Question

我有一个包含100行的数据集的平面文件和2001这样的属性：

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

我想将此数据预处理为

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

所以我摆脱了最后一列的类型，我在sql中km我会做类似的事情：

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

但是我想在SQL中导入表格，但代码如何在c＃中显示

Answer 1

以下是一些C＃的概念，它将获取您的输入文件并重新格式化您正在请求的内容。然后使用SqlBulkCopy类将数据推送到SQLServer中的表中。

希望它有所帮助。

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++;
                     }
                }
          }
     }
}

数据集SQL的预处理

1 个答案: