Mybatis-Plus实践学习（十）

3.3.3、delete

方法定义：

代码语言：javascript复制

/**
* 根据 entity 条件，删除记录
*
* @param wrapper 实体对象封装操作类（可以为 null）
*/
int delete(@Param(Constants.WRAPPER) Wrapper<T> wrapper);

测试用例：

代码语言：javascript复制

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.HashMap;
import java.util.Map;
@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {
@Autowired
private UserMapper userMapper;
@Test
public void testDeleteByMap() {
User user = new User();
user.setAge(20);
user.setName("张三");
//将实体对象进行包装，包装为操作条件
QueryWrapper<User> wrapper = new QueryWrapper<>(user);
int result = this.userMapper.delete(wrapper);
System.out.println("result = "   result);
}
}

结果：

代码语言：javascript复制

[main] [cn.itcast.mp.mapper.UserMapper.delete]-[DEBUG] ==> Preparing: DELETE FROM
tb_user WHERE name=? AND age=?
[main] [cn.itcast.mp.mapper.UserMapper.delete]-[DEBUG] ==> Parameters: 张三(String),
20(Integer)
[main] [cn.itcast.mp.mapper.UserMapper.delete]-[DEBUG] <== Updates: 0

3.3.4、deleteBatchIds

方法定义：

代码语言：javascript复制

/**
* 删除（根据ID 批量删除）
*
* @param idList 主键ID列表(不能为 null 以及 empty)
*/
int deleteBatchIds(@Param(Constants.COLLECTION) Collection<? extends Serializable>
idList);

测试用例：

代码语言：javascript复制

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;
@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {
@Autowired
private UserMapper userMapper;
@Test
public void testDeleteByMap() {
//根据id集合批量删除
int result = this.userMapper.deleteBatchIds(Arrays.asList(1L,10L,20L));
System.out.println("result = "   result);
}
}

结果：

代码语言：javascript复制

[main] [cn.itcast.mp.mapper.UserMapper.deleteBatchIds]-[DEBUG] ==> Preparing: DELETE
FROM tb_user WHERE id IN ( ? , ? , ? )
[main] [cn.itcast.mp.mapper.UserMapper.deleteBatchIds]-[DEBUG] ==> Parameters: 1(Long),
10(Long), 20(Long)
[main] [cn.itcast.mp.mapper.UserMapper.deleteBatchIds]-[DEBUG] <== Updates: 1

mybatis import 对象 集合 实践

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