delete_duzhe.java

图书管理系统

        pack();
    }// </editor-fold>//GEN-END:initComponents

    public void Empty()
    {
        try{
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        }catch(ClassNotFoundException ex)
        {
            jlabelMessage.setText("SQL错:"+ex.getMessage());
        }
        try {
            String url="jdbc:odbc:driver={Microsoft Access Driver (*.mdb)};DBQ=sources\\data.mdb;pwd=shujuyuan";
            Connection con=DriverManager.getConnection(url);
            Statement st=con.createStatement();            
            ResultSet res=st.executeQuery("select libCard from XS");
            jcmblibCard.removeAllItems();
            while(res.next()) {
                 jcmblibCard.addItem(res.getString("libCard"));
            }
            st.close();
        } catch(Exception ex){
            JOptionPane.showConfirmDialog(null,"找不到数据库驱动程序！","Warning",JOptionPane.CLOSED_OPTION,JOptionPane.WARNING_MESSAGE);
            this.setVisible(false);
        }
        jcmblibCard.setSelectedItem(null);
        jtxtName.setText("");
        jtxtGender.setText("");
        jtxtBirth.setText("");
        jtxtMajor.setText("");
        jtxtBorrowNum.setText(""); 
        jlabelMessage.setText("选择读者借书证号，然后点击删除。");
        jtxtName.setEnabled(false);
        jtxtGender.setEnabled(false);
        jtxtBirth.setEnabled(false);        
        jtxtMajor.setEnabled(false);
        jtxtBorrowNum.setEnabled(false);
        jtxtName.setEnabled(false);
    }
    
    private void jbtnQuery_DuzheActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jbtnQuery_DuzheActionPerformed
// TODO 将在此处添加您的处理代码：
        jlabelMessage.setText("");
        jtxtName.setText("");
        jtxtGender.setText("");
        jtxtBirth.setText("");
        jtxtMajor.setText("");
        jtxtBorrowNum.setText("");
        String flag="",lc="";
        int flag2=0;
        try{
            Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
        } catch(ClassNotFoundException ex) {
            jlabelMessage.setText("SQL错:"+ex.getMessage());
        }
        try{            
//            Connection con=DriverManager.getConnection("jdbc:odbc:XSBOOK");
            String url="jdbc:odbc:driver={Microsoft Access Driver (*.mdb)};DBQ=sources\\data.mdb;pwd=shujuyuan";
            Connection con=DriverManager.getConnection(url);
            Statement st=con.createStatement();
            ResultSet rs=st.executeQuery("select * from XS");
            try{
                lc=new String((String)jcmblibCard.getSelectedItem());
            }catch(NullPointerException e){
                throw new NullPointerException();
            }
            if(lc.length()!=8) throw new ArithmeticException();
            jcmblibCard.removeItem(lc);
            jcmblibCard.setSelectedItem(null);
            while(rs.next())
                if(rs.getString("libCard").equals(lc))
                {
                    flag=new String(rs.getString("name"));
                    jtxtName.setText(flag);
                    jtxtMajor.setText(rs.getString("major"));
                    jtxtGender.setText(rs.getString("gender"));
                    jtxtBirth.setText(rs.getString("birth").substring(0, 10));
                    flag2=new Integer(Integer.parseInt(rs.getString("borrowNum")));
                    jtxtBorrowNum.setText(String.valueOf(flag2));
                }
            if(flag.length()<1) throw new ArrayIndexOutOfBoundsException();
            else if(flag2!=0)  throw new ArithmeticException();
            PreparedStatement ps=con.prepareStatement("delete from xs where libCard=?");
            ps.setString(1,lc);
            ps.executeUpdate();
            jlabelMessage.setText("成功删除 "+lc+" 的信息!");
        }catch(NullPointerException ex){
            jlabelMessage.setText("请选择图书证号!");
        }
        catch(ArithmeticException ex)
        {
            if(lc.length()<1) jlabelMessage.setText("图书证号不能为空！");
            else if(lc.length()!=8) jlabelMessage.setText("图书证号码不是8位！");
            else if(flag2!=0) jlabelMessage.setText("还有书未还，不能删除！");
        }
        catch(ArrayIndexOutOfBoundsException ex)
        {
            jlabelMessage.setText("此图书证号不存在！");
        }
        catch(Exception ex)
        {
            jlabelMessage.setText("删除失败!(可能连接数据库失败)");
        }
    }//GEN-LAST:event_jbtnQuery_DuzheActionPerformed
    
    /** Closes the dialog */
    private void closeDialog(java.awt.event.WindowEvent evt) {//GEN-FIRST:event_closeDialog
        setVisible(false);
        dispose();
    }//GEN-LAST:event_closeDialog

    private void jcmblibCardActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jcmblibCardActionPerformed
        // TODO add your handling code here:
        jtxtName.setText("");
        jtxtGender.setText("");
        jtxtBirth.setText("");
        jtxtMajor.setText("");
        jtxtBorrowNum.setText("");
        jlabelMessage.setText("选择读者借书证号，然后点击删除。");
    }//GEN-LAST:event_jcmblibCardActionPerformed
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Delete_Duzhe(new javax.swing.JFrame(), true).setVisible(true);
            }
        });
    }
    
    
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JComboBox jComboBox1;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JButton jbtnQuery_Duzhe;
    private javax.swing.JComboBox jcmblibCard;
    private javax.swing.JLabel jlabelMessage;
    private javax.swing.JTextField jtxtBirth;
    private javax.swing.JTextField jtxtBorrowNum;
    private javax.swing.JTextField jtxtGender;
    private javax.swing.JTextField jtxtMajor;
    private javax.swing.JTextField jtxtName;
    // End of variables declaration//GEN-END:variables
    
}