使用序号访问SqlDataReader中指定列的数据
// 使用序号访问SqlDataReader中指定列的数据
// OrdinalIndexer.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Text;
namespace Ch12
{
class OrdinalIndexer
{
static void Main( string[] args)
{
string strConn = "server=.\\MSSQL2012;integrated security=true;database=Northwind;";
string sql = "select firstname,lastname from employees" ;
string strline = "==";
SqlConnection conn = new SqlConnection(strConn);
try
{
conn.Open();
SqlCommand cmd = new SqlCommand(sql, conn);
//创建数据读取器
SqlDataReader reader = cmd.ExecuteReader();
// 在"First Name"的前面填充空格,使其总长度达到11个
Console.WriteLine( "{0} Last Name", "First Name".PadLeft(11));
// 在"=="前后各填充"="，使其总长度达到11
Console.WriteLine( "{0} {1}", strline.PadLeft(11, '=' ), strline.PadRight(11, '='));
while (reader.Read())
{
Console.WriteLine( "{0} | {1}",
reader[0].ToString().PadLeft(11),
reader[1].ToString());
}
reader.Close();
}
catch( Exception ex)
{
Console.WriteLine( "发生错误:" + ex);
}
finally
{
conn.Close();
Console.ReadLine();
}
}
}
}
----------------------------
First Name Last Name
=========== ===========
Nancy | Davolio
Andrew | Fuller
Janet | Leverling
Margaret | Peacock
Steven | Buchanan
Michael | Suyama
Robert | King
Laura | Callahan
Anne | Dodsworth
