JAVA课程设计——农村人口管理系统 D4 功能实现（户头增删改查）

上一篇，操作员页面设计

现在我们就来实现一下对户头的增删改查。

添加户头

增加户头页面设计：

增加户头功能设计

Host

显示户头

1.显示户头的页面设计

2.显示户头功能设计

删除户头

1.删除户头页面设计

2.删除户头功能设计

更新户头

1.更新户头界面设计

2.更新户头功能设计

添加户头

增加户头页面设计：

也就是AddHost函数里面具体内容：

AddHost(){setSize(650,300);setBorder(BorderFactory.createTitledBorder("增加户头"));t1 = new JTextField(10);l1=new Label("请输入身份证号");t2 = new JTextField(10);l2=new Label("请输入姓名");t3 = new JTextField(10);l3=new Label("请输入性别");t4 = new JTextField(10);l4=new Label("请输入家庭住址");t5 = new JTextField(10);l5=new Label("请输入宅基地大小");t6 = new JTextField(10);l6=new Label("请输入手机号");t7 = new JTextField(10);l7=new Label("请输入贫困类");setLayout(new GridLayout(5,2));JPanel p1 = new JPanel();JPanel p2 = new JPanel();JPanel p3 = new JPanel();JPanel p4 = new JPanel();JPanel p5 = new JPanel();JPanel p6 = new JPanel();JPanel p7 = new JPanel();p1.add(l1);p2.add(l2);p3.add(l3);p4.add(l4);p5.add(l5);p6.add(l6);p7.add(l7);p1.add(t1);p2.add(t2);p3.add(t3);p4.add(t4);p5.add(t5);p6.add(t6);p7.add(t7);add(p1);add(p2);add(p3);add(p4);add(p5);add(p6);add(p7);JPanel p8 = new JPanel();bOK = new JButton("增加");bOK.addActionListener(this);p8.add(bOK); add(p8);}

当我们把页面布置完毕，现在就是实现点击监听方法，怎么样才能把文本框的内容输入到数据库中：

增加户头功能设计

 @Overridepublic void actionPerformed(ActionEvent e) {Object obj = e.getSource();if(obj == bOK) {String hid = this.t1.getText();String hname = this.t2.getText();String hsex = this.t3.getText();String h_haddress = this.t4.getText();String hraea = this.t5.getText();String h_phone = this.t6.getText();String hpleve = this.t7.getText();Connection connection=myDataBase.getConnection();//与数据库建立联系String sql = "insert into t_host(hid,hname,hsex,h_haddress,harear,h_phone,hpleve) values("+hid+",'"+hname+"','"+hsex+"','"+h_haddress+"','"+hraea+"','"+h_phone+"','"+hpleve+"')";try {PreparedStatement ps=connection.prepareStatement(sql);System.out.println(sql);ps.execute(sql);//执行Sql语句boolean i=ps.execute("select * from t_host where hid=("+hid+")");//判断之前的数据有没有插入到数据库myDataBase.close(ps,connection);if (i)JOptionPane.showMessageDialog(null,"添加成功！","系统信息",JOptionPane.INFORMATION_MESSAGE);}catch(Exception e1) {System.err.println(e1.getMessage());JOptionPane.showMessageDialog(null,"添加失败！","系统信息",JOptionPane.INFORMATION_MESSAGE);}}}

上面的添加功能我当初是作为一个测试来写，所以它的功能就写在了添加的页面设计中去，后期为了方便管理和美观下面三个功能，我单独拿出来，把具体实现，放在了OperatorDao中。

所以在实现下面三个功能时，我们先建立一个类，这个类的字段和属性要根据你设计的数据库的字段和属性来设置。

Host

public class Host {private String hid;private String hname;private String hsex;private String h_haddress;private Double harear;private Integer h_phone;private Integer hnumber;private String hpleve;public String getHid() {return hid;}public void setHid(String hid) {this.hid = hid;}public String getHname() {return hname;}public void setHname(String hanme) {this.hname = hanme;}public String getHsex() {return hsex;}public void setHsex(String hsex) {this.hsex = hsex;}public String getH_haddress() {return h_haddress;}public void setH_haddress(String h_haddress) {this.h_haddress = h_haddress;}public Double getHarear() {return harear;}public void setHarear(Double harear) {this.harear = harear;}public Integer getH_phone() {return h_phone;}public void setH_phone(Integer h_phone) {this.h_phone = h_phone;}public Integer getHnumber() {return hnumber;}public void setHnumber(Integer hnumber) {this.hnumber = hnumber;}public String getHpleve() {return hpleve;}public void setHpleve(String hpleve) {this.hpleve = hpleve;}@Overridepublic String toString() {return "Host{" +"hid='" + hid + '\'' +", hanme='" + hname + '\'' +", hsex='" + hsex + '\'' +", h_haddress='" + h_haddress + '\'' +", harear=" + harear +", h_phone=" + h_phone +", hnumber=" + hnumber +", hpleve='" + hpleve + '\'' +'}';}

