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e3161b231c
Often, upon getting an unexpected error in psql, one's first wish is that the verbosity setting had been higher; for example, to be able to see the schema-name field or the server code location info. Up to now the only way has been to adjust the VERBOSITY variable and repeat the failing query. That's a pain, and it doesn't work if the error isn't reproducible. This commit adds support in libpq for regenerating the error message for an existing error PGresult at any desired verbosity level. This is almost just a matter of refactoring the existing code into a subroutine, but there is one bit of possibly-needed information that was not getting put into PGresults: the text of the last query sent to the server. We must add that string to the contents of an error PGresult. But we only need to save it if it might be used, which with the existing error-formatting code only happens if there is a PG_DIAG_STATEMENT_POSITION error field, which is probably pretty rare for errors in production situations. So really the overhead when the feature isn't used should be negligible. Alex Shulgin, reviewed by Daniel Vérité, some improvements by me |
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