for(User user4:list){ System.out.println(user4.toString()); } session.commit(); //这句话要加上 1. 2. 3. 4. 5. 6. 上面代码简单介绍: 1)查询集合的api方法是:selectList(String); 2)跟查询一条数据一样,简单查询需要表中字段和实体类中属性名一一对应,复杂查询在后面会介绍到。
select * from user where id = #{id} and account = #{account} </select> 1. 2. 3. Map<String, Object> map = new HashMap<String, Object>(); map.put("id", 1); map.put("account", "dva"); List<Map<String, Object>> listMap = sqlSession.selectList("self.exercise.dao.UserDao....
SELECT*FROMuser_infoWHEREtom_age='20'andname='tom'; 等同于 QueryWrapper<UserInfo> queryWrapper =newQueryWrapper(); queryWrapper.eq("tom_age", '20');//tom_age必须是数据库中的字段queryWrapper.eq("name",'tom'); List<UserInfo> list = userInfoMapper.selectList(queryWrapper );...
getString(s); return Arrays.asList(StringUtils.tokenizeToStringArray(value, DELIM)); } @Override public List<String> getNullableResult(ResultSet resultSet, int i) throws SQLException { String value = resultSet.getString(i); return Arrays.asList(StringUtils.tokenizeToStringArray(value, DELIM)); ...
String name="字母";//name不为空String email="";//email为空串QueryWrapper<User>query=newQueryWrapper<>();query.like(StringUtils.isNotEmpty(name),"name",name)//因为email为空串,该条件未生效.like(StringUtils.isNotEmpty(email),"email",email);List<User>list=userMapper.selectList(query);list.fo...
DeleteByIds()) .add(new UpdateById()) .add(new SelectById()) .add(new SelectBatchByIds()); } else { logger.warn(String.format("%s ,Not found @TableId annotation, Cannot use Mybatis-Plus 'xxById' Method.", tableInfo.getEntityType())); } return builder.build().collect(toList())...
String name = "张三";LambdaQueryWrapper<User> lqw = new LambdaQueryWrapper<User>();lqw.eq(User::getName, name);List<User> userList = userMapper.selectList(lqw); // 当name为空字符串或null时,最后生成的sql会变成SELECT * FROM user WHERE name = '';SELECT * FROM user WHERE name = null...
){List<User>userList=userDao.selectList(null);System.out.println(userList);}} ...
String email = ""; //email为空串 QueryWrapper<User> query = new QueryWrapper<>(); query.like(StringUtils.isNotEmpty(name), "name", name) //因为email为空串,该条件未生效 .like(StringUtils.isNotEmpty(email), "email", email); List<User> list = userMapper.selectList(query); ...