sqlserver 递归删除组织结构树

/// <summary>
        /// 递归删除岗位节点
        /// </summary>
        /// <param name="PK_ROLE_ID"></param>
        /// <param name="isPost"></param>
        /// <returns></returns>
        public bool DeletePosts(int PK_ROLE_ID)
		{
			
			StringBuilder strSql=new StringBuilder();


             strSql.Append("   WITH post(PK_ROLE_ID, ROLE_FATHER, ROLE_NAME) AS ");
             strSql.Append("       (    ");
             strSql.Append("           SELECT  R.PK_ROLE_ID, R.ROLE_FATHER, R.ROLE_NAME");
             strSql.Append("           FROM [ROLE] R WHERE PK_ROLE_ID=@PK_ROLE_ID");
             strSql.Append("           UNIon ALL");
             strSql.Append("           SELECT sub.PK_ROLE_ID, sub.ROLE_FATHER, sub.ROLE_NAME");
             strSql.Append("           FROM [ROLE] sub, post super");
             strSql.Append("           WHERE sub.ROLE_FATHER = super.PK_ROLE_ID");
             strSql.Append("       )");
             strSql.Append("   delete from [ROLE] where PK_ROLE_ID in(");
             strSql.Append("   select PK_ROLE_ID from post");
             strSql.Append("   )");

			SqlParameter[] parameters = {
					new SqlParameter("@PK_ROLE_ID", SqlDbType.Int,4)
};
			parameters[0].Value = PK_ROLE_ID;

			int rows=DbHelperSQL.ExecuteSql(strSql.ToString(),parameters);
			if (rows > 0)
			{
				return true;
			}
			else
			{
				return false;
			}
		}