csqldriver.cpp

很好用的数据库连接组件

#include "stdafx.h"
#include "CSqlDriver.h"

// database states
#define DBState_Open		0x0001
#define DBState_OpenError	0x0002

CSqlDriver :: CSqlDriver():dbState(0),error()
{
}

CSqlDriver ::~CSqlDriver()
{
}


bool CSqlDriver :: isOpen()const 
{
    
    return((dbState&DBState_Open)==DBState_Open);
}

/*!
    Returns TRUE if the there was an error opening the database
    connection; otherwise returns FALSE.
*/

bool CSqlDriver :: isOpenError()const 
{
    return((dbState&DBState_OpenError)==DBState_OpenError);
}


/*!
    Protected function which sets the open state of the database to \a
    o. Derived classes can use this function to report the status of
    open().

    \sa open(), setOpenError()
*/

void CSqlDriver :: setOpen(bool o)
{
    if(o)
    dbState|=DBState_Open ;
    else 
    dbState&=~DBState_Open ;
}

/*!
    Protected function which sets the open error state of the database
    to \a e. Derived classes can use this function to report the
    status of open(). Note that if \a e is TRUE the open state of the
    database is set to closed (i.e. isOpen() returns FALSE).

    \sa open(), setOpenError()
*/

void CSqlDriver :: setOpenError(bool e)
{
    if(e)
    {
        dbState|=DBState_OpenError ;
        dbState&=~DBState_Open ;
    }
    else 
    dbState&=~DBState_OpenError ;
}


/*!
    Protected function which allows derived classes to set the value
    of the last error, \a e, that occurred on the database.

    \sa lastError()
*/
void CSqlDriver :: setLastError(const CSqlError&e)
{
    error=e ;
}

/*!
    Returns a CSqlError object which contains information about the
    last error that occurred on the database.
*/

CSqlError CSqlDriver :: lastError()const 
{
    return error ;
}

/*!
    Returns a string representation of the NULL value for the
    database. This is used, for example, when constructing INSERT and
    UPDATE statements. The default implementation returns the string
    "NULL".
*/

string CSqlDriver :: nullText()const 
{
    return "NULL" ;
}