是否有可能使用内存缓冲区(或PE资源)来备份只读SQLite数据库?

我想用Windows的“自定义资源”function将存储在SQLite数据库中的相当大量的数据embedded到我的二进制文件中。 (这是一个日志logging工具的白名单)SQLite的确支持内存数据库 ,但看起来可能仅限于创build全新的数据库; 并且似乎不支持从内存缓冲区读取; 但我不积极。

数据库是否支持这样的事情? (由于其他原因,我必须embeddedSQLite,因此将它用于白名单也是非常棒的)

sqlite文档http://www.sqlite.org/backup.html的在线备份部分有一些代码可以做你想做的事情(即将内存数据库转储到文件,或将文件重新加载到内存数据库中)。 这应该允许您将预先编制索引的数据库保存到可以添加到资源中并在运行时加载到内存中的文件中。

这是有问题的代码(直接从上面链接的页面复制)

/* ** 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; }