PRB: DAO Recordset Name Property Is Limited to 256 Characters

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, versions 5.0, 6.0
• Microsoft Visual Basic Standard, Professional, and Enterprise Editions, 16-bit and 32-bit, for Windows, version 4.0

SYMPTOMS

The Name property of a DAO Recordset object is limited to 256 characters. It only reports the first 256 characters of the SQL statement used to create the new Recordset. If the SQL statement is longer than 256 characters, and you refresh the Data Control in the code later on, you will receive one of the following errors:

"Run-time error '3061': Too few parameters. Expected 1"

"Run-time error '3075': Syntax error in string in query expression 'xxxx'"

CAUSE

When you set the Data Control's Recordset property to an existing Recordset, it obtains its RecordSource property from the DAO Recordset's Name property, which allows a maximum length of 256 characters.

RESOLUTION

Store the SQL statement into a string variable. Before refreshing the Data Control, set its RecordSource Property to this variable. For example:

   Data1.RecordSource = SQLStr
   Data1.Refresh 

STATUS

This behavior is by design.

MORE INFORMATION

Steps to Reproduce Behavior

1. Start a new project in Visual Basic. Form1 is created by default.



2. Add a Data Control(Data1) and a CommandButton (Command1) to Form1.



3. In the Click event of Command1, place the following code:

   
         Private Sub Command1_Click()
           Dim DB As Database, RS As Recordset
           Dim SQLStr As String
   
           Set DB = DBEngine.Workspaces(0).OpenDatabase("Biblio.MDB")
   
           'This SQL Statement causes Run-time error 3075.
           SQLStr = "Select PubID, Name, [Company Name], Address, " _
            & "City, State, PubID, Name, [Company Name], Address, City, " _
            & "State, PubID, Name, [Company Name], Address, City, State, " _
            & "PubID, Name, [Company Name], Address, City, State " _
            & "from Publishers Where PubID = 2 and State = 'MA'"
   
           'This SQL Statement causes Run-time error 3061.
           'SQLStr = "Select PubID, Name, [Company Name], Address, City, " _
           ' & "State, PubID, Name, [Company Name], Address, City, State, " _
           ' & "PubID, Name, [Company Name], Address, City, State, " _
           ' & "PubID, Name, [Company Name], Address, City, State, " _
           ' & "PubID from Publishers Where PubID = 2 and State = 'MA'"
   
           Set RS = DB.OpenRecordset(SQLStr, dbOpenDynaset)
           Set Data1.Recordset = RS
           Debug.Print RS.Name
           Debug.Print Data1.RecordSource
           Data1.Refresh
   
         End Sub 




4. Start the program by pressing the F5 key.



5. Click the Command1 button to execute the code and note that you receive one of the above errors.

Additional query words: kbVBp500 kbVBp600 kbdse kbDSupport kbVBp kbVBp400 kbDAO

Keywords : kbGrpVBDB
Version :
Platform : WINDOWS
Issue type :