Jsp/Servlet

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Java

BookDAO.java：源码内容
							package com.dao;
import com.core.ConnDB;
import java.sql.*;
import java.util.*;
import com.actionForm.BookForm;
public class BookDAO {
    private ConnDB conn=new ConnDB();
//查询数据
public Collection query(String strif){
BookForm bookForm=null;
Collection bookColl=new ArrayList();
String sql="";
if(strif!="all" && strif!=null && strif!=""){
    sql="select * from (select b.*,c.name as bookcaseName,p.pubname as publishing,t.typename from tb_bookinfo b left join tb_bookcase c on b.bookcase=c.id join tb_publishing p on b.ISBN=p.ISBN join tb_booktype t on b.typeid=t.id where b.del=0)  as book where book."+strif+"'";
}else{
    sql="select b.*,c.name as bookcaseName,p.pubname as publishing,t.typename from tb_bookinfo b left join tb_bookcase c on b.bookcase=c.id join tb_publishing p on b.ISBN=p.ISBN join tb_booktype t on b.typeid=t.id where b.del=0";
}
System.out.println("图书查询时的SQL："+sql);
ResultSet rs=conn.executeQuery(sql);
try {
    while (rs.next()) {
        bookForm=new BookForm();
        bookForm.setBarcode(rs.getString(1));
        bookForm.setBookName(rs.getString(2));
        bookForm.setTypeId(rs.getInt(3));
        bookForm.setAuthor(rs.getString(4));
        bookForm.setTranslator(rs.getString(5));
        bookForm.setIsbn(rs.getString(6));
        bookForm.setPrice(Float.valueOf(rs.getString(7)));  //此处必须进行类型转换
        bookForm.setPage(rs.getInt(8));
        bookForm.setBookcaseid(rs.getInt(9));
        bookForm.setStorage(rs.getInt(10));
        bookForm.setInTime(rs.getString(11));
        bookForm.setOperator(rs.getString(12));
        bookForm.setDel(rs.getInt(13));
        bookForm.setId(Integer.valueOf(rs.getString(14)));
        bookForm.setBookcaseName(rs.getString(15));
        bookForm.setPublishing(rs.getString(16));
        bookForm.setTypeName(rs.getString(17));
        bookColl.add(bookForm);
        System.out.print(bookForm.getTypeName());
    }
} catch (SQLException ex) {
}
conn.close();
return bookColl;
}
//用于修改的查询
public BookForm queryM(BookForm bookForm){
BookForm bookForm1=null;
String sql="select b.*,c.name as bookcaseName,p.pubname as publishing,t.typename from tb_bookinfo b left join tb_bookcase c on b.bookcase=c.id join tb_publishing p on b.ISBN=p.ISBN join tb_booktype t on b.typeid=t.id where b.id="+bookForm.getId()+"";
System.out.println("修改时的SQL："+sql);
ResultSet rs=conn.executeQuery(sql);
try {
    while (rs.next()) {
        bookForm1=new BookForm();
        bookForm1.setBarcode(rs.getString(1));
        bookForm1.setBookName(rs.getString(2));
        bookForm1.setTypeId(rs.getInt(3));
        bookForm1.setAuthor(rs.getString(4));
        bookForm1.setTranslator(rs.getString(5));
        bookForm1.setIsbn(rs.getString(6));
        bookForm1.setPrice(Float.valueOf(rs.getString(7)));  //此处必须进行类型转换
        bookForm1.setPage(rs.getInt(8));
        bookForm1.setBookcaseid(rs.getInt(9));
        bookForm1.setStorage(rs.getInt(10));
        bookForm1.setInTime(rs.getString(11));
        bookForm1.setOperator(rs.getString(12));
        bookForm1.setDel(rs.getInt(13));
        bookForm1.setId(Integer.valueOf(rs.getString(14)));
        bookForm1.setBookcaseName(rs.getString(15));
