3.3、删除操作
3.3.1、deleteById
方法定义：
代码语言：javascript复制/**
* 根据 ID 删除
*
* @param id 主键ID
*/
int deleteById(Serializable id);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;
@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {
@Autowired
private UserMapper userMapper;
@Test
public void testDeleteById() {
//执行删除操作
int result = this.userMapper.deleteById(6L);
System.out.println("result = " result);
}
}结果：
代码语言：javascript复制[main] [cn.itcast.mp.mapper.UserMapper.deleteById]-[DEBUG] ==> Preparing: DELETE FROM
tb_user WHERE id=?
[main] [cn.itcast.mp.mapper.UserMapper.deleteById]-[DEBUG] ==> Parameters: 6(Long)
[main] [cn.itcast.mp.mapper.UserMapper.deleteById]-[DEBUG] <== Updates: 1
数据被删除。
3.3.2、deleteByMap
方法定义：
代码语言：javascript复制/**
* 根据 columnMap 条件，删除记录
*
* @param columnMap 表字段 map 对象
*/
int deleteByMap(@Param(Constants.COLUMN_MAP) Map<String, Object> columnMap);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() {
Map<String, Object> columnMap = new HashMap<>();
columnMap.put("age",20);
columnMap.put("name","张三");
//将columnMap中的元素设置为删除的条件，多个之间为and关系
int result = this.userMapper.deleteByMap(columnMap);
System.out.println("result = " result);
}
}结果：
代码语言：javascript复制[main] [cn.itcast.mp.mapper.UserMapper.deleteByMap]-[DEBUG] ==> Preparing: DELETE FROM
tb_user WHERE name = ? AND age = ?
[main] [cn.itcast.mp.mapper.UserMapper.deleteByMap]-[DEBUG] ==> Parameters: 张三
(String), 20(Integer)
[main] [cn.itcast.mp.mapper.UserMapper.deleteByMap]-[DEBUG] <== Updates: 0
