parameterset.java

来自「综合测评管理系统——完成班级的综合测评工作」· Java 代码 · 共 304 行

import java.sql.*; 
import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 
import java.util.*; 

public class ParameterSet extends JFrame{
	private Connection dbConn;
	private PreparedStatement ps;
	private ResultSet rs;
	
	private JTable table;
	Container c=getContentPane();
	
	public ParameterSet(){
		super("参数设置");
		final String dbURL="jdbc:sqlserver://localhost:1433; DatabaseName=sample";
		final String username="sa"; 
		final String password="2005"; 
		//加载驱动程序以连接数据库
		try{
			Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
			dbConn=DriverManager.getConnection(dbURL,username,password);
		}catch(ClassNotFoundException cnfex){
			System.err.println("装载 JDBC/ODBC 驱动程序失败。");
			cnfex.printStackTrace();
			System.exit(1); // terminate program
		}catch(SQLException sqlex){
			System.err.println( "无法连接数据库" );
			sqlex.printStackTrace();
			System.exit(1); // terminate program
		}
		
		
		JPanel topPanel = new JPanel();
		GridBagLayout lay=new GridBagLayout();
		GridBagConstraints constraints=new GridBagConstraints();
		topPanel.setLayout(lay);
		JButton modify_button=new JButton("修改");
	  JButton exit_button=new JButton("退出");
	  JLabel year_label=new JLabel("学年: ");
	  String[] yearStr={"2006-2007","2007-2008","2008-2009","2009-2010"};
	  final JComboBox year_combobox=new JComboBox(yearStr);
	  
	  JLabel basic_label=new JLabel("基本素质比率(F1): ");
	  final JTextField basic_textfield=new JTextField();
	  JLabel grade_label=new JLabel("学生成绩比率(F2): ");
	  final JTextField grade_textfield=new JTextField();
	  JLabel colligate_label=new JLabel("综合素质比率(F3): ");
	  final JTextField colligate_textfield=new JTextField();
	  
	  constraints.anchor=GridBagConstraints.CENTER;
	     
	  constraints.gridx=0;
	  constraints.gridy=0;
	  constraints.weightx=1;
	  constraints.weighty=1;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.NONE;
	  constraints.anchor=GridBagConstraints.EAST;
	  topPanel.add(basic_label,constraints);
	      
	  constraints.gridx=1;
	  constraints.gridy=0;
	  constraints.weightx=1;
	  constraints.weighty=2;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.BOTH;
	  constraints.anchor=GridBagConstraints.CENTER;
	  topPanel.add(basic_textfield,constraints);
	     
	  constraints.gridx=0;
	  constraints.gridy=1;
	  constraints.weightx=1;
	  constraints.weighty=1;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.NONE;
	  constraints.anchor=GridBagConstraints.EAST;
	  topPanel.add(grade_label,constraints);
	     
	  constraints.gridx=1;
	  constraints.gridy=1;
	  constraints.weightx=1;
	  constraints.weighty=2;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.BOTH;
	  constraints.anchor=GridBagConstraints.CENTER;
	  topPanel.add(grade_textfield,constraints);
	      
	  /*constraints.gridx=2;
	  constraints.gridy=1;
	  constraints.weightx=1;
	  constraints.weighty=1;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.NONE;
	  constraints.anchor=GridBagConstraints.CENTER;
	  add(ok_button,constraints);*/
	  
	  constraints.gridx=0;
	  constraints.gridy=2;
	  constraints.weightx=1;
	  constraints.weighty=1;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.NONE;
	  constraints.anchor=GridBagConstraints.EAST;
	  topPanel.add(colligate_label,constraints);
	   
	  constraints.gridx=1;
	  constraints.gridy=2;
	  constraints.weightx=1;
	  constraints.weighty=2;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.BOTH;
	  constraints.anchor=GridBagConstraints.CENTER;
	  topPanel.add(colligate_textfield,constraints);
	   
	  constraints.gridx=0;
	  constraints.gridy=3;
	  constraints.weightx=1;
	  constraints.weighty=1;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.NONE;
	  constraints.anchor=GridBagConstraints.EAST;
	  topPanel.add(year_label,constraints);
	   
	  constraints.gridx=1;
	  constraints.gridy=3;
	  constraints.weightx=1;
	  constraints.weighty=2;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.BOTH;
	  constraints.anchor=GridBagConstraints.CENTER;
	  topPanel.add(year_combobox,constraints);
	  
	  constraints.gridx=0;
	  constraints.gridy=4;
	  constraints.weightx=1;
	  constraints.weighty=1;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.NONE;
	  constraints.anchor=GridBagConstraints.CENTER;
	  topPanel.add(modify_button,constraints);
	  
	  constraints.gridx=1;
	  constraints.gridy=4;
	  constraints.weightx=1;
	  constraints.weighty=2;
	  constraints.gridwidth=1;
	  constraints.gridheight=1;
	  constraints.fill=GridBagConstraints.NONE;
	  constraints.anchor=GridBagConstraints.CENTER;
	  topPanel.add(exit_button,constraints);
	  
	  exit_button.addActionListener(new ActionListener(){
	  	public void actionPerformed(ActionEvent e){
	  		dispose();
	  	}
	  });
	  
