additional triggers. Cleaned up Makefile and the other files.
# psql -U postgres Mir < postgresql.script
(This installs the the trigger binary and creates a new trigger.)
-
-# rm /tmp/trigger.so
CC=gcc
PGINC=/usr/include/postgresql
+CFLAGS=-I$(PGINC)
-trigger.so: trigger.o
- $(CC) -shared -dynamic -o trigger.so trigger.o
- cp trigger.so /tmp
- chmod 755 /tmp/trigger.so
+# If changed, also change postgresql.script
+INSTALLDIR=../../../Mir/src
-trigger.o: trigger.c
- $(CC) -I$(PGINC) -c trigger.c -o trigger.o
+install: dupetrigger.so
+ cp dupetrigger.so $(INSTALLDIR)
+ chmod 755 $(INSTALLDIR)/dupetrigger.so
+ #
+ # Now, change the path to dupetrigger.so in postgresql.script to the
+ # absolute path where dupetrigger.so is installed (this
+ # is typically ../../../Mir/src)
+
+dupetrigger.so: dupetrigger.o
+ $(CC) -shared -dynamic -o dupetrigger.so dupetrigger.o
clean:
- rm -rf trigger.o trigger.so
+ rm -rf dupetrigger.o dupetrigger.so
tidy: clean
we want to do this check as fast as possible.
So Mir simply issues the INSERT. By this INSERT statement, a trigger gets,
-well, triggered that calculate a CRC-32 checksum of the comment and searches
-for rows with the same checksum. If it finds the checksum, the INSERT gets
-aborted. If the checksum isn't found, it is appended to the row and the
-INSERT is executed.
+well, triggered that calculates a CRC-32 checksum of the comment and
+searches for rows with the same checksum. If it finds the checksum, the
+INSERT gets aborted. If the checksum isn't found, it is appended to the row
+and the INSERT is executed.
The trigger works for INSERTs and UPDATEs.
--- /dev/null
+//
+//
+// This File contructs a PostgreSQL trigger.
+// The trigger is fired BEFORE an INSERT or UPDATE of an article
+// or comment. It first calculates a CRC32 checksum of the row to be
+// inserted or updated and checks whether there exists already another
+// row with the same checksum and the same content. In this case,
+// the trigger returns NULL and thus, aborts the SQL command.
+//
+// Author: Matthias Jordan <mjordan@code-fu.de>
+//
+
+
+#include "executor/spi.h"
+#include "commands/trigger.h"
+#include "string.h"
+
+extern Datum dupecheck(PG_FUNCTION_ARGS);
+
+PG_FUNCTION_INFO_V1(dupecheck);
+
+
+
+
+//
+//
+// CRC32 stuff
+//
+
+// crc32 table based on the following polynom
+#define CRC32_POLY 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */
+
+u_long crc32_table[256] =
+ {0x0000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
+ 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
+ 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
+ 0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
+ 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
+ 0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
+ 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
+ 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
+ 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
+ 0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
+ 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
+ 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
+ 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x54bf6a4,
+ 0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
+ 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
+ 0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
+ 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
+ 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
+ 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
+ 0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
+ 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
+ 0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
+ 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
+ 0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
+ 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
+ 0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0xe56f0ff,
+ 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
+ 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
+ 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
+ 0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
+ 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
+ 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
+ 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
+ 0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
+ 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
+ 0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0xfdc1bec,
+ 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
+ 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
+ 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
+ 0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
+ 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
+ 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
+ 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4};
+
+
+static u_long crc32(u_char *buf, unsigned len)
+{
+ u_char *p;
+ u_long crc;
+
+ crc = 0xffffffff; /* preload shift register, per CRC-32 spec */
+ for (p = buf; len > 0; ++p, --len)
+ {
+ crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *p];
+ }
+ return ~crc; /* transmit complement, per CRC-32 spec */
+} /* crc32 */
+
+
+
+
+
+//
+//
+// Trigger stuff
+//
+
+
+
+
+Datum dupecheck(PG_FUNCTION_ARGS)
+{
+ TriggerData *trigdata = (TriggerData *) fcinfo->context;
+ TupleDesc tupdesc;
+ HeapTuple rettuple;
+ bool isnull;
+ int ret = 0, i, fnumber;
+ long rowstrlen = 0,
+ crc;
+ int maxitems = 3,
+ num;
+ char *items[maxitems],
+ *rowstring,
+ *query;
+
+
+ /* Make sure trigdata is pointing at what I expect */
+ if (!CALLED_AS_TRIGGER(fcinfo))
+ elog(ERROR, "dupecheck: not fired by trigger manager");
+
+ /* tuple to return to Executor */
+ if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
+ rettuple = trigdata->tg_newtuple;
+ else
+ rettuple = trigdata->tg_trigtuple;
+
+ if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
+ return PointerGetDatum(NULL);
+
+ tupdesc = trigdata->tg_relation->rd_att;
+
+ /* Connect to SPI manager */
+ if ((ret = SPI_connect()) < 0)
+ ret = SPI_connect();
+ elog(NOTICE, "dupecheck: SPI_connect returned %d", ret);
+
+ // Now we are connected to the database's SPI manager
+ // We will now construct a string of some important row values.
