用java设计一个数据库管理系统 如何用java做一个数据库
JAVA \u8bfe\u7a0b\u8bbe\u8ba1\u8fde\u63a5\u6570\u636e\u5e93 \u7528java\u7f16\u5199\u56fe\u4e66\u7ba1\u7406\u7cfb\u7edfimport java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Properties;
public clss DBTest{
public DBTest(){
//\u52a0\u8f7d\u9a71\u52a8
try{
class.forName("com.mysql.jdbc.Driver");
//\u8bbe\u7f6e\u6570\u636e\u5e93\u7684\u8bbf\u95ee\u8def\u5f84
String url = "jdbc:mysql://localhost:3306//derby";
//\u8bbe\u7f6e\u7528\u6237\u540d\u548c\u5bc6\u7801
Properties info = new Properties();
info.setProperty("user","zhanghao");
info.setProperty("password","mima");
//\u83b7\u53d6\u8fde\u63a5
Connection conn = DriverManager.getConnection(url,info);
Statement stmt = conn.createStatement();
//\u7ec4\u7ec7\u67e5\u8be2\u8bed\u53e5
String sql = "select * form table_name";
//\u83b7\u53d6\u67e5\u8be2\u7ed3\u679c\u96c6\u5408
ResultSet result = stmt.excuteQuery(sql);
//\u904d\u5386\u7ed3\u679c,\u5047\u8bbetable_name\u4e2d\u7b2c\u4e00\u5217\u4e3aid,\u7c7b\u578bint
while(result.next()){
System.out.println(result.getInt(1));
}
}catch(SQLException){
}
catch(Exception e){
// e.printStackTrace();
}finally{
//\u6700\u540e\u5173\u95ed\u8d44\u6e90
result.close();
stmt.close();
conn.close();
}
}
}
//\u73b0\u573a\u624b\u6253 \u53ef\u80fd\u4f1a\u6709\u70b9\u4e0b\u9519\u8bef \u4f60\u81ea\u5df1\u6d4b\u8bd5\u4e0b \u5927\u81f4\u6d41\u7a0b\u5c31\u662f\u8fd9\u6837\u7684
\u4f60\u53ef\u4ee5\u628a\u4fe1\u606f\u5b58\u50a8\u5230\u4e00\u4e2afinal\u4fee\u9970\u7684Map\u4e2d\uff0c\u4e4b\u540eKey\u662f\u4e3b\u952eValue\u662f\u6570\u636e\u3002\u4e0d\u8fc7\u91cd\u542f\u4e4b\u540e\u6570\u636e\u5c31\u4f1a\u90fd\u4e22\u4e86
import java.sql.*;import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
//import java.awt.event.*;
public class DisplayDemo extends JFrame
//implements ActionListener
{
// private String dbURL="jdbc:microsoft:sqlserver://202.115.26.181:1433"; // 数据库标识名
private String user="devon"; // 数据库用户
private String password="book"; // 数据库用户密码
private JTable table;
private JButton ok,canel;
public DisplayDemo(){
super("显示数据库查询结果"); //调用父类构造函数
String[] columnNames={"用户名","年龄","性别","Email"}; //列名
Object[][] rowData=new Object[5][4]; //表格数据
ok=new JButton("确定");
canel=new JButton("取消");
// ok.addActionListener(this);
// canel.addActionListener(this);
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbc:odbc:example","sa","");
// Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver"); //加载驱动器
// Connection con=DriverManager.getConnection(dbURL,user,password); //获取连接
String sqlStr="select * from users"; //查询语句
PreparedStatement ps=con.prepareStatement(sqlStr); //获取PreparedStatement对象
ResultSet rs=ps.executeQuery(); //执行查询
String name,sex,email; //查询结果
int age;
int count=0;
while (rs.next()){ //遍历查询结果
rowData[count][0]=rs.getString("name"); //初始化数组内容
rowData[count][1]=Integer.toString(rs.getInt("age"));
rowData[count][2]=rs.getString("sex");
rowData[count][3]=rs.getString("email");
count++;
}
con.close(); //关闭连接
}
catch(Exception ex){
ex.printStackTrace(); //输出出错信息
}
Container container=getContentPane(); //获取窗口容器
//container.setLayout(null);
container.add(ok);container.add(canel); ok.setBounds(10,120,70,20);
canel.setBounds(100,120,70,20);
table=new JTable(rowData,columnNames); //实例化表格
table.getColumn("年龄").setMaxWidth(25); //设置行宽
container.add(new JScrollPane(table),BorderLayout.CENTER); //增加组件
setSize(300,200); //设置窗口尺寸
setVisible(true); //设置窗口可视
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //关闭窗口时退出程序
}
public static void main(String[] args){
new DisplayDemo();
}
}
-----------------
这是其中一个例子 你照着上面做就可以了
这种系统应该网上很多吧
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