improve loop condition in ReadDB (#2881)

gframe/data_manager.cpp

@@ -18,10 +18,9 @@ bool DataManager::ReadDB(sqlite3* pDB) {
 	if (sqlite3_prepare_v2(pDB, sql, -1, &pStmt, nullptr) != SQLITE_OK)
 		return Error(pDB, pStmt);
 	wchar_t strBuffer[4096];
-	int step = 0;
-	do {
-		step = sqlite3_step(pStmt);
-		if (step == SQLITE_ROW) {
+	for (int step = sqlite3_step(pStmt); step != SQLITE_DONE; step = sqlite3_step(pStmt)) {
+		if (step != SQLITE_ROW)
+			return Error(pDB, pStmt);
 		uint32_t code = static_cast<uint32_t>(sqlite3_column_int64(pStmt, 0));
 		auto& cd = _datas[code];
 		cd.code = code;
@@ -62,9 +61,6 @@ bool DataManager::ReadDB(sqlite3* pDB) {
 			}
 		}
 	}
-		else if (step != SQLITE_DONE)
-			return Error(pDB, pStmt);
-	} while (step == SQLITE_ROW);
 	sqlite3_finalize(pStmt);
 	for (const auto& entry : extra_setcode) {
 		const auto& code = entry.first;