我想在JAVA中显示多行SQL 查询记录，该如何实现？谁能给我介绍一些JDBC的资料，小弟现在这鞠躬了！
我是个JAVA初学者，很多不懂，遇到问题没有良师益友的指点与讨论，一时半刻无法解决，欲哭无泪，谁愿意与我经常交流？（最好是用邮箱联系，我们公司不允许上QQ）;QQ是274375180（加我时注明：JAVA）!愿与同道中人携手共进！共讨JAVA！！！
我是个JAVA初学者，很多不懂，遇到问题没有良师益友的指点与讨论，一时半刻无法解决，欲哭无泪，谁愿意与我经常交流？（最好是用邮箱联系，我们公司不允许上QQ）;QQ是274375180（加我时注明：JAVA）!愿与同道中人携手共进！共讨JAVA！！！
----------------------------------------------
太概括了吧???
while (rs.next)
{
}
{
System.out.println(rs.getInt("mno")+rs.getString("mname")+rs.getString("sex")..
}
* 一个JTree的例子，可以实现点击节点事件，增加、删除节点
*//**
* @author [email protected]
*
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
public class JTreeTest2 { /**
* 定义控件
*/
JFrame frm=null;
JTree tree=null;
JScrollPane jspTree=null;
JPanel btnP=null,txtP=null;//btnP用于容纳按钮addbtn和delbtn，txtP用于容纳文本框txta
JTextArea txta=null;
JTextField childrentxt=null;
JButton delbtn=null,addbtn=null;
JLabel meslb=null;
public JTreeTest2() {
// TODO Auto-generated constructor stub
//构造函数
frm=new JFrame("JTree Test!");
Container cp=frm.getContentPane();
BorderLayout layout=new BorderLayout();
cp.setLayout(layout);
//创建树
DefaultMutableTreeNode root=new DefaultMutableTreeNode("选择...");
DefaultMutableTreeNode color=new DefaultMutableTreeNode("颜色");
DefaultMutableTreeNode white=new DefaultMutableTreeNode("白色");
DefaultMutableTreeNode black=new DefaultMutableTreeNode("黑色");
DefaultMutableTreeNode blue =new DefaultMutableTreeNode("蓝色");
DefaultMutableTreeNode paper=new DefaultMutableTreeNode("纸张");
DefaultMutableTreeNode A3=new DefaultMutableTreeNode("A3纸");
DefaultMutableTreeNode A4=new DefaultMutableTreeNode("A4纸");
DefaultMutableTreeNode A5=new DefaultMutableTreeNode("A5纸");
root.add(color);
color.add(white);
color.add(black);
color.add(blue);
paper.add(A3);
paper.add(A4);
paper.add(A5);
root.add(paper);
tree=new JTree(root);
tree.addMouseListener(new TreeMouseLis());
jspTree=new JScrollPane(tree);
txta=new JTextArea();
txta.setSize(300,100);
delbtn=new JButton("删除");
delbtn.setSize(60,30);
addbtn=new JButton("添加");
addbtn.setSize(60,30);
btnP=new JPanel();
btnP.setLayout(layout);
btnP.add(addbtn,BorderLayout.CENTER);
btnP.add(delbtn,BorderLayout.CENTER);
addbtn.addActionListener(new ActionLis());
delbtn.addActionListener(new ActionLis());
meslb=new JLabel("增加节点");
childrentxt=new JTextField();
childrentxt.setSize(80,30);
txtP=new JPanel();
txtP.add(meslb,BorderLayout.EAST);
txtP.add(childrentxt,BorderLayout.CENTER);
cp.add(tree,layout.EAST);
cp.add(txta,layout.NORTH);
cp.add(txtP,layout.CENTER);
cp.add(btnP,layout.SOUTH); frm.setVisible(true);
frm.setSize(500,400);
frm.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
}
//定义按钮处理事件
class ActionLis implements ActionListener
{
public void actionPerformed(ActionEvent ex)
{
if((JButton)ex.getSource()==addbtn)//添加按钮事件
{
txta.setText("添加一个节点");
}
else if((JButton)ex.getSource()==delbtn)//删除按钮事件
{
txta.setText("删除一个节点");
}
}
}
//定义鼠“标按”下事件
class TreeMouseLis extends MouseAdapter//选择节点事件
{
public void mousePressed(MouseEvent mex)
{
JTree tree=(JTree)mex.getSource();
int clickRow=tree.getRowForLocation(mex.getX(),mex.getY());
if(clickRow!=-1)
{
TreePath treePath=tree.getPathForRow(clickRow);
TreeNode treeNode=(TreeNode)treePath.getLastPathComponent();//什么意思？
txta.setText("你选择的是："+treeNode);
}
}
} /**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
new JTreeTest2(); }}
运行以上代码，奇怪的是只显示一个窗口，其他控件不显示，谁能帮我解决啊？？？？
public class DbTest
{ private Connection conn=null;
private ResultSet rs=null;
private Statement stm=null;
public DbTest(){}
public void openOdbcDb(String dsnn,String user,String password)
{try{
String url="jdbc:odbc:"+dsnn;
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
conn=DriverManager.getConnection(url,user,password);
}catch(Exception e){System.err.println("aq.executeQuery: " + e.getMessage());}
}
public void openJdbcDb(String dsnn)
{openJdbcDb(dsnn,"sa","sa");
}
public void openJdbcDb(String dsnn,String user,String password)
{try{Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver").newInstance();
String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName="+dsnn;
conn= DriverManager.getConnection(url,user,password);
}catch(Exception e){System.err.println("aq.executeQuery: " + e.getMessage());}
}
public ResultSet executeQuery(String sql)
{rs=null;
try{
stm=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
rs=stm.executeQuery(sql);
}catch(Exception e){System.err.println("aq.executeQuery: " + e.getMessage());}
return rs;
}
public void executeUpdate(String sql)
{ try{
stm=conn.createStatement();
stm.executeUpdate(sql);
}catch(Exception e){System.err.println("aq.executeQuery: " + e.getMessage());}
}
public void closeDb()
{if(rs!=null)
{try{rs.close();
rs=null;
}catch(Exception e){}
}
if(stm!=null)
{try{stm.close();
stm=null;
}catch(Exception e){}
}
if(conn!=null)
{try{
conn.close();
conn=null;
}
catch(Exception e){}
}
}
public static void main(String [] args)throws Exception
{DbTest test=new DbTest();
test.testDb("select * from liuyan_tb join fuzhuang_tb on liuyan_tb.ID=fuzhuang_tb.ID");
}
public void testDb(String sql)throws Exception
{ ResultSet rst=null;
openJdbcDb("clother");
System.out.println(sql);
rst=executeQuery(sql);
for(int j=1; j<=rst.getMetaData().getColumnCount(); j++)
{System.out.print(rst.getMetaData().getColumnName(j)+" ");}
System.out.println("");
while (rst.next())
{ for(int j=1; j<=rst.getMetaData().getColumnCount(); j++)
{
System.out.print( rst.getObject(j)+" ");
}
System.out.println("");
}
closeDb();
}
}
JDK里有源码的。
while(rs.next()){
System.out.println(rs.getString(1));
}
而不是rs.next ,应该是是有括号的