Changes between Version 20 and Version 21 of NonSqlBackends


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Timestamp:
08/28/2009 02:51:47 AM (6 years ago)
Author:
wkornewald
Comment:

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  • NonSqlBackends

    v20 v21  
    77
    88Specific backend specifications: AppEngine, [wiki:SimpleDB]
     9
     10= Basics =
    911
    1012Database query operations (get, count, ... entities) are provided to Django models via managers. Managers basically wrap around QuerySet methods. Internally Django's QuerySet class uses sql.Query whose default is sql.BaseQuery. sql.Query can be overridden to use a custom Query class (the backend). So we end up writting a Query class in order to provide a specific backend. So anything done in Django's Model methods or QuerySet methods which cannot be done for a specific backend should be moved into the Query in order to allow backends to specify what to do in such cases.
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