1.确保mysql已安装完且可连接,我个人用的是Homebrew下的8.0.18
2.加入连接mysql的依赖包
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.16</version> </dependency>
同样是mvnrepository里下的第一个/J
3.配置登陆需要的服务器地址以及用户名密码
String driverClass = "com.mysql.cj.jdbc.Driver"; String databaseName = "flight"; String serverIP = "localhost"; String usernameString = "root"; String password = "Shirase-1423l"; String jdbcUrl = "jdbc:mysql://" + serverIP + ":3306/" + databaseName + "?serverTimezone=Asia/Shanghai&useSSL=true";
这里serverTimezone和useSSL的参数设成别的还没有试结果
4.驱动+登陆
//加载Driver类 Class.forName("driverClass"); //登陆mysql Connection connect = DriverManager.getConnection(jdbcUrl, usernameString, password);
根据菜鸟教程给出的DBUtil类,简单分析一下里面的一些我觉得关键的点:
public class DBUtil { public static final String driverClass = "com.mysql.cj.jdbc.Driver"; public static final String databaseName = "flight"; public static final String serverIp = "localhost"; public static final String usernameString = "root"; public static final String password = "Shirase-1423l"; public static final String jdbcUrl = "jdbc:mysql://" + serverIp + ":3306/" + databaseName + "?serverTimezone=Asia/Shanghai&useSSL=true"; private static Connection connect = null; static { try { Class.forName(driverClass); connect = DriverManager.getConnection(jdbcUrl); } catch (SQLException | ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public static Connection getConnection() { return connect; } }
关键点:
1.Connection私有变量记录连接情况
2.static代码块中放置初始化以及连接功能代码,由于static代码块在类加载时运行且只运行一次。这样处理简单项目很优雅同时节省显式调用的语句。
3.在之后的每一次增删改查时,我们都要先获取connect,获取到连接信息,再进行数据操作,增删改查之类的。