我学了一个月的java,老师让我们用swing做界面,数据库做后台,做一个简单的人事管理系统。
老师的方法是:先把数据读出来,放在arraylist中存着,然后对arraylist操作。
我想:能不能直接对数据库里的数据进行操作,就象delphi那样,但是做了几天,一直没成功。
想请教高手,我这种思路行不行?
有没有这样的例子。相关文章的网页也可以!!!
在这祝各位朋友新年快乐,万事如意!!!
谢谢!!
老师的方法是:先把数据读出来,放在arraylist中存着,然后对arraylist操作。
我想:能不能直接对数据库里的数据进行操作,就象delphi那样,但是做了几天,一直没成功。
想请教高手,我这种思路行不行?
有没有这样的例子。相关文章的网页也可以!!!
在这祝各位朋友新年快乐,万事如意!!!
谢谢!!
不过Swing还是够强大的,一般我用的是JBuilder里自带的dbSwing和dbExpress(都是Borland的东西,如果你做过Delphi or BCB,几乎不用学,呵呵)dbSwing中的Components完全继承自Swing中相应的Components,加上与dbExpress对应的数据库操作功能,简直是Swing做数据库C/S系统的不二选择,呵呵
具体的例子可以参看JBuilder 帮助文档中的例子,上手很快的。
@version 1.1 2004-08-22
@author Cay Horstmann
*/import com.sun.rowset.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
import javax.sql.rowset.*;/**
This program shows how to display the result of a
database query in a table.
*/
public class ResultSetTable
{
public static void main(String[] args)
{
JFrame frame = new ResultSetFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}/**
This frame contains a combo box to select a database table
and a table to show the data stored in the table
*/
class ResultSetFrame extends JFrame
{
public ResultSetFrame()
{
setTitle("ResultSet");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); /* find all tables in the database and add them to
a combo box
*/ tableNames = new JComboBox();
tableNames.addActionListener(new
ActionListener()
{
public void actionPerformed(ActionEvent event)
{
try
{
if (scrollPane != null) remove(scrollPane);
String tableName = (String) tableNames.getSelectedItem();
if (rs != null) rs.close();
String query = "SELECT * FROM " + tableName;
rs = stat.executeQuery(query);
if (scrolling)
model = new ResultSetTableModel(rs);
else
{
CachedRowSet crs = new CachedRowSetImpl();
crs.populate(rs);
model = new ResultSetTableModel(crs);
} JTable table = new JTable(model);
scrollPane = new JScrollPane(table);
add(scrollPane, BorderLayout.CENTER);
validate();
}
catch (SQLException e)
{
e.printStackTrace();
}
}
});
JPanel p = new JPanel();
p.add(tableNames);
add(p, BorderLayout.NORTH); try
{
conn = getConnection();
DatabaseMetaData meta = conn.getMetaData();
if (meta.supportsResultSetType(ResultSet.TYPE_SCROLL_INSENSITIVE))
{
scrolling = true;
stat = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
}
else
{
stat = conn.createStatement();
scrolling = false;
}
ResultSet tables = meta.getTables(null, null, null, new String[] { "TABLE" });
while (tables.next())
tableNames.addItem(tables.getString(3));
tables.close();
}
catch (IOException e)
{
e.printStackTrace();
}
catch (SQLException e)
{
e.printStackTrace();
} addWindowListener(new
WindowAdapter()
{
public void windowClosing(WindowEvent event)
{
try
{
if (conn != null) conn.close();
}
catch (SQLException e)
{
e.printStackTrace();
}
}
});
} /**
Gets a connection from the properties specified in
the file database.properties.
@return the database connection
*/
public static Connection getConnection()
throws SQLException, IOException
{
Properties props = new Properties();
FileInputStream in = new FileInputStream("database.properties");
props.load(in);
in.close(); String drivers = props.getProperty("jdbc.drivers");
if (drivers != null) System.setProperty("jdbc.drivers", drivers);
String url = props.getProperty("jdbc.url");
String username = props.getProperty("jdbc.username");
String password = props.getProperty("jdbc.password"); return DriverManager.getConnection(url, username, password);
} private JScrollPane scrollPane;
private ResultSetTableModel model;
private JComboBox tableNames;
private ResultSet rs;
private Connection conn;
private Statement stat;
private boolean scrolling; private static final int DEFAULT_WIDTH = 400;
private static final int DEFAULT_HEIGHT = 300;
}/**
This class is the superclass for the scrolling and the
caching result set table model. It stores the result set
and its metadata.
*/
class ResultSetTableModel extends AbstractTableModel
{
/**
Constructs the table model.
@param aResultSet the result set to display.
*/
public ResultSetTableModel(ResultSet aResultSet)
{
rs = aResultSet;
try
{
rsmd = rs.getMetaData();
}
catch (SQLException e)
{
e.printStackTrace();
}
} public String getColumnName(int c)
{
try
{
return rsmd.getColumnName(c + 1);
}
catch (SQLException e)
{
e.printStackTrace();
return "";
}
} public int getColumnCount()
{
try
{
return rsmd.getColumnCount();
}
catch (SQLException e)
{
e.printStackTrace();
return 0;
}
} public Object getValueAt(int r, int c)
{
try
{
rs.absolute(r + 1);
return rs.getObject(c + 1);
}
catch(SQLException e)
{
e.printStackTrace();
return null;
}
} public int getRowCount()
{
try
{
rs.last();
return rs.getRow();
}
catch(SQLException e)
{
e.printStackTrace();
return 0;
}
} private ResultSet rs;
private ResultSetMetaData rsmd;
}
以前也是用delphi的还是老实放在ArrayList里面吧
其实写个方法也不繁.这个是好习惯
要实现界面分离阿.以前写delphi也不管界面逻辑混在一起.觉得很爽.