ASP.NET连SQL7接口源代码_.Net教程

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 　　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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