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ubuntu24.04
jdk7
mysql8
mysql-connector-java-5.1.49

1.注册驱动

2.连接数据库

3.获得执行SQL的对象

4.执行SQL语句

5.关流

6.释放资源

7.代码示例：亲测可用

7.1jar包下载地址：

https://dev.mysql.com/downloads/file/?id=537120

8.0版本的jar包下载地址，点击直接下载。

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.11.zip

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.12.zip

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.13.zip

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.14.zip

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.15.zip

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.16.zip

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.17.zip

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-8.0.18.zip

5.0版本的jar包下载地址，点击直接下载。

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-5.1.47.zip

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-5.1.48.zip

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-5.1.49.zip

unzip Test.zip -d ~/Desktop/

7.2 导入
打开 File -> Project Structure
单击 Libraries -> "+" -> "Java" -> 选择我们需要导入本地jar的项目，点击OK


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.PreparedStatement;import java.sql.*;public class JdbcTest {// MySQL 8.0 以下版本 - JDBC 驱动名及数据库 URLstatic final String JDBC_DRIVER5 = "com.mysql.jdbc.Driver";  static final String DB_URL5 = "jdbc:mysql://localhost:3306/mytest";// MySQL 8.0 以上版本 - JDBC 驱动名及数据库 URL//static final String JDBC_DRIVER = "com.mysql.cj.jdbc.Driver";  //static final String DB_URL = "jdbc:mysql://localhost:3306/mytest?useSSL=false&allowPublicKeyRetrieval=true&serverTimezone=UTC";// 数据库的用户名与密码，需要根据自己的设置static final String USER = "root";static final String PASS = "123@1234";public static void main(String[] args) {Connection connection = null;Statement stmt = null;try {//1.注册JDBC驱动Class.forName(JDBC_DRIVER);//2. 打开链接System.out.println("连接数据库...");conn = DriverManager.getConnection(DB_URL,USER,PASS);//3. 执行查询System.out.println(" 实例化Statement对象...");stmt = conn.createStatement();String sql;sql = "SELECT id, name FROM mytest";ResultSet rs = stmt.executeQuery(sql);//4. 展开结果集数据库while(rs.next()){// 通过字段检索int id  = rs.getInt("id");String name = rs.getString("name");String url = rs.getString("url");// 输出数据System.out.print("ID: " + id);System.out.print(", 名称: " + name);System.out.print("\n");}// 完成后关闭rs.close();stmt.close();conn.close();}catch(SQLException se){// 处理 JDBC 错误se.printStackTrace();}catch(Exception e) {// 处理 Class.forName 错误e.printStackTrace();}finally{// 关闭资源try{if(stmt!=null) stmt.close();}catch(SQLException se2){}// 什么都不做try{if(conn!=null) conn.close();}catch(SQLException se){se.printStackTrace();}}System.out.println("Goodbye!");}

备注：
1.mysql8.0;
2.JDK7: JDK7
3.JDBC :java-mysql 5.1.49 是可以在 JDK7下连mysql 8.0的
4.但是驱动写法都要用mysql 5的写法，不是mysql8.0的写法。