QDianaDb.cc

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/*
 *
 * Author: MP 19/04/06
 * $Id: QDianaDb.cc 511 2006-12-01 12:09:32Z didomiz $
 *
 * Class QDianaDb: interface to data base
 *
*/
 
#include <stdexcept>
#include <iostream>
#include <sstream>
 
#include "QDianaDb.hh"
#include "QError.hh"
 
 
QDianaDb *QDianaDb::me = 0;
 
//______________________________________________________________________________
QDianaDb *QDianaDb::Get() {
    // singleton 
    
    if ( !me ) {
                std::string host;
                std::string port;
                std::string user;
                std::string pwd;
                std::string db;
                
                const char *p = getenv("DIANA_DB_HOST");
                if (p)
                        host = p;
                else
                   DianaThrow(QError(QERR_UNDEFINED_PARAMETER, __FILE__,
                                     __LINE__, "Cannot find environment"
                                     " variable DIANA_DB_HOST"));
 
                p = getenv("DIANA_DB_PORT");
                if (p)
                        port = p;
                else
                   DianaThrow(QError(QERR_UNDEFINED_PARAMETER, __FILE__,
                                     __LINE__, "Cannot find environment"
                                     " variable DIANA_DB_PORT"));
 
                p = getenv("DIANA_DB_USER");
                if (p)
                        user = p;
                else
                   DianaThrow(QError(QERR_UNDEFINED_PARAMETER, __FILE__,
                                     __LINE__, "Cannot find environment"
                                     " variable DIANA_DB_USER"));
 
                p = getenv("DIANA_DB_PWD");
                if (p)
                        pwd = p;
                else
                   DianaThrow(QError(QERR_UNDEFINED_PARAMETER, __FILE__,
                                     __LINE__, "Cannot find environment"
                                     " variable DIANA_DB_PWD"));
 
                p = getenv("DIANA_DB_NAME");
                if (p)
                        db = p;
                else
                   DianaThrow(QError(QERR_UNDEFINED_PARAMETER, __FILE__,
                                     __LINE__, "Cannot find environment"
                                     " variable DIANA_DB_NAME"));
                
        me = new QDianaDb(host,port,user,pwd,db);
        }
    return me;
}
 
QDianaDb *QDianaDb::Get(const std::string& host, const std::string& port,
                const std::string& user, const std::string& pwd,
                const std::string& db)
{
        if(!me) {
 
        me = new QDianaDb(host,port,user,pwd,db);
}
    return me;
}
 
 
//______________________________________________________________________________
QDianaDb::QDianaDb(const std::string& host, const std::string& port, 
                const std::string& usr, const std::string& pwd,
                const std::string& db) : QDb(host,port,usr,pwd,db) {
        //
        // private ctor
        //
 
        Clear();
}
 
//______________________________________________________________________________
QDianaDb::~QDianaDb() {
        //
        // dtor
        //
        Clear();
}
 
 
//______________________________________________________________________________
void QDianaDb::Reset() {
        if ( IsConnected() )
                Disconnect();
        if ( me ) 
                delete me;
        me = 0;
}
 
//______________________________________________________________________________
void QDianaDb::Clear() {
        //
        // clear all  tables 
        //
}