显示户头

1.显示户头的页面设计

ShowHost内部代码

 ShowHost(List<Host> list) {setSize(650, 600);setBorder(BorderFactory.createTitledBorder("显示户头"));String[] index = {"身份证号", "姓名", "性别", "家庭住址", "在基地大小", "电话", "家庭人口", "贫苦等级"};Object[][] data = new Object[list.size()][index.length];//向data添加数据for (int i = 0; i < list.size(); i++) {Host host = list.get(i);data[i][0] = host.getHid();data[i][1] = host.getHname();data[i][2] = host.getHsex();data[i][3] = host.getH_haddress();data[i][4] = host.getHarear();data[i][5] = host.getH_phone();data[i][6] = host.getHnumber();data[i][7] = host.getHpleve();}//添加一个表格DefaultTableModel dtm = new DefaultTableModel(data, index);JTable table = new JTable(dtm);table.setBackground(Color.PINK);//设置table的高度和宽度table.setPreferredScrollableViewportSize(new Dimension(650, 500));table.setFillsViewportHeight(true);//5，给表格设置滚动条JScrollPane jScrollPane = new JScrollPane();jScrollPane.setViewportView(table);//添加滚条add(jScrollPane, BorderLayout.SOUTH);}

2.显示户头功能设计

1.这是在OperatorDao中的功能。接下来的功能也是类似的。

  //获取数据以结果集返回,查找户头数据，public static List<Host> getData() {String sql = "select * from t_host";PreparedStatement ps;LinkedList<Host> list = null;try {Connection connection = myDataBase.getConnection();ps = connection.prepareStatement(sql);ResultSet result = ps.executeQuery();//获得结果集list = new LinkedList<>();while (result.next()) {Host host = new Host();host.setHid(result.getString("hid"));host.setHname(result.getString("hname"));host.setHsex(result.getString("hsex"));host.setH_haddress(result.getString("h_haddress"));host.setHarear(result.getDouble("harear"));host.setH_phone(result.getInt("h_phone"));host.setHnumber(result.getInt("hnumber"));host.setHpleve(result.getString("hpleve"));list.add(host);}myDataBase.close(ps, connection);} catch (SQLException e) {e.printStackTrace();}return list;}

2.在OperatorJF也就是管理员内部加上这个。添加户头在上一篇介绍操作员界面时举过例子，所以不在概述，后面的删除和修改也是和下面类似，我将不在一一举例。

 //显示户头操作面板jm2.addActionListener(e -> {jc.removeAll();jc.repaint();//重新绘制jc.add(new ShowHost(OperatorDao.getData()));//添加新面板jc.revalidate();//重新布局});

删除户头

1.删除户头页面设计

public class DeleteHost extends Jcenter{DeleteHost(){setSize(650,300);setBorder(BorderFactory.createTitledBorder("删除户头"));Label la=new Label("温馨提示删除户头前，请先将该户头下的全部家庭成员修改或者移除");add(la);JPanel p1=new JPanel();Label ll=new Label("输入要删除的户主身份证号：");JTextField f1=new JTextField(4);p1.add(ll);p1.add(f1);add(p1);Button bOK=new Button("确认");add(bOK);bOK.addActionListener(e -> {String hid=f1.getText();OperatorDao.deleteById(hid);});}
}

2.删除户头功能设计

//通过Id删除数据public static void deleteById(String hid) {String sql = "delete from t_host where hid=?";//类似于一个占位符PreparedStatement ps;try {Connection connection = myDataBase.getConnection();ps = connection.prepareStatement(sql);ps.setString(1, hid);//参数标记从 1 开始编号, 通常指的是第一个“？”ps.executeUpdate();int f = ps.executeUpdate();if (f > 0) {JOptionPane.showMessageDialog(null, "没有删除数据");} else {JOptionPane.showMessageDialog(null, "成功删除数据");}ps.close();connection.close();} catch (SQLException e) {e.printStackTrace();}}

更新户头

更新户头我设计的是用ID查找对应户头信息，然后把被查找到的户头信息显示在文本框中，再对文本框中内容进行修改，再提交。（之前有位读者，跟我反映了一下身份证号无法修改的问题，我现在把之前的问题解决了一下，如果还有其他的小毛病欢迎大家私聊我）

