mirror of https://github.com/Gnucash/gnucash
some SQL backend prototyping work. git-svn-id: svn+ssh://svn.gnucash.org/repo/gnucash/trunk@2309 57a11ea4-9604-0410-9ed3-97b8803252fdzzzoldreleases/1.4
Linas Vepstas
26 years ago
parent
e92c343927
commit
565ae5fd90
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/********************************************************************\
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* Backend.c -- utility routines for dealing with the data backend *
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* Copyright (C) 2000 Linas Vepstas <linas@linas.org> *
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* *
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* This program is free software; you can redistribute it and/or *
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* modify it under the terms of the GNU General Public License as *
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* published by the Free Software Foundation; either version 2 of *
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* the License, or (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License*
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* along with this program; if not, contact: *
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* *
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* Free Software Foundation Voice: +1-617-542-5942 *
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* 59 Temple Place - Suite 330 Fax: +1-617-542-2652 *
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* Boston, MA 02111-1307, USA gnu@gnu.org *
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* *
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\********************************************************************/
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#include "Account.h"
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#include "AccountP.h"
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#include "BackendP.h"
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#include "Group.h"
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#include "GroupP.h"
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#include "TransactionP.h"
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#include "util.h"
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/* static short module = MOD_ENGINE; */
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/********************************************************************\
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* Fetch the backend *
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\********************************************************************/
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Backend *
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xaccAccountGetBackend (Account * acc)
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{
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Account *parent_acc;
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AccountGroup * grp;
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if (!acc) return NULL;
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/* find the first account group that has a backend */
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grp = (AccountGroup *) acc->parent;
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while (grp) {
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if (grp->backend) return (grp->backend);
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parent_acc = grp -> parent;
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grp = NULL;
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if (parent_acc) {
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grp = (AccountGroup *) parent_acc->parent;
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}
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}
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return NULL;
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}
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/********************************************************************\
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* Fetch the backend *
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\********************************************************************/
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Backend *
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xaccTransactionGetBackend (Transaction *trans)
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{
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Backend *be;
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Split *s;
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if (!trans) return NULL;
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/* find an account */
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s = trans->splits[0];
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if (!s) return NULL;
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/* I suppose it would be more 'technically correct' to make sure that
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* all splits share teh same backend, and flag an error if they
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* don't. However, at this point, it seems quite unlikely, so we'll
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* just use teh first backend we find.
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*/
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be = xaccAccountGetBackend (s->acc);
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return be;
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}
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/********************************************************************\
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* Set the backend *
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\********************************************************************/
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void
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xaccGroupSetBackend (AccountGroup *grp, Backend *be)
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{
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if (!grp) return;
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grp->backend = be;
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}
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/************************* END OF FILE ********************************/
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@ -0,0 +1,55 @@
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/*
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* BackendP.h
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*
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* Pseudo-object defining how the engine can interact with different
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* back-ends (which will probably be sql databases).
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*
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* The callbacks will be called at the appropriate times during
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* a session to allow the backend to store the data as needed.
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*
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*/
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#ifndef __XACC_BACKEND_P_H__
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#define __XACC_BACKEND_P_H__
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#include "config.h"
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#include "Account.h"
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#include "Group.h"
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#include "Session.h"
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#include "Transaction.h"
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typedef struct _backend Backend;
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struct _backend
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{
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AccountGroup * (*session_begin) (Session *, const char * sessionid);
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int (*session_end) (Session *);
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int (*account_begin_edit) (Backend *, Account *, int defer);
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int (*account_commit_edit) (Backend *, Account *);
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int (*trans_begin_edit) (Backend *, Transaction *, int defer);
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int (*trans_commit_edit) (Backend *, Transaction *);
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int (*trans_rollback_edit) (Backend *, Transaction *);
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};
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/*
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* The xaccGetAccountBackend() subroutine will find the
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* persistent-data storage backend associated with this account.
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* This routine traverses up the account heirarchy until it
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* finds and account-group node that has a backend associated with
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* it. The assumption is that all accounts in that account-group
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* share a common back-end.
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*
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* The xaccGetTransactionBackend() subroutine does the same, for a given
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* transaction.
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*/
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Backend * xaccAccountGetBackend (Account *);
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Backend * xaccTransactionGetBackend (Transaction *);
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/*
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* The xaccGroupSetBackend() associates a backend to a group
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*/
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void xaccGroupSetBackend (AccountGroup *, Backend *);
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#endif /* __XACC_BACKEND_P_H__ */
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