图书馆管理系统（javaweb+mysql）

package com.dao; import com.core.ConnDB; import java.util.*; import com.actionForm.BorrowForm; import java.sql.*; import com.actionForm.ReaderForm; import com.actionForm.BookForm; import java.util.Date; public class BorrowDAO { ConnDB conn = new ConnDB(); public int insert() { String sql = "INSERT INTO tb_borrow (bookid) vlaues(1) "; int ret = conn.executeUpdate(sql); return ret; } //*****************************图书借阅****************************** public int insertBorrow(ReaderForm readerForm,BookForm bookForm,String operator){ //获取系统日期 Date dateU=new Date(); java.sql.Date date=new java.sql.Date(dateU.getTime()); String sql1="select t.days from tb_bookinfo b left join tb_booktype t on b.typeid=t.id where b.id="+bookForm.getId()+""; ResultSet rs=conn.executeQuery(sql1); int days=0; try { if (rs.next()) { days = rs.getInt(1); } } catch (SQLException ex) { } //计算归还时间 String date_str=String.valueOf(date); String dd = date_str.substring(8,10); String DD = date_str.substring(0,8)+String.valueOf(Integer.parseInt(dd) + days); java.sql.Date backTime= java.sql.Date.valueOf(DD); String sql ="Insert into tb_borrow (readerid,bookid,borrowTime,backTime,operator) values("+readerForm.getId()+","+bookForm.getId()+",'"+date+"','"+backTime+"','"+operator+"')"; int falg = conn.executeUpdate(sql); System.out.println("添加图书借阅信息的SQL：" + sql); conn.close(); return falg; } //*************************************图书继借********************************* public int renew(int id){ String sql0="SELECT bookid FROM tb_borrow WHERE id="+id+""; ResultSet rs1=conn.executeQuery(sql0); int flag=0; try { if (rs1.next()) { //获取系统日期 Date dateU = new Date(); java.sql.Date date = new java.sql.Date(dateU.getTime()); String sql1 = "select t.days from tb_bookinfo b left join tb_booktype t on b.typeid=t.id where b.id=" + rs1.getInt(1) + ""; ResultSet rs = conn.executeQuery(sql1); int days = 0; try { if (rs.next()) { days = rs.getInt(1); } } catch (SQLException ex) { } //计算归还时间 String date_str = String.valueOf(date); String dd = date_str.substring(8, 10); String DD = date_str.substring(0, 8) + String.valueOf(Integer.parseInt(dd) + days); java.sql.Date backTime = java.sql.Date.valueOf(DD); String sql = "UPDATE tb_borrow SET backtime='" + backTime + "' where id=" + id + ""; flag = conn.executeUpdate(sql); } } catch (Exception ex1) {} conn.close(); return flag; } //*************************************图书归还********************************* public int back(int id,String operator){ String sql0="SELECT readerid,bookid FROM tb_borrow WHERE id="+id+""; ResultSet rs1=conn.executeQuery(sql0); int flag=0; try { if (rs1.next()) { //获取系统日期 Date dateU = new Date(); java.sql.Date date = new java.sql.Date(dateU.getTime()); int readerid=rs1.getInt(1); int bookid=rs1.getInt(2); String sql1="INSERT INTO tb_giveback (readerid,bookid,backTime,operator) VALUES("+readerid+","+bookid+",'"+date+"','"+operator+"')"; int ret=conn.executeUpdate(sql1); if(ret==1){ String sql2 = "UPDATE tb_borrow SET ifback=1 where id=" + id + ""; flag = conn.executeUpdate(sql2); }else{ flag=0; } } } catch (Exception ex1) { } conn.close(); return flag; } //*****************************查询图书借阅信息************************ public Collection borrowinfo(String str){ String sql="select borr.*,book.bookname,book.price,pub.pubname,bs.name bookcasename,r.barcode from (select * from tb_borrow where ifback=0) as borr left join tb_bookinfo book on borr.bookid=book.id join tb_publishing pub on book.isbn=pub.isbn join tb_bookcase bs on book.bookcase=bs.id join tb_reader r on borr.readerid=r.id where r.barcode='"+str+"'"; ResultSet rs=conn.executeQuery(sql); Collection coll=new ArrayList(); BorrowForm form=null; try { while (rs.next()) { form = new BorrowForm(); form.setId(Integer.valueOf(rs.getInt(1))); form.setBorrowTime(rs.getString(4)); form.setBackTime(rs.getString(5)); form.setBookName(rs.getString(8)); form.setPrice(Float.valueOf(rs.getFloat(9))); form.setPubName(rs.getString(10)); form.setBookcaseName(rs.getString(11)); coll.add(form); } } catch (SQLException ex) { System.out.println("借阅信息："+ex.getMessage()); } conn.close(); return coll; } //*************************到期提醒****************************************** public Collection bremind(){ Date dateU = new Date(); java.sql.Date date = new java.sql.Date(dateU.getTime()); String sql="select borr.borrowTime,borr.backTime,book.barcode,book.bookname,r.name readername,r.barcode readerbarcode from tb_borrow borr join tb_bookinfo book on book.id=borr.bookid join tb_reader r on r.id=borr.readerid where borr.backTime <='"+date+"'"; ResultSet rs=conn.executeQuery(sql); System.out.println("到时提醒的SQL："+sql); Collection coll=new ArrayList(); BorrowForm form=null; try { while (rs.next()) { form = new BorrowForm(); form.setBorrowTime(rs.getString(1)); form.setBackTime(rs.getString(2)); form.setBookBarcode(rs.getString(3)); form.setBookName(rs.getString(4)); form.setReaderName(rs.getString(5)); form.setReaderBarcode(rs.getString(6)); coll.add(form); System.out.println("图书条形码："+rs.getString(3)); } } catch (SQLException ex) { System.out.println(ex.getMessage()); } conn.close(); return coll; } //*************************图书借阅查询****************************************** public Collection borrowQuery(String strif){ String sql=""; if(strif!="all" && strif!=null && strif!=""){ sql="select * from (select borr.borrowTime,borr.backTime,book.barcode,book.bookname,r.name readername,r.barcode readerbarcode,borr.ifback from tb_borrow borr join tb_bookinfo book on book.id=borr.bookid join tb_reader r on r.id=borr.readerid) as borr where borr."+strif+""; }else{ sql="select * from (select borr.borrowTime,borr.backTime,book.barcode,book.bookname,r.name readername,r.barcode readerbarcode,borr.ifback from tb_borrow borr join tb_bookinfo book on book.id=borr.bookid join tb_reader r on r.id=borr.readerid) as borr"; } ResultSet rs=conn.executeQuery(sql); System.out.println("图书借阅查询的SQL："+sql); Collection coll=new ArrayList(); BorrowForm form=null; try { while (rs.next()) { form = new BorrowForm(); form.setBorrowTime(rs.getString(1)); form.setBackTime(rs.getString(2)); form.setBookBarcode(rs.