	  modify_button.addActionListener(new ActionListener(){
	  	public void actionPerformed(ActionEvent e){
	  		String[] temp={"","",""};
	  		temp[0]=basic_textfield.getText();
	  		temp[1]=grade_textfield.getText();
	  		temp[2]=colligate_textfield.getText();
	  		float[] f={0,0,0};
	  		if(temp[0].equals("")||temp[1].equals("")||temp[2].equals("")){
	  			JOptionPane.showMessageDialog(new JFrame(),"空值,不合法","警告",JOptionPane.WARNING_MESSAGE);
	  			/*System.out.println("ceshi");
	  			f[0]=Float.parseFloat(temp[0]);
	  		  f[1]=Float.parseFloat(temp[1]);
	  		  f[2]=Float.parseFloat(temp[2]);
	  		  System.out.println(f[0]);*/
	  		}else{
	  			f[0]=Float.parseFloat(temp[0]);
	  		  f[1]=Float.parseFloat(temp[1]);
	  		  f[2]=Float.parseFloat(temp[2]);
	  		  if((f[0]+f[1]+f[2])==1.0){
	  		  	try{
	  		  		dbConn=DriverManager.getConnection(dbURL,username,password);
	  				  String updateStr="update colligate_rate set field1_rate=?,field2_rate=?,field3_rate=? WHERE Academic_year=?";
	  				  ps=dbConn.prepareStatement(updateStr);
	  				  ps.setString(1,basic_textfield.getText());
	  				  ps.setString(2,grade_textfield.getText());
	  				  ps.setString(3,colligate_textfield.getText());
	  				  ps.setString(4,(String)year_combobox.getSelectedItem());
	  				  ps.executeUpdate();
	  				  JOptionPane.showMessageDialog(new JFrame(),"修改成功","成功",JOptionPane.WARNING_MESSAGE);
	  				  getTable();
	  			  }catch(SQLException exc){
	  				  exc.printStackTrace();
	  			  }finally{
	  				  if(ps!=null)try{ps.close();}catch(SQLException ignore){}
	  				  if(dbConn!=null)try{dbConn.close();}catch(SQLException ignore){}
	  			  }
	  		  }else{
	  			  JOptionPane.showMessageDialog(new JFrame(),"比率之和不为1","警告",JOptionPane.WARNING_MESSAGE);
	  		  }
	  	  }
	  	}
	  });
	  
	  addWindowListener(new WindowAdapter(){
	  	public void windowClosing(WindowEvent e){
	  		dispose();
	  	}
	  });
	  
	  table = new JTable(); 
	  Container c = getContentPane(); 
	  c.setLayout( new BorderLayout() ); 
	  //将"topPanel"编辑框布置到 "NORTH" 
	  c.add( topPanel, BorderLayout.NORTH ); 
	  //将"table"编辑框布置到 "CENTER" 
	  c.add( table, BorderLayout.CENTER ); 
	  getTable(); 
	  setSize(500,270);
	  setResizable(false);
	  setVisible(true);
	  
	  Toolkit kit=Toolkit.getDefaultToolkit();
	  Dimension screenSize=kit.getScreenSize();
	  int width=screenSize.width;
	  int height=screenSize.height;
	  setLocation((width-getWidth())/2,(height-getHeight())/2);
	}
	
	private void getTable()
	{
		try{
			//执行SQL语句 
			String query="select Academic_year as '学年',field1_rate as '基本素质比率',field2_rate as '学习成绩比率',field3_rate as '综合能力比率' from colligate_rate";
			ps=dbConn.prepareStatement(query);
			rs=ps.executeQuery(); 
			//在表格中显示查询结果
			displayResultSet(rs);
		}catch(SQLException sqlex){
			sqlex.printStackTrace();
		}
	}
	
	private void displayResultSet(ResultSet rs)throws SQLException{
		//定位到达第一条记录
		boolean moreRecords = rs.next();
		//如果没有记录，则提示一条消息
		if (! moreRecords){
			JOptionPane.showMessageDialog( this,"结果集中无记录" );
			setTitle( "无记录显示" );
			return;
		}
		
		Vector columnHeads = new Vector();
		Vector rows = new Vector();
		try{
			//获取字段的名称
			ResultSetMetaData rsmd = rs.getMetaData();
			for ( int i = 1; i <= rsmd.getColumnCount(); ++i )
			  columnHeads.addElement( rsmd.getColumnName( i ) );
			//获取记录集
			do{
				rows.addElement( getNextRow( rs, rsmd ) );
			}while(rs.next());
			//在表格中显示查询结果
			table = new JTable( rows, columnHeads );
			JScrollPane scroller = new JScrollPane( table );
			
			c.remove(1);
			c.add( scroller, BorderLayout.CENTER );
			//刷新Table
			c.validate();
		}catch(SQLException sqlex){
			sqlex.printStackTrace();
		}
	} 
	
	private Vector getNextRow(ResultSet rs,ResultSetMetaData rsmd)throws SQLException{
		Vector currentRow = new Vector();
		for ( int i = 1; i <= rsmd.getColumnCount(); ++i )
		  currentRow.addElement( rs.getString( i ) );
		  //返回一条记录
		  return currentRow;
	}
	
	public void shutDown()
	{
		try{
			//断开数据库连接
			dbConn.close();
		}catch(SQLException sqlex){
			System.err.println( "Unable to disconnect" );
			sqlex.printStackTrace();
		} 
  }
}