fix：用户昵称作为一校验，用户新增、编辑和导入都增加校验

ktg-system/src/main/resources/mapper/system/SysUserMapper.xml

@@ -145,7 +145,10 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	<select id="checkEmailUnique" parameterType="String" resultMap="SysUserResult">
 		select user_id, email from sys_user where email = #{email} limit 1
 	</select>
-	
+	<select id="checkUserNickNameUnique" resultType="java.lang.Integer">
+		select count(1) from sys_user where nick_name = #{nickName} limit 1
+	</select>
+
 	<insert id="insertUser" parameterType="SysUser" useGeneratedKeys="true" keyProperty="userId">
  		insert into sys_user(
  			<if test="userId != null and userId != 0">user_id,</if>