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As currently implemented, failure of a PGEVT_RESULTCREATE callback causes the PGresult to be converted to an error result. This is intellectually inconsistent (shouldn't a failing callback likewise prevent creation of the error result? what about side-effects on the behavior seen by other event procs? why does PQfireResultCreateEvents act differently from PQgetResult?), but more importantly it destroys any promises we might wish to make about the behavior of libpq in nontrivial operating modes, such as pipeline mode. For example, it's not possible to promise that PGRES_PIPELINE_SYNC results will be returned if an event callback fails on those. With this definition, expecting applications to behave sanely in the face of possibly-failing callbacks seems like a very big lift. Hence, redefine the result of a callback failure as being simply that that event procedure won't be called any more for this PGresult (which was true already). Event procedures can still signal failure back to the application through out-of-band mechanisms, for example via their passthrough arguments. Similarly, don't let failure of a PGEVT_RESULTCOPY callback prevent PQcopyResult from succeeding. That definition allowed a misbehaving event proc to break single-row mode (our sole internal use of PQcopyResult), and it probably had equally deleterious effects for outside uses. Discussion: https://postgr.es/m/3185105.1644960083@sss.pgh.pa.us |
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.