ADO.NET快速入门——使用DataSet返回数据

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 using System.Data;
 7 using System.Data.SqlClient;
 8 
 9 namespace ConsoleApplication10
10 {
11     class Program
12     {
13         static void Main(string[] args)
14         {
15             string strConn = @"server=Joe-PC;database=AdventureWorks_WroxSSRS2012;uid=sa;pwd=root";
16             SqlConnection conn = new SqlConnection(strConn);
17 
18             DataSet ds = new DataSet();
19 
20             string strCmd1 = "SELECT ProductCategoryID,Name FROM Production.ProductCategory";
21             SqlDataAdapter da1 = new SqlDataAdapter(strCmd1, conn);
22             // 将第一个查询结果集合填入DataSet中，并且将DataTable命名为"Category"
23             da1.Fill(ds, "Category");
24 
25             string strCmd2 = "SELECT ProductSubcategoryID,ProductCategoryID,Name From Production.ProductSubcategory";
26             SqlDataAdapter da2 = new SqlDataAdapter(strCmd2, conn);
27             // 将第二个查询结果集合填入DataSet中，并且将DataTable命名为"Subategory"
28             da2.Fill(ds, "Subcategory");
29 
30             // 使用视图
31             // 打印表中的数据
32             Console.WriteLine("主类别表：");
33             DataTable dt1 = ds.Tables["Category"];//获得Category表
34             DataView dv1 = new DataView(dt1); //创建视图
35             dv1.Sort = "ProductCategoryID ASC"; //设置排序规则
36             foreach (DataRowView drv in dv1)
37             {
38                 Console.WriteLine("{0}:{1}", drv[0], drv["Name"]);
39             }
40 
41             Console.WriteLine("");
42 
43             Console.WriteLine("过滤后的子类别表：");
44             DataTable dt2 = ds.Tables["Subcategory"];
45             DataView dv2 = new DataView(dt2);
46             dv2.RowFilter = "ProductSubcategoryID>10";//设置过滤条件
47             dv2.Sort = "ProductSubcategoryID ASC";
48             foreach (DataRowView drv in dv2)
49             {
50                 Console.WriteLine("{0}:{1}", drv[0], drv["Name"]);
51             }
52 
53             Console.WriteLine("");
54 
55             // 在两个表之间建立关联
56             DataRelation relation = new DataRelation("ProductCategory_ProductSubcategory",
57                 dt1.Columns["ProductCategoryID"], dt2.Columns["ProductCategoryID"]);
58             ds.Relations.Add(relation);//将关联添加到DataSet的集合中
59             try
60             {
61                 for (int i = 0; i < dt1.Rows.Count; i++)
62                 {
63                     DataRow dri = dt1.Rows[i];
64                     //根据关联找到数据相关的子类别数据
65                     DataRow[] subRows = dri.GetChildRows(relation);
66                     Console.WriteLine("{0}的子类别信息：", dri["Name"]);
67                     foreach (DataRow dr in subRows)
68                     {
69                         Console.WriteLine("{0}:{1}", dr[0], dr["Name"]);
70                     }
71                     Console.WriteLine("");
72                 }
73             }
74             catch (Exception e)
75             {
76                 Console.WriteLine(e);
77             }
78         }
79     }
80 }