ObjectGears

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Can I use in an ObjectGears query a table directly from the database (DataRowXXX)?

Yes, you can use directly also table name from the database in an ObjectGears query. There is the disadvantage that the query will not be easily transferable to another ObjectGears instance, because the class may have another ID there. So, you can have issues when moving the query from the development instance to the test and production.
Using DataRow table names is not a recommended approach.