技術標籤：java筆記分享mysqlspring bootmybatis

錯誤提示：

[aad8bbfc419f1d20]Caused by: org.apache.ibatis.exceptions.PersistenceException: 
[aad8bbfc419f1d20]### Error querying database.  Cause: java.lang.NullPointerException: target is null for method size
[aad8bbfc419f1d20]### Cause: java.lang.NullPointerException:
 
 target is null for method size

排查：

空指標肯定是某個屬性沒繫結上

 <select id="findRepertoryDayTotal" resultType="int">
        select
        count(*)
        from cluster_sams.app_sams_cloud_item_inventory_days_d
        <where>
            <!-- 時間為空, 預設日期 -->
            <
 
if test="(repertoryDateStart == null or repertoryDateStart == '') or (repertoryDateEnd == null or repertoryDateEnd == '')">
                and event_date between yesterday() and today()
            </if>
            <!-- 時間不為空, 庫存日期 -->
            <if test="(repertoryDateStart != null and repertoryDateStart != '
 
') and (repertoryDateEnd != null and repertoryDateEnd != '')">
                and event_date between #{repertoryDateStart} and #{repertoryDateEnd}
            </if>
            <!-- 商品號 -->
            <if test="itemNumber != null and itemNumber.size() != 0">
                and item_nbr in
                <foreach collection="itemNumber" item="item" open="(" close=")" separator="," index="index">
                    #{item}
                </foreach>
            </if>
            <!-- 城市 -->
            <if test="cities != null and cities.size() != 0">
                and storage_city_cn in
                <foreach collection="cities" item="city" open="(" close=")" separator="," index="index">
                    #{city}
                </foreach>
            </if>
            <!-- 母店 -->
            <if test="stores != null and stores.size() != 0">
                and store_id in
                <foreach collection="stores" item="storeId" open="(" close=")" separator="," index="index">
                    #{storeId}
                </foreach>
            </if>
            <!-- 雲倉 -->
            <if test="positions != null and position.size() != 0">
                and position in
                <foreach collection="position" item="pos" open="(" close=")" separator="," index="index">
                    #{pos}
                </foreach>
            </if>
            <!-- 分割槽 -->
            <if test="divisions != null and divisions.size() != 0">
                and division in
                <foreach collection="divisions" item="div" open="(" close=")" separator="," index="index">
                    #{div}
                </foreach>
            </if>
            <!-- 類別 -->
            <if test="category != null and category.size() != 0">
                and category in
                <foreach collection="category" item="cate" open="(" close=")" separator="," index="index">
                    #{cate}
                </foreach>
            </if>
        </where>
    </select>

排查了一下 postions漏了一個s

解決

仔細排查一下，是不是某個屬性，寫錯了或者某個條件寫錯了，導致無法獲取繫結屬性。