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This event takes place just before ddl_command_end, and is fired if and only if at least one object has been dropped by the command. (For instance, DROP TABLE IF EXISTS of a table that does not in fact exist will not lead to such a trigger firing). Commands that drop multiple objects (such as DROP SCHEMA or DROP OWNED BY) will cause a single event to fire. Some firings might be surprising, such as ALTER TABLE DROP COLUMN. The trigger is fired after the drop has taken place, because that has been deemed the safest design, to avoid exposing possibly-inconsistent internal state (system catalogs as well as current transaction) to the user function code. This means that careful tracking of object identification is required during the object removal phase. Like other currently existing events, there is support for tag filtering. To support the new event, add a new pg_event_trigger_dropped_objects() set-returning function, which returns a set of rows comprising the objects affected by the command. This is to be used within the user function code, and is mostly modelled after the recently introduced pg_identify_object() function. Catalog version bumped due to the new function. Dimitri Fontaine and Álvaro Herrera Review by Robert Haas, Tom Lane |
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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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.