转载请说明出处：http://www.jb51.cc/article/p-dnnebmyn-bas.html

github地址：https://github.com/teffy/cocos2dx

年前已经把这部分东西学完了，但是后面出现了一个bug，紧接着公司组织关系变更，搬家到新的地方上班等事情，忙完接着就回家过年了。终于，年后开始上班了，抽出空来把blog写一下。

cocos2dx中数据存储的几种方式

1、userdefault

<span style="font-size:18px;">UserDefault是个微型数据库，你可以将基础数据类型存储在里面或从里面读取出来.
例如:setBoolForKey("played",true)是将一个bool值存储进去,其key是"played",因此你可以通过getBoolForKey("played")从数据库中读取该bool值
其支持的基础数据类型如下: bool,int,float,double,string</span>

UserDefault::getInstance()->setIntegerForKey("key",122);

int intkey = UserDefault::getInstance()->getIntegerForKey("key");
 
log("UserDefault intkey: %d",intkey);

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0"> 
  <dict> 
    <key>name</key>  
    <string>lumeng</string>  
    <key>age</key>  
    <integer>36</integer>  
    <key>family</key>  
    <dict> 
      <key>son</key>  
      <dict> 
        <key>name</key>  
        <string>xxx</string>  
        <key>age</key>  
        <integer>6</integer> 
      </dict>  
      <key>daughter</key>  
      <dict> 
        <key>name</key>  
        <string>yyy</string>  
        <key>age</key>  
        <integer>3</integer> 
      </dict> 
    </dict> 
  </dict> 
</plist>

	Dictionary* dict = Dictionary::createWithContentsOfFile("res/aaa.plist");//加载plist文件,转化为Dictionary对象
	const __String* ss = dict->valueForKey("name");//根据key获取值
	log("Plist name->%s",ss->getCString());
 
	Ref* family = dict->objectForKey("family");
	Dictionary* dictfamily = (Dictionary*) family;//根据key获取的值依然是一个dictionary，还需要继续解析
	Dictionary* son = (Dictionary*) dictfamily->objectForKey("son");
	const __String* sonname = son->valueForKey("name");
	log("Plist sonname->%s",sonname->getCString());

3、sqlite3

sqlite3相信都不陌生，是一个轻量级的数据库，在移动平台上比较流行，在android上的数据库也是基于sqlite3，那在cocos2dx上用sqlite3要用到sqlite3的库，用法：

1、sqlite3.c&sqlite3.h&sqlite3ext.h，将这三个文件放入Classes文件夹中

2、win平台要在vs中将这三个文件加入进来

3、加入数据库处理的code

#include "sqlite3.h"
 
std::string path;
bool initdb() {
	sqlite3* msqlite = NULL;
	path = FileUtils::getInstance()->fullPathForFilename(DBNAME);
//在android上需要使用FileUtils获取一个可读写的路径，
#if CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID
	path = FileUtils::getInstance()->getWritablePath();
	path += "/";
	path += DBNAME;
	FILE* dbfile = fopen(path.c_str(),"r");
	if (dbfile == nullptr) {
		ssize_t size;
		const char* data = (char*)FileUtils::getInstance()->getFileData(DBNAME,"rb",&size);
		dbfile = fopen(path.c_str(),"wb");
		fwrite(data,size,1,dbfile);
		CC_SAFE_DELETE_ARRAY(data);
	}
	fclose(dbfile);
#endif
 
	log("dbpath->%s",path.c_str());
 
	int open = sqlite3_open(path.c_str(),&msqlite);//打开数据库
	if (open != sqlITE_OK) {//判断是否可以打开
		const char* errmsg = sqlite3_errmsg(msqlite);
		log("errmsg:%s",errmsg);
		return false;
	}
	int result =
			sqlite3_exec(msqlite,"CREATE TABLE peoples (id integer primary key AUTOINCREMENT,name text,pwd text)",NULL,NULL);//执行sql语句
	log("1result:%d",result);
	result = sqlite3_exec(msqlite,"insert into peoples values(NULL,'lam','123334')",NULL);
	result = sqlite3_exec(msqlite,'wj','321')",NULL);
	log("2result:%d",result);
	sqlite3_close(msqlite);//关闭数据库
	return true;
}
 
int sqlite3result(void* key,int c,char** value,char** cols) {//sqlite的回调函数，每查询出一行结果就会回调一次，c是这一行的列数，key是cols，value是value
	log("c=%d",c);
	for (int i = 0; i < c; i++) {
		log("%s=%s",cols[i],value[i]);
	}
	return 0;
}
 
void HelloWorld::menusqlite3Callback(Ref* pSender) {
	sqlite3* msqlite;
	int open = sqlite3_open(path.c_str(),&msqlite);
	int result = sqlite3_exec(msqlite,"SELECT * FROM peoples",sqlite3result,NULL);//执行sql语句，如果需要回调，那就需要传递一个回调函数的名字，比如<span style="font-family: Arial,Helvetica,sans-serif;">sqlite3result</span>
	log("sqlite3 result:%d",result);
	sqlite3_close(msqlite);
}

c=3
id=1
name=lam
pwd=123334
c=3
id=2
name=wj
pwd=321
sqlite3 result:0

在android设备上db文件存储路径，打印的log:

02-11 19:21:28.319: D/cocos2d-x debug info(10954): dbpath->/data/data/com.teffy.readdata/files//MysqLite3.db

学习的时候看到一篇对sqlite3的封装的文章，看起来不错：http://blog.csdn.net/ym19860303/article/details/8531998

这一部分的学习就先到这里了，下一篇准备学习一下网络传输的知识

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