java小型数据库

import java.sql.*;

public class H2Example {
    public static void main(String[] args) {
        try {
            // 加载H2数据库驱动
            Class.forName("org.h2.Driver");

            // 创建连接字符串
            String url = "jdbc:h2:~/test";
            String user = "sa";
            String password = "";

            // 建立连接
            Connection conn = DriverManager.getConnection(url, user, password);

            // 创建表
            Statement stmt = conn.createStatement();
            stmt.execute("CREATE TABLE IF NOT EXISTS users (id INT PRIMARY KEY, name VARCHAR(255))");

            // 插入数据
            PreparedStatement pstmt = conn.prepareStatement("INSERT INTO users (id, name) VALUES (?, ?)");
            pstmt.setInt(1, 1);
            pstmt.setString(2, "John Doe");
            pstmt.executeUpdate();

            // 查询数据
            ResultSet rs = stmt.executeQuery("SELECT * FROM users");
            while (rs.next()) {
                System.out.println("ID: " + rs.getInt("id") + ", Name: " + rs.getString("name"));
            }

            // 关闭连接
            rs.close();
            pstmt.close();
            stmt.close();
            conn.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}