【Cocos2d-x】集成wxSqlite3到Cocos2d-x

关于wxSqlite3

wxSqlite3是一个轻量级的开源数据库项目，基于sqlite3，相比sqlite3增加了数据库加密功能，是用C语言实现的，跨平台。

下载wxsqlite3

下载地址1：http://sourceforge.net/projects/wxcode/files/Components/wxSQLite3/

下载地址2：http://pan.baidu.com/s/11wzpk

集成wxsqlite3到Cocos2d-x

1.在cocos2d-x引擎external目录下新建wxsqlite3\src目录

2.把wxsqlite3-3.1.1\sqlite3\secure\src目录下的.h和.c文件拷贝到wxsqlite3/src目录下

3.添加sqltesecure.c到libLocalStorage项目中。（Cocos2d-x2.x是添加到libExtensions项目）

4.设置预编译宏：SQLITE_HAS_CODEC，该宏用于开启加密功能。

5.相关api

(1). 设置密码（在sqlite3_open和sqlite3_close之间任何地方使用）

int sqlite3_key(
  sqlite3 *db,       //数据库引用
  const void *pKey,  //密码
  int nKey           //密码长度
);

(2). 修改密码（在sqlite3_open和sqlite3_close之间任何地方使用）

int sqlite3_rekey(
  sqlite3 *db,               //数据库引用
  const void *pKey,          //新密码
  int nKey                   //密码长度
);

示例：在LocalStorage.cpp中的localStorageInit方法中初始化数据库时设置密码

void localStorageInit( const char *fullpath)
{
	if( ! _initialized ) {

		int ret = 0;
		
		if (!fullpath)
			ret = sqlite3_open(":memory:",&_db);
		else
			ret = sqlite3_open(fullpath, &_db);

		// 设置密码
		#if (CC_TARGET_PLATFORM != CC_PLATFORM_WIN32)
			sqlite3_key(_db,"test",4);
		#endif		

		localStorageCreateTable();

		// SELECT
		const char *sql_select = "SELECT value FROM data WHERE key=?;";
		ret |= sqlite3_prepare_v2(_db, sql_select, -1, &_stmt_select, NULL);

		// REPLACE
		const char *sql_update = "REPLACE INTO data (key, value) VALUES (?,?);";
		ret |= sqlite3_prepare_v2(_db, sql_update, -1, &_stmt_update, NULL);

		// DELETE
		const char *sql_remove = "DELETE FROM data WHERE key=?;";
		ret |= sqlite3_prepare_v2(_db, sql_remove, -1, &_stmt_remove, NULL);

		if( ret != SQLITE_OK ) {
			printf("Error initializing DB\n");
			// report error
		}
		
		_initialized = 1;
	}
}

测试工程svn地址：http://code.taobao.org/svn/wxsqlite3_cocos2dx/trunk

编译到Android

1.在external\wxsqlite目录下添加Android.mk文件，文件内容如下：

2.工程中引入wxsqlite3静态库

cocos2d-x3.x：修改cocos2d\cocos\storage\local-storage目录下的Android.mk文件如下

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE := cocos_localstorage_static

LOCAL_MODULE_FILENAME := liblocalstorage

LOCAL_SRC_FILES := LocalStorage.cpp


LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/..


LOCAL_C_INCLUDES := $(LOCAL_PATH)/../..

LOCAL_CFLAGS += -Wno-psabi
LOCAL_CFLAGS += -DSQLITE_HAS_CODEC  ##该宏用于开启加密功能
LOCAL_EXPORT_CFLAGS += -Wno-psabi

LOCAL_WHOLE_STATIC_LIBRARIES := cocos2dx_static
LOCAL_WHOLE_STATIC_LIBRARIES += wxsqlite3_static #引入静态库

include $(BUILD_STATIC_LIBRARY)

$(call import-module,.)
$(call import-module,external/wxsqlite3)  #引入模块

cocos2d-x2.x：修改cocos2d-x-2.x\extensions目录下的Android.mk文件如下，直接把加密功能增加到引擎扩展库

LOCAL_PATH := $(call my-dir)  
include $(CLEAR_VARS)  
  
