租房子的例题后端写法

如下图的目录结构:

HouseMapper.xml

 <resultMap id="BaseResultMap" type="com.hanqi.model.House">
    <id column="ID" jdbcType="DECIMAL" property="id" />
    <result column="KEYWORD" jdbcType="VARCHAR" property="keyword" />
    <result column="AREA" jdbcType="VARCHAR" property="area" />
    <result column="SQUAREMETER" jdbcType="DECIMAL" property="squaremeter" />
    <result column="RENT" jdbcType="DECIMAL" property="rent" />
    <result column="RENTTYPE" jdbcType="VARCHAR" property="renttype" />
    <result column="HOUSETYPE" jdbcType="VARCHAR" property="housetype" />
  </resultMap>
  <sql id="Base_Column_List">
    ID, KEYWORD, AREA, SQUAREMETER, RENT, RENTTYPE, HOUSETYPE
  </sql>
  
  
<!--   根据id查数据 -->
  <select id="selectByPrimaryKey"  resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from HAHA.HOUSE
    where ID = #{id}
  </select>
    
   <!--  查询所有数据 -->
  <select id="selectAll" resultMap="BaseResultMap">
        select
       <include refid="Base_Column_List" />
       from HAHA.HOUSE 
  </select>
  
 <!--  根据复选框选择的内容进行查询 -->
  <select id="selectByCheck" resultMap="BaseResultMap" parameterType="Map">
        select 
       <include refid="Base_Column_List" />
       from house h
       <where>
			<if test="p1 != null">
				and h.area in 
				<foreach collection="p1" item="a" close=")" open="(" separator=",">
					#{a}
				</foreach>
			</if>
			<if test="p2 != null">
				and h.renttype in 
				<foreach collection="p2" item="r" close=")" open="(" separator=",">
					#{r}
				</foreach>
			</if>
			<if test="p3 != null">
				and h.housetype in 
				<foreach collection="p3" item="h" close=")" open="(" separator=",">
					#{h}
				</foreach>
			</if>
			<if test="p4 != null">
				and h.keyword like '%'||#{p4}||'%'
			</if>
		</where>
  
  </select>
  
 <!--  删除数据 -->
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
    delete from HAHA.HOUSE
    where ID = #{id,jdbcType=DECIMAL}
  </delete>
  
  <!-- 插入数据 -->
  <insert id="insert" parameterType="com.hanqi.model.House"> 
    insert into HAHA.HOUSE (ID, KEYWORD, AREA, 
      SQUAREMETER, RENT, RENTTYPE, 
      HOUSETYPE)
    values (sq_test.nextval, #{keyword,jdbcType=VARCHAR}, #{area,jdbcType=VARCHAR}, 
      #{squaremeter,jdbcType=DECIMAL}, #{rent,jdbcType=DECIMAL}, #{renttype,jdbcType=VARCHAR}, 
      #{housetype,jdbcType=VARCHAR})
  </insert>

<update id="updateByPrimaryKeySelective" parameterType="com.hanqi.model.House"> <!-- 更新数据 -->
    update HAHA.HOUSE
    <set>
      <if test="keyword != null">
        KEYWORD = #{keyword,jdbcType=VARCHAR},
      </if>
      <if test="area != null">
        AREA = #{area,jdbcType=VARCHAR},
      </if>
      <if test="squaremeter != null">
        SQUAREMETER = #{squaremeter,jdbcType=DECIMAL},
      </if>
      <if test="rent != null">
        RENT = #{rent,jdbcType=DECIMAL},
      </if>
      <if test="renttype != null">
        RENTTYPE = #{renttype,jdbcType=VARCHAR},
      </if>
      <if test="housetype != null">
        HOUSETYPE = #{housetype,jdbcType=VARCHAR},
      </if>
    </set>
    where ID = #{id,jdbcType=DECIMAL}
    <!-- where ID = #{id} -->
  </update>

HouseMapper.java

public interface HouseMapper {
    int deleteByPrimaryKey(Integer id);//删除数据

    int insert(House record);   //用来插入数据的

    int insertSelective(House record); 
    
    List<House> selectAll();  //查询全部数据的

    House selectByPrimaryKey(Integer id);  //根据id查询信息
    
    List<House> selectByCheck(Map<String, Object> map); //根据复选框选择的内容进行查询

    int updateByPrimaryKeySelective(House record); //更新数据

    int updateByPrimaryKey(House record);
}

HouserService.java

public interface HouseService {
	  public int insertHouse(House house);  //插入数据
	  public List<House> selectAll();  //查询所有数据
	  public House selectByID(Integer id);  //根据id查数据
	  public int updateHouse(House house); //更新数据
	  public int deleteHouse(Integer id); //删除数据
	  public List<House> selectByCheck(Map<String, Object> map);  //根据复选框选择查询信息
}

