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PRB: Executing Refresh Method of ADO Data Control Causes Syntax and Method Refresh Errors


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Symptoms

When you set the RecordSource property of an ADO Data Control to a different SQL SELECT statement and then try to execute the Refresh method, the following error is returned:
Syntax error in FROM clause.
which is followed by:
Run-time error '-2147217900(80040e14)':
Method 'Refresh' of object 'IAdodc' failed
or:
Method 'Refresh' of object 'IAdodc' failed when attempting to refresh an ADODC after setting the recordsource property to another value.
The errors occur if the CommandType property of the ADO Data Control is set to adCmdTable.

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Cause

When the CommandType of the ADO Data Control is set to adCmdTable, "SELECT * From" is automatically prepended to the RecordSource value.

Setting the RecordSource to a table name results in a valid SQL statement, such as SELECT * FROM Tablename.

Setting the RecordSource to a SQL SELECT statement, such as Select * From Tablename, results in a SQL statement of Select * From Select * From Tablename, which is an invalid SQL statement.

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Resolution

There are several possible workarounds:
  1. Use a table name instead of a SQL SELECT statement for the RecordSource property, so that SELECT * FROM Tablename is generated
  2. At design time, use a CommandType value of adCmdUnknown. You could then use a table name at design time, and a SQL SELECT statement at run time
  3. At run time, explicitly specify a CommandType of adCmdText or adCmdUnknown, so that SELECT * FROM is not automatically prepended.
  4. Certain providers accept SELECT * FROM (SELECT * FROM Tablename) as a valid SELECT statement, so you could try enclosing the SQL SELECT in parentheses. For example, the Jet OLE DB Provider 4.0 accepts this syntax.

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More information

Steps to Reproduce Behavior

  1. In Microsoft Visual Basic 6.0, create a new Standard EXE project. Form1 is created by default.
  2. From the Project menu, choose Components, and select Microsoft ADO Data Control 6.0 (OLEDB).
  3. Place an ADO Data Control and a CommandButton onto Form1.
  4. Set the ConnectionString property of the ADO Data Control to use the Nwind.MDB that comes with Visual Basic.
  5. Set the RecordSource property to the Customers table. Confirm that the CommandType is type 2 - adCmdTable.
  6. Add the following code to the click event for the CommandButton:
    ' Adodc1.CommandType = adCmdText
    Adodc1.RecordSource = "Select * from Employees"
    Adodc1.Refresh
    					
  7. Press the F5 key to execute the code. Click on the CommandButton, and note that the errors are returned on the ADODC1.Refresh line of code. Return to design mode.
  8. Uncomment the line that explicitly sets the ADO Data Control'sCommandType to adCmdUnknown. Press the F5 key to execute the code, and note that no error is returned.

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Keywords: KB238279, kbprb, kbdatabase

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Article Info
Article ID : 238279
Revision : 3
Created on : 5/8/2003
Published on : 5/8/2003
Exists online : False
Views : 442