diff --git a/ms-dal/src/main/resources/mapper/DsMessageMapper.xml b/ms-dal/src/main/resources/mapper/DsMessageMapper.xml
index 4397f08..b97f9da 100644
--- a/ms-dal/src/main/resources/mapper/DsMessageMapper.xml
+++ b/ms-dal/src/main/resources/mapper/DsMessageMapper.xml
@@ -41,6 +41,7 @@
         <if test="purchaseOrderSn != null">
             and data like '%${purchaseOrderSn}%'
         </if>
+        limit 1
     </select>
     <delete id="deleteByPrimaryKey" parameterType="java.lang.Long">
         delete from ds_message