1 /***************************************************************************
2 * Copyright (C) 2007 by Prabakaran Thirumalai *
3 * praba_tuty@yahoo.com *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
20 #ifndef ABSSQLCONNECTION_H
21 #define ABSSQLCONNECTION_H
25 * @class AbsSqlConnection
27 * \brief{ Represents a database connection to sql engine.}
29 * It represents the database connection to the sql engine.\n
30 * All database operations shall be done within the context of the connection.\n
31 * Application should first create object of this class to accessing the database\n
33 * Each connection has only one active transaction at any given point of time, all \n
34 * operations which happen using this connection object will be done as part of that \n
38 * SERIALIZABLE isolation level is not supported. \n
40 class AbsSqlConnection
43 AbsSqlConnection
*innerConn
;
45 void setInnerConnection(AbsSqlConnection
*conn
) { innerConn
= conn
; }
46 AbsSqlConnection
* getInnerConnection() { return innerConn
; }
47 virtual Connection
& getConnObject() =0;
49 /** opens connection to the sql engine
50 * @param user username for authentication
51 * @param pass password for authentication
54 virtual DbRetVal
connect (char *user
, char * pass
) =0;
56 /** closes connection to the sql engine and releases all the resources
59 virtual DbRetVal
disconnect () = 0;
61 /** Commits active transaction. \n
62 * It makes all the changes made in the current transaction permanent and \n
63 * it also releases the locks held by the current transaction.\n
64 * After a transaction commits, application is required to start another \n
65 * transaction for further database operations.\n
68 virtual DbRetVal
commit() = 0;
70 /** Aborts the active transaction.\n
71 * undo all the changes made in the current transaction and it also \n
72 * releases the locks held by the current transaction.\n
73 * After a transaction rollback, application is required to start another \n
74 * transaction for further database operations.\n
77 virtual DbRetVal
rollback() = 0;
79 /** Starts a new transaction.\n
80 * The previous transaction should be either committed or rollback \n
81 * before beginTrans is called. \n
82 * Applications are required to start transaction before they attempt any \n
83 * database operation.\n
84 * @param isoLevel isolation level. Default is read committed.
87 virtual DbRetVal
beginTrans (IsolationLevel isoLevel
= READ_COMMITTED
) = 0;
88 virtual ~AbsSqlConnection(){}