+ // First, we determine how long the string will be to allocate memory
+ // To include an additional item, add another SPI_getvalue line and
+ // increase maxitems above by 1
+
+ items[0] = SPI_getvalue(rettuple, tupdesc, SPI_fnumber(tupdesc, "creator"));
+ items[1] = SPI_getvalue(rettuple, tupdesc, SPI_fnumber(tupdesc, "title"));
+ items[2] = SPI_getvalue(rettuple, tupdesc, SPI_fnumber(tupdesc, "description"));
+
+ for (i=0; (i < maxitems); i++)
+ {
+ rowstrlen += strlen(items[i]);
+ }
+ rowstrlen++; // add space for 0-terminator
+
+ rowstring = malloc(rowstrlen);
+ if (rowstring == NULL)
+ {
+ // Big problem.
+ return PointerGetDatum(NULL);
+ }
+
+ *rowstring = 0;
+ for (i=0; (i < maxitems); i++)
+ {
+ strcat(rowstring, items[i]);
+ }
+
+ // rowstring now contains the data of the maxitems important
+ // items of the table record. Now we calculate the CRC-32 checksum
+ // of the rowstring
+
+ crc = crc32(rowstring, rowstrlen - 1);
+
+ // Now we allocate some space and construct the SQL query
+ query = malloc(47 + 11 + 2 + 1); // SELECT part + crc32 + "';" + 0-term
+ if (query == NULL)
+ {
+ // Big problem
+ return PointerGetDatum(NULL);
+ }
+
+ sprintf(query, "SELECT count(*) FROM comment WHERE checksum='%ld';", crc);
+ ret = SPI_exec(query, 2);
+ num = SPI_getbinval(SPI_tuptable->vals[0], SPI_tuptable->tupdesc, 1, &isnull);
+
+ if ((ret == SPI_OK_SELECT) && (num > 0))
+ {
+ elog(NOTICE, "dupecheck: UBD prevented (dupe dropped)");
+ return PointerGetDatum(NULL);
+ }
+ else
+ {
+ // The checksum wasn't found. So we modify the tuple to be
+ // inserted and add the fresh checksum.
+ int attnum;
+ Datum value;
+ char nulls = 0;
+
+ elog(NOTICE, "dupecheck: Adding checksum to INSERT");
+ attnum = SPI_fnumber(tupdesc, "checksum");
+ value = (Datum) crc;
+ rettuple = SPI_modifytuple(trigdata->tg_relation, rettuple, 1, &attnum, &value, &nulls);
+ }
+
+ SPI_finish();
+ return PointerGetDatum(rettuple);
+}
+
\connect - postgres
DROP FUNCTION dupecheck();
DROP TRIGGER dupetrigger ON comment;
-CREATE FUNCTION dupecheck() RETURNS OPAQUE AS '/tmp/trigger.so' LANGUAGE 'C';
+CREATE FUNCTION dupecheck() RETURNS OPAQUE AS '/path/to/dupetrigger.so' LANGUAGE 'C';
CREATE TRIGGER dupetrigger BEFORE INSERT OR UPDATE ON comment FOR EACH ROW EXECUTE PROCEDURE dupecheck();
+CREATE INDEX comment_checksum_index on comment (checksum);
+++ /dev/null
-//
-//
-// This File contructs a PostgreSQL trigger.
