include/SqlConnection.h

   1 /***************************************************************************
   2  *   Copyright (C) 2007 by Prabakaran Thirumalai   *
   3  *   praba_tuty@yahoo.com   *
   4  *                                                                         *
   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.                                   *
   9  *                                                                         *
  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.                          *
  14  *                                                                         *
  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 SQLCONNECTION_H
  21 #define SQLCONNECTION_H
  22 #include<CSql.h>
  23 #include<AbsSqlConnection.h>
  24 #include<SqlFactory.h>
  25 class SqlStatement;
  26
  27 struct CachedStmtNode{
  28     SqlStatement *sqlStmt;
  29     int stmtLength;
  30     char *sqlString;
  31 };
  32 class SqlConnection : public AbsSqlConnection
  33 {
  34     Connection conn;
  35     bool isConnOpen;
  36     public:
  37     List cachedStmts;
  38     SqlConnection(){ innerConn = NULL; isConnOpen = false; }
  39     ~SqlConnection();
  40
  41     /** opens connection to the sql engine
  42     *   @param user username for authentication
  43     *   @param pass password for authentication
  44     *   @return DbRetVal
  45     */
  46     DbRetVal connect (char *user, char * pass) {
  47         DbRetVal ret = conn.open(user, pass);
  48         if (ret == OK) isConnOpen = true;
  49         return ret;
  50     }
  51
  52     /** closes connection to the database and releases all the resources
  53     *   @return DbRetVal
  54     */
  55     DbRetVal disconnect () {
  56         DbRetVal ret = conn.close();
  57         if (ret == OK) isConnOpen = false;
  58         return ret;
  59     }
  60
  61     /** Commits active transaction.
  62     *   It makes all the changes made in the current transaction permanent and <br/>
  63     *   it also releases the locks held by the current transaction.<br/>
  64     *   After a transaction commits, application is required to start another <br/>
  65     *   transaction for further database operations.
  66     *   @return DbRetVal
  67     */
  68     DbRetVal commit() { return conn.commit(); }
  69
  70     /** Aborts the active transaction.
  71     *   undo all the changes made in the current transaction and it also <br/>
  72     *   releases the locks held by the current transaction.<br/>
  73     *   After a transaction rollback, application is required to start another <br/>
  74     *   transaction for further database operations.
  75     *   @return DbRetVal
  76     */
  77     DbRetVal rollback() { return conn.rollback(); }
  78
  79     /** Starts a transaction.
  80     *   The previous transaction should be either committed or rollback <br/>
  81     *   before beginTrans is called. <br/>
  82     *   Applications are required to start transaction before they attempt any <br>
  83     *   database operation.
  84     *   @param isoLevel isolation level. Default is read committed.
  85     *   @return DbRetVal
  86     */
  87     DbRetVal beginTrans (IsolationLevel isoLevel = READ_COMMITTED,
  88                          TransSyncMode mode = OSYNC)
  89         { return conn.startTransaction(isoLevel); }
  90
  91     Connection& getConnObject(){  return conn; }
  92     bool isConnectionOpen() { if (isConnOpen) return true; return false; };
  93     DbRetVal getExclusiveLock(){ return conn.getExclusiveLock(); }
  94
  95     SqlStatement* findInCache(char *stmtStr);
  96     void flushCacheStmt();
  97     void addToCache(SqlStatement *stmt, char *stmtStr);
  98
  99     friend class SqlFactory;
 100 };
 101
 102 #endif