shared: sqlitedbservice: Introduce exec(),execBool(). Refactor

shared/filesaver.cpp

@@ -25,22 +25,10 @@ SaveFileResult FileSaver::addFile(QString path)
 	QString absPath = info.absoluteFilePath();
 
 	auto mtime = info.lastModified().toSecsSinceEpoch();
-
-	bool exists = false;
-	if(this->fileSaverOptions.fillExistingContentless)
-	{
-		exists = this->dbService->fileExistsInDatabase(absPath, mtime, 'c');
-	}
-	else
-	{
-		exists = this->dbService->fileExistsInDatabase(absPath, mtime);
-	}
-
-	if(exists)
+	if(this->dbService->fileExistsInDatabase(absPath, mtime))
 	{
 		return SKIPPED;
 	}
-
 	return saveFile(info);
 }
 

shared/sqlitedbservice.cpp

@@ -151,7 +151,7 @@ QSqlQuery SqliteDbService::exec(QString querystr, std::initializer_list<QVariant
 	}
 	if(!query.exec())
 	{
-		throw LooqsGeneralException("Error while exec(): " + query.lastError().text());
+		throw LooqsGeneralException("Error while trying to query for file existance: " + query.lastError().text());
 	}
 	return query;
 }