The information in this article applies to:
- Microsoft Access versions 1.0, 1.1, 2.0, 7.0, 97
SYMPTOMS
Moderate: Requires basic macro, coding, and interoperability skills.
The RecordCount property, when used with a recordset or snapshot, returns
a recordset containing an incorrect number of records.
This article assumes that you are familiar with Visual Basic for
Applications and with creating Microsoft Access applications using the
programming tools provided with Microsoft Access. For more information
about Visual Basic for Applications, please refer to your version of the
"Building Applications with Microsoft Access" manual.
NOTE: Visual Basic for Applications is called Access Basic in Microsoft
Access versions 1.x and 2.0. For more information about Access Basic,
please refer to the "Introduction to Programming" manual in Microsoft
Access version 1.x or the "Building Applications" manual in Microsoft
Access version 2.0.
CAUSE
For recordsets and snapshots, Microsoft Access does not automatically
return the number of records that exist in the recordset. It returns
the number of records accessed.
RESOLUTION
To determine the exact number of records in a dynaset or snapshot, use
the MoveLast method before checking the RecordCount property.
STATUS
This behavior is by design.
MORE INFORMATION
The following Visual Basic function, MyWrongRecordCount(), returns the
number 1 for the Customers table in the sample database Northwind.mdb (or
NWIND.MDB in versions 1.x and 2.0) because only one record has been
accessed. The MyRightRecordCount() function uses the MoveLast method first
to access all records in the dynaset and then to return the RecordCount
value.
Steps to Reproduce Behavior
- Open the sample database Northwind.mdb (or NWIND.MDB in versions 1.x
and 2.0).
- Create a module and type the following line in the Declarations
section:
Option Explicit
- Type the following procedures:
In Microsoft Access 7.0 and 97:
'===========================================================
' The following function, MyWrongRecordCount(), demonstrates
' the incorrect way to use the RecordCount property to count
' records in a dynaset.
'===========================================================
Function MyWrongRecordCount ()
Dim MyDB As Database
Dim MyRS as Recordset
Set MyDB = CurrentDB()
Set MyRS = MyDb.OpenRecordset("Customers", dbOpenDynaset)
MyWrongRecordCount = MyRS.RecordCount
MyRS.Close
End Function
'===========================================================
' The following function, MyRightRecordCount(), demonstrates
' the correct way to use the RecordCount property to count
' records in a dynaset.
'===========================================================
Function MyRightRecordCount ()
Dim MyDB As Database
Dim MyRS as Recordset
Set MyDB = CurrentDB()
Set MyRS = MyDb.OpenRecordset("Customers", dbOpenDynaset)
MyRS.MoveLast
MyRightRecordCount = MyRS.RecordCount
MyRS.Close
End Function
In Microsoft Access 2.0:
'===========================================================
' The following function, MyWrongRecordCount(), demonstrates
' the incorrect way to use the RecordCount property to count
' records in a dynaset.
'===========================================================
Function MyWrongRecordCount ()
Dim MyDB As Database
Dim MyRS as Recordset
Set MyDB = CurrentDB()
Set MyRS = MyDb.OpenRecordset("Customers", DB_OPEN_DYNASET)
MyWrongRecordCount = MyRS.RecordCount
MyRS.Close
End Function
'===========================================================
' The following function, MyRightRecordCount(), demonstrates
' the correct way to use the RecordCount property to count
' records in a dynaset.
'===========================================================
Function MyRightRecordCount ()
Dim MyDB As Database
Dim MyRS as Recordset
Set MyDB = CurrentDB()
Set MyRS = MyDb.OpenRecordset("Customers", DB_OPEN_DYNASET)
MyRS.MoveLast
MyRightRecordCount = MyRS.RecordCount
MyRS.Close
End Function
In Microsoft Access 1.x:
'===========================================================
' The following function, MyWrongRecordCount(), demonstrates
' the incorrect way to use the RecordCount property to count
' records in a dynaset.
'===========================================================
Function MyWrongRecordCount ()
Dim MyDB As Database
Dim MyRS as Dynaset
Set MyDB = CurrentDB()
Set MyRS = MyDb.CreateDynaset("Customers")
MyWrongRecordCount = MyRS.RecordCount
MyRS.Close
End Function
'===========================================================
' The following function, MyRightRecordCount(), demonstrates
' the correct way to use the RecordCount property to count
' records in a dynaset.
'===========================================================
Function MyRightRecordCount ()
Dim MyDB As Database
Dim MyRS as Dynaset
Set MyDB = CurrentDB()
Set MyRS = MyDb.CreateDynaset("Customers")
MyRS.MoveLast
MyRightRecordCount = MyRS.RecordCount
MyRS.Close
End Function
- To test these functions, type the following lines in the Debug window
(or Immediate window in versions 1.x and 2.0), and then press ENTER.
?MyWrongRecordCount()
Note that the function returns 1.
?MyRightRecordCount()
Note that the function returns the correct number of records in the
Customers table.
REFERENCES
For more information about RecordCount Property, search the Help Index for
"RecordCount Property," or ask the Microsoft Access 97 Office Assistant.