JDBC操作数据库

import java.sql.*;

public class JdbcTest {
    static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";
    static final String DB_URL = "jdbc:mysql://localhost:3306/zs?useSSL=false&serverTimezone=Hongkong&characterEncoding=utf-8&autoReconnect=true";
    static final String USER = "root";
    static final String PASS = "1234";

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        try{
            // 加载JDBC驱动程序
            Class.forName(JDBC_DRIVER);

            // 连接数据库
            System.out.println("连接数据库...");
            conn = DriverManager.getConnection(DB_URL,USER,PASS);

            // 创建Statement
            System.out.println("创建Statement...");
            stmt = conn.createStatement();

            // 执行查询
            String sql = "SELECT * FROM test";
            ResultSet rs = stmt.executeQuery(sql);

            // 处理结果集
            while(rs.next()){
                int id = rs.getInt("id");
                String name = rs.getString("name");
                int age = rs.getInt("age");

                System.out.print("ID: " + id);
                System.out.print(", Name: " + name);
                System.out.println(", Age: " + age);
            }
            rs.close();

            // 关闭连接和释放资源
            stmt.close();
            conn.close();
        }catch(SQLException se){
            // 处理SQL异常
            se.printStackTrace();
        }catch(Exception e){
            // 处理Class.forName异常
            e.printStackTrace();
        }finally{
            // 最后关闭资源
            try{
                if(stmt!=null) stmt.close();
            }catch(SQLException se2){
            }
            try{
                if(conn!=null) conn.close();
            }catch(SQLException se){
                se.printStackTrace();
            }
        }
    }
}