zoukankan      html  css  js  c++  java
  • SqlServer与Linq 无限递归目录树且输出层级

    ALTER VIEW [dbo].[view_TreeLevel]
    AS
    WITH cte
    AS (
    SELECT a.ModuleID ,
           a.Module_Name ,
           a.Module_Description ,
           a.Module_FatherID ,
           a.Module_Url ,
           a.Module_Order, 1 Level FROM TT_TreeView a WHERE a.Module_FatherID=0
    UNION ALL 
    SELECT b.ModuleID ,
           b.Module_Name ,
           b.Module_Description ,
           b.Module_FatherID ,
           b.Module_Url ,
           b.Module_Order, Level+1 FROM TT_TreeView b INNER JOIN cte c ON b.Module_FatherID = c.ModuleID
    )
    SELECT TOP 100 PERCENT * FROM cte ORDER BY Level

    CREATE TABLE [dbo].[AreaTable](  
    [Id] int PRIMARY KEY IDENTITY(1,1) NOT NULL,  
    [Name] [varchar](50) NOT NULL,  
    [Parent] int NOT NULL,  
    )  
    GO  
      
    INSERT INTO [AreaTable]    
    SELECT '中国',0 UNION ALL  
    SELECT '广东',1 UNION ALL  
    SELECT '湖南',1 UNION ALL  
    SELECT '深圳',2 UNION ALL  
    SELECT '长沙',3 UNION ALL  
    SELECT '福田',4 UNION ALL  
    SELECT '南山',4 UNION ALL  
    SELECT '天心',5 UNION ALL  
    SELECT '岳麓',5 UNION ALL  
    SELECT '芙蓉',5 UNION ALL  
    SELECT '蛇口',7 UNION ALL  
    SELECT '科技园',7   
    GO  
    
    --查询全国  
    WITH temp  
    AS  
    (  
    SELECT *,1 Level FROM [AreaTable]  WHERE Parent = 1  --1全国  2广东
    UNION ALL  
    SELECT m.*,Level+1  FROM [AreaTable]  AS m  
    INNER JOIN temp AS child ON m.Parent = child.Id  
    )  
    SELECT * FROM temp ORDER BY temp.Level

    void Main()  
    {  
    	var query = GetChildren(2);  //Linq递归查询方法
    	Console.WriteLine("Id	Name	Parent");
    	query.ToList().ForEach(q => Console.WriteLine("{0}	{1}	{2}", q.Id, q.Name, q.Parent));
    } 
    
    private IEnumerable<AreaTable> GetChildren(int p_id)
    {
    	var query = RBAC.Dal.DataRootBase.Context.From<AreaTable>().Where(p => p.Parent == p_id);
    	return query.ToList().Concat(query.ToList().SelectMany(t => GetChildren(t.Id)));
    }


  • 相关阅读:
    New Skateboard
    Mike and strings
    C语言异或运算在程序设计中的妙用
    快速排序
    贪心算法
    快速排序过程分析
    深度搜索C语言伪代码
    matlab 中“newff” 函数的参数设置
    一维小波分解与去噪重构
    matlab绘图(详细)(全面)
  • 原文地址:https://www.cnblogs.com/smartsmile/p/6234019.html
Copyright © 2011-2022 走看看