jdbc连接oracle数据库

import java.sql.*;

public class JdbcOracleExample {
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        
        try {
            // 加载Oracle JDBC驱动
            Class.forName("oracle.jdbc.driver.OracleDriver");
            
            // 建立连接
            String url = "jdbc:oracle:thin:@hostname:port:sid";
            String user = "username";
            String password = "password";
            conn = DriverManager.getConnection(url, user, password);
            
            // 创建Statement对象
            stmt = conn.createStatement();
            
            // 执行查询
            String sql = "SELECT * FROM employees";
            rs = stmt.executeQuery(sql);
            
            // 处理结果集
            while (rs.next()) {
                int id = rs.getInt("employee_id");
                String name = rs.getString("first_name") + " " + rs.getString("last_name");
                System.out.println("ID: " + id + ", Name: " + name);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭资源
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}