db.h

来自「C++ class and storage」· C头文件 代码 · 共 56 行

#ifndef _DB_H
#define _DB_H

#include "Record.h"

#define MAX_NUM_OF_STUDENTS 1000

class DB {
private:
	Record *_arrayDB[MAX_NUM_OF_STUDENTS];
	int _next_index;

public:
	// the default constructor, creates an empty database.
 	DB();

	// the destructor, deletes all the records in the database.
	~DB();

	// inserts the record pointed to by newRecord into the database. 
        // If a record with the same  number as newRecord's exists 
        // in the database, it returns false. Otherwise, it returns true.  
	// If database is full, it silently fails.
	bool insert(Record *newRecord); 

	// searches the database for a record with Num, 
	// if the record is found, its content will be copied to 
	// the searchRecord, and the method returns true. Otherwise
	// the method returns false.
	bool retrieve(unsigned int Num, Record * & searchRecord);

	// deletes the record with Num from the database. If 
	// the record was indeed in the database, it returns true.
	// Returns false otherwise.
	bool remove(unsigned int Num);

	// deletes all the records in the database.
	void clear();

	// returns true if there is no record in the database, otherwise,
	// it returns false.
	bool isEmpty();

	// returns true if the database is full, i.e. no further 
	// records can be inserted into the database, otherwise, it returns
	// false.
	bool isFull(); 

	// dumps the content of the database to the standard output (using 
	// the "print" method of the Record class), sorted in ascending
	// order of  numbers, separated by empty lines. 
	void dump();
}; //DB

#endif