ADO error on NOT NULL date or datetime columns

With ADO and VB6, when selecting data from a table containing a DATE or
DATETIME column defined as NOT NULL, data retrieval stops with error
80004005, 'Data provider or other service returned an E_FAIL status',
apparently at the first row containing '0000-00-00' or '0000-00-00 00:00:00'
values (on DATE or DATETIME fields, respectively).
When the columns are defined as accepting NULL values, no error occurs when
values '0000-00-00' or '0000-00-00 00:00:00' are fetched.
The problem seems to be related with the use of ADO. It never happened while
using RDO.

Servers:
Windows ME, Windows 2000 Pro, Windows Server 2003
MySQL 4.1.09, MySQL 4.1.10, MySQL 4.1.11

Client:
Windows ME
VB6 SP6
MyODBC 3.51.11-1, MyODBC 3.51.11-2
MDAC 2.5 up to 2.8

Sample code:
Set oadoConnection = New ADODB.Connection
With oadoConnection
.CursorLocation = adUseClient
.ConnectionString = "DSN=TestDSN"
.Open
End With
Set oadoRs = New ADODB.Recordset
With oadoRs
.Open "select * from TESTTABLE;", oadoConnection
.Close
End With
Set oadoRs = Nothing



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