/*
XOWA: the XOWA Offline Wiki Application
Copyright (C) 2012 gnosygnu@gmail.com

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
package gplx.dbs.engines; import gplx.*; import gplx.dbs.*;
import gplx.core.stores.*; import gplx.dbs.metas.*; import gplx.dbs.sqls.*; import gplx.dbs.conn_props.*; import gplx.dbs.qrys.bats.*;
public interface Db_engine {
	String				Tid();
	Db_conn_info		Conn_info();
	Db_conn_props_mgr	Props();
	Db_batch_mgr		Batch_mgr();
	Sql_qry_wtr			Sql_wtr();
	Db_engine			New_clone(Db_conn_info conn_info);
	void				Conn_open();
	void				Conn_term();
	void				Txn_bgn(String name);		// NOTE: sqlite has different transaction semantics with SAVEPOINT
	String				Txn_end();
	void				Txn_cxl();
	void				Txn_sav();
	void				Meta_tbl_create(Dbmeta_tbl_itm meta);
	void				Meta_tbl_delete(String tbl);
	void				Meta_fld_append(String tbl, Dbmeta_fld_itm fld);
	void				Meta_idx_create(Gfo_usr_dlg usr_dlg, Dbmeta_idx_itm... ary);
	void				Meta_idx_delete(String idx);
	Dbmeta_tbl_mgr		Meta_mgr();
	boolean				Meta_tbl_exists(String tbl);
	boolean				Meta_fld_exists(String tbl, String fld);
	boolean				Meta_idx_exists(String idx);
	Object				Exec_as_obj(Db_qry qry);
	Db_rdr				Exec_as_rdr__rls_manual	(Object rdr_obj, String sql);				// Object o:ResultSet if desktop; Cursor if android
	Db_rdr				Exec_as_rdr__rls_auto	(Db_stmt stmt, Object rdr_obj, String sql);	// Object o:ResultSet if desktop; Cursor if android
	Db_stmt				Stmt_by_qry(Db_qry qry);
	Object				Stmt_by_sql(String sql);
	void				Env_db_attach(String alias, Db_conn conn);
	void				Env_db_attach(String alias, Io_url db_url);
	void				Env_db_detach(String alias);
	DataRdr				New_rdr(java.sql.ResultSet rdr, String sql); 
}