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database connectivity in vb.net

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sheelap
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5 posts since Feb 2011
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anyone tell me a detail of database connectivity in vb.net with sql server and oracle.i already tried it on my laptop.but it shows errors.1 year back i successfully did the connectivity.but now i forgotton how it do?even i could not able to coonect ms-access with vb.it always shows error.any one tell me the basic details to advanced details step by step for this connectivity.for all 1.ms-access
2.SQL Server
3.oracle
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saleem.mukhtiar
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you can connect through wizrad using data set and data source data navigation from Data sub options in tool panel
.
or
through code
..
ist import the namesapces
.
for sql

import system.data.sqlclient

DATA connection

dim dt as new sqlConnection = ("data source=.; integrated security= true; database name= DATA BASE")
dt.open()
.
then desired action
SqlDataAddaptor, SqlCommand, or DataReader
.
Hope its help full for you

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poojavb
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524 posts since Nov 2011
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I have done the connection but by providing modules...check if it helps u...

  1. for ms access

    Imports System.Data.OleDb
    
    Module DBConnection
    
    Public Connection As OleDbConnection = New OleDbConnection()
    Public Function Open_DB_Connection() As String
        Try
            Dim EntireFile As String = Application.StartupPath & "\HMS.mdb"
    
            Connection.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0.; " & "Data Source=" & EntireFile
            Connection.Open()
            Return "Success"
        Catch ex As Exception
            Debug.Print(ex.Message & "in DBConnection_Module")
            Return "Fail"
            Exit Function
        End Try
    End Function
    
    Public Function Close_DB_Connection() As String
        Try
            Connection.Close()
            Return "Success"
        Catch ex As Exception
            Debug.Print(ex.Message & "in DBConnection_Module")
            Return "Fail"
            Exit Function
        End Try
    End Function
    
    End Module
    
  2. SQL server

    Imports System.Data.SqlClient
    
    Module DBConnection
    
    Public Connection As SqlConnection = New SqlConnection()
    Public Function Open_DB_Connection() As String
        Try
            Connection.ConnectionString = "Server=.\SQLEXPRESS;" & _
                    "Database=HMS;Trusted_Connection=True"
            Connection.Open()
            Return "Success"
        Catch ex As Exception
            Debug.Print(ex.Message & "in DBConnection_Module")
            Return "Fail"
            Exit Function
        End Try
    End Function
    
    Public Function Close_DB_Connection() As String
        Try
            Connection.Close()
            Return "Success"
        Catch ex As Exception
            Debug.Print(ex.Message & "in DBConnection_Module")
            Return "Fail"
            Exit Function
        End Try
    End Function
    
    End Module
    
  3. I am not sure for Oracle...

Create the module once and when we need to call the open connection just call the function and same for close connection

 Dim Open_DB_Con As String
 Open_DB_Con = Open_DB_Connection()


 Dim Close_DB_Con As String
 Close_DB_Con = Close_DB_Connection()

I know its too long but still worthy....

u can also give success msg if the connection suceeds and also a failure message if it fails after the function is called....

like

    If Open_DB_Con = "Success" Then
         Debug.Print("Database connection sucessfull in frmAppointment Appointment Date Change Event")
    ElseIf Open_DB_Con = "Fail" Then
         Debug.Print("Could not establish DataBase connection! ")
    End If



    If Close_DB_Con = "Success" Then
        Debug.Print("Database connection closed in frmAppointment Validate Registration Event")
    ElseIf Close_DB_Con = "Fail" Then
        Debug.Print("Could not close DataBase connection! ")
    End If

Note: Creating module helps in repeating the same connection string again and again...just calling the function helps....

You
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