75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
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/**
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* @file PaiVirtualObject.h
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* @brief 该类对象不保存在数据库，将自动赋予虚拟DBID
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* @date 2012-05-15
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*/
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#ifndef PAI_FRAME_PIOBJECTMODEL_PAIVIRTUALOBJECT_H
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#define PAI_FRAME_PIOBJECTMODEL_PAIVIRTUALOBJECT_H
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#include "PaiObject.h"
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#include "Turtle.h"
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namespace pai
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{
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namespace objectmodel
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{
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/**
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* @class PaiVirtualObject
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* @brief 该类对象不保存在数据库，将自动赋予虚拟DBID
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*/
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class PAI_OBJECTMODEL_EXPORT PaiVirtualObject: public PaiObject
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{
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public:
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DECLARE_PAI_OBJECT(PaiVirtualObject, "{8ed66593-743e-43dc-9b11-cf548a0d129d}")
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/**
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* @brief 构造函数
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* @param[in] pParent 父对象指针
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*/
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PaiVirtualObject(PaiObject *pParent = NULL);
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/**
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* @brief 虚析构函数
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*/
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virtual ~PaiVirtualObject();
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/**
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* @brief 获得父节点的DBID
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* @return 父节点DBID
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*/
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long long GetParentDBID() const;
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/**
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* @brief 加载DBID为dbid的数据，不加载孩子
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* @param[in] dbid 需要加载对象DBID
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* @return 是否加载成功
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* @note 该函数在虚对象下无意义，因为无需加载，此处仅为防止抛出异常
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*/
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virtual bool Load(const long long dbid);
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/**
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* @brief 克隆参数对象
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* @param[in] srcObject 源对象
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* @note 该函数在基类不会抛出异常，因需对象一般不能克隆，因此此处来抛出异常，防止出错
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*/
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virtual void Clone(const PaiObject & srcObject);
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/**
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* @brief 生成新的虚拟DBID
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* @return 新的虚拟DBID
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*/
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static long long GenerateVirtualDBID();
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private:
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/**
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* @note 某些节点不是在数据库保存的，但这时也许要一个唯一DBID来进行查询该对象，
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* 对此类对象用该变量计数来赋予一个唯一的虚拟DBID，计数从 -1 开始，依次递减，该类定义为0.
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*/
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static long long m_VirtualDBIDCounter; ///< 虚拟DBID
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};
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}
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}
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#endif ///<PAI_FRAME_PIOBJECTMODEL_PAIVIRTUALOBJECT_H
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