ACC2000: By Default, New Access Databases Do Not Include Reference to Microsoft DAO Object Library

ID: Q225962

The information in this article applies to:

Microsoft Access 2000

Moderate: Requires basic macro, coding, and interoperability skills.

This article applies only to a Microsoft Access database (.mdb).

SYMPTOMS

By default, a new Microsoft Access 2000 database does not reference the Microsoft DAO 3.6 Object Library. This is a change from earlier versions of Access.

If you run Visual Basic for Applications code that uses the Data Access Object (DAO) library in a new Access 2000 database, you receive an error message similar to the following:

Compile error:
User-defined type not defined.

-or-

Run-time error '424':
Object required.

RESOLUTION

Developers who want to use the Data Access Object (DAO) library instead of, or in addition to, the new Microsoft ActiveX Data Object (ADO) model, must manually set the reference in each new database.

MORE INFORMATION

Microsoft DAO 3.6 and ADO 2.1 have several object names in common, such as Database and Recordset. If you reference both DAO 3.6 and ADO 2.1, and you do not specify which library you are using to declare an object, your code may cause an error or not run as expected. To specifically declare an object in a library, use the prefix for the library. For example, the following lines declare a variable as a database:

Using DAO 3.6


Dim MyDB as DAO.Database

Using ADO 2.1


Dim MyDB as ADODB.Database

By always using a prefix to define which library your objects are being declared in, you can eliminate possible errors caused by objects being declared from the wrong library. Using the prefix also makes your code easier to read.

Converted databases automatically update the Microsoft DAO 3.x reference to Microsoft DAO 3.6.

To manually include the reference to the DAO 3.6 Object library, follow these steps:

Open a new Access 2000 database.

Click Modules under Objects, and then click New.

In the Visual Basic Editor, click References on the Tools menu.

Scroll through the list until you find the Microsoft DAO 3.6 Object Library, and click to select the reference.

Click OK.

On the File menu, click Close and Return to Microsoft Access.

REFERENCES

For more information about the new Microsoft ActiveX Data Object (ADO) model, in the Visual Basic Editor, click Microsoft Visual Basic Help on the Help menu, type using ActiveX Data Objects in the Office Assistant or the Answer Wizard, and then click Search to view the topic.

Additional query words: prb

Keywords : kbdta CnvVerDif MdlVb MdlDao MdlLib
Version : WINDOWS:2000
Platform : WINDOWS
Issue type : kbprb