新湖中宝黄伟图片:JAVA 关于数据库select问题

package com.student;

import com.student.DatabaseExecute;

public class A extends DatabaseExecute
{
void start()
{
//insert("insert into userinfo (name,age,sex) values ('leo',22,'a')");
java.util.Vector v = select("select * from userinfo");

for(int i=0;i<v.size();i++)
{
System.out.println(v.get(i));
}

}
public static void main(String[] args)
{
new A().start();
}
}
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package com.student;

import java.sql.*;
import java.util.Vector;

public class DatabaseExecute
{
private Connection con;
private Statement stat;
private ResultSet rs;
private void connection()
{
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con = DriverManager.getConnection("jdbc:odbc:sourceName", "", "");
stat = con.createStatement();
}
catch(Exception e)
{
e.printStackTrace();
}
}

public Vector select(String selectStr)
{
connection();

try
{
Vector v = new Vector();
rs=stat.executeQuery(selectStr);

while(rs.next())
{
v.add(rs.getString(1));//这里怎么写能让它显示出全部?而不是现在这样单独显示1列

}
rs.close();
return v;
}
catch(Exception ex)
{
ex.printStackTrace();
}
finally
{
try {
if(stat!=null)
stat.close();
if(con!=null)
con.close();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
return null;
}
}

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v.add(rs.getString(1));//这里怎么写能让它显示出全部?而不是现在这样单独显示1列