vb.net的數(shù)據(jù)庫怎么連接啊?

Dim

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sqlConnection1

As

SqlClient.SqlConnection

　Dim

strConnect

As

String=”data

source=服務(wù)器名;initial

catalog=數(shù)據(jù)庫名;user

id=sa;password=;”

sqlConnection1=New

System.Data.SqlClient.SqlConnection(strConnect)

　sqlConnection1.open

‘打開數(shù)據(jù)庫

sqlConnection1.close

‘關(guān)閉連接，釋放資源

1)連接Sql

Server數(shù)據(jù)庫

Dim

odbcDbConnetion1

As

Microsoft.Data.OdbcConnection

　Dim

strConnect

As

Sting=”Driver={SQL

Server};Server=服務(wù)器名;Uid=sa;pwd=;Database=

數(shù)據(jù)庫名;”

　odbcDbConnetion1=New

Microsoft.Data.OdbcConnection(strConnect)

vb.net的數(shù)據(jù)庫連接

1·綁定數(shù)據(jù)源來進(jìn)行連接

2.用代碼連接

先到數(shù)據(jù)庫建立一個(gè)數(shù)據(jù)庫和相應(yīng)的表

連接數(shù)據(jù)庫的代碼：

Dim str As String = "Data Source=服務(wù)器名;Initial Catalog=數(shù)據(jù)庫名;Persist Security Info=True;User ID=;Password="

dim conn As SqlClient.SqlConnection

try

conn = New SqlClient.SqlConnection

conn.ConnectionString = str

conn.Open()

Return True

Catch ex As Exception

MsgBox(ex.ToString)

Return False

End Try

登錄代碼：Dim str As String = "Data Source=服務(wù)器名;Initial Catalog=數(shù)據(jù)庫名;Persist Security Info=True;User ID=;Password="

dim conn As SqlClient.SqlConnection

conn = New SqlClient.SqlConnection

conn.ConnectionString = str

conn.Open()

sqlstr = "Select * From Amd Where AmdName='" TextBox1.Text "' And AmdPwd = '" TextBox2.Text "'"

Dim sqlcmd As SqlClient.SqlCommand = New SqlClient.SqlCommand(sqlstr, conn)

Dim dr As SqlClient.SqlDataReader

dr = sqlcmd.ExecuteReader

If dr.Read = True Then '判斷一條記錄為真

kf.Show() '顯示下個(gè)窗體

Me.Hide() ’隱藏當(dāng)前窗體

Else

MessageBox.Show("輸入信息有誤！", "提示")

TextBox1.Text = ""

TextBox2.Text = ""

End If

vb.net 使用模塊連接數(shù)據(jù)庫

你說這么一大篇全是業(yè)務(wù)邏輯，沒說明你遇到的技術(shù)性問題在哪

.net自帶的config文件來配置連接字符串，比ini好N倍，如果你非要用ini那么自己解決問題

檢測(cè)是否能連接用Connection.Open加try catch就可以

vb.net連接數(shù)據(jù)庫

1、 用The SQL Server .NET Data Provider連接數(shù)據(jù)庫

The SQL Server .NET Data Provider是利用SqlConnection類來連接SQL Server7.0或更高版本的數(shù)據(jù)庫，

SqlConnection類位于名稱空間System.Data.SqlClient下。

連接代碼：

Dim sqlConnection1 As SqlClient.SqlConnection

Dim strConnect As String=”data source=服務(wù)器名;initial catalog=數(shù)據(jù)庫名;user id=sa;password=;”

sqlConnection1=New System.Data.SqlClient.SqlConnection(strConnect)

sqlConnection1.open ‘打開數(shù)據(jù)庫

sqlConnection1.close ‘關(guān)閉連接，釋放資源

2、 用The OLE DB .NET Data Provider連接數(shù)據(jù)庫

上面已經(jīng)說過，利用The OLE DB .NET Data Provider可以訪問Access、Oracle和SQL Server等種數(shù)據(jù)

庫，那么，它是怎樣訪問這些數(shù)據(jù)庫的呢？The OLE DB .NET Data Provider是通過位于名稱空間Sy

stem.Data.OleDb類庫下的OleDbConnection類來連接這三種不同類型的數(shù)據(jù)庫的。下面舉例說明:

1)連接SQL Server數(shù)據(jù)庫

Dim oleDbConnection1 As OleDb.OleDbConnection

Dim strConnect As Sting=”Provider=SQLOLEDB;Persist Security Info=False;Data Source=服務(wù)器名;Initial Catalog=數(shù)據(jù)庫名;User ID=sa;Password=;”

oleDbConnection1=New System.Data.OleDb.OleDbConnection(strConnect)

