fix:用户删除后，数据库状态为删除；但是新建用户时，验证是否已存在的sql未将已删除数据剔除，导致新建用户若验证信息已存在，无法新建。

ruoyi-modules/ruoyi-system/src/main/resources/mapper/system/SysUserMapper.xml

@@ -122,7 +122,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	
 	<select id="selectUserByUserName" parameterType="String" resultMap="SysUserResult">
 	    <include refid="selectUserVo"/>
-		where u.user_name = #{userName}
+		where u.del_flag = '0' and u.user_name = #{userName}
 	</select>
 	
 	<select id="selectUserById" parameterType="Long" resultMap="SysUserResult">
@@ -131,15 +131,15 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 	</select>
 	
 	<select id="checkUserNameUnique" parameterType="String" resultType="int">
-		select count(1) from sys_user where user_name = #{userName} limit 1
+		select count(1) from sys_user where del_flag = '0' and user_name = #{userName} limit 1
 	</select>
 	
 	<select id="checkPhoneUnique" parameterType="String" resultMap="SysUserResult">
-		select user_id, phonenumber from sys_user where phonenumber = #{phonenumber} limit 1
+		select user_id, phonenumber from sys_user where del_flag = '0' and phonenumber = #{phonenumber} limit 1
 	</select>
 	
 	<select id="checkEmailUnique" parameterType="String" resultMap="SysUserResult">
-		select user_id, email from sys_user where email = #{email} limit 1
+		select user_id, email from sys_user where del_flag = '0' and email = #{email} limit 1
 	</select>
 	
 	<insert id="insertUser" parameterType="SysUser" useGeneratedKeys="true" keyProperty="userId">