java.sql.SQLException: Column not found 错误怎么处理

数据库如下
create table book(
number varchar(10),
bookname varchar(10),
publish varchar(10),
author varchar(10),
isbn varchar(10),
price varchar(10)
)
代码：import java.io.*;
import java.net.*;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.awt.*;
import java.awt.event.*;import javax.swing.*;
public class UpdateBook extends JPanel{
private JTextField number,bookname,publish,author,isbn,price;
private JLabel jnumber,jbookname,jpublish,jauthor,jisbn,jprice;
private JButton button1,button2;
PrintStream output;
DataInputStream input;
String message="";
String bookinfor[];
//构造方法
public UpdateBook(){
this.setLayout(null);
        jnumber=new JLabel("编号");
        number=new JTextField();
        jbookname=new JLabel("书名");
        bookname=new JTextField();
        jpublish=new JLabel("出版社");
        publish=new JTextField();
        jauthor=new JLabel("作者");
        author=new JTextField();
        jisbn=new JLabel("ISBN");
        isbn=new JTextField();
        jprice=new JLabel("价格");
        price=new JTextField();
        button1=new JButton("查询");
        button2=new JButton("修改");
        //设置控件的位置和大小
        jnumber.setBounds(30,20,60,26);
        jbookname.setBounds(30,100,60,26);
        jpublish.setBounds(30,130,60,26);
        jauthor.setBounds(30,160,60,26);
        jisbn.setBounds(30,190,60,26);
        jprice.setBounds(30,220,60,26);
        number.setBounds(110,20,120,26);
        bookname.setBounds(110,100,120,26);
        publish.setBounds(110,130,120,26);
        author.setBounds(110,170,120,26);
        isbn.setBounds(110,190,120,26);
        price.setBounds(110,220,120,26);
        button1.setBounds(60,60,60,30);
        button2.setBounds(60,250,60,26);
        //设置文本框的属性为不可编辑
        bookname.setEnabled(false);
        publish.setEnabled(false);
        author.setEnabled(false);
        isbn.setEnabled(false);
        price.setEnabled(false);
        //将控件添加到容器中
        this.add(jnumber);
        this.add(number);
        this.add(button1);
        this.add(jbookname);
        this.add(bookname);
        this.add(jpublish);
        this.add(publish);
        this.add(jauthor);
        this.add(author);
        this.add(jisbn);
        this.add(isbn);
        this.add(jprice);
        this.add(price);       
        this.add(button2);
//为button1增加监听
        button1.addActionListener(new ActionListener(){
         public void actionPerformed(ActionEvent e)
         {
         try{
     if(number.getText().toString().equals(""))
     JOptionPane.showMessageDialog(null, "编号不能为空","修改",JOptionPane.WARNING_MESSAGE);
     String sqlstr1;
     JdbcFiles conn=new JdbcFiles();
     sqlstr1="select number,bookname,publish,author,isbn,price from book where convert(nvarchar(255),number)='"+number.getText()+"'";
     ResultSet result=conn.executeQuery(sqlstr1);
        if(result.next()){
        {
       
        bookname.setText(result.getString("password"));
        publish.setText(result.getString("college"));
        author.setText(result.getString("subject"));
        isbn.setText(result.getString("grade"));
        price.setText(result.getString("name"));
    
        
        bookname.setEnabled(true);
        publish.setEnabled(true);
        author.setEnabled(true);
        isbn.setEnabled(true);
        price.setEnabled(true);
        }
     }
        else
        JOptionPane.showMessageDialog(null, "当前没有该书信息","修改",JOptionPane.WARNING_MESSAGE);
     }catch (ClassNotFoundException ce) {
     System.out.println("SQLException:" + ce.getMessage());     } catch (SQLException ex) {
     System.out.println(ex);     } catch (Exception s) {
     s.printStackTrace();
     }     }
    
     });
      
      //为button2增加监听
button2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
try{

String sqlstr2="update book set bookname='"+bookname.getText()+"',publish='"+publish.getText()+"',author='"+author.getText()+"',isbn='"+isbn.getText()+"',price='"+price.getText()+"' where convert(nvarchar(255),number)='"+number.getText()+"'";
int k=-1;
JdbcFiles conn1=new JdbcFiles();
k=conn1.insert(sqlstr2);
if(number.getText().toString().equals(""))
JOptionPane.showMessageDialog(null, "编号不能为空","修改",JOptionPane.WARNING_MESSAGE);
else
if(bookname.getText().toString().equals(""))
JOptionPane.showMessageDialog(null, "书名不能为空","修改",JOptionPane.WARNING_MESSAGE);
else
if(publish.getText().toString().equals(""))
JOptionPane.showMessageDialog(null, "出版社不能为空","修改",JOptionPane.WARNING_MESSAGE);
else
if(author.getText().toString().equals(""))
JOptionPane.showMessageDialog(null, "作者不能为空","修改",JOptionPane.WARNING_MESSAGE);
else
if(isbn.getText().toString().equals(""))
JOptionPane.showMessageDialog(null, "ISBN不能为空","修改",JOptionPane.WARNING_MESSAGE);
else
if(price.getText().toString().equals(""))
JOptionPane.showMessageDialog(null, "价格不能为空","修改",JOptionPane.WARNING_MESSAGE);


else if (k > -1)
{
JOptionPane.showMessageDialog(null, "修改成功！", "修改",JOptionPane.WARNING_MESSAGE);
conn1.close();
} else
JOptionPane.showMessageDialog(null, "修改失败！", "修改",JOptionPane.WARNING_MESSAGE);

}catch(ClassNotFoundException ce){
System.out.println("SQLException:"+ce.getMessage());

}catch(SQLException ex){
System.out.println(ex);

}catch(Exception s){
s.printStackTrace();
}
}
});
setSize(250,380);
this.setVisible(true);
}

  public static void main(String[] args)
  {
  UpdateBook app1=new UpdateBook();
  
  
  }
}