-// The trigger is fired BEFORE an INSERT or UPDATE of an article
-// or comment. It first calculates a CRC32 checksum of the row to be
-// inserted or updated and checks whether there exists already another
-// row with the same checksum and the same content. In this case,
-// the trigger returns NULL and thus, aborts the SQL command.
-//
-// Author: Matthias Jordan <mjordan@code-fu.de>
-//
-
-
-#include "executor/spi.h"
-#include "commands/trigger.h"
-#include "string.h"
-
-extern Datum dupecheck(PG_FUNCTION_ARGS);
-
-PG_FUNCTION_INFO_V1(dupecheck);
-
-
-
-
-//
-//
-// CRC32 stuff
-//
-
-// crc32 table based on the following polynom
-#define CRC32_POLY 0x04c11db7 /* AUTODIN II, Ethernet, & FDDI */
-
-u_long crc32_table[256] =
- {0x0000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
- 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, 0x2b4bcb61,
- 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, 0x4c11db70, 0x48d0c6c7,
- 0x4593e01e, 0x4152fda9, 0x5f15adac, 0x5bd4b01b, 0x569796c2, 0x52568b75,
- 0x6a1936c8, 0x6ed82b7f, 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3,
- 0x709f7b7a, 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
- 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, 0xbaea46ef,
- 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, 0xa4ad16ea, 0xa06c0b5d,
- 0xd4326d90, 0xd0f37027, 0xddb056fe, 0xd9714b49, 0xc7361b4c, 0xc3f706fb,
- 0xceb42022, 0xca753d95, 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1,
- 0xe13ef6f4, 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
- 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, 0x2ac12072,
- 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, 0x018aeb13, 0x54bf6a4,
- 0x0808d07d, 0x0cc9cdca, 0x7897ab07, 0x7c56b6b0, 0x71159069, 0x75d48dde,
- 0x6b93dddb, 0x6f52c06c, 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08,
- 0x571d7dd1, 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
- 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, 0xbb60adfc,
- 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, 0x832f1041, 0x87ee0df6,
- 0x99a95df3, 0x9d684044, 0x902b669d, 0x94ea7b2a, 0xe0b41de7, 0xe4750050,
- 0xe9362689, 0xedf73b3e, 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2,
- 0xc6bcf05f, 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
- 0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, 0x644fc637,
- 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, 0x4f040d56, 0x4bc510e1,
- 0x46863638, 0x42472b8f, 0x5c007b8a, 0x58c1663d, 0x558240e4, 0x51435d53,
- 0x251d3b9e, 0x21dc2629, 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5,
- 0x3f9b762c, 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0xe56f0ff,
- 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, 0xf5ee4bb9,
- 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, 0xeba91bbc, 0xef68060b,
- 0xd727bbb6, 0xd3e6a601, 0xdea580d8, 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd,
- 0xcda1f604, 0xc960ebb3, 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7,
- 0xae3afba2, 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
- 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, 0x857130c3,
- 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, 0x4e8ee645, 0x4a4ffbf2,
- 0x470cdd2b, 0x43cdc09c, 0x7b827d21, 0x7f436096, 0x7200464f, 0x76c15bf8,
- 0x68860bfd, 0x6c47164a, 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e,
- 0x18197087, 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0xfdc1bec,
- 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, 0x2056cd3a,
- 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, 0xcc2b1d17, 0xc8ea00a0,
- 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, 0xdbee767c, 0xe3a1cbc1, 0xe760d676,