HouserServiceImpl.java

@Repository
public class HouseServiceImpl implements HouseService {
   @Autowired
	private HouseMapper houseMapper;
	@Override
	public int insertHouse(House house) {  //插入数据
		int h = houseMapper.insert(house);
		 return h;
	}
	@Override
	public List<House> selectAll() {  //查询全部信息
		List<House> list = houseMapper.selectAll();
		return list;
	}
	@Override
	public House selectByID(Integer id) {  //根据id进行信息的查询
		House h2 = houseMapper.selectByPrimaryKey(id);
		return h2;
	}
	@Override
	public int updateHouse(House house) {  //数据更新
		int h3 = houseMapper.updateByPrimaryKeySelective(house);
		return h3;
	}
	@Override
	public int deleteHouse(Integer id) { //删除数据
		int h4 = houseMapper.deleteByPrimaryKey(id);
		return h4;
	}
	@Override
	public List<House> selectByCheck(Map<String, Object> map) {  //根据复选框选择的内容进行查询
		List<House> list2 = houseMapper.selectByCheck(map);
		return list2;
	}

}

HouseController.java

@Controller
@RequestMapping("/house2")
public class HouseController {
		@Autowired
       private HouseService  houseService;
		
		@RequestMapping("/toXin")
		public String toInsert() {   //在搜索页面上点击添加新数据跳到insert.jsp页面上
			
			return "insert";
			
		}
       
       @RequestMapping("/insert")
       public String insertHouse(House house,Model md) {  //插入数据
    	   int h = houseService.insertHouse(house);
    	   if (h > 0) {
    		   md.addAttribute("msg", "插入成功!");
		}else {
			  md.addAttribute("msg", "插入失败!");
		}
		return "success";
    	   
     }
       
       @RequestMapping("/select")
       public ModelAndView selectAll(ModelAndView mav){  //查询全部数据
    	   List<House> list = houseService.selectAll();
    	   if(list.size() > 0){
    		    mav.addObject("infolist", list);
    		   // mav.setViewName("forward:/manage.jsp");  //不走视图解析器了,直接来配置一下地址
    		    mav.setViewName("manage");
    	   }else {
    		    mav.setViewName("fail");
    	   }
    	   	return mav;
       }
       
       @RequestMapping("/selectbyid")
       public ModelAndView selectByID(ModelAndView mav,Integer id) {  //根据id查询信息
    	  House h =  houseService.selectByID(id);
    	   mav.addObject("list", h);
    	   mav.setViewName("update");
    	   return mav;
       }
       
       
       @RequestMapping("/update")
       public String updateinfo(Model md,House house) {  //更新数据
    	   int h2 = houseService.updateHouse(house);
    	   System.out.println(h2);
    	   if (h2 > 0) {
    		   md.addAttribute("msg", "更新成功!");
			  //mav.setViewName("redirect:/house2/select.do"); //重定向,目的是为了能够进行更新操作后,再次发送请求,看一下自己更新的结果
		}else {
			  md.addAttribute("msg", "更新失败!");
		}
		return "success";
       }
       
       @RequestMapping("/delete")
       public String deleteHouse(Model md,Integer id) {  //删除信息
    	   int h3 = houseService.deleteHouse(id);
    	   if (h3 > 0) {
			   md.addAttribute("msg","删除成功!");
		}else {
			md.addAttribute("msg","删除失败!");
		}
		return "success";
       }
       //根据复选框里面选择的选项进行信息的查询
       @RequestMapping("/selectByCheck")
       public String selectByCheck( String[] area,
    		   String[] ht, String[] rt,String keyword,
    		   Model md) {
    	      Map<String,Object> map =  MapUtil.mp(area,ht,rt,keyword);
    	     
    	      List<House> list2 = houseService.selectByCheck(map);
    	      md.addAttribute("houselist",list2);
    	   return "forward:/seareach.jsp" ;
       }
       
}

在com.hanqi.util 包下面的MapUtil.java

public class MapUtil {  //往map集合里面添加对象,直接在控制层里面进行调用
	public static Map<String, Object> mp(Object... objs) {  //静态的方法,直接调用
		Map<String, Object> map = new HashMap<String, Object>();
		int i = 1;
		for(Object o : objs) {
			map.put("p" + i, o);
			i++;
		}
		return map;
	}
}