1.更新户头界面设计

public class UpdateHost extends Jcenter  {JButton bOK;JTextField t1,t2,t3,t4,t5,t6,t7,t8;Label l1,l2,l3,l4,l5,l6,l7,l8;UpdateHost(){setSize(650,300);setBorder(BorderFactory.createTitledBorder("修改户头"));Label ll=new Label("请输入要修改的户主身份证号：");JTextField jt=new JTextField(10);Button bc=new Button("查找");JPanel jp=new JPanel();jp.add(ll);jp.add(jt);jp.add(bc);add(jp);t1 = new JTextField(10);l1=new Label("身份证号");t2 = new JTextField(10);l2=new Label("姓名");t3 = new JTextField(10);l3=new Label("性别");t4 = new JTextField(10);l4=new Label("家庭住址");t5 = new JTextField(10);l5=new Label("宅基地大小");t6 = new JTextField(10);l6=new Label("手机号");t7=new JTextField(10);l7=new Label("家庭人口");t8 = new JTextField(10);l8=new Label("贫困等级" );setLayout(new GridLayout(5,2));JPanel p1 = new JPanel();JPanel p2 = new JPanel();JPanel p3 = new JPanel();JPanel p4 = new JPanel();JPanel p5 = new JPanel();JPanel p6 = new JPanel();JPanel p7 = new JPanel();JPanel p8 = new JPanel();p1.add(l1);p2.add(l2);p3.add(l3);p4.add(l4);p5.add(l5);p6.add(l6);p7.add(l7);p8.add(l8);p1.add(t1);p2.add(t2);p3.add(t3);p4.add(t4);p5.add(t5);p6.add(t6);p7.add(t7);p8.add(t8);add(p1);add(p2);add(p3);add(p4);add(p5);add(p6);add(p7);add(p8);JPanel p9 = new JPanel();bOK = new JButton("确认");p9.add(bOK); add(p9);bc.addActionListener(e->{ //通过ID查找户头然后，将查找到的信息写在文本框中Connection connection = myDataBase.getConnection();PreparedStatement ps;try {ps = connection.prepareStatement("select * from t_host where hid=?");ps.setString(1, jt.getText());ResultSet result = ps.executeQuery();while (result.next()) {t1.setText(result.getString("hid"));t2.setText(result.getString("hname"));t3.setText(result.getString("hsex"));t4.setText(result.getString("h_haddress"));t5.setText(String.valueOf(result.getDouble("harear")));t6.setText(String.valueOf(result.getInt("h_phone")));t7.setText(String.valueOf(result.getInt("hnumber")));t8.setText(result.getString("hpleve"));}myDataBase.close(ps, connection);} catch (SQLException ex) {ex.printStackTrace();}});bOK.addActionListener(e -> {//修改文本框内容再提交String hid=t1.getText();String hname=t2.getText();String hsex=t3.getText();String h_haddress=t4.getText();Double harear= Double.valueOf(t5.getText());Integer h_hpone= Integer.valueOf(t6.getText());Integer hnumber=Integer.valueOf(t7.getText());String hpleve=t8.getText();String hidd=jt.getText();//修复之前身份证号无法更新问题，获取一个旧的Hid，用来进行查找Host host=new Host();host.setHid(hid);host.setHname(hname);host.setHsex(hsex);host.setH_haddress(h_haddress);host.setHarear(harear);host.setH_phone(h_hpone);host.setHnumber(hnumber);host.setHpleve(hpleve);try {OperatorDao.updateAll(host，hidd);} catch (SQLException ex) {ex.printStackTrace();}});}
}

2.更新户头功能设计

更新中根据id获得数据在文本框显示，这个功能也可以将其1写入到OperatorJF中，只不过本人比较摆烂，

所以就写在一起了。

  //通过Id更新数据public static void updateAll(Host h，String jt) throws SQLException {Connection connection = myDataBase.getConnection();PreparedStatement ps = connection.prepareStatement("update t_host set hid=?,hname=?,hsex=?,h_haddress=?,harear=?,h_phone=?,hnumber=?,hpleve=? where hid=?");ps.setString(1, h.getHid());ps.setString(2, h.getHname());ps.setString(3, h.getHsex());ps.setString(4, h.getH_haddress());ps.setDouble(5, h.getHarear());ps.setInt(6, h.getH_phone());ps.setInt(7, h.getHnumber());ps.setString(8, h.getHpleve());ps.setString(9,jt);//修复之前身份证号无法更新问题，第九位应该是旧的Hid，不然查找不到，也就无法更新int f = ps.executeUpdate();System.out.println(f);if (f > 0) {JOptionPane.showMessageDialog(null, "成功更新数据");} else {JOptionPane.showMessageDialog(null, "更新数据失败");}}

好了，户头的所有功能都已实现完毕，其他的增删改查功能也是类似。