Question

Access Update SQL not working in VB.NET OleDbCommand

Asked by: TongZ

Dear all,
     
     The update sql command below works fine from within Access, but failed when called through an OleDbCommand instance:

    UPDATE dat SET MONTH = Null WHERE MONTH Is Not Null

    Some info:
        The connection is opened without problem and other single record update is successfully done through this connection

        In the 'dat' table, the MONTH column has some Null (empty) and some zero, the intent is to set all to empty or Null for this field. This MONTH column has no constraint on it whatsoever, it is numeric.

    OleDbCommand complains about Update Syntax Error. The code snippet is attached.
    As a matter of fact, just for grin, the OleDbCommand failed on the following update as well:

    UPDATE dat SET MONTH = 0 WHERE MONTH = 0

    Please help,
    T

Dim lDbFileName As String = "C:\myDB.mdb"        
        Dim CnInput As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & lDbFileName)
        CnInput.Open()
 
        Dim lSQL As String = "UPDATE dat SET MONTH = Null WHERE MONTH Is Not Null"
        Dim lUpdateCommand As OleDbCommand = New OleDbCommand(lSQL, CnInput)
        lUpdateCommand.CommandTimeout = 30
        lUpdateCommand.ExecuteNonQuery()

                                  
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Asked On
2009-08-12 at 08:59:49ID24646956
Tags

Access

,

SQL

,

VB.NET 2008 Express Ed

Topics

VB Database Programming

,

SQL Query Syntax

,

Microsoft Access Database

Participating Experts
1
Points
70
Comments
6

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Answers

 

by: YZlatPosted on 2009-08-12 at 09:07:05ID: 25080106

did you try running this query directly in access?

 

by: YZlatPosted on 2009-08-12 at 09:10:05ID: 25080133

is MONTH column of type Number?

 

by: TongZPosted on 2009-08-12 at 09:26:56ID: 25080281

YZlat,
    Yes, the query works from within Access.
    Yes, MONTH column is Number.
    T

 

by: YZlatPosted on 2009-08-12 at 10:56:18ID: 25081081

try getting exact error by using try catch block:
Dim lDbFileName As String = "C:\myDB.mdb"        
        Dim CnInput As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & lDbFileName)
      Dim lSQL As String
      Dim lUpdateCommand As OleDbCommand
      Try
              CnInput.Open()
 
              lSQL = "UPDATE dat SET MONTH = Null WHERE MONTH Is Not Null"
              lUpdateCommand = New OleDbCommand(lSQL, CnInput)
              lUpdateCommand.CommandTimeout = 30
              lUpdateCommand.ExecuteNonQuery()
      Catch ex as Exception
            MessageBox.Show(ex.Message)
      End Try

 

by: YZlatPosted on 2009-08-12 at 10:58:10ID: 25081100

also try changing your query to

"UPDATE dat SET [MONTH] = Null WHERE [MONTH] Is Not Null"

in case MONTH is a reserved word

 

by: TongZPosted on 2009-08-12 at 14:30:45ID: 31614876

In conclusion, putting [] around the YEAR, MONTH, DAY column made the update SQL statement work through OleDbCommand. It seems when within Access, the brackets are optional, but they are required when done through OleDb connection.

20120131-EE-VQP-002

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