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  • 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)));
    }


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  • 原文地址:https://www.cnblogs.com/smartsmile/p/6234019.html
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