1.根据id删除

package com.mp.delete;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.mp.dao.UserMapper;
import com.mp.entity.User;
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.SpringRunner;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @Description  测试，删除方法
 * @Author LL
 * @Date 2020-03-24 22:53
 */
@SpringBootTest
@RunWith(SpringRunner.class)
public class DeleteTest {

    @Autowired
    private UserMapper userMapper;

    /**
     * 根据id删除
     */
    @Test
    public void deleteById(){
        int rows = userMapper.deleteById(1241614720021913633L);
        System.out.println("删除条数："+rows);
    }

    /**
     * 根据多个id删除
     */
    @Test
    public void deleteBatchIds(){
        List<Long> ids = Arrays.asList(1241614720021913633L,1241614720021913667L);
        int rows = userMapper.deleteBatchIds(ids);
        System.out.println("删除条数："+rows);
    }
}

2.其它删除方法

package com.mp.delete;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.mp.dao.UserMapper;
import com.mp.entity.User;
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.SpringRunner;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @Description  测试，删除方法
 * @Author LL
 * @Date 2020-03-24 22:53
 */
@SpringBootTest
@RunWith(SpringRunner.class)
public class DeleteTest {

    @Autowired
    private UserMapper userMapper;

    /**
     * 根据map中的参数作为条件删除
     */
    @Test
    public void deleteByMap(){
        Map<String, Object> deleteMap = new HashMap<>();
        deleteMap.put("name", "张1");
        deleteMap.put("age", 33);
        int rows = userMapper.deleteByMap(deleteMap);
        System.out.println("删除条数："+rows);
    }
}

3.以条件构造器为参数的删除方法

package com.mp.delete;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.mp.dao.UserMapper;
import com.mp.entity.User;
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.SpringRunner;

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

/**
 * @Description  测试，删除方法
 * @Author LL
 * @Date 2020-03-24 22:53
 */
@SpringBootTest
@RunWith(SpringRunner.class)
public class DeleteTest {

    @Autowired
    private UserMapper userMapper;


    /**
     * 条件构造器为参数的删除方法
     */
    @Test
    public void deleteWrapper(){
        LambdaQueryWrapper<User> lambdaQuery = Wrappers.lambdaQuery();
        lambdaQuery.eq(User::getAge, 38).or().gt(User::getAge, 45);
        int rows = userMapper.delete(lambdaQuery);
        System.out.println("影响行数："+rows);
    }

}