dbcondef.cpp

本源代码实现同时对数据库Oracle和MS SQL的连接

//---------------------------------------------------------------------------


#pragma hdrstop
#include "dbcondef.h"
#include "dbado.h" 
//---------------------------------------------------------------------------
USEUNIT("sharedata.cpp");
USEDEF("dbcon.def");
//#pragma package(smart_init)

extern void * g_pDB;
extern unsigned int g_nConnectCount;

bool __stdcall Connect()
{
    if( NULL==g_pDB )
    {
        try
        {
            g_pDB = new TDB_ADO();
        }
        catch(...)
        {
            g_pDB=NULL;
            return false;
        }
    }

    TDB_ADO * p = (TDB_ADO*)g_pDB;

    if( !p->GetConnected() )
    {
        p->Connect();
    }
    //连接成功以后获得连接
    g_nConnectCount++;
    
    return p->GetConnected();
}
//连接成功以后才可以调用close
bool __stdcall Close()
{
    g_nConnectCount--;
    
    if( NULL!=g_pDB && 0==g_nConnectCount)
    {
        TDB_ADO * p = (TDB_ADO*)g_pDB;

        if( p->GetConnected() )
        {
            p->Free();
        }
        delete g_pDB;
        g_pDB = NULL;
        g_nConnectCount = 0;
    }
    return true;
}
bool __stdcall GetConnected()
{
    if( NULL==g_pDB)return false;
    TDB_ADO * p = (TDB_ADO*)g_pDB;
    return p->GetConnected();
}
long __stdcall GetConnection()
{
    if( NULL==g_pDB)return 0;
    TDB_ADO * p = (TDB_ADO*)g_pDB;

    return (long)(p->GetConnection());
}