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Diffstat (limited to 'src/include/commands/trigger.h')
| -rw-r--r-- | src/include/commands/trigger.h | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/src/include/commands/trigger.h b/src/include/commands/trigger.h new file mode 100644 index 0000000..40b8154 --- /dev/null +++ b/src/include/commands/trigger.h @@ -0,0 +1,282 @@ +/*------------------------------------------------------------------------- + * + * trigger.h + * Declarations for trigger handling. + * + * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group + * Portions Copyright (c) 1994, Regents of the University of California + * + * src/include/commands/trigger.h + * + *------------------------------------------------------------------------- + */ +#ifndef TRIGGER_H +#define TRIGGER_H + +#include "catalog/objectaddress.h" +#include "nodes/execnodes.h" +#include "nodes/parsenodes.h" + +/* + * TriggerData is the node type that is passed as fmgr "context" info + * when a function is called by the trigger manager. + */ + +#define CALLED_AS_TRIGGER(fcinfo) \ + ((fcinfo)->context != NULL && IsA((fcinfo)->context, TriggerData)) + +typedef uint32 TriggerEvent; + +typedef struct TriggerData +{ + NodeTag type; + TriggerEvent tg_event; + Relation tg_relation; + HeapTuple tg_trigtuple; + HeapTuple tg_newtuple; + Trigger *tg_trigger; + TupleTableSlot *tg_trigslot; + TupleTableSlot *tg_newslot; + Tuplestorestate *tg_oldtable; + Tuplestorestate *tg_newtable; + const Bitmapset *tg_updatedcols; +} TriggerData; + +/* + * The state for capturing old and new tuples into transition tables for a + * single ModifyTable node (or other operation source, e.g. copy.c). + * + * This is per-caller to avoid conflicts in setting tcs_map or + * tcs_original_insert_tuple. Note, however, that the pointed-to + * private data may be shared across multiple callers. + */ +struct AfterTriggersTableData; /* private in trigger.c */ + +typedef struct TransitionCaptureState +{ + /* + * Is there at least one trigger specifying each transition relation on + * the relation explicitly named in the DML statement or COPY command? + * Note: in current usage, these flags could be part of the private state, + * but it seems possibly useful to let callers see them. + */ + bool tcs_delete_old_table; + bool tcs_update_old_table; + bool tcs_update_new_table; + bool tcs_insert_new_table; + + /* + * For UPDATE and DELETE, AfterTriggerSaveEvent may need to convert the + * new and old tuples from a child table's format to the format of the + * relation named in a query so that it is compatible with the transition + * tuplestores. The caller must store the conversion map here if so. + */ + TupleConversionMap *tcs_map; + + /* + * For INSERT and COPY, it would be wasteful to convert tuples from child + * format to parent format after they have already been converted in the + * opposite direction during routing. In that case we bypass conversion + * and allow the inserting code (copy.c and nodeModifyTable.c) to provide + * a slot containing the original tuple directly. + */ + TupleTableSlot *tcs_original_insert_tuple; + + /* + * Private data including the tuplestore(s) into which to insert tuples. + */ + struct AfterTriggersTableData *tcs_private; +} TransitionCaptureState; + +/* + * TriggerEvent bit flags + * + * Note that we assume different