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trigger.h
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1 /*-------------------------------------------------------------------------
2  *
3  * trigger.h
4  * Declarations for trigger handling.
5  *
6  * Portions Copyright (c) 1996-2017, PostgreSQL Global Development Group
7  * Portions Copyright (c) 1994, Regents of the University of California
8  *
9  * src/include/commands/trigger.h
10  *
11  *-------------------------------------------------------------------------
12  */
13 #ifndef TRIGGER_H
14 #define TRIGGER_H
15 
16 #include "catalog/objectaddress.h"
17 #include "nodes/execnodes.h"
18 #include "nodes/parsenodes.h"
19 
20 /*
21  * TriggerData is the node type that is passed as fmgr "context" info
22  * when a function is called by the trigger manager.
23  */
24 
25 #define CALLED_AS_TRIGGER(fcinfo) \
26  ((fcinfo)->context != NULL && IsA((fcinfo)->context, TriggerData))
27 
29 
30 typedef struct TriggerData
31 {
42 } TriggerData;
43 
44 /*
45  * The state for capturing old and new tuples into transition tables for a
46  * single ModifyTable node (or other operation source, e.g. copy.c).
47  *
48  * This is per-caller to avoid conflicts in setting tcs_map or
49  * tcs_original_insert_tuple. Note, however, that the pointed-to
50  * private data may be shared across multiple callers.
51  */
52 struct AfterTriggersTableData; /* private in trigger.c */
53 
54 typedef struct TransitionCaptureState
55 {
56  /*
57  * Is there at least one trigger specifying each transition relation on
58  * the relation explicitly named in the DML statement or COPY command?
59  * Note: in current usage, these flags could be part of the private state,
60  * but it seems possibly useful to let callers see them.
61  */
66 
67  /*
68  * For UPDATE and DELETE, AfterTriggerSaveEvent may need to convert the
69  * new and old tuples from a child table's format to the format of the
70  * relation named in a query so that it is compatible with the transition
71  * tuplestores. The caller must store the conversion map here if so.
72  */
74 
75  /*
76  * For INSERT and COPY, it would be wasteful to convert tuples from child
77  * format to parent format after they have already been converted in the
78  * opposite direction during routing. In that case we bypass conversion
79  * and allow the inserting code (copy.c and nodeModifyTable.c) to provide
80  * the original tuple directly.
81  */
83 
84  /*
85  * Private data including the tuplestore(s) into which to insert tuples.
86  */
89 
90 /*
91  * TriggerEvent bit flags
92  *
93  * Note that we assume different event types (INSERT/DELETE/UPDATE/TRUNCATE)
94  * can't be OR'd together in a single TriggerEvent. This is unlike the
95  * situation for pg_trigger rows, so pg_trigger.tgtype uses a different
96  * representation!
97  */
98 #define TRIGGER_EVENT_INSERT 0x00000000
99 #define TRIGGER_EVENT_DELETE 0x00000001
100 #define TRIGGER_EVENT_UPDATE 0x00000002
101 #define TRIGGER_EVENT_TRUNCATE 0x00000003
102 #define TRIGGER_EVENT_OPMASK 0x00000003
103 
104 #define TRIGGER_EVENT_ROW 0x00000004
105 
106 #define TRIGGER_EVENT_BEFORE 0x00000008
107 #define TRIGGER_EVENT_AFTER 0x00000000
108 #define TRIGGER_EVENT_INSTEAD 0x00000010
109 #define TRIGGER_EVENT_TIMINGMASK 0x00000018
110 
111 /* More TriggerEvent flags, used only within trigger.c */
112 
113 #define AFTER_TRIGGER_DEFERRABLE 0x00000020
114 #define AFTER_TRIGGER_INITDEFERRED 0x00000040
115 
116 #define TRIGGER_FIRED_BY_INSERT(event) \
117  (((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_INSERT)
118 
119 #define TRIGGER_FIRED_BY_DELETE(event) \
120  (((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_DELETE)
121 
122 #define TRIGGER_FIRED_BY_UPDATE(event) \
123  (((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_UPDATE)
124 
125 #define TRIGGER_FIRED_BY_TRUNCATE(event) \
126  (((event) & TRIGGER_EVENT_OPMASK) == TRIGGER_EVENT_TRUNCATE)
127 
128 #define TRIGGER_FIRED_FOR_ROW(event) \
129  ((event) & TRIGGER_EVENT_ROW)
130 
131 #define TRIGGER_FIRED_FOR_STATEMENT(event) \
132  (!TRIGGER_FIRED_FOR_ROW(event))
133 
134 #define TRIGGER_FIRED_BEFORE(event) \
135  (((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_BEFORE)
136 
137 #define TRIGGER_FIRED_AFTER(event) \
138  (((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_AFTER)
139 
140 #define TRIGGER_FIRED_INSTEAD(event) \
141  (((event) & TRIGGER_EVENT_TIMINGMASK) == TRIGGER_EVENT_INSTEAD)
142 
143 /*
144  * Definitions for replication role based firing.