- 0xea23f0af, 0xeee2ed18, 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4,
- 0x89b8fd09, 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
- 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, 0xa2f33668,
- 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4};
-
-
-static u_long crc32(u_char *buf, unsigned len)
-{
- u_char *p;
- u_long crc;
-
- crc = 0xffffffff; /* preload shift register, per CRC-32 spec */
- for (p = buf; len > 0; ++p, --len)
- {
- crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *p];
- }
- return ~crc; /* transmit complement, per CRC-32 spec */
-} /* crc32 */
-
-
-
-
-
-//
-//
-// Trigger stuff
-//
-
-
-
-
-Datum dupecheck(PG_FUNCTION_ARGS)
-{
- TriggerData *trigdata = (TriggerData *) fcinfo->context;
- TupleDesc tupdesc;
- HeapTuple rettuple;
- bool isnull;
- int ret = 0, i, fnumber;
- long rowstrlen = 0,
- crc;
- int maxitems = 3,
- num;
- char *items[maxitems],
- *rowstring,
- *query;
-
-
- /* Make sure trigdata is pointing at what I expect */
- if (!CALLED_AS_TRIGGER(fcinfo))
- elog(ERROR, "dupecheck: not fired by trigger manager");
-
- /* tuple to return to Executor */
- if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
- rettuple = trigdata->tg_newtuple;
- else
- rettuple = trigdata->tg_trigtuple;
-
- if (TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
- return PointerGetDatum(NULL);
-
- tupdesc = trigdata->tg_relation->rd_att;
-
- /* Connect to SPI manager */
- if ((ret = SPI_connect()) < 0)
- ret = SPI_connect();
- elog(NOTICE, "dupecheck: SPI_connect returned %d", ret);
-
- // Now we are connected to the database's SPI manager
- // We will now construct a string of some important row values.
- // First, we determine how long the string will be to allocate memory
- // To include an additional item, add another SPI_getvalue line and
- // increase maxitems above by 1
-
- items[0] = SPI_getvalue(rettuple, tupdesc, SPI_fnumber(tupdesc, "creator"));
- items[1] = SPI_getvalue(rettuple, tupdesc, SPI_fnumber(tupdesc, "title"));
- items[2] = SPI_getvalue(rettuple, tupdesc, SPI_fnumber(tupdesc, "description"));
-
- for (i=0; (i < maxitems); i++)
- {
- rowstrlen += strlen(items[i]);
- }
- rowstrlen++; // add space for 0-terminator
-
- rowstring = malloc(rowstrlen);
- if (rowstring == NULL)
- {
- // Big problem.
- return PointerGetDatum(NULL);
- }
-
- *rowstring = 0;
- for (i=0; (i < maxitems); i++)
- {
- strcat(rowstring, items[i]);
- }
-
- // rowstring now contains the data of the maxitems important
- // items of the table record. Now we calculate the CRC-32 checksum
- // of the rowstring
-
- crc = crc32(rowstring, rowstrlen - 1);
-
- // Now we allocate some space and construct the SQL query
- query = malloc(47 + 11 + 2 + 1); // SELECT part + crc32 + "';" + 0-term
- if (query == NULL)
- {
- // Big problem
- return PointerGetDatum(NULL);
- }
-
- sprintf(query, "SELECT count(*) FROM comment WHERE checksum='%ld';", crc);
- ret = SPI_exec(query, 2);
- num = SPI_getbinval(SPI_tuptable->vals[0], SPI_tuptable->tupdesc, 1, &isnull);
-
- if ((ret == SPI_OK_SELECT) && (num > 0))
- {
- elog(NOTICE, "dupecheck: UBD prevented (dupe dropped)");
- return PointerGetDatum(NULL);
- }
- else
- {
- // The checksum wasn't found. So we modify the tuple to be
- // inserted and add the fresh checksum.
- int attnum;
- Datum value;
- char nulls = 0;
-
- elog(NOTICE, "dupecheck: Adding checksum to INSERT");
- attnum = SPI_fnumber(tupdesc, "checksum");
- value = (Datum) crc;
- rettuple = SPI_modifytuple(trigdata->tg_relation, rettuple, 1, &attnum, &value, &nulls);
- }
-
- SPI_finish();
- return PointerGetDatum(rettuple);
-}
-
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