MyBatis中的查询语句
<!-- 取一个 -->
<select id="query" parameterType="map" resultType="map"> select menu_id, menu_name, parent_id, order_num from sys_menu where menu_id=#{menuId} </select>
<!-- 取全部 -->
<select id="queryList" parameterType="map" resultType="map"> select menu_id, menu_name, parent_id, order_num from sys_menu </select>
Mapper中映射的方法
//取一个 Map<String,Object> query(Map<String,Object> paramMap); //取全部 List<Map<String,Object>> queryList(Map<String,Object> paramMap);
Controller测试
@RestController @RequestMapping("/") public class TestController { @Autowired private SysMenuMapper sysMenuMapper; @RequestMapping("test") public Object httpTest(Long menuId){ Map<String, Object> paramMap = new HashMap<>(); if(StringUtils.isEmpty(menuId)){ List<Map<String, Object>> maps = sysMenuMapper.queryList(paramMap);//取全部 return maps; }else{ paramMap.put("menuId",menuId); Map<String, Object> query = sysMenuMapper.query(paramMap);//取一个 return query; } } }
取全部返回值：http://localhost:8080/test
取一个返回值:http://localhost:8080/test?menuId=100
//一个查询返回 就是一个Map，查询出来的结果 就是一个个键值对，键：属性名，值：查询的数据
Map<String, Object> paramMap = new HashMap<>(); paramMap.put("parent_id","1"); paramMap.put("menu_name","用户管理"); paramMap.put("order_num","1"); paramMap.put("menu_id","100");