Cocos2d-x数据持久化-查询数据

标签：cocos2d-x   游戏   cocos2d   

ValueMap NoteDAO::findById(string pDate)
{
	//初始化数据库
	initDB();
	sqlite3* db= NULL;
	ValueMap dict ;


	string path = dbDirectoryFile();


	if (sqlite3_open(path.c_str(), &db) != SQLITE_OK) {								①
		sqlite3_close(db);
		CCASSERT(false, "DB open failure.");
	} else {
		string qsql = "SELECT cdate,content FROM Note where cdate =?";
		sqlite3_stmt *statement;
		//预处理过程
		if (sqlite3_prepare_v2(db, qsql.c_str(), -1, &statement, NULL) == SQLITE_OK) {		②


			//绑定参数开始
			sqlite3_bind_text(statement, 1, pDate.c_str(), -1, NULL);						③


			//执行
			if (sqlite3_step(statement) == SQLITE_ROW) {							④


				char *cdate = (char *)sqlite3_column_text(statement, 0);					⑤
				char *content = (char *)sqlite3_column_text(statement, 1);


				dict["date"] = Value(cdate); 										
				dict["content"] = Value(content); 									
			}
		}
		sqlite3_finalize(statement);											⑥
		sqlite3_close(db);													⑦
	}
	return dict;
}

{
	//初始化数据库
	initDB();
	sqlite3* db= NULL;


	string path = dbDirectoryFile();
	ValueVector listData;


	if (sqlite3_open(path.c_str(), &db) != SQLITE_OK) {
		sqlite3_close(db);
		CCASSERT(false, "DB open failure.");
	} else {
		string qsql = "SELECT cdate,content FROM Note";
		sqlite3_stmt *statement;
		//预处理过程
		if (sqlite3_prepare_v2(db, qsql.c_str(), -1, &statement, NULL) == SQLITE_OK) {
			//执行
			while (sqlite3_step(statement) == SQLITE_ROW) {


				char *cdate = (char *)sqlite3_column_text(statement, 0);
				char *content = (char *)sqlite3_column_text(statement, 1);


				ValueMap dict ;
				dict["date"] = Value(cdate);
				dict["content"] = Value(content);


				listData.push_back(Value(dict));
			}
		}
		sqlite3_finalize(statement);
		sqlite3_close(db);
	}
	return listData;
}

while (sqlite3_step(statement) == SQLITE_ROW) {
    ……
}

void HelloWorld::OnClickMenu5(Ref* pSender)
{
	auto arry = NoteDAO::findAll();											①


	for (auto& v: arry)
	{
		log("-----------------");
		ValueMap row = v.asValueMap();										②
		string date = row["date"].asString();										③
		string content = row["content"].asString();									④


		log("===>date: : %s", date.c_str());
		log("===>content: : %s", content.c_str());
	}


}

HelloWorld::OnClickMenu5函数是玩家点击Read Data菜单时候回调的函数。其中代码第①行是调用NoteDAO中查询所有函数findAll ()，第②行代码是把从列表中取出的元素v，转换为ValueMap字典类型。第③行代码是从字典中取值date数据。第④行代码是从字典中取值content数据。

Cocos2d-x数据持久化-查询数据

标签：cocos2d-x   游戏   cocos2d   

原文地址：http://blog.csdn.net/tonny_guan/article/details/40431987