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In C API, do prepared statements of simple inserts execute repeatedly even if not reset?
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Note that neither an explicit nor automatic reset clears any bindings that you have made against the statement as these are not part of the "execution state" but are a separate construct associated with the statement itself (though there is a call to reset the bindings (sqlite3_clear_bindings) which will clear the bindings data associated with a statement context).

It is not necessary to re-bind unchanged bindings to a statement context as this data is not modified by the execution state of the statement itself.

sqlite3_finalize operates on a statement context and does a reset, clears the bindings, then free's the various memory structures associated with a statement and destroys the statement context.