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目录
连接方式一:drive创建对象需要导入jar包(第三方API)
- @Test
- //第一种连接方式
- public void test() throws Exception {
- //获取Driver实现类对象,也可导入此类,在这里写出只是更好说明此类路径
- com.mysql.jdbc.Driver driver = new com.mysql.jdbc.Driver();
- /*
- * url:类似于http地址,用于连接指定数据库,前半截不变,后面test表示你的数据库的名称;
- * jdbc:mysql:协议
- * localhost:IP地址
- * 3306:mysql默认端口号
- * test:数据库名
- */
- String url = "jdbc:mysql://localhost:3306/test";
-
- //将数据名和密码封存在Properties中
- Properties info = new Properties();
- info.setProperty("user", "root");
- info.setProperty("password", "6868");
-
- //获取连接
- Connection conn = driver.connect(url, info);
-
- System.out.println(conn);
- }
- /*第二种连接方式:对于第一种方式的迭代,使得程序中不再出现第三方的API,
- 使程序具有更好的可移植性*/
- @Test
- public void test02() throws Exception {
- //1.获取Driver实现类对象,在这里使用反射
- Class clazz = Class.forName("com.mysql.jdbc.Driver");
- Driver driver = (Driver) clazz.newInstance();
-
- //2.提供要连接的数据库
- String url = "jdbc:mysql://localhost:3306/test";
-
- //3.提供连接需要的用户名和密码
- Properties info = new Properties();
- info.setProperty("user", "root");
- info.setProperty("password", "6868");
-
- //4.获取数据库连接
- Connection conn = driver.connect(url, info);
-
- System.out.println(conn);
- }
- //方式三:使用DriverManagement替换Driver
- @Test
- public void test03() throws Exception {
- //1.获取Driver实现类对象,在这里使用反射
- Class clazz = Class.forName("com.mysql.jdbc.Driver");
- Driver driver = (Driver) clazz.newInstance();
-
- //2.获取连接的3个对象信息
- String url = "jdbc:mysql://localhost:3306/test";
- String user = "root";
- String password = "6868";
-
- //3.注册驱动
- DriverManager.registerDriver(driver);
-
- //4.获取数据库连接
- Connection conn = DriverManager.getConnection(url, user, password);
-
- System.out.println(conn);
- }
- //方式四
- @Test
- public void test04() throws Exception {
- //1.获取连接的3个对象信息
- String url = "jdbc:mysql://localhost:3306/test";
- String user = "root";
- String password = "6868";
-
- //2.加载Driver,内置静态代码块,可自动加载驱动程序
- Class.forName("com.mysql.jdbc.Driver");
-
- // //3.注册驱动
- // DriverManager.registerDriver(driver);
-
- //3.获取连接
- Connection conn = DriverManager.getConnection(url, user, password);
-
- System.out.println(conn);
- }
新建一个properties文件保存基本信息
- //方式五
- @Test
- public void test05() throws IOException, ClassNotFoundException, SQLException {
- //1.读取配置文件的4个基本信息
- InputStream is = MyConnection.class.getClass().getResourceAsStream("jdbc.properties");
-
- Properties pros = new Properties();
- pros.load(is);
-
- String url = pros.getProperty("url");
- String user = pros.getProperty("user");
- String password = pros.getProperty("password");
- String driverClass = pros.getProperty("driverClass");
-
- //2.加载驱动
- Class.forName(driverClass);
-
- //3.获取连接
- Connection conn = DriverManager.getConnection(url, user, password);
-
- System.out.println(conn);
-
- }
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