mybatis中mapper介面的引數設定幾種方法

摘要： 方法一：忽略parameterType，加@param("xxx")註解 在mapper介面中加上@param("xxx")註解，則在配置檔案中直接用即可 List<Map<String, Object>> getDataB...

方法一：忽略parameterType，加@param("xxx")註解

在mapper介面中加上@param("xxx")註解，則在配置檔案中直接用即可

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")註解

用#｛index｝，是第幾個就用第幾個的索引，索引從0開始

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封裝引數，parameterType=“hashmap”

封裝好後，直接在配置檔案引用#{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封裝引數

mapper配置檔案使用foreach標籤迴圈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>