Age Owner TLA Line data Source code
1 : /*
2 : * contrib/spi/autoinc.c
3 : */
4 : #include "postgres.h"
5 :
6 : #include "access/htup_details.h"
7 : #include "catalog/pg_type.h"
8 : #include "commands/sequence.h"
9 : #include "commands/trigger.h"
10 : #include "executor/spi.h"
11 : #include "utils/builtins.h"
12 : #include "utils/rel.h"
13 :
6158 tgl 14 CBC 6 : PG_MODULE_MAGIC;
15 :
8175 16 7 : PG_FUNCTION_INFO_V1(autoinc);
17 :
18 : Datum
8350 19 36 : autoinc(PG_FUNCTION_ARGS)
20 : {
21 36 : TriggerData *trigdata = (TriggerData *) fcinfo->context;
22 : Trigger *trigger; /* to get trigger name */
23 : int nargs; /* # of arguments */
24 : int *chattrs; /* attnums of attributes to change */
9320 vadim4o 25 36 : int chnattrs = 0; /* # of above */
26 : Datum *newvals; /* vals of above */
27 : bool *newnulls; /* null flags for above */
28 : char **args; /* arguments */
29 : char *relname; /* triggered relation name */
30 : Relation rel; /* triggered relation */
31 36 : HeapTuple rettuple = NULL;
32 : TupleDesc tupdesc; /* tuple description */
33 : bool isnull;
34 : int i;
35 :
8350 tgl 36 36 : if (!CALLED_AS_TRIGGER(fcinfo))
37 : /* internal error */
7199 tgl 38 UBC 0 : elog(ERROR, "not fired by trigger manager");
4566 tgl 39 CBC 36 : if (!TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
40 : /* internal error */
4566 tgl 41 UBC 0 : elog(ERROR, "must be fired for row");
4566 tgl 42 CBC 36 : if (!TRIGGER_FIRED_BEFORE(trigdata->tg_event))
43 : /* internal error */
7199 tgl 44 UBC 0 : elog(ERROR, "must be fired before event");
45 :
8350 tgl 46 CBC 36 : if (TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
47 18 : rettuple = trigdata->tg_trigtuple;
48 18 : else if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
49 18 : rettuple = trigdata->tg_newtuple;
50 : else
51 : /* internal error */
5911 bruce 52 UBC 0 : elog(ERROR, "cannot process DELETE events");
53 :
8350 tgl 54 CBC 36 : rel = trigdata->tg_relation;
9320 vadim4o 55 36 : relname = SPI_getrelname(rel);
56 :
8350 tgl 57 36 : trigger = trigdata->tg_trigger;
58 :
9320 vadim4o 59 36 : nargs = trigger->tgnargs;
60 36 : if (nargs <= 0 || nargs % 2 != 0)
61 : /* internal error */
9224 bruce 62 UBC 0 : elog(ERROR, "autoinc (%s): even number gt 0 of arguments was expected", relname);
63 :
9320 vadim4o 64 CBC 36 : args = trigger->tgargs;
65 36 : tupdesc = rel->rd_att;
66 :
9173 bruce 67 36 : chattrs = (int *) palloc(nargs / 2 * sizeof(int));
68 36 : newvals = (Datum *) palloc(nargs / 2 * sizeof(Datum));
2343 tgl 69 36 : newnulls = (bool *) palloc(nargs / 2 * sizeof(bool));
70 :
9173 bruce 71 72 : for (i = 0; i < nargs;)
72 : {
73 36 : int attnum = SPI_fnumber(tupdesc, args[i]);
74 : int32 val;
75 : Datum seqname;
76 :
2343 tgl 77 36 : if (attnum <= 0)
7199 tgl 78 UBC 0 : ereport(ERROR,
79 : (errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
80 : errmsg("\"%s\" has no attribute \"%s\"",
81 : relname, args[i])));
82 :
9173 bruce 83 CBC 36 : if (SPI_gettypeid(tupdesc, attnum) != INT4OID)
7199 tgl 84 UBC 0 : ereport(ERROR,
85 : (errcode(ERRCODE_TRIGGERED_ACTION_EXCEPTION),
86 : errmsg("attribute \"%s\" of \"%s\" must be type INT4",
87 : args[i], relname)));
88 :
9173 bruce 89 CBC 36 : val = DatumGetInt32(SPI_getbinval(rettuple, tupdesc, attnum, &isnull));
90 :
9320 vadim4o 91 36 : if (!isnull && val != 0)
92 : {
93 27 : i += 2;
94 27 : continue;
95 : }
96 :
97 9 : i++;
98 9 : chattrs[chnattrs] = attnum;
5493 tgl 99 9 : seqname = CStringGetTextDatum(args[i]);
8313 100 9 : newvals[chnattrs] = DirectFunctionCall1(nextval, seqname);
101 : /* nextval now returns int64; coerce down to int32 */
7906 102 9 : newvals[chnattrs] = Int32GetDatum((int32) DatumGetInt64(newvals[chnattrs]));
9173 bruce 103 9 : if (DatumGetInt32(newvals[chnattrs]) == 0)
104 : {
8313 tgl 105 3 : newvals[chnattrs] = DirectFunctionCall1(nextval, seqname);
7906 106 3 : newvals[chnattrs] = Int32GetDatum((int32) DatumGetInt64(newvals[chnattrs]));
107 : }
2343 108 9 : newnulls[chnattrs] = false;
2219 noah 109 9 : pfree(DatumGetTextPP(seqname));
9320 vadim4o 110 9 : chnattrs++;
111 9 : i++;
112 : }
113 :
114 36 : if (chnattrs > 0)
115 : {
2343 tgl 116 9 : rettuple = heap_modify_tuple_by_cols(rettuple, tupdesc,
117 : chnattrs, chattrs,
118 : newvals, newnulls);
119 : }
120 :
9173 bruce 121 36 : pfree(relname);
122 36 : pfree(chattrs);
123 36 : pfree(newvals);
2343 tgl 124 36 : pfree(newnulls);
125 :
8350 126 36 : return PointerGetDatum(rettuple);
127 : }
|
