The Query method is available for the DAVAdapter object but, because the DAVAdapter object is available for submitting data only, the method will always generate a run-time error when it is called on that object.
expression.Query()
expression Required. An expression that returns a reference to the DAVAdapter object.
Security Level
2: Can be accessed only by forms running in the same domain as the currently open form, or by forms that have been granted cross-domain permissions.
Remarks
Note This object model member is not supported when the Disable Service Pack features option on the Advanced tab of the Options dialog box in InfoPath is selected or when Microsoft Office 2003 Service Pack 1 or later is not installed. Any form that implements this object model member in its code will generate an error message if it is opened in InfoPath when service pack features are disabled or unavailable.