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ASP.NET連SQL7接口源代碼

   The following example 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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