editscore.java~9~

java语言写的

package scoremis;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.table.*;
import java.sql.*;
import java.util.*;

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2007</p>
 * <p>Company: </p>
 * @于二坤
 * @version 1.0
 */

public class EditScore extends JFrame{
  String kc,bj,xq;
  JPanel p=new JPanel();
  JLabel l1=new JLabel("课程");
  JComboBox course=new JComboBox();
  JLabel l2=new JLabel("班级");
  JComboBox tgreade=new JComboBox();
  JLabel l3=new JLabel("学期");
  JComboBox term=new JComboBox();
  JButton sure=new JButton("查询");
  JButton xgai=new JButton("修改");
  JButton tijiao=new JButton("提交");
  ResultSet rs=null;
  Vector tempvector=new Vector(1,1);
  DefaultTableModel model=new DefaultTableModel();
  JTable dbtable=new JTable(model);
  JScrollPane jScrollPane1=new JScrollPane(dbtable);
  String tname,psd,sql="";
  public EditScore(String name,String psd) {
    try{
      tname=name;
      this.psd=psd;
      jbInit();
    } catch(Exception exception) {exception.printStackTrace();}
  }
  private void jbInit() throws Exception {  //添加各组件
    l1.setFont(new java.awt.Font("Dialog", 0, 12));
    course.setFont(new java.awt.Font("Dialog", 0, 12));
    l2.setFont(new java.awt.Font("Dialog", 0, 12));
    tgreade.setFont(new java.awt.Font("Dialog", 0, 12));
    l3.setFont(new java.awt.Font("Dialog", 0, 12));
    term.setFont(new java.awt.Font("Dialog", 0, 12));
    sure.setFont(new java.awt.Font("Dialog", 0, 12));
    xgai.setFont(new java.awt.Font("Dialog", 0, 12));
    tijiao.setFont(new java.awt.Font("Dialog", 0, 12));
    p.add(l1);p.add(course);p.add(l2);p.add(tgreade);p.add(l3);p.add(term);
    p.add(sure);p.add(xgai);p.add(tijiao);
    this.getContentPane().add(p,"North");
    this.getContentPane().add(jScrollPane1,"Center");
    sure.addActionListener(new chaxun());
    xgai.addActionListener(new chaxun());
    tijiao.addActionListener(new chaxun());
    model.addColumn("学号");
    model.addColumn("姓名");
    model.addColumn("成绩");
    course.addItem("请选择课程");
    tgreade.addItem("请选择班级");
    term.addItem("请选择学期");
    sql="select cname,Cgreade from T_C,teacher where T_C.tID=teacher.ID and teacher.name='"+tname+"'";
    try{        //给 课程 班级 添加项目
      dbconn db=new dbconn();
      rs=db.Query(sql);
      while(rs.next()) {
        course.addItem(rs.getString(1));
        tgreade.addItem(rs.getString(2));
      }
      sql="select distinct Term from T_C,teacher where T_C.tID=teacher.ID and teacher.name='"+tname+"'";
      rs=db.Query(sql);   //给学期添加项目
      while(rs.next())
        term.addItem(rs.getString(1));
    }catch(Exception er) {System.out.println(er.toString());}
  }
  class chaxun implements ActionListener{
    public void actionPerformed(ActionEvent e){
      dbconn db=new dbconn();
      kc=(String)course.getSelectedItem();
      bj=(String)tgreade.getSelectedItem();
      xq=(String)term.getSelectedItem();
      if(e.getSource()==sure){ //处理 查询 事件
        int j=model.getRowCount();    //删除表中原有数据
        if(j>0){
          for(int i=0;i<j;i++)
            model.removeRow(0);
        }
        sql="select SID,Sname,score from S_C where Tgreade='"+bj+"' and Cname='"+kc+"' and Term='"+xq+"'";
        try{
          rs=db.Query(sql);
          int i=0;
          while(rs.next()){
            i++;
            tempvector=new Vector(1,1);
            tempvector.add(rs.getString(1));
            tempvector.add(rs.getString(2));
            //tempvector.add(rs.getFloat(3));
            model.addRow(tempvector);
          }
          if(i==0)
            JOptionPane.showMessageDialog(null,"该门课程成绩未录入,请录入成绩!");
            dbtable.setEnabled(false);
        }catch(Exception e2) {System.out.print(e2.toString());}
      }else if(e.getSource()==xgai) {   //处理 修改 事件
        dbtable.setEnabled(true);
      }else if(e.getSource()==tijiao) {  //处理 提交 事件
        int n=model.getRowCount();
        PreparedStatement updatestmt;
        sql="update S_C set score=? where SID=? and Term='"+xq+"'";
        try{
          if(model.getValueAt(n-1,2)!=null){
            updatestmt=db.conn.prepareStatement(sql);
            for(int i=0;i<n;i++){
              updatestmt.setString(2,(String)model.getValueAt(i,0));
              updatestmt.setFloat(1,Float.parseFloat((String)model.getValueAt(i,2)));
              updatestmt.executeUpdate();
            }
            JOptionPane.showMessageDialog(null,"修改成功!");
          }
        }catch(Exception e3) {}
      }
    }
  }
}