ASP.NET连SQL7接口源代码

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ample shows what a simple ADO.NET application that connects to the Northwind database and returns a list of Categories would look like. The example writes the output to the console, or command prompt.

The following example shows what a simple ADO.NET application that connects to the Northwind database and returns a list of Categories. The example writes the output to the console, or command prompt.

SQLClient
[Visual Basic]
Imports System
Imports System.Data
Imports System.Data.SQLClient
Imports Microsoft.VisualBasic

Public Class Sample

Public Shared Sub Main()
Dim nwindConn As SQLConnection = New SQLConnection("Data Source=localhost;" & _
"User Id=sa;Password=pwd;Initial Catalog=northwind")

Dim catCMD As SQLCommand = nwindConn.CreateCommand()
catCMD.CommandText = "SELECT CategoryID, CategoryName FROM Categories"

nwindConn.Open()

Dim myReader As SQLDataReader = catCMD.ExecuteReader()

Do While myReader.Read()
Console.WriteLine(vbTab & "{0}" & vbTab & "{1}", myReader.GetInt32(0), myReader.GetString(1))
Loop

myReader.Close()
nwindConn.Close()
End Sub
End Class
[C#]
using System;
using System.Data;
using System.Data.SQLClient;

class Sample
{
public static void Main()
{
SQLConnection nwindConn = new SQLConnection("Data Source=localhost;User Id=sa;Password=pwd;Initial Catalog=northwind");

SQLCommand catCMD = nwindConn.CreateCommand();
catCMD.CommandText = "SELECT CategoryID, CategoryName FROM Categories";

nwindConn.Open();

SQLDataReader myReader = catCMD.ExecuteReader();

while (myReader.Read())
{
Console.WriteLine("/t{0}/t{1}", myReader.GetInt32(0), myReader.GetString(1));
}

myReader.Close();
nwindConn.Close();
}
}
OleDb
[Visual Basic]
Imports System
Imports System.Data
Imports System.Data.OleDb
Imports Microsoft.VisualBasic

Public Class Sample

Public Shared Sub Main()
Dim nwindConn As OleDbConnection = New OleDbConnection("Provider=SQLOLEDB;Data Source=localhost;" & _
"User Id=sa;Password=pwd;Initial Catalog=northwind")

Dim catCMD As OleDbCommand = nwindConn.CreateCommand()
catCMD.CommandText = "SELECT CategoryID, CategoryName FROM Categories"

nwindConn.Open()

Dim myReader As OleDbDataReader = catCMD.ExecuteReader()

Do While myReader.Read()
Console.WriteLine(vbTab & "{0}" & vbTab & "{1}", myReader.GetInt32(0), myReader.GetString(1))
Loop

myReader.Close()
nwindConn.Close()
End Sub
End Class
[C#]
using System;
using System.Data;
using System.Data.OleDb;

class Sample
{
public static void Main()
{
OleDbConnection nwindConn = new OleDbConnection("Provider=SQLOLEDB;Data Source=localhost;User Id=sa;Password=pwd;Initial Catalog=northwind");

OleDbCommand catCMD = nwindConn.CreateCommand();
catCMD.CommandText = "SELECT CategoryID, CategoryName FROM Categories";

nwindConn.Open();

OleDbDataReader myReader = catCMD.ExecuteReader();

while (myReader.Read())
{
Console.WriteLine("/t{0}/t{1}", myReader.GetInt32(0), myReader.GetString(1));
}

myReader.Close();
nwindConn.Close();
}
}

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