LOCAL_MODULE    := cocos_extension_static  
  
LOCAL_MODULE_FILENAME := libextension  
  
LOCAL_SRC_FILES := AssetsManager/AssetsManager.cpp \  
##太长，这里就省略了源文件的导入##  
  
  
LOCAL_WHOLE_STATIC_LIBRARIES := cocos2dx_static  
LOCAL_WHOLE_STATIC_LIBRARIES += cocosdenshion_static  
LOCAL_WHOLE_STATIC_LIBRARIES += cocos_curl_static  
LOCAL_WHOLE_STATIC_LIBRARIES += box2d_static  
LOCAL_WHOLE_STATIC_LIBRARIES += chipmunk_static  
LOCAL_WHOLE_STATIC_LIBRARIES += libwebsockets_static  
LOCAL_WHOLE_STATIC_LIBRARIES += wxsqlite3_static ##引入静态库  
  
LOCAL_CFLAGS += -DCC_ENABLE_CHIPMUNK_INTEGRATION=1  
LOCAL_EXPORT_CFLAGS += -DCC_ENABLE_CHIPMUNK_INTEGRATION=1  
LOCAL_CPPFLAGS += -DCC_ENABLE_CHIPMUNK_INTEGRATION=1  
LOCAL_EXPORT_CPPFLAGS += -DCC_ENABLE_CHIPMUNK_INTEGRATION=1  

LOCAL_CFLAGS := -fexceptions
LOCAL_CFLAGS += -DSQLITE_HAS_CODEC  ##该宏用于开启加密功能 

LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH) \  
                           $(LOCAL_PATH)/CCBReader \  
                           $(LOCAL_PATH)/GUI/CCControlExtension \  
                           $(LOCAL_PATH)/GUI/CCScrollView \  
                           $(LOCAL_PATH)/network \  
                           $(LOCAL_PATH)/LocalStorage \  
               $(LOCAL_PATH)/CCArmature  
  
LOCAL_C_INCLUDES := $(LOCAL_PATH)/../scripting/lua/cocos2dx_support \  
                    $(LOCAL_PATH)/../scripting/lua/lua  

                      
include $(BUILD_STATIC_LIBRARY)  
  
$(call import-module,cocos2dx)  
$(call import-module,CocosDenshion/android)  
$(call import-module,cocos2dx/platform/third_party/android/prebuilt/libcurl)  
$(call import-module,external/Box2D)  
$(call import-module,external/chipmunk)  
$(call import-module,external/libwebsockets/android)  
$(call import-module,external/wxsqlite3)  ##引入模块  

3.Cocos2d-x引擎在Android平台下默认是通过Jni调用android sdk自带的SQLiteOpenHelper和SQLiteDatabase去创建和操作数据库的，所以在Android下使用wxsqlite3，需要进行以下几个步骤：

（1）.注释LocalStorage.cpp中对于安卓平台的判断宏

（2）.修改Android.mk：Cocos2d-x对Android平台下数据库的操作封装在LocalStorageAndroid.cpp，现在修改为使用LocalStorage.cpp，使用跨平台的wxsqlite3

Cocos2d-x3.0：修改cocos2d\cocos\storage\local-storage目录下的Android.mk，删除LOCAL_SRC_FILES字段中的LocalStorageAndroid.cpp 

Cocos2d-x2.0：修改cocos2d-x-2.x\extensions目录下的Android.mk，修改LOCAL_SRC_FILES字段中LocalStorageAndroid.cpp为LocalStorage.cpp

现在编译工程，就可以了。生成数据库文件应该在/data/data/包名/files目录下，如果加密成功了，使用sqlite查看器打开应该会失败。

编译到IOS

1.打开ios工程，右键Add File，添加wxsqlite3文件夹到工程。

只保留sqlite3.h和sqlite3secure.c的引用即可。

2.点击工程——Build Settings——设置预编译宏（SQLITE_HAS_CODEC），开启加密功能

3.编译成功！