        bookForm1.setPublishing(rs.getString(16));
        bookForm1.setTypeName(rs.getString(17));
    }
} catch (SQLException ex) {
}
conn.close();
return bookForm1;
}
    //用于借阅的查询
   public BookForm queryB(String f,String key){
   BookForm bookForm1=null;
   String sql="select b.*,c.name as bookcaseName,p.pubname as publishing,t.typename from tb_bookinfo b left join tb_bookcase c on b.bookcase=c.id join tb_publishing p on b.ISBN=p.ISBN join tb_booktype t on b.typeid=t.id where b."+f+"='"+key+"'";
   System.out.println("查询借阅信息时的SQL："+sql);
   ResultSet rs=conn.executeQuery(sql);
   try {
       if (rs.next()) {
           bookForm1=new BookForm();
           bookForm1.setBarcode(rs.getString(1));
           bookForm1.setBookName(rs.getString(2));
           bookForm1.setTypeId(rs.getInt(3));
           bookForm1.setAuthor(rs.getString(4));
           bookForm1.setTranslator(rs.getString(5));
           bookForm1.setIsbn(rs.getString(6));
           bookForm1.setPrice(Float.valueOf(rs.getString(7)));  //此处必须进行类型转换
           bookForm1.setPage(rs.getInt(8));
           bookForm1.setBookcaseid(rs.getInt(9));
           bookForm1.setStorage(rs.getInt(10));
           bookForm1.setInTime(rs.getString(11));
           bookForm1.setOperator(rs.getString(12));
           bookForm1.setDel(rs.getInt(13));
           bookForm1.setId(Integer.valueOf(rs.getString(14)));
           bookForm1.setBookcaseName(rs.getString(15));
           bookForm1.setPublishing(rs.getString(16));
           bookForm1.setTypeName(rs.getString(17));
       }
   } catch (SQLException ex) {
   }
   conn.close();
   return bookForm1;
   }
//添加数据
public int insert(BookForm bookForm){
String sql1="SELECT * FROM tb_bookinfo WHERE barcode='"+bookForm.getBarcode()+"' or bookname='"+bookForm.getBookName()+"'";
ResultSet rs = conn.executeQuery(sql1);
String sql = "";
int falg = 0;
try {
if (rs.next()) {
    falg = 2;
} else {
    sql ="Insert into tb_bookinfo (barcode,bookname,typeid,author,translator,isbn,price,page,bookcase,storage,inTime,operator) values('"+bookForm.getBarcode()+"','"+bookForm.getBookName()+"',"+bookForm.getTypeId()+",'"+bookForm.getAuthor()+"','"+bookForm.getTranslator()+"','"+bookForm.getIsbn()+"',"+bookForm.getPrice()+","+bookForm.getPage()+","+bookForm.getBookcaseid()+","+bookForm.getStorage()+",'"+bookForm.getInTime()+"','"+bookForm.getOperator()+"')";
    falg = conn.executeUpdate(sql);
    System.out.println("添加图书的SQL：" + sql);
    conn.close();
}
} catch (SQLException ex) {
falg = 0;
}
System.out.println("falg:"+falg);
return falg;
}
//修改数据
public int update(BookForm bookForm){
String sql="Update tb_bookinfo set typeid="+bookForm.getTypeId()+",author='"+bookForm.getAuthor()+"',translator='"+bookForm.getTranslator()+"',isbn='"+bookForm.getIsbn()+"',price="+bookForm.getPrice()+",page="+bookForm.getPage()+",bookcase="+bookForm.getBookcaseid()+",storage="+bookForm.getStorage()+" where id="+bookForm.getId()+"";
int falg=conn.executeUpdate(sql);
System.out.println("修改数据时的SQL："+sql);
conn.close();
return falg;
}
//删除数据
public int delete(BookForm bookForm){
String sql="UPDATE tb_bookinfo SET del=1 where id="+bookForm.getId()+"";
int falg=conn.executeUpdate(sql);
System.out.println("删除时的SQL："+sql);
return falg;
}
}

						