event types (INSERT/DELETE/UPDATE/TRUNCATE) + * can't be OR'd together in a single TriggerEvent. This is unlike the + * situation for pg_trigger rows, so pg_trigger.tgtype uses a different + * representation! + */ +#define TRIGGER_EVENT_INSERT 0x00000000 +#define TRIGGER_EVENT_DELETE 0x00000001 +#define TRIGGER_EVENT_UPDATE 0x00000002 +#define TRIGGER_EVENT_TRUNCATE 0x00000003 +#define TRIGGER_EVENT_OPMASK 0x00000003 + +#define TRIGGER_EVENT_ROW 0x00000004 + +#define TRIGGER_EVENT_BEFORE 0x00000008 +#define TRIGGER_EVENT_AFTER 0x00000000 +#define TRIGGER_EVENT_INSTEAD 0x00000010 +#define TRIGGER_EVENT_TIMINGMASK 0x00000018 + +/* More TriggerEvent flags, used only within trigger.c */ + +#define AFTER_TRIGGER_DEFERRABLE 0x00000020 +#define AFTER_TRIGGER_INITDEFERRED 0x00000040 + +#define TRIGGER_FIRED_BY_INSERT(event) \ + (((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_INSERT) + +#define TRIGGER_FIRED_BY_DELETE(event) \ + (((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_DELETE) + +#define TRIGGER_FIRED_BY_UPDATE(event) \ + (((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_UPDATE) + +#define TRIGGER_FIRED_BY_TRUNCATE(event) \ + (((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_TRUNCATE) + +#define TRIGGER_FIRED_FOR_ROW(event) \ + ((event) & TRIGGER_EVENT_ROW) + +#define TRIGGER_FIRED_FOR_STATEMENT(event) \ + (!TRIGGER_FIRED_FOR_ROW(event)) + +#define TRIGGER_FIRED_BEFORE(event) \ + (((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_BEFORE) + +#define TRIGGER_FIRED_AFTER(event) \ + (((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_AFTER) + +#define TRIGGER_FIRED_INSTEAD(event) \ + (((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_INSTEAD) + +/* + * Definitions for replication role based firing. + */ +#define SESSION_REPLICATION_ROLE_ORIGIN 0 +#define SESSION_REPLICATION_ROLE_REPLICA 1 +#define SESSION_REPLICATION_ROLE_LOCAL 2 +extern PGDLLIMPORT int SessionReplicationRole; + +/* + * States at which a trigger can be fired. These are the + * possible values for pg_trigger.tgenabled. + */ +#define TRIGGER_FIRES_ON_ORIGIN 'O' +#define TRIGGER_FIRES_ALWAYS 'A' +#define TRIGGER_FIRES_ON_REPLICA 'R' +#define TRIGGER_DISABLED 'D' + +extern ObjectAddress CreateTrigger(CreateTrigStmt *stmt, const char *queryString, + Oid relOid, Oid refRelOid, Oid constraintOid, Oid indexOid, + Oid funcoid, Oid parentTriggerOid, Node *whenClause, + bool isInternal, bool in_partition); +extern ObjectAddress CreateTriggerFiringOn(CreateTrigStmt *stmt, const char *queryString, + Oid relOid, Oid refRelOid, Oid constraintOid, + Oid indexOid, Oid funcoid, Oid parentTriggerOid, + Node *whenClause, bool isInternal, bool in_partition, + char trigger_fires_when); + +extern void RemoveTriggerById(Oid trigOid); +extern Oid get_trigger_oid(Oid relid, const char *name, bool missing_ok); + +extern ObjectAddress renametrig(RenameStmt *stmt); + +extern void EnableDisableTrigger(Relation rel, const char *tgname, + char fires_when, bool skip_system, LOCKMODE lockmode); + +extern void RelationBuildTriggers(Relation relation); + +extern TriggerDesc *CopyTriggerDesc(TriggerDesc *trigdesc); + +extern const char *FindTriggerIncompatibleWithInheritance(TriggerDesc *trigdesc); + +extern TransitionCaptureState *MakeTransitionCaptureState(TriggerDesc *trigdesc, + Oid relid, CmdType cmdType); + +extern void