rdatabase.cpp

简单的图书馆管理软件

#include"RDatabase.h"   //parameters （参数）

RDatabase::RDatabase()
	{
		top=-1;
		fstream file;
		file.open("reader.txt",ios::in);//|ios::binary/*(二进制）*/);//从磁盘的reader.txt文件中读取读者信息
		while(1)
		{
			if(!file) break;
			top++;
			file.read((char *)&read[top],sizeof(read[top]));
		}
		file.close();
		top++;
	}
int RDatabase::addreader(int n,char *na)//添加读者
	{
		Reader *p=query(n);
		if(p==NULL)
		{
			read[top].addreader(n,na);
			top++;
			return 1;
		}
		return 0;
	}
void RDatabase::readerdata()
{
	int choice=1;
	char rname[20];
	int readerid;
	Reader *r;
	while(choice!=0)
	{
		cout<<"读者管理:"<<endl;
		cout<<"1:新增读者"<<endl;
		cout<<"2:更改读者名"<<endl;
		cout<<"3:删除读者"<<endl;
		cout<<"4:查找读者"<<endl;
		cout<<"5:显示所有读者"<<endl;
		cout<<"0:退出"<<endl;
		cin>>choice;
		switch(choice)
		{
		case 1:cout<<"请输入新读者的编号"<<endl;
			cin>>readerid;
			cout<<"请输入新读者的姓名:"<<endl;
			cin>>rname;
			addreader(readerid,rname);
			break;
		case 2:cout<<"请输入你的读者编号:"<<endl;
			cin>>readerid;
			r=query(readerid);
				if(r==NULL)
				{
					cout<<"对不起!您的编号有误,请核实后在再输"<<endl;
					break;
				}
				cout<<"请输入你的新姓名:"<<endl;
				cin>>rname;
				r->setname(rname);
				break;
		case 3:cout<<"!!!想删除一个读者吗?输入你想删除的读者编号:"<<endl;
			cin>>readerid;
			r=query(readerid);
			if(r==NULL)
			{
				cout<<"该读者不存在,无须删除,请核实后再操作"<<endl;
				break;
			}
			r->delbook();
			break;
		case 4:cout<<"请输入你想查找的读者编号:";
			cin>>readerid;
			r=query(readerid);
			if(r==NULL)
			{
				cout<<"该读者不存在,无法取得相关信息:";
				break;
			}
			r->disp();
			break;
		case 5:
			disp();
			break;
		}
	}
}
Reader * RDatabase::query (int readerid)
	{
		for(int i=0;i<top;i++)
			if(read[i].getno()==readerid&&read[i].gettag()==0)
			{
				return &read[i];				
			}
		return NULL;
	}
void RDatabase::disp()
	{
		for(int i=1;i<top;i++)
			read[i].disp();
	}
RDatabase::~RDatabase()//将读者信息写入reader.txt
	{
		fstream file;
		file.open("reader.txt",ios::out|ios::binary);
		for(int i=0;i<top;i++)
				file.write((char *)&read[i],sizeof(read[i]));
		file.close();
	}