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This is infrastructure for the complete SQL standard feature. No support is included at this point for execution nodes or PLs. The intent is to add that soon. As this patch leaves things, standard syntax can create tuplestores to contain old and/or new versions of rows affected by a statement. References to these tuplestores are in the TriggerData structure. C triggers can access the tuplestores directly, so they are usable, but they cannot yet be referenced within a SQL statement.
80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* reltrigger.h
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* POSTGRES relation trigger definitions.
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*
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*
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* Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/utils/reltrigger.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef RELTRIGGER_H
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#define RELTRIGGER_H
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/*
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* These struct really belongs to trigger.h, but we put it separately so that
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* it can be cleanly included in rel.h and other places.
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*/
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typedef struct Trigger
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{
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Oid tgoid; /* OID of trigger (pg_trigger row) */
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/* Remaining fields are copied from pg_trigger, see pg_trigger.h */
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char *tgname;
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Oid tgfoid;
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int16 tgtype;
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char tgenabled;
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bool tgisinternal;
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Oid tgconstrrelid;
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Oid tgconstrindid;
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Oid tgconstraint;
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bool tgdeferrable;
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bool tginitdeferred;
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int16 tgnargs;
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int16 tgnattr;
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int16 *tgattr;
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char **tgargs;
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char *tgqual;
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char *tgoldtable;
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char *tgnewtable;
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} Trigger;
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typedef struct TriggerDesc
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{
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Trigger *triggers; /* array of Trigger structs */
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int numtriggers; /* number of array entries */
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/*
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* These flags indicate whether the array contains at least one of each
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* type of trigger. We use these to skip searching the array if not.
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*/
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bool trig_insert_before_row;
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bool trig_insert_after_row;
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bool trig_insert_instead_row;
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bool trig_insert_before_statement;
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bool trig_insert_after_statement;
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bool trig_update_before_row;
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bool trig_update_after_row;
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bool trig_update_instead_row;
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bool trig_update_before_statement;
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bool trig_update_after_statement;
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bool trig_delete_before_row;
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bool trig_delete_after_row;
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bool trig_delete_instead_row;
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bool trig_delete_before_statement;
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bool trig_delete_after_statement;
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/* there are no row-level truncate triggers */
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bool trig_truncate_before_statement;
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bool trig_truncate_after_statement;
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/* Is there at least one trigger specifying each transition relation? */
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bool trig_insert_new_table;
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bool trig_update_old_table;
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bool trig_update_new_table;
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bool trig_delete_old_table;
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} TriggerDesc;
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#endif /* RELTRIGGER_H */
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