唯一限制条件只返回单条数据

ruoyi-system/src/main/resources/mapper/system/SysRoleMapper.xml

@@ -80,12 +80,12 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	
 	<select id="checkRoleNameUnique" parameterType="String" resultMap="SysRoleResult">
 		<include refid="selectRoleVo"/>
-		 where r.role_name=#{roleName}
+		 where r.role_name=#{roleName} limit 1
 	</select>
 	
 	<select id="checkRoleKeyUnique" parameterType="String" resultMap="SysRoleResult">
 		<include refid="selectRoleVo"/>
-		 where r.role_key=#{roleKey}
+		 where r.role_key=#{roleKey} limit 1
 	</select>
 	
  	<insert id="insertRole" parameterType="SysRole" useGeneratedKeys="true" keyProperty="roleId">