145  */
146 #define SESSION_REPLICATION_ROLE_ORIGIN 0
147 #define SESSION_REPLICATION_ROLE_REPLICA 1
148 #define SESSION_REPLICATION_ROLE_LOCAL 2
150 
151 /*
152  * States at which a trigger can be fired. These are the
153  * possible values for pg_trigger.tgenabled.
154  */
155 #define TRIGGER_FIRES_ON_ORIGIN 'O'
156 #define TRIGGER_FIRES_ALWAYS 'A'
157 #define TRIGGER_FIRES_ON_REPLICA 'R'
158 #define TRIGGER_DISABLED 'D'
159 
160 extern ObjectAddress CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
161  Oid relOid, Oid refRelOid, Oid constraintOid, Oid indexOid,
162  bool isInternal);
163 
164 extern void RemoveTriggerById(Oid trigOid);
165 extern Oid get_trigger_oid(Oid relid, const char *name, bool missing_ok);
166 
167 extern ObjectAddress renametrig(RenameStmt *stmt);
168 
169 extern void EnableDisableTrigger(Relation rel, const char *tgname,
170  char fires_when, bool skip_system);
171 
172 extern void RelationBuildTriggers(Relation relation);
173 
174 extern TriggerDesc *CopyTriggerDesc(TriggerDesc *trigdesc);
175 
176 extern const char *FindTriggerIncompatibleWithInheritance(TriggerDesc *trigdesc);
177 
180 
181 extern void FreeTriggerDesc(TriggerDesc *trigdesc);
182 
183 extern void ExecBSInsertTriggers(EState *estate,
184  ResultRelInfo *relinfo);
185 extern void ExecASInsertTriggers(EState *estate,
186  ResultRelInfo *relinfo,
187  TransitionCaptureState *transition_capture);
189  ResultRelInfo *relinfo,
190  TupleTableSlot *slot);
191 extern void ExecARInsertTriggers(EState *estate,
192  ResultRelInfo *relinfo,
193  HeapTuple trigtuple,
194  List *recheckIndexes,
195  TransitionCaptureState *transition_capture);
197  ResultRelInfo *relinfo,
198  TupleTableSlot *slot);
199 extern void ExecBSDeleteTriggers(EState *estate,
200  ResultRelInfo *relinfo);
201 extern void ExecASDeleteTriggers(EState *estate,
202  ResultRelInfo *relinfo,
203  TransitionCaptureState *transition_capture);
204 extern bool ExecBRDeleteTriggers(EState *estate,
205  EPQState *epqstate,
206  ResultRelInfo *relinfo,
207  ItemPointer tupleid,
208  HeapTuple fdw_trigtuple);
209 extern void ExecARDeleteTriggers(EState *estate,
210  ResultRelInfo *relinfo,
211  ItemPointer tupleid,
212  HeapTuple fdw_trigtuple,
213  TransitionCaptureState *transition_capture);
214 extern bool ExecIRDeleteTriggers(EState *estate,
215  ResultRelInfo *relinfo,
216  HeapTuple trigtuple);
217 extern void ExecBSUpdateTriggers(EState *estate,
218  ResultRelInfo *relinfo);
219 extern void ExecASUpdateTriggers(EState *estate,
220  ResultRelInfo *relinfo,
221  TransitionCaptureState *transition_capture);
223  EPQState *epqstate,
224  ResultRelInfo *relinfo,
225  ItemPointer tupleid,
226  HeapTuple fdw_trigtuple,
227  TupleTableSlot *slot);
228 extern void ExecARUpdateTriggers(EState *estate,
229  ResultRelInfo *relinfo,
230  ItemPointer tupleid,
231  HeapTuple fdw_trigtuple,
232  HeapTuple newtuple,
233  List *recheckIndexes,
234  TransitionCaptureState *transition_capture);
236  ResultRelInfo *relinfo,
237  HeapTuple trigtuple,
238  TupleTableSlot *slot);
239 extern void ExecBSTruncateTriggers(EState *estate,
240  ResultRelInfo *relinfo);
241 extern void ExecASTruncateTriggers(EState *estate,
242  ResultRelInfo *relinfo);
243 
244 extern void AfterTriggerBeginXact(void);
245 extern void AfterTriggerBeginQuery(void);