2)連接Access數(shù)據(jù)庫

假設(shè)要連接的Access數(shù)據(jù)庫名為“Example.mdb”，存放在d:\Data\目錄下。

Dim oleDbConnection1 As OleDb.OleDbConnection

Dim strConnect As Sting=”Provider=Microsoft.Jet.OLEDB.4.0;Data Source=d:\Data\ Example.mdb”

oleDbConnection1= New System.Data.OleDb.OleDbConnection(strConnect)

3)連接Oracle數(shù)據(jù)庫

Dim oleDbConnection1 As OleDb.OleDbConnection

Dim strConnect As Sting=”Provider=MSDAORA;Data Source=服務(wù)器名;User ID=用戶ID;Password=密碼;”

oleDbConnection1= New System.Data.OleDb.OleDbConnection(strConnect)

3、 用The ODBC .NET Data Provider連接數(shù)據(jù)庫

The ODBC .NET Data Provider連接數(shù)據(jù)庫是通過OdbcConnection類來實(shí)現(xiàn)的，這個(gè)類位于名稱空間

Microsoft.Data.Odbc下，而名稱空間Microsoft.Data.Odbc是封裝在Microsoft.Data.Odbc.dll文件下的。

由于篇幅有限，這里就只介紹連接Sql Server和Oracle數(shù)據(jù)庫的方法，其他數(shù)據(jù)庫的連接方法基本類

似，我就不再多講了。

1)連接Sql Server數(shù)據(jù)庫

Dim odbcDbConnetion1 As Microsoft.Data.OdbcConnection

Dim strConnect As Sting=”Driver={SQL Server};Server=服務(wù)器名;Uid=sa;pwd=;Database= 數(shù)據(jù)庫名;”

odbcDbConnetion1=New Microsoft.Data.OdbcConnection(strConnect)

2)連接Oracle數(shù)據(jù)庫

Dim odbcDbConnetion1 As Microsoft.Data.OdbcConnection

Dim strConnect As Sting=”Driver={Microsoft ODBC for Oracle};Server=服務(wù)器名;Uid=sa;pwd=;”

odbcDbConnetion1=New Microsoft.Data.OdbcConnection(strConnect)

四、總結(jié)

通過本文的介紹，讀者基本掌握了在Visual Basic.NET中用ADO.NET和ODBC.NET連接各種數(shù)據(jù)庫的方法

。以上三種驅(qū)動(dòng)針對(duì)不同的數(shù)據(jù)庫，它們的性能方面也有很大的不同：The SQL Server .NET Data Provider

的效率最高；The OLE DB .NET Data Provider的效率比較底；The ODBC .NET Data Provider的效率最慢。

具體連接哪一種數(shù)據(jù)庫選用哪一種數(shù)據(jù)驅(qū)動(dòng)要從工作效率方面來考慮。

以上回答你滿意么？

VB.NET對(duì)SQL數(shù)據(jù)庫怎樣連接??？求代碼？

VB.NET中有控件可以真接接點(diǎn)擊屬性進(jìn)行連接配置.

SqlConnect數(shù)據(jù)連接控件.點(diǎn)擊ConnectionString屬性進(jìn)行配置就可以了.

VB.NET中沒有RecordSet了.取而代之的是DataSet.

在VB.net中可以先用SqlConnection對(duì)像來連接數(shù)據(jù)庫再用SqlDataAdapter對(duì)像來讀取數(shù)據(jù)并填充到DataSet里.然后就可以進(jìn)行數(shù)據(jù)綁定了.

例:

dim

conn

as

SqlConnection

dim

da

as

SqlDataAdapter

dim

ds

as

Dataset

set

conn

=

new

SqlConnection

conn.ConnectionString="server=serverIP;database=databasename;uid=userid;pwd=password";

conn.open

da

=

new

SqlDataAdapter

(,conn)

da.fill(ds)

VB.NET怎樣連接數(shù)據(jù)庫

Imports System.Data

Imports System.Data.SqlClient

Module 連接數(shù)據(jù)庫

Public Server1 As String

Public DataBase1 As String

Public Function GetTable(ByVal sqlstr$) As DataTable

Dim SqlConn As SqlConnection = New SqlConnection("server=" Server1 ";database=" DataBase1 ";integrated security=true") '聲明這些SQL的類

Dim facDataAdapter As SqlDataAdapter = New SqlDataAdapter

Dim SqlComm As SqlCommand = New SqlCommand(sqlstr, SqlConn)

facDataAdapter.SelectCommand = SqlComm

Dim dt As DataTable = New DataTable

facDataAdapter.Fill(dt)

Return dt

End Function

End Module