求大神帮我解释几句程序，图书管理系统读者部分的。

int Reader::select_Library(Chaxun & se)//图书馆在册书查询
{
MYSQL_RES * point;
int bb[7]={14,14,5,14,12,4,4};
string aa="select book_name as '书名',ISBN,writer as '作者',publish as '出版社',publish_time as '出版日期', price as '价格',maxbook-number as '可借量' from items";
point=se.Demand(aa.c_str());
way->Show_data(point,bb);
return 0;
}

int Reader::select_Library(Chaxun & se)//图书馆在册书查询
{
MYSQL_RES * point;
int bb[7]={14,14,5,14,12,4,4};
string aa="select book_name as '书名',ISBN,writer as '作者',publish as '出版社',publish_time as '出版日期', price as '价格',maxbook-number as '可借量' from items"; //在 items表中查询书名、作者、出版社、出版日期、价格、可借量字段，然后调用show_data显示表格
point=se.Demand(aa.c_str());
way->Show_data(point,bb);
return 0;
}