246 extern void AfterTriggerEndQuery(EState *estate);
247 extern void AfterTriggerFireDeferred(void);
248 extern void AfterTriggerEndXact(bool isCommit);
249 extern void AfterTriggerBeginSubXact(void);
250 extern void AfterTriggerEndSubXact(bool isCommit);
251 extern void AfterTriggerSetState(ConstraintsSetStmt *stmt);
252 extern bool AfterTriggerPendingOnRel(Oid relid);
253 
254 
255 /*
256  * in utils/adt/ri_triggers.c
257  */
258 extern bool RI_FKey_pk_upd_check_required(Trigger *trigger, Relation pk_rel,
259  HeapTuple old_row, HeapTuple new_row);
260 extern bool RI_FKey_fk_upd_check_required(Trigger *trigger, Relation fk_rel,
261  HeapTuple old_row, HeapTuple new_row);
262 extern bool RI_Initial_Check(Trigger *trigger,
263  Relation fk_rel, Relation pk_rel);
264 
265 /* result values for RI_FKey_trigger_type: */
266 #define RI_TRIGGER_PK 1 /* is a trigger on the PK relation */
267 #define RI_TRIGGER_FK 2 /* is a trigger on the FK relation */
268 #define RI_TRIGGER_NONE 0 /* is not an RI trigger function */
269 
270 extern int RI_FKey_trigger_type(Oid tgfoid);
271 
272 #endif /* TRIGGER_H */
void ExecBSDeleteTriggers(EState *estate, ResultRelInfo *relinfo)
Definition: trigger.c:2435
void AfterTriggerBeginSubXact(void)
Definition: trigger.c:4794
bool RI_Initial_Check(Trigger *trigger, Relation fk_rel, Relation pk_rel)
Definition: ri_triggers.c:2254
TupleTableSlot * ExecIRUpdateTriggers(EState *estate, ResultRelInfo *relinfo, HeapTuple trigtuple, TupleTableSlot *slot)
Definition: trigger.c:2878
void ExecARUpdateTriggers(EState *estate, ResultRelInfo *relinfo, ItemPointer tupleid, HeapTuple fdw_trigtuple, HeapTuple newtuple, List *recheckIndexes, TransitionCaptureState *transition_capture)
Definition: trigger.c:2841
Buffer tg_newtuplebuf
Definition: trigger.h:39
unsigned int Oid
Definition: postgres_ext.h:31
NodeTag
Definition: nodes.h:26
HeapTuple tcs_original_insert_tuple
Definition: trigger.h:82
#define PGDLLIMPORT
Definition: c.h:1069
HeapTuple tg_trigtuple
Definition: trigger.h:35
TupleTableSlot * ExecIRInsertTriggers(EState *estate, ResultRelInfo *relinfo, TupleTableSlot *slot)
Definition: trigger.c:2369
void ExecBSInsertTriggers(EState *estate, ResultRelInfo *relinfo)
Definition: trigger.c:2220
Oid get_trigger_oid(Oid relid, const char *name, bool missing_ok)
Definition: trigger.c:1353
void AfterTriggerEndXact(bool isCommit)
Definition: trigger.c:4746
bool AfterTriggerPendingOnRel(Oid relid)
Definition: trigger.c:5360
void ExecASDeleteTriggers(EState *estate, ResultRelInfo *relinfo, TransitionCaptureState *transition_capture)
Definition: trigger.c:2492
struct AfterTriggersTableData * tcs_private
Definition: trigger.h:87
void RelationBuildTriggers(Relation relation)
Definition: trigger.c:1683
TupleConversionMap * tcs_map
Definition: trigger.h:73
void ExecBSTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
Definition: trigger.c:2944
void EnableDisableTrigger(Relation rel, const char *tgname, char fires_when, bool skip_system)
Definition: trigger.c:1581
void ExecASTruncateTriggers(EState *estate, ResultRelInfo *relinfo)
Definition: trigger.c:2996
void ExecARInsertTriggers(EState *estate, ResultRelInfo *relinfo, HeapTuple trigtuple, List *recheckIndexes, TransitionCaptureState *transition_capture)
Definition: trigger.c:2354
