Symptoms
When you compile your ADO project, you receive the following error:
Compile error: User-defined type not defined
This can occur on either a Connection or Command object.
Cause
You may have referenced one of the following libraries instead of the Microsoft ActiveX Data Objects (ADODB) type library:
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Microsoft ActiveX Data Objects Recordset (ADOR) type library.-or-
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Microsoft ActiveX Data Objects (Multi-dimensional) (ADOMD) type library.
Resolution
Remove the incorrect type library reference from your project, and add a reference to the correct type library.
Status
This behavior is by design.
More Information
Steps to Reproduce Behavior
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Create a new project and add a command button (Command1) to a form.
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Add a reference to the Microsoft ActiveX Data Objects Recordset Library.
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Add the following code to the form:
Private Sub Command1_Click() Dim cn As ADODB.Connection End Sub
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Run the project and click the command button. The error appears.
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Remove the reference, and add a reference to the Microsoft ActiveX Data Objects Library.
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Click the command button. The error does not appear.
NOTE:
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Microsoft Access users will have to use ADODB.Connection to avoid confusion with the DAO Connection object.
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If the Intellitype feature is turned on, you should notice that it does not show Connection as a valid object with the ADOR type library, but does with the ADODB type library. This is a good indication that you do not have the correct type library referenced.
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This error can also occur when referencing objects in other type libraries that aren't referenced.
