本文介绍了使用sqlserver从sqldatareader获取数据的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
大家好，
我是C＃的新手。我试图使用返回类型为'SqlDataReader'的函数填充datareader但不幸的是它给出了一些错误。任何建议都会非常感激。
谢谢，
Akky
Hi guys,
I am new to C#. I am trying to fill a datareader using a function with return type as 'SqlDataReader' but unfortunately its giving some error. Any advice would be really appreciated.
Thanks,
Akky
public static void Main(string[] args)
{
SqlDataReader dr = Program.hello("select top 10 firstName,lastName from DimCustomer");
while (dr.Read())
{
Console.WriteLine(dr.GetValue(0));
}
Console.ReadLine();
}
public static SqlDataReader hello(string query)
{
SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=adventure_works;Integrated Security=true;");
SqlCommand cmd = new SqlCommand(query, con);
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
con.Close();
return dr;
}
推荐答案
using System;
using System.Data.SqlClient;
namespace RestApp
{
class Program
{
public static void Main(string[] args)
{
SqlDataReader dr = Program.hello("select top 10 firstName,lastName from DimCustomer");
while (dr.Read())
{
Console.WriteLine(dr.GetValue(0));
}
Console.ReadLine();
}
public static SqlDataReader hello(string query)
{
SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=adventure_works;Integrated Security=true;");
SqlCommand cmd = new SqlCommand(query, con);
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
return dr;
}
}
}
class Program
{
static SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=adventure_works;Integrated Security=true;");
public static void Main(string[] args)
{
SqlDataReader dr = Program.hello("select top 10 firstName,lastName from DimCustomer");
while (dr.Read())
{
Console.WriteLine(dr.GetValue(0));
}
con.Close();
Console.ReadLine();
}
public static SqlDataReader hello(string query)
{
SqlCommand cmd = new SqlCommand(query, con);
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
return dr;
}
}
while (reader.Read())
{
// Do something with rows
for( int i = 0; i < reader.FieldCount; i++ ){
}
//... or
string field = (string)reader["column1"];
}
详情请参阅这些链接
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