Question

Check if Access table exists from VB.NET

Asked by: jes12345

I guess the title says it all - what is the best way to check if an access table exists from VB.NET. If it exists I will do nothing but if it doesn't then I will need to create the table.

Thanks

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Asked On
2009-09-29 at 03:52:14ID24769569
Topics

Visual Basic Programming

,

Microsoft Access Database

,

.NET

Participating Experts
2
Points
500
Comments
11

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Answers

 

by: spprivatePosted on 2009-09-29 at 04:32:18ID: 25447730

Here is a VB Code from  
http://forums.devarticles.com/microsoft-access-development-49/access-2000-delete-a-table-if-it-exists-using-code-3821.html


CurrentDb.TableDefs(TableName)  is  the key

Function TableExists(TableName As String) As Boolean
'=================================================  ============================
' hlfUtils.TableExists
'-----------------------------------------------------------------------------
-------------------------------------------------
' Purpose:  Checks to see whether the named table exists in the database
'-----------------------------------------------------------------------------
' Parameters:
' ARGUEMENT             :   DESCRIPTION
'-----------------------------------------------------------------------------
' TableName (String)    :   Name of table to check for
'-----------------------------------------------------------------------------
' Returns:  True, if table found in current db, False if not found.
'=================================================  ============================
 
Dim strTableNameCheck
On Error GoTo ErrorCode
 
'try to assign tablename value
strTableNameCheck = CurrentDb.TableDefs(TableName)
 
'If no error and we get to this line, true
TableExists = True
 
ExitCode:
    On Error Resume Next
    Exit Function
 
ErrorCode:
    Select Case Err.number
        Case 3265  'Item not found in this collection
            TableExists = False
            Resume ExitCode
        Case Else
            MsgBox "Error " & Err.number & ": " & Err.Description, vbCritical, "hlfUtils.TableExists"
            'Debug.Print "Error " & Err.number & ": " & Err.Description & "hlfUtils.TableExists"
            Resume ExitCode
    End Select
 
End Function

                                              
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by: peter57rPosted on 2009-09-29 at 04:37:35ID: 25447779

There are many ways.
One would be to count the records returned by:
select [name] from msysobjects where type =1 and [name] = 'tablename'

Or just use try & catch and try to open it.

 

by: spprivatePosted on 2009-09-29 at 04:41:12ID: 25447800

Here is VB.Net code

 Dim AccessConnection As New System.Data.OleDb.OleDbConnection()
        Dim SchemaTable As DataTable
 
        AccessConnection.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
        "Data Source=C:\Projects\Ajax\db\Northwind.mdb"
        AccessConnection.Open()
 
        'Retrieve schema information about Table1.
        SchemaTable = AccessConnection.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Columns, _
New Object() {Nothing, Nothing, "Customers"})
 
        If SchemaTable.Rows.Count <> 0 Then
            MessageBox.Show("Exists")
        Else
            MessageBox.Show("Not Exists")
        End If
 
        AccessConnection.Close()
    End Sub

                                              
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by: jes12345Posted on 2009-09-29 at 06:09:40ID: 25448547

Some feedback -
spprivate - I did not get this to work.
peter57r - The sql does run but it doesn't return anything. Should I actually type [name] or should this be replaced by something? I guess the try/catch is my only other option.
spprivate-This probably will work but since it is a distributed app I cannot depend on OleDb driver being installed.

Thanks J

 

by: spprivatePosted on 2009-09-29 at 08:20:52ID: 25450049

I am not sure if I understood correctly.When you create a installer you are going to have all bundled in it.
What is the deal.Anyway to connect to the db you need to use one of the providers

 

by: peter57rPosted on 2009-09-30 at 02:03:18ID: 25456678

"peter57r - The sql does run but it doesn't return anything. Should I actually type [name] or should this be replaced by something"

[Name] is the correct fieldname to use.
If i do :

Select [Name] from msysobjects where [name] = 'customers' and type = 1

I get 1 record (Customers does exist)

 

by: jes12345Posted on 2009-09-30 at 05:45:03ID: 25458117

I get the same result if the table exists or not. Please see screenshot of watch:

 

by: peter57rPosted on 2009-09-30 at 05:52:48ID: 25458216

They look different to me.
One 'HasRows' and the other doesn't.

 

by: jes12345Posted on 2009-09-30 at 23:41:07ID: 25466387

I am sorry! - How could I overlook that?:o| I was so focused on fieldcount that I missed the difference..The good thing is that I have what I need now (and I understand it... :o)

Btw do you happen to know how to show the msysobjects table in Access 2003?

Thanks again!

 

by: peter57rPosted on 2009-10-01 at 11:07:35ID: 25471438

Tools>Options
Show System Objects.

 

by: jes12345Posted on 2009-10-04 at 23:46:29ID: 31634776

Thanks!

20120131-EE-VQP-002

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