预处理

Question

我有100行和2001的属性这样的数据集的平面文件：

att1,att2,att4,att5,att6,att7,att8,att9,att10,....,att2000,type 
5,3,4,4,1,5,1,3,2,4,...,12,Agresti 
4,4,2,0,1,0,2,0,0,0,...,22,bbresti 
0,0,0,0,0,0,0,0,1,0,...,34,bbresti 
0,0,0,1,0,0,0,1,1,1,...,45,Agresti 
... 
0,6,0,0,0,0,1,0,3.5,...,1,Agresti 

而且我想预处理这个数据

i,j,val 
1,1,5 
1,2,4 
1,3,0 
1,4,0 
... 
1,100,0 
2,1,3 
2,2,4 
2,3,0 
2,4,0 
... 
2,100,6 
3,1,4 
3,2,2 
3,3,0 
3,4,0 
... 
... 
2000,100,1 

，所以我得到去掉最后一列的类型，我kmow在SQL我会做这样的事情：

CREATE TABLE matrix (Row int NOT NULL, Column int NOT NULL, Value <datatype> NOT NULL) 

SELECT Row AS Column 
     ,Column AS Row 
     ,Value 
FROM matrix 

但是，当我想只进口在SQL中的表，但代码看起来像在c＃

Answer 1

这里有一些C＃的想法，将采取您的输入文件，并重新格式化您请求。然后使用SqlBulkCopy类将数据上传到SQLServer中的表中。

希望它有帮助。

using System.IO; 

namespace ConsoleApplication1 
{ 
    class Program 
    { 
      static void Main(string[] args) 
      { 
       string[] parts; 
       //string[] lines = System.IO.File.ReadAllLines(@"somefile.csv"); 
       string[] lines = new string[] { 
        "a1,a2,a3,a4,type", 
        "22,33,44,55,t1", 
        "222,333,444,555,t2", 
        "2222,3333,4444,5555,t3" }; 
       int lineno = 1; 

       string path = @"c:\output.csv"; 
       using (TextWriter writer = File.CreateText(path)) 
       { 
        foreach (string line in lines) 
        { 
          if (lineno > 1) 
          { 
           parts = line.Split(','); 
           for (int a = 0; a < parts.Length - 1; a++) 
            writer.WriteLine(lineno.ToString() + "," + (a+1).ToString() + "," + parts[a]); 
          } 
          lineno++; 
        } 
       } 
      } 
    } 
}