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Fix SPI example to reflect new-style calling convention for textout().

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This commit is contained in:
Tom Lane 2001-03-23 01:51:08 +00:00
parent b1065f8fc2
commit 4e911c847c
1 changed files with 42 additions and 35 deletions
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77
doc/src/sgml/spi.sgml
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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>
@ -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);
}
}
char *query;
int ret;
int proc;
SPI_finish();
/* Convert given TEXT object to a C string */
query = DatumGetCString(DirectFunctionCall1(textout,
PointerGetDatum(sql)));
return (proc);
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>