数据库应用-java+sqlserver（三）CourseList

CourseList:

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.sql.*;
import javax.swing.DefaultCellEditor;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;

public class CourseList extends JPanel implements ActionListener
{
    int count=0;//可供选择的课程数
    MyTable table1;
    JTable table2;
    TableColumnModel tcm;
    JButton button;
    CourseList()
    {
        setLayout(new BorderLayout());
        button=new JButton("确定");
        button.addActionListener(this);
        JPanel p=new JPanel();
        p.add(button);
        table1=new MyTable();
        JTable table2=initTable(table1);
        JScrollPane sp=new JScrollPane(table2);
        add(sp,BorderLayout.CENTER);
        add(p,BorderLayout.SOUTH);
    }
    private JTable initTable(JTable table) {   
        DefaultTableModel dtm = new DefaultTableModel(   
            new Object [] {"","课程编号","课程名称","学分","任课教师","教师职称","上课地点","已选人数"},0);   
        SqlManager DBm=SqlManager.createInstance();
        DBm.connectDB();
        String sql="exec AllCourse";//所有选修课，如果选课人数没有达到5时设置MyTable.b=true;
        ResultSet rs=DBm.executeQuery(sql);
        try{
            while(rs.next())
            {
                dtm.addRow(new Object[] {new Boolean(false),rs.getString(1),rs.getString(2),
                        rs.getString(3),rs.getString(4),rs.getString(5),rs.getString(6),rs.getString(7)});
                count++;
            }
            rs.close();
        }catch(SQLException e){
            e.printStackTrace();
        }
        DBm.closeDB();
        table.setModel(dtm);   
        TableColumnModel tcm = table.getColumnModel();   
        tcm.getColumn(0).setCellEditor(new DefaultCellEditor(new JCheckBox()));   
        tcm.getColumn(0).setCellRenderer(new MyTableRenderer());
        tcm.getColumn(0).setPreferredWidth(20);   
        tcm.getColumn(0).setWidth(20);   
        tcm.getColumn(0).setMaxWidth(20);   
        return table;   
    }
    
    public void actionPerformed(ActionEvent e)
    {
        if(e.getSource()==button)
        {
            if(selectcourse()>0)
            {
                JOptionPane.showMessageDialog(this,"选课成功\n点击\"确定\"查看以选课程",
                        "选课成功",JOptionPane.INFORMATION_MESSAGE);
                ChooseList.updateTable();
                StuPanel.card.show(StuPanel.pCenter, "已选课程");
            }
        }
    }
    public int selectcourse()
    {
        int selectedCount=ChooseList.getSelectedCount();
        int a=xianzhi();
        int c=0;
        String[] courseID=new String[selectedCount];
        if(selectedCount==3)
        {
            JOptionPane.showMessageDialog(this,"选课数目不能超过3门，你已经选择了3门\n点击\"确定\"查看已选课程",
                    "警告",JOptionPane.WARNING_MESSAGE);
            ChooseList.updateTable();
            StuPanel.card.show(StuPanel.pCenter, "已选课程");
            return c ;
        }
        else{
            if(a+selectedCount>3)
            {
                JOptionPane.showMessageDialog(this,"选课数目不能超过3门，你已经选择了"+selectedCount+"门\n点击\"确定\"查看以选课程",
                        "警告",JOptionPane.WARNING_MESSAGE);
                ChooseList.updateTable();
                StuPanel.card.show(StuPanel.pCenter, "已选课程");
                return c;
            }
            else
            {//不能选重复了
                String sql="exec SelectedCourse'"+Logon.userid+"'";
                //System.out.println(sql+"不能选重复了");
                SqlManager DBm=SqlManager.createInstance();
                DBm.connectDB();
                ResultSet rs=DBm.executeQuery(sql);
                try{
                    int i=0;
                    while(rs.next()){
                        courseID[i]=rs.getString(1).trim();
                        System.out.println(courseID[i]+"changdu");
                    }
                    rs.close();
                }catch(SQLException e){
                    e.printStackTrace();
                    return c;
                }
                DBm.closeDB();
                for(int i=0;i0)return false;   
        else return true;
    }   
}
class MyTableRenderer extends JCheckBox implements TableCellRenderer 
{
    public Component getTableCellRendererComponent( JTable table,   
            Object value,   
            boolean isSelected,   
            boolean hasFocus,   
            int row,   
            int column ) {   
        Boolean b = (Boolean) value;   
        this.setSelected(b.booleanValue());   
        return this;   
    }   
}