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New findoidjoins examines oid columns to find join relationships.

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This commit is contained in:
Bruce Momjian
1998-08-11 02:32:00 +00:00
parent ffb120ecc6
commit 85c165cd4c
8 changed files with 1284 additions and 1 deletions
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93
contrib/findoidjoins/findoidjoins.c Normal file
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/*
* findoidjoins.c, required pgsql/contrib/pginterface
*
*/
#include <stdio.h>
#include "halt.h"
#include <libpq-fe.h>
#include "pginterface.h"
PGresult *attres, *relres;
int
main(int argc, char **argv)
{
char query[4000];
char relname[256];
char relname2[256];
char attname[256];
int count;
if (argc != 2)
halt("Usage: %s database\n", argv[0]);
connectdb(argv[1], NULL, NULL, NULL, NULL);
on_error_continue();
on_error_stop();
doquery("BEGIN WORK");
doquery("\
DECLARE c_attributes BINARY CURSOR FOR \
SELECT relname, a.attname \
FROM pg_class c, pg_attribute a, pg_type t \
WHERE a.attnum > 0 AND \
relkind = 'r' AND \
typname = 'oid' AND \
a.attrelid = c.oid AND \
a.atttypid = t.oid \
ORDER BY 1; \
");
doquery("FETCH ALL IN c_attributes");
attres = get_result();
doquery("\
DECLARE c_relations BINARY CURSOR FOR \
SELECT relname \
FROM pg_class c \
WHERE relkind = 'r' AND \
relname != 'pg_user' \
ORDER BY 1; \
");
doquery("FETCH ALL IN c_relations");
relres = get_result();
set_result(attres);
while (fetch(relname, attname) != END_OF_TUPLES)
{
set_result(relres);
reset_fetch();
while (fetch(relname2) != END_OF_TUPLES)
{
unset_result(relres);
sprintf(query,"\
DECLARE c_matches BINARY CURSOR FOR \
SELECT count(*)
FROM %s t1, %s t2 \
WHERE t1.%s = t2.oid", relname, relname2, attname);
doquery(query);
doquery("FETCH ALL IN c_matches");
fetch(&count);
if (count != 0)
printf("Join %s.%s => %s.oid\n", relname, attname, relname2);
doquery("CLOSE c_matches");
set_result(relres);
}
set_result(attres);
}
set_result(relres);
doquery("CLOSE c_relations");
PQclear(relres);
set_result(attres);
doquery("CLOSE c_attributes");
PQclear(attres);
unset_result(attres);
doquery("COMMIT WORK");
disconnectdb();
return 0;
}