mybatis中mapper接口的参数设置几种方法

方法一：忽略parameterType，加@param("xxx")注解

在mapper接口中加上@param("xxx")注解，则在配置文件中直接用即可

List<Map<String, Object>> getDataByTime(@Param("startTime") String startTime, @Param("endTime") String endTime, @Param("platformId") Long platformId);

<select id="getDataByTime" resultType="java.util.Map">
      SELECT
        t.seller_id as sellerId,
        sum(t.payment_price) as total,
      FROM
        trade_orders t
      WHERE
        AND
          t.platform_id = #{platformId}
        <if test="startTime != null and startTime != ''">
        AND
            <![CDATA[t.order_time >= #{startTime}]]>
        </if>
        <if test="endTime != null and endTime != ''">
        AND
          <![CDATA[t.order_time <= #{endTime}]]>
        </if>
        GROUP BY
          t.seller_id
    </select>

方法二：忽略parameterType，不加@param("xxx")注解

用#｛index｝，是第几个就用第几个的索引，索引从0开始

List<Map<String, Object>> getDataByTime(String startTime, String endTime, Long platformId);

<select id="getDataByTime" resultType="java.util.Map">
      SELECT
        t.seller_id as sellerId,
        sum(t.payment_price) as total,
      FROM
        trade_orders t
      WHERE
        AND
          t.platform_id = #{3}
        <if test="startTime != null and startTime != ''">
        AND
            <![CDATA[t.order_time >= #{0}]]>
        </if>
        <if test="endTime != null and endTime != ''">
        AND
          <![CDATA[t.order_time <= #{1}]]>
        </if>
        GROUP BY
          t.seller_id
    </select>

方法三：使用Map封装参数，parameterType=“hashmap”

封装好后，直接在配置文件引用#{key}即可

List<Map<String, Object>> getDataByTime(HashMap map);

<select id="getDataByTime" parameterType="hashmap" resultType="java.util.Map">
      SELECT
        t.seller_id as sellerId,
        sum(t.payment_price) as total,
      FROM
        trade_orders t
      WHERE
        AND
          t.platform_id = #{platformId}
        <if test="startTime != null and startTime != ''">
        AND
            <![CDATA[t.order_time >= #{startTime}]]>
        </if>
        <if test="endTime != null and endTime != ''">
        AND
          <![CDATA[t.order_time <= #{endTime}]]>
        </if>
        GROUP BY
          t.seller_id
    </select>

方法四：使用List封装参数

mapper配置文件使用foreach标签循环list

List<Map<String, Object>> getDataByTime(List<String> list);

<select id="getXXXBeanList" resultType="java.util.Map">
　　select XX from trade_orders where id in
　　<foreach item="item" index="index" collection="list" open="(" separator="," close=")">
　　　　#{item}
　　</foreach>
</select>