resultMap標籤　　desc：使返回結果與vo類對應，可以用於接收物件集合與單個物件
<resultMap id="demoClass" type="cn.bohely.dolphin.domain.pack.DemoClass">
    <result property="id" column="ID"/>
    <result property="屬性" column="欄位"/>
</resultMap>

<select id="queryPackStockByCombIdAndStartEndDate" resultMap="demoClass"
 
>
　　select...
</select>

sql標籤　　　　desc：用與引入sql程式碼塊，一般用於展示所需要的欄位,體現複用性
<sql id="idName">id,name,age</sql>

呼叫：<include refid="idName"/>
if標籤與CONCAT使用　　　　desc：if用於動態植入sql條件或要更新的內容,CONCAT用於連線字串，否則非法->　%#{name}%　

<if test="property != null">content</if>

<if test="name !=null">
    and NAME like CONCAT
 
('%',#{name},'%')
</if>
set標籤使用　　desc：用於更新中，set標記會把最後一個逗號給去掉。

<set>
    UPDATE_TIME = now(),
    <if test="status != null">STATUS = #{status,jdbcType=VARCHAR},</if>
</set>
foreach標籤使用　　　　　　desc:用於動態植入多個值（集合）到sql語句中，常用在巢狀查詢in後

<resultMap id="combStrategyMap" type="cn.bohely.dolphin.domain.pack.PackCombStrategy">
    <result property="combId" column="COMB_ID"/>
    <result property="strategyId" column="STRATEGY_ID"/>
    <association
 
 property="strategy" column="STRATEGY_ID" select="getStrategyById" />
</resultMap>

<select id="queryCombStrategyByCombId" resultMap="combStrategyMap">
    select
      COMB_ID,
      STRATEGY_ID
    from D_PACK_COMB_STRATEGY
    where COMB_ID in
    <foreach collection="list" index="index" item="item" open="(" separator="," close=")">
        #{item}
    </foreach>
</select>

<select id="getStrategyById" resultMap="strategyMap">
    select * from D_STRATEGY where ID = #{strategyId} and STATUS = 'ON'
</select>

parameterType屬性　　　desc：用於指明傳入的物件引數

<update id="updateStraStatus" parameterType="cn.bohely.dolphin.domain.strategy.Strategy">
    UPDATE D_STRATEGY
    <set>
        UPDATE_TIME = now(),
        <if test="status != null">STATUS = #{status,jdbcType=VARCHAR},</if>
    </set>
    WHERE ID = #{id}
</update>

注意：一般新增和更新指明引數型別

STATUS = #{status,jdbcType=VARCHAR}