diff --git a/src/main/resources/mapper/RoleMapper.xml b/src/main/resources/mapper/RoleMapper.xml
index 60ca414..e5a201b 100644
--- a/src/main/resources/mapper/RoleMapper.xml
+++ b/src/main/resources/mapper/RoleMapper.xml
@@ -23,6 +23,7 @@
         <where>
             role_name = #{roleName}
         </where>
+        limit 1
     </select>
 
     <select id="selectByRoleId" resultType="com.example.demo.domain.entity.Role">