java.sql.SQLException: Column not found怎么解决
数据库：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.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.*;
public class DelBook 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[];
public DelBook()
{
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("删除");
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(110,160,120,26);
isbn.setBounds(110,190,120,26);
price.setBounds(110,220,120,26);
button1.setBounds(60,60,60,30);
button2.setBounds(60,250,60,26);
bookname.setEnabled(false);
publish.setEnabled(false);
author.setEnabled(false);
isbn.setEnabled(false);
price.setEnabled(false);
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);
button1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
/*if(number.getText().toString().equals(""))
JOptionPane.showMessageDialog(null, "编号不能为空!","修改",JOptionPane.WARNING_MESSAGE);
*/
try{
if(number.getText().toString().equals(""))
JOptionPane.showMessageDialog(null, "图书编号不能为空","删除",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("booknamer"));
publish.setText(result.getString("publish"));
author.setText(result.getString(" author"));
isbn.setText(result.getString("isbn"));
price.setText(result.getString("price"));
}
}
else
JOptionPane.showMessageDialog(null, "当前没有该书信息","删除",JOptionPane.WARNING_MESSAGE);
}catch (ClassNotFoundException ce) {
System.out.println("SQLException:" + ce.getMessage());
} catch (SQLException ex) {
System.out.println(ex);
} catch (Exception s) {
s.printStackTrace();
}
}
});
button2.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
try{
String sqlstr2="delete from book 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, "删除成功！", "删除",JOptionPane.WARNING_MESSAGE);
conn1.close();
} else
JOptionPane.showMessageDialog(null, "删除失败！", "删除",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)
{
DelBook app1=new DelBook();
}
} --------------------编程问答-------------------- 已解决！ --------------------编程问答-------------------- 恭喜
--------------------编程问答--------------------
看看，先了解一下
--------------------编程问答--------------------
我用java查询access数据库时用：String sql="SELECT Name FROM table1 where Age = (SELECT Age FROM table1 where Name='李四')";
结果出现：
姓名:李四java.sql.SQLException: Column not found
java.sql.SQLException: Column not found这个问题是怎么解决的啊？ --------------------编程问答-------------------- 这个异常表示你查询的某个列在表中找不到，比如Name或Age在表table1中没有
--------------------编程问答-------------------- 你表中列应该和数据库有对应的，有一个没有对应到数据库中的字段
补充：Java , Eclipse
