[C++知识库]简单工厂改进抽象工厂（大话设计模式C++实现）

类图如下：

?代码如下：

#include<iostream>
#include<string>
using namespace std;

//数据库  有Sqlserver  Access 两个
//表 两个  有User表，Department表，
//假设只有两个字段，name和id
//两个数据单独定义两个类  User Department
//对数据不进行具体处理，只是进行打印

class User{
public:
    void SetID(int id){
        m_id=id;
    }
    int GetID(){
        return m_id;
    }
    void SetName(string name){
        m_name=name;
    }
    string GetName(){
        return m_name;
    }
private:
    int m_id;
    string m_name;
};

class Department{
public:
    void SetID(int id){
        m_id=id;
    }
    int GetID(){
        return m_id;
    }
    void SetName(string name){
        m_name=name;
    }
    string GetName(){
        return m_name;
    }
private:
    int m_id;
    string m_name;
};

class IUser{
public:
    virtual void Insert(User user)=0;
    virtual User GetUser(int id)=0;
    virtual ~IUser(){

    }
};

class SqlserverUser:public IUser{
public:
     void Insert(User user){
        cout<<"在Sqlserver 中给User表增加一条记录\n";
    }
     User GetUser(int id){
         cout<<"在Sqlserver 中根据ID 得到User表一条记录\n";
         User temp;
         return temp;
    }
};

class AccessUser:public IUser{
public:
    void Insert(User user){
        cout<<"在Access 中给User表增加一条记录\n";
    }
    User GetUser(int id){
        cout<<"在Access 中根据ID 得到User表一条记录\n";
        User temp;
        return temp;
    }
};

class IDepartment{
public:
    virtual void Insert(Department user)=0;
    virtual Department GetDepartment(int id)=0;
    virtual ~IDepartment(){

    }
};

class SqlserverDepartment:public IDepartment{
public:
    void Insert(Department user){
        cout<<"在Sqlserver 中给Department表增加一条记录\n";
    }
    Department GetDepartment(int id){
        cout<<"在Sqlserver 中根据ID 得到Department表一条记录\n";
        Department temp;
        return temp;
    }
};

class AccessDepartment:public IDepartment{
public:
    void Insert(Department user){
        cout<<"在Access 中给Department表增加一条记录\n";
    }
    Department GetDepartment(int id){
        cout<<"在Access 中根据ID 得到Department表一条记录\n";
        Department temp;
        return temp;
    }
};


//工厂类

class SimpleFactory{
public:
    SimpleFactory(){
        m_dbname="Sqlserver";
    }
    IUser* CreateUser(){
        if(m_dbname=="Sqlserver")
            return new SqlserverUser();
        else if(m_dbname == "Access")
            return new AccessUser();
        else
            return NULL;

    }
    IDepartment* CreateDepartment(){
        if(m_dbname=="Sqlserver")
            return new SqlserverDepartment();
        else if(m_dbname == "Access")
            return new AccessDepartment();
        else
            return NULL;
    }
private:
    string m_dbname;
};





int main(){
User temp_user;
Department temp_department;


SimpleFactory *factory =new SimpleFactory();

IUser*user =factory->CreateUser();
IDepartment* department=factory->CreateDepartment();

delete factory;

user->Insert(temp_user);
user->GetUser(1);

delete user;

department->Insert(temp_department);
department->GetDepartment(1);

delete department;

}