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Jakob Huber
postgres-lambda-diff
Commits
4e911c84
Commit
4e911c84
authored
24 years ago
by
Tom Lane
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Fix SPI example to reflect new-style calling convention for textout().
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b1065f8f
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doc/src/sgml/spi.sgml
+44
-37
44 additions, 37 deletions
doc/src/sgml/spi.sgml
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4e911c84
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@@ -2691,7 +2691,7 @@ are invisible to the query scan. For example, in query
INSERT INTO a SELECT * FROM a
tuples inserted are invisible for SELECT' scan. In effect, this
tuples inserted are invisible for SELECT'
s
scan. In effect, this
duplicates the database table within itself (subject to unique index
rules, of course) without recursing.
</Para>
...
...
@@ -2708,7 +2708,7 @@ of Q) or after Q is done.
<Para>
This example of SPI usage demonstrates the visibility rule.
There are more complex examples in
in
src/test/regress/regress.c and
There are more complex examples in src/test/regress/regress.c and
in contrib/spi.
</Para>
...
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@@ -2719,47 +2719,54 @@ query using SPI_exec and returns the number of tuples for which the query
executed:
<ProgramListing>
#include "executor/spi.h"
/* this is what you need to work with SPI */
#include "executor/spi.h"
/* this is what you need to work with SPI */
int execq(text *sql, int cnt);
int
execq(text *sql, int cnt)
{
int ret;
int proc = 0;
SPI_connect();
ret = SPI_exec(textout(sql), cnt);
proc = SPI_processed;
/*
* If this is SELECT and some tuple(s) fetched -
* returns tuples to the caller via elog (NOTICE).
*/
if ( ret == SPI_OK_SELECT && SPI_processed > 0 )
{
TupleDesc tupdesc = SPI_tuptable->tupdesc;
SPITupleTable *tuptable = SPI_tuptable;
char buf[8192];
int i;
for (ret = 0; ret < proc; ret++)
{
HeapTuple tuple = tuptable->vals[ret];
for (i = 1, buf[0] = 0; i <= tupdesc->natts; i++)
sprintf(buf + strlen (buf), " %s%s",
SPI_getvalue(tuple, tupdesc, i),
(i == tupdesc->natts) ? " " : " |");
elog (NOTICE, "EXECQ: %s", buf);
}
}
SPI_finish();
return (proc);
char *query;
int ret;
int proc;
/* Convert given TEXT object to a C string */
query = DatumGetCString(DirectFunctionCall1(textout,
PointerGetDatum(sql)));
SPI_connect();
ret = SPI_exec(query, cnt);
proc = SPI_processed;
/*
* If this is SELECT and some tuple(s) fetched -
* returns tuples to the caller via elog (NOTICE).
*/
if ( ret == SPI_OK_SELECT && SPI_processed > 0 )
{
TupleDesc tupdesc = SPI_tuptable->tupdesc;
SPITupleTable *tuptable = SPI_tuptable;
char buf[8192];
int i,j;
for (j = 0; j < proc; j++)
{
HeapTuple tuple = tuptable->vals[j];
for (i = 1, buf[0] = 0; i <= tupdesc->natts; i++)
sprintf(buf + strlen (buf), " %s%s",
SPI_getvalue(tuple, tupdesc, i),
(i == tupdesc->natts) ? " " : " |");
elog (NOTICE, "EXECQ: %s", buf);
}
}
SPI_finish();
pfree(query);
return (proc);
}
</ProgramListing>
</Para>
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