È possibile eseguire il backup di un database SQLite di sola lettura con un buffer di memoria (o una risorsa PE)?

Vorrei incorporare una porzione ragionevolmente grande di dati archiviati in un database SQLite nel mio binario utilizzando la funzione "risorse personalizzate" di Windows. (Questa è una whitelist per uno strumento di registrazione) SQLite viene fornito con il supporto per i database in memoria, ma sembra che potrebbe essere limitato alla creazione di database completamente nuovi; e non sembra supportare la lettura da un buffer di memoria; ma non sono positivo.

Il database supporta qualcosa di simile? (Devo incorporare SQLite per altri motivi, quindi sarebbe fantastico usarlo anche per le whitelist...)

Chiesto da Billy ONeal

Alcune risposte al codice

/* ** This function is used to load the contents of a database file on disk  ** into the "main" database of open database connection pInMemory, or ** to save the current contents of the database opened by pInMemory into ** a database file on disk. pInMemory is probably an in-memory database,  ** but this function will also work fine if it is not. ** ** Parameter zFilename points to a nul-terminated string containing the ** name of the database file on disk to load from or save to. If parameter ** isSave is non-zero, then the contents of the file zFilename are  ** overwritten with the contents of the database opened by pInMemory. If ** parameter isSave is zero, then the contents of the database opened by ** pInMemory are replaced by data loaded from the file zFilename. ** ** If the operation is successful, SQLITE_OK is returned. Otherwise, if ** an error occurs, an SQLite error code is returned. */ int loadOrSaveDb(sqlite3 *pInMemory, const char *zFilename, int isSave){   int rc;
/* Function return code */   sqlite3 *pFile;
    /* Database connection opened on zFilename */   sqlite3_backup *pBackup;
 /* Backup object used to copy data */   sqlite3 *pTo;
/* Database to copy to (pFile or pInMemory) */   sqlite3 *pFrom;
    /* Database to copy from (pFile or pInMemory) */    /* Open the database file identified by zFilename. Exit early if this fails   ** for any reason. */   rc = sqlite3_open(zFilename, &pFile);
  if( rc==SQLITE_OK ){
/* If this is a 'load' operation (isSave==0), then data is copied
** from the database file just opened to database pInMemory.
** Otherwise, if this is a 'save' operation (isSave==1), then data
** is copied from pInMemory to pFile.  Set the variables pFrom and
** pTo accordingly. */
pFrom = (isSave ? pInMemory : pFile);
pTo   = (isSave ? pFile
: pInMemory);
/* Set up the backup procedure to copy from the "main" database of
** connection pFile to the main database of connection pInMemory.
** If something goes wrong, pBackup will be set to NULL and an error
** code and  message left in connection pTo.
**
** If the backup object is successfully created, call backup_step()
** to copy data from pFile to pInMemory. Then call backup_finish()
** to release resources associated with the pBackup object.  If an
** error occurred, then  an error code and message will be left in
** connection pTo. If no error occurred, then the error code belonging
** to pTo is set to SQLITE_OK.
*/
pBackup = sqlite3_backup_init(pTo, "main", pFrom, "main");
if( pBackup ){
(void)sqlite3_backup_step(pBackup, -1);
(void)sqlite3_backup_finish(pBackup);
}
rc = sqlite3_errcode(pTo);
  }    /* Close the database connection opened on database file zFilename   ** and return the result of this function. */   (void)sqlite3_close(pFile);
  return rc;
}