DataAdapter与DataSet的使用

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Data;
 6 using System.Data.SqlClient;
 7 
 8 namespace adapterTest
 9 {
10     class Program{
11         static void Main(string[] args){
12             //创建数据库连接
13             SqlConnection conn = new SqlConnection("Data Source=HZ-PC;Initial Catalog=mydb;Persist Security Info=True;User ID=sa;Password=123");
14             //创建数据适配器
15             SqlDataAdapter da = new SqlDataAdapter("select *from db_line;", conn);
16             //创建空数据集
17             DataSet ds = new DataSet();
18             //使用数据适配器的Fill方法填充数据集
19             da.Fill(ds,"db_line");
20             //从表集合中取出表db_line
21             DataTable dt = ds.Tables["db_line"];
22             //嵌套循环，输出每行的每列
23             foreach (DataRow row in dt.Rows) {
24                 foreach(DataColumn col in dt.Columns){
25                     Console.Write("{0}   ",row[col]);
26                 }
27                 Console.WriteLine();
28                 Console.WriteLine("".PadLeft(20,‘=‘));
29             }
30             int age = (int)HZ.age;
31             Console.WriteLine(HZ.sex);
32 
33         }
34         public enum HZ{ 
35             age=22,
36             height=172,
37             sex=‘M‘,
38         }
39     }
40 }