diff --git a/backend-spring/src/main/resources/mapper/externalRestApiConnection.xml b/backend-spring/src/main/resources/mapper/externalRestApiConnection.xml
index 9b4434e8..dca8cf4f 100644
--- a/backend-spring/src/main/resources/mapper/externalRestApiConnection.xml
+++ b/backend-spring/src/main/resources/mapper/externalRestApiConnection.xml
@@ -69,7 +69,7 @@
     SELECT
         <include refid="selectColumns"/>
     FROM EXTERNAL_REST_API_CONNECTIONS E
-    WHERE E.ID = #{id}
+    WHERE E.ID = #{id}::varchar
     <include refid="common.companyCodeFilter"/>
   </select>
 
@@ -133,14 +133,14 @@
       <if test="save_to_history != null">SAVE_TO_HISTORY = #{save_to_history},</if>
       <if test="updated_by != null">UPDATED_BY = #{updated_by},</if>
     </set>
-    WHERE ID = #{id}
+    WHERE ID = #{id}::varchar
     <include refid="common.companyCodeFilter"/>
   </update>
 
   <!-- 연결 삭제 -->
   <delete id="deleteExternalRestApiConnection" parameterType="map">
     DELETE FROM EXTERNAL_REST_API_CONNECTIONS
-    WHERE ID = #{id}
+    WHERE ID = #{id}::varchar
     <include refid="common.companyCodeFilter"/>
   </delete>
 
@@ -151,7 +151,7 @@
         LAST_TEST_DATE = NOW()
         , LAST_TEST_RESULT = #{last_test_result}
         , LAST_TEST_MESSAGE = #{last_test_message}
-    WHERE ID = #{id}
+    WHERE ID = #{id}::varchar
   </update>
 
   <!-- DB 토큰 조회 (db-token auth type) -->