Mybatis

1. dao参数:(HotelInfoModel model)
   mapper:
   parameterType="HotelInfoModel"
   #{hotelName}, #{city},#{price},#{levelEnum}

2. dao, 参数:(@Param("model") HotelInfoModel model)
   mapper:
   parameterType: 无
   #{model.hotelName}, #{model.city},#{model.price},#{model.levelEnum}

3. dao参数 (Map<String, Object> params)
   假设params中存放了key:“id"和“price"
   parameterType="map"
   #{price},#{id}

4. dao参数 (@Param("map") Map<String, Ojbect> params)
   parameterType:无
   #{map.id}, #{map.price}

5. dao参数(Map<String, Object> params)
   注:param中存放了key:“model"和"city"
   parameterType="map"
   #{model.price},#{model.id}, #{city}

6. dao参数 (@Param("map") Map<String, Ojbect> params)
   parameterType:无
   #{map.model.id}, #{map.model.price}, #{map.city}

7. dao参数 (List<Integer> ids)
   parameterType="java.util.List"
   <foreach collection="list" item="item" separator=",">
   #{item}

8. dao参数(@Param("ids")List<Integer> ids)
   parameterType:无
   <foreach collection="ids" item="item" separator=",">
   #{item}

9. dao参数(List<HotelInfoModels> models)
   parameterType="java.util.List"
   <foreach collection="list" item="item" separator=",">
   #{item.price}, #{item.hotelName}

10. dao参数(@Param("hotelInfoModelList")List<HotelInfoModels>
    models)
    parameterType:无
    <foreach collection="hotelInfoModelList" item="item" separator=",">
    #{item.price}, #{item.hotelName}

11. dao参数(@Param("hotleName") String hotelName,
    @Param("id") Integer id )
    parameterType:无
    #{hotelName} , #{id}

动态SQL

<if test="city != null and city !=''">
and city = #{city}
</if>
<if test="hotelName != null and hotelName !=''">
and hotel_name = #{hotelName}
</if>

<where>
<if test="city != null and city !=''">
and city = #{city}
</if>
<if test="hotelName != null and hotelName !=''">
and hotel_name = #{hotelName}
</if>
</where>

<set>
<if test="price != null and price > 0">
price = #{price},
</if>
<if test="levelEnum != null">
level = #{levelEnum},
</if>
</set>

<foreach collection="levelList" item="level" close=")"
open="(" separator=",">
#{level}
</foreach>

<choose>
<when test="hotelName != null and hotelName !=''">
where hotel_name = #{hotelName}
</when>
<when test="city != null and city !=''">
where city = #{city}
</when>
<otherwise>
</otherwise>
</choose>