[Gnumed-devel] gmPG.run_commit() convenience change

[Karsten Hilbert]

if return_err_msg is true it will now return the database level
error message on failing queries, default false such that
existing run_commit() calls need not be revisited

thus we can at least crudely inform the user on why a query
(say, an insert) failed in the face of absence of explicit
validation code (we'll get an error message re some sort of
integrity violation listing fields, tables and values,
occasionally even localized, depending on the PostgreSQL
version)

Karsten
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