Method: Bdb::Db#associate

Defined in:
ext/bdb.c

#associate(vtxn, osecdb, vflags, cb_proc) ⇒ Object

db.associate(txn,sec_db,flags,proc)

associate a secondary index(database) with this (primary) database. The proc can be nil if the database is only opened DB_RDONLY.

call back proc has signature: proc(secdb,key,value)



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# File 'ext/bdb.c', line 1248

VALUE db_associate(VALUE obj, VALUE vtxn, VALUE osecdb,
		   VALUE vflags, VALUE cb_proc)
{
  t_dbh *sdbh,*pdbh;
  int rv;
  u_int32_t flags,flagsp,flagss;
  //int fdp;
  t_txnh *txn=NOTXN;

  flags=NUM2UINT(vflags);
  Data_Get_Struct(obj,t_dbh,pdbh);
  if (!pdbh->db)
    raise(0, "db is closed");
  Data_Get_Struct(osecdb,t_dbh,sdbh);
  if (!sdbh->db)
    raise(0, "sdb is closed");

  if ( ! NIL_P(vtxn) ) {
    Data_Get_Struct(vtxn,t_txnh,txn);
    if (!txn->txn)
        raise(0, "txn is closed");
  }

  if ( cb_proc == Qnil ) {
    rb_warning("db_associate: no association may be applied");
    pdbh->db->get_open_flags(pdbh->db,&flagsp);
    sdbh->db->get_open_flags(sdbh->db,&flagss);
    if ( flagsp & DB_RDONLY & flagss ) {
      rv=pdbh->db->associate(pdbh->db,txn?txn->txn:NULL,
			     sdbh->db,NULL,flags);
      if (rv)
	raise_error(rv,"db_associate: %s",db_strerror(rv));
      return Qtrue;
    } else {
      raise_error(0,"db_associate empty associate only available when both DBs opened with DB_RDONLY");
    }
  } else if ( rb_obj_is_instance_of(cb_proc,rb_cProc) != Qtrue ) {
    raise_error(0, "db_associate proc required");
  }
  
  sdbh->aproc=cb_proc;

  rv=pdbh->db->associate(pdbh->db,txn?txn->txn:NULL,sdbh->db,assoc_callback,flags);
#ifdef DEBUG_DB
  fprintf(stderr,"file is %d\n",fdp);
  fprintf(stderr,"assoc done 0x%x\n",sdbh);
#endif
  if (rv != 0) {
    raise_error(rv, "db_associate failure: %s",db_strerror(rv));
  }
  return Qtrue;
}