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Base classes for all backed-end plugins.
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Base class for all backend plugins.
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Base class for backend plugins that create connections.
In addition to the nicety of providing a standard connection API, all
backend plugins that create connections should use this base class so that
`request.destroy_context()` can properly close all open connections.
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Create thread-local connection.
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Return ``True`` if thread-local connection on `request.context` exists.
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Return thread-local connection.
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