void AfterTriggerBeginQuery(void)
Definition: trigger.c:4526
PGDLLIMPORT int SessionReplicationRole
Definition: trigger.c:65
void ExecASUpdateTriggers(EState *estate, ResultRelInfo *relinfo, TransitionCaptureState *transition_capture)
Definition: trigger.c:2711
Buffer tg_trigtuplebuf
Definition: trigger.h:38
unsigned int uint32
Definition: c.h:258
int RI_FKey_trigger_type(Oid tgfoid)
Definition: ri_triggers.c:3694
void AfterTriggerEndSubXact(bool isCommit)
Definition: trigger.c:4842
TriggerDesc * CopyTriggerDesc(TriggerDesc *trigdesc)
Definition: trigger.c:1911
ObjectAddress CreateTrigger(CreateTrigStmt *stmt, const char *queryString, Oid relOid, Oid refRelOid, Oid constraintOid, Oid indexOid, bool isInternal)
Definition: trigger.c:141
void RemoveTriggerById(Oid trigOid)
Definition: trigger.c:1275
TransitionCaptureState * MakeTransitionCaptureState(TriggerDesc *trigdesc, Oid relid, CmdType cmdType)
Definition: trigger.c:4404
void AfterTriggerEndQuery(EState *estate)
Definition: trigger.c:4546
struct TransitionCaptureState TransitionCaptureState
void FreeTriggerDesc(TriggerDesc *trigdesc)
Definition: trigger.c:1966
Trigger * tg_trigger
Definition: trigger.h:37
HeapTuple tg_newtuple
Definition: trigger.h:36
ObjectAddress renametrig(RenameStmt *stmt)
Definition: trigger.c:1449
void ExecBSUpdateTriggers(EState *estate, ResultRelInfo *relinfo)
Definition: trigger.c:2651
uint32 TriggerEvent
Definition: trigger.h:28
TriggerEvent tg_event
Definition: trigger.h:33
TupleTableSlot * ExecBRUpdateTriggers(EState *estate, EPQState *epqstate, ResultRelInfo *relinfo, ItemPointer tupleid, HeapTuple fdw_trigtuple, TupleTableSlot *slot)
Definition: trigger.c:2724
const char * name
Definition: encode.c:521
Tuplestorestate * tg_oldtable
Definition: trigger.h:40
struct TriggerData TriggerData
void AfterTriggerFireDeferred(void)
Definition: trigger.c:4690
NodeTag type
Definition: trigger.h:32
bool ExecBRDeleteTriggers(EState *estate, EPQState *epqstate, ResultRelInfo *relinfo, ItemPointer tupleid, HeapTuple fdw_trigtuple)
Definition: trigger.c:2503
void ExecASInsertTriggers(EState *estate, ResultRelInfo *relinfo, TransitionCaptureState *transition_capture)
Definition: trigger.c:2277
Tuplestorestate * tg_newtable
Definition: trigger.h:41
bool RI_FKey_fk_upd_check_required(Trigger *trigger, Relation fk_rel, HeapTuple old_row, HeapTuple new_row)
Definition: ri_triggers.c:2141
bool ExecIRDeleteTriggers(EState *estate, ResultRelInfo *relinfo, HeapTuple trigtuple)
Definition: trigger.c:2604
const char * FindTriggerIncompatibleWithInheritance(TriggerDesc *trigdesc)
Definition: trigger.c:2096
void AfterTriggerBeginXact(void)
Definition: trigger.c:4494
Definition: pg_list.h:45
int Buffer
Definition: buf.h:23
void ExecARDeleteTriggers(EState *estate, ResultRelInfo *relinfo, ItemPointer tupleid, HeapTuple fdw_trigtuple, TransitionCaptureState *transition_capture)
Definition: trigger.c:2572
TupleTableSlot * ExecBRInsertTriggers(EState *estate, ResultRelInfo *relinfo, TupleTableSlot *slot)
Definition: trigger.c:2288
CmdType
Definition: nodes.h:650
bool RI_FKey_pk_upd_check_required(Trigger *trigger, Relation pk_rel, HeapTuple old_row, HeapTuple new_row)
Definition: ri_triggers.c:2084
void AfterTriggerSetState(ConstraintsSetStmt *stmt)
Definition: trigger.c:5066
Relation tg_relation
Definition: trigger.h:34