java程式碼實現:增、刪、改、查
阿新 • • 發佈:2021-01-09
技術標籤:java
java員工資訊系統的增刪改查
java程式碼實現增刪改查其實並不難,有很多方法
我這裡就是舉個例子,方法千千萬,也不分好壞
寫出來能執行的都是好方法!!!
首先:
import java.sql.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
然後,程式碼主體內容如下:
public class Genggai implements ActionListener{ Connection con; Statement stmt; String sql; ResultSet rs; StringBuffer sb = new StringBuffer(); JTextField jtf2 = new JTextField("Tom",10); JTextField jtf3 = new JTextField(10); JTextField jtf4 = new JTextField(10); JTextField jtf7 = new JTextField(10); JTextField jtf5 = new JTextField(10); JTextField jtf6 = new JTextField(10); JTextField jtf8 = new JTextField(10); JTextField jtf9 = new JTextField(10); JTextArea jta10 = new JTextArea(50, 40); public void actionPerformed(ActionEvent e) { String str = e.getActionCommand(); if ("查詢".equals(str)) { searchEmp(); } else if ("增加".equals(str)) { addEmp(); } else if ("修改".equals(str)) { alterEmp(); } else if ("撤除".equals(str)) { deleteEmp(); } } Genggai() { createGUI(); connectToDataBase(); alterEmp(); } public Connection connectToDataBase() { System.out.println(con); return con; } public void searchEmp() { jta10.setText(""); try { stmt = con.createStatement(); sql = "select * from Mstar where chineseName=" + jtf2.getText().toLowerCase().trim() + "or id=" + jtf3.getText().toLowerCase().trim() + "or engName=" + jtf4.getText().toLowerCase().trim() + "or UNIT=" + jtf5.getText().toLowerCase().trim() + "or TEAM=" + jtf6.getText().toLowerCase().trim() + "or Phone=" + jtf7.getText().toLowerCase().trim() + "or region=" + jtf8.getText().toLowerCase().trim() + "or busStation=" + jtf9.getText().toLowerCase().trim(); stmt.executeQuery(sql); rs = stmt.getResultSet(); ResultSetMetaData meta = rs.getMetaData(); int cols = meta.getColumnCount(); while (rs.next()) { for (int i = 1; i <= cols; i++) { sb.append(" " + meta.getColumnName(i) + " ="); sb.append(rs.getString(i)); } sb.append("\n"); jta10.setText(sb.toString()); } } catch (SQLException e11) { e11.printStackTrace(); } } public void addEmp() { try { stmt = con.createStatement(); sql = "update Mstar values(" + jtf2.getText() + jtf4.getText() + ")"; int i = stmt.getUpdateCount(); if ((jtf2.getText() != null) && (jtf4.getText() != null)) { stmt.executeUpdate(sql); jta10.setText("新增記錄成功" + i + "條"); } else { jta10.setText("帶*號項為新增記錄時不能為空"); } } catch (SQLException e1) { e1.printStackTrace(); } } public void deleteEmp() { searchEmp(); try { stmt = con.createStatement(); sql = "delete from Mstar where chineseName=" + jtf2.getText().toLowerCase().trim() + "or id=" + jtf3.getText().toLowerCase().trim() + "or engName=" + jtf4.getText().toLowerCase().trim() + "or UNIT=" + jtf5.getText().toLowerCase().trim() + "or TEAM=" + jtf6.getText().toLowerCase().trim() + "or Phone=" + jtf7.getText().toLowerCase().trim() + "or region=" + jtf8.getText().toLowerCase().trim() + "or busStation=" + jtf9.getText().toLowerCase().trim(); stmt.executeUpdate(sql); int i = stmt.getUpdateCount(); jta10.setText("撤除操作成功" + i + "條"); } catch (SQLException e) { e.printStackTrace(); } } public void alterEmp() { searchEmp(); sql = "update Mstar set chineseName=" + jtf2.getText().toLowerCase().trim() + "and id=" + jtf3.getText().toLowerCase().trim() + "and engName=" + jtf4.getText().toLowerCase().trim() + "and UNIT=" + jtf5.getText().toLowerCase().trim() + "and TEAM=" + jtf6.getText().toLowerCase().trim() + "and Phone=" + jtf7.getText().toLowerCase().trim() + "and region=" + jtf8.getText().toLowerCase().trim() + "and busStation=" + jtf9.getText().toLowerCase().trim(); int i = 0; try { stmt.executeUpdate(sql); i = stmt.getUpdateCount(); } catch (SQLException e) { e.printStackTrace(); } jta10.setText("修改操作成功" + i + "條"); } public void createGUI() { JFrame jf = new JFrame("員工資訊管理系統"); jf.setLayout(new GridLayout(2, 1)); // jf.setLayout(new GridLayout(10,2)); JPanel jp00 = new JPanel(new GridLayout(5, 4)); JPanel jp1 = new JPanel(); JButton jb11 = new JButton("查詢"); jb11.addActionListener(this); JButton jb12 = new JButton("增加"); jb12.addActionListener(this); jp1.add(jb11); jp1.add(jb12); jp00.add(jp1); JPanel jp11 = new JPanel(); JButton jb111 = new JButton("修改"); jb111.addActionListener(this); JButton jb112 = new JButton("撤除"); jb112.addActionListener(this); jp11.add(jb111); jp11.add(jb112); jp00.add(jp11); JPanel jp2 = new JPanel(); JLabel jl2 = new JLabel("姓名 * "); jp2.add(jl2); jp2.add(jtf2); jp00.add(jp2); JPanel jp3 = new JPanel(); JLabel jl3 = new JLabel("密碼"); jp3.add(jl3); jp3.add(jtf3); jp00.add(jp3); JPanel jp4 = new JPanel(); JLabel jl4 = new JLabel("密碼 *"); jp4.add(jl4); jp4.add(jtf4); jp00.add(jp4); JPanel jp5 = new JPanel(); JLabel jl5 = new JLabel("UNIT "); jp5.add(jl5); jp5.add(jtf5); jp00.add(jp5); JPanel jp6 = new JPanel(); JLabel jl6 = new JLabel("確認密碼* "); jp6.add(jl6); jp6.add(jtf6); jp00.add(jp6); JPanel jp7 = new JPanel(); JLabel jl7 = new JLabel("手機號 * "); jp7.add(jl7); jp7.add(jtf7); jp00.add(jp7); JPanel jp8 = new JPanel(); JLabel jl8 = new JLabel("區域 "); jp8.add(jl8); jp8.add(jtf8); jp00.add(jp8); JPanel jp9 = new JPanel(); JLabel jl9 = new JLabel("公交站 "); jp9.add(jl9); jp9.add(jtf9); jp00.add(jp9); jf.add(jp00); JPanel jp01 = new JPanel(); jta10.setText(" 這是修改員工資訊 !"); jp01.add(jta10); jf.add(jp01); jf.setSize(700, 500); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jf.setVisible(true); } public static void main(String[] args) { new Genggai(); } }