1. A synchronization method for a database transformation, which is applied to a data adapter and a database transformer, the data adapter comprising a synchronization control unit, a storage unit and a statement parsing unit, the database transformer transforming tables from a source database into a target database, and the synchronization method comprising: using the synchronization control unit to determine a query mechanism; using the statement parsing unit to receive a database query statement and to parse a query table related to the database query statement; returning a transformation status of the query table to the synchronization control unit by the database transformer, wherein the transformation status comprises a blocking stage, a transforming stage or a completing stage; and using the synchronization control unit to perform the database query statement in the source database, the target database or both of them in accordance with the query mechanism and the transformation status.