> queryWrapper=new QueryWrapper<>(); // queryWrapper.like("name","a"); queryWrapper.select("name","sex");//投影查询 List<User> list=uerMapper.selectList(queryWrapper); System.out.println(list); } }

在代码中，缺少了一个分号，导致出现了语法错误。在selectByName()方法中，将最后一行代码中的分号添加上即可，修改后的代码如下：

package com.zxq;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.zxq.domain.User;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@SpringBootTest
class SpringbootMybatisplusZbApplicationTests {

    @Test
    void contextLoads() {
    }

    public void selectByName(){
        Map<String,Object> columnMap=new HashMap<>();
        columnMap.put("name","admin");
        List<User> list=userMapper.selectByMap(columnMap);
    }

    @Test
    public void selectByProperty(){
        QueryWrapper<User> queryWrapper=new QueryWrapper<>();
        // queryWrapper.like("name","a");
        queryWrapper.select("name","sex");//投影查询
        List<User> list=userMapper.selectList(queryWrapper);
        System.out.println(list);
    }
}