FreeTriggerDesc(TriggerDesc *trigdesc); + +extern void ExecBSInsertTriggers(EState *estate, + ResultRelInfo *relinfo); +extern void ExecASInsertTriggers(EState *estate, + ResultRelInfo *relinfo, + TransitionCaptureState *transition_capture); +extern bool ExecBRInsertTriggers(EState *estate, + ResultRelInfo *relinfo, + TupleTableSlot *slot); +extern void ExecARInsertTriggers(EState *estate, + ResultRelInfo *relinfo, + TupleTableSlot *slot, + List *recheckIndexes, + TransitionCaptureState *transition_capture); +extern bool ExecIRInsertTriggers(EState *estate, + ResultRelInfo *relinfo, + TupleTableSlot *slot); +extern void ExecBSDeleteTriggers(EState *estate, + ResultRelInfo *relinfo); +extern void ExecASDeleteTriggers(EState *estate, + ResultRelInfo *relinfo, + TransitionCaptureState *transition_capture); +extern bool ExecBRDeleteTriggers(EState *estate, + EPQState *epqstate, + ResultRelInfo *relinfo, + ItemPointer tupleid, + HeapTuple fdw_trigtuple, + TupleTableSlot **epqslot); +extern void ExecARDeleteTriggers(EState *estate, + ResultRelInfo *relinfo, + ItemPointer tupleid, + HeapTuple fdw_trigtuple, + TransitionCaptureState *transition_capture); +extern bool ExecIRDeleteTriggers(EState *estate, + ResultRelInfo *relinfo, + HeapTuple trigtuple); +extern void ExecBSUpdateTriggers(EState *estate, + ResultRelInfo *relinfo); +extern void ExecASUpdateTriggers(EState *estate, + ResultRelInfo *relinfo, + TransitionCaptureState *transition_capture); +extern bool ExecBRUpdateTriggers(EState *estate, + EPQState *epqstate, + ResultRelInfo *relinfo, + ItemPointer tupleid, + HeapTuple fdw_trigtuple, + TupleTableSlot *slot); +extern void ExecARUpdateTriggers(EState *estate, + ResultRelInfo *relinfo, + ItemPointer tupleid, + HeapTuple fdw_trigtuple, + TupleTableSlot *slot, + List *recheckIndexes, + TransitionCaptureState *transition_capture); +extern bool ExecIRUpdateTriggers(EState *estate, + ResultRelInfo *relinfo, + HeapTuple trigtuple, + TupleTableSlot *slot); +extern void ExecBSTruncateTriggers(EState *estate, + ResultRelInfo *relinfo); +extern void ExecASTruncateTriggers(EState *estate, + ResultRelInfo *relinfo); + +extern void AfterTriggerBeginXact(void); +extern void AfterTriggerBeginQuery(void); +extern void AfterTriggerEndQuery(EState *estate); +extern void AfterTriggerFireDeferred(void); +extern void AfterTriggerEndXact(bool isCommit); +extern void AfterTriggerBeginSubXact(void); +extern void AfterTriggerEndSubXact(bool isCommit); +extern void AfterTriggerSetState(ConstraintsSetStmt *stmt); +extern bool AfterTriggerPendingOnRel(Oid relid); + + +/* + * in utils/adt/ri_triggers.c + */ +extern bool RI_FKey_pk_upd_check_required(Trigger *trigger, Relation pk_rel, + TupleTableSlot *old_slot, TupleTableSlot *new_slot); +extern bool RI_FKey_fk_upd_check_required(Trigger *trigger, Relation fk_rel, + TupleTableSlot *old_slot, TupleTableSlot *new_slot); +extern bool RI_Initial_Check(Trigger *trigger, + Relation fk_rel, Relation pk_rel); +extern void RI_PartitionRemove_Check(Trigger *trigger, Relation fk_rel, + Relation pk_rel); + +/* result values for RI_FKey_trigger_type: */ +#define RI_TRIGGER_PK 1 /* is a trigger on the PK relation */ +#define RI_TRIGGER_FK 2 /* is a trigger on the FK relation */ +#define RI_TRIGGER_NONE 0 /* is not an RI trigger function */ + +extern int RI_FKey_trigger_type(Oid tgfoid); + +#endif /* TRIGGER_H */ |