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148 lines
3.6 KiB
C
148 lines
3.6 KiB
C
/*
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* findoidjoins.c
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*
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* Copyright (c) 2002-2003, PostgreSQL Global Development Group
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*
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* $Header: /cvsroot/pgsql/contrib/findoidjoins/Attic/findoidjoins.c,v 1.22 2003/08/04 23:59:37 tgl Exp $
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*/
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#include "postgres_fe.h"
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#include "libpq-fe.h"
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#include "pqexpbuffer.h"
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int
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main(int argc, char **argv)
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{
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PGconn *conn;
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PQExpBufferData sql;
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PGresult *res;
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PGresult *pkrel_res;
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PGresult *fkrel_res;
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char *fk_relname;
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char *fk_nspname;
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char *fk_attname;
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char *pk_relname;
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char *pk_nspname;
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int fk,
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pk; /* loop counters */
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if (argc != 2)
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{
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fprintf(stderr, "Usage: %s database\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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initPQExpBuffer(&sql);
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appendPQExpBuffer(&sql, "dbname=%s", argv[1]);
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conn = PQconnectdb(sql.data);
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if (PQstatus(conn) == CONNECTION_BAD)
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{
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fprintf(stderr, "connection error: %s\n", PQerrorMessage(conn));
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exit(EXIT_FAILURE);
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}
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/* Get a list of relations that have OIDs */
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resetPQExpBuffer(&sql);
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appendPQExpBuffer(&sql, "%s",
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"SET search_path = public;"
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"SELECT c.relname, (SELECT nspname FROM "
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"pg_catalog.pg_namespace n WHERE n.oid = c.relnamespace) AS nspname "
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"FROM pg_catalog.pg_class c "
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"WHERE c.relkind = 'r' "
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"AND c.relhasoids "
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"ORDER BY nspname, c.relname"
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);
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res = PQexec(conn, sql.data);
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if (!res || PQresultStatus(res) != PGRES_TUPLES_OK)
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{
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fprintf(stderr, "sql error: %s\n", PQerrorMessage(conn));
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exit(EXIT_FAILURE);
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}
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pkrel_res = res;
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/* Get a list of columns of OID type (or any OID-alias type) */
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resetPQExpBuffer(&sql);
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appendPQExpBuffer(&sql, "%s",
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"SELECT c.relname, "
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"(SELECT nspname FROM pg_catalog.pg_namespace n WHERE n.oid = c.relnamespace) AS nspname, "
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"a.attname "
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"FROM pg_catalog.pg_class c, pg_catalog.pg_attribute a "
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"WHERE a.attnum > 0 AND c.relkind = 'r' "
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"AND a.attrelid = c.oid "
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"AND a.atttypid IN ('pg_catalog.oid'::regtype, "
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" 'pg_catalog.regclass'::regtype, "
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" 'pg_catalog.regoper'::regtype, "
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" 'pg_catalog.regoperator'::regtype, "
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" 'pg_catalog.regproc'::regtype, "
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" 'pg_catalog.regprocedure'::regtype, "
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" 'pg_catalog.regtype'::regtype) "
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"ORDER BY nspname, c.relname, a.attnum"
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);
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res = PQexec(conn, sql.data);
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if (!res || PQresultStatus(res) != PGRES_TUPLES_OK)
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{
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fprintf(stderr, "sql error: %s\n", PQerrorMessage(conn));
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exit(EXIT_FAILURE);
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}
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fkrel_res = res;
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/*
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* For each column and each relation-having-OIDs, look to see if the
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* column contains any values matching entries in the relation.
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*/
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for (fk = 0; fk < PQntuples(fkrel_res); fk++)
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{
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fk_relname = PQgetvalue(fkrel_res, fk, 0);
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fk_nspname = PQgetvalue(fkrel_res, fk, 1);
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fk_attname = PQgetvalue(fkrel_res, fk, 2);
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for (pk = 0; pk < PQntuples(pkrel_res); pk++)
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{
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pk_relname = PQgetvalue(pkrel_res, pk, 0);
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pk_nspname = PQgetvalue(pkrel_res, pk, 1);
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resetPQExpBuffer(&sql);
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appendPQExpBuffer(&sql,
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"SELECT 1 "
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"FROM \"%s\".\"%s\" t1, "
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"\"%s\".\"%s\" t2 "
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"WHERE t1.\"%s\"::pg_catalog.oid = t2.oid "
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"LIMIT 1",
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fk_nspname, fk_relname, pk_nspname, pk_relname, fk_attname);
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res = PQexec(conn, sql.data);
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if (!res || PQresultStatus(res) != PGRES_TUPLES_OK)
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{
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fprintf(stderr, "sql error: %s\n", PQerrorMessage(conn));
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exit(EXIT_FAILURE);
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}
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if (PQntuples(res) != 0)
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printf("Join %s.%s.%s => %s.%s.oid\n",
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fk_nspname, fk_relname, fk_attname,
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pk_nspname, pk_relname);
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PQclear(res);
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}
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}
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PQclear(pkrel_res);
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PQclear(fkrel_res);
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PQfinish(conn);
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termPQExpBuffer(&sql);
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exit(EXIT_SUCCESS);
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}
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