Jdbc three ways to register drivers
About the driver package Register the driver in jdbc, first import the corresponding package, such as mysql-connector-java-5.0.8-bin.jar. The driver package is a bridge between Java and a specific database, developed by the database vendor. Each database corresponds to a driver jar, and even each version of the database has its own version of the driver jar. 1: the first way Class.forName("oracle.jdbc.driver.OracleDriver");//Load driver Connection conn = DriverManager.getConnection ("jdbc:oracle:thin:@127.0.0.1:1521:XE", "system", "123456"); System.out.println("conn============>"+conn); 2: The second way Driver driver = new oracle.jdbc.driver.OracleDriver(); DriverManager.registerDriver (driver); / / (JDBC2.0 can be omitted later, the default operation) Connection conn = DriverManager.getConnection ("jdbc:oracle:thin:@127.0.0.1:1521:XE", "system", "123456"); System.out.println("conn============>"+conn); 3: The third way: Add the full path of the oracle driver (ojdbc.jar) under the classpath (including the driver name itself) Java -Djdbc.drivers=oracle.jdbc.driver.full pathname of the OracleDriver class Some of the online said that the third is: System.setProperty ("jdbc.drivers", "com.mysql.jdbc.Driver"); After reading the DriverManager source code, it is found that the original DriverManager getConnection will be obtained from jdbc.drivers The jdbc driver is then registered to your own list of jdbc drivers. The third way is to register multiple drivers at once, with the middle: separate. For example, System.setProperty ("jdbc.drivers", "XXXDriver:XXXDriver:XXXDriver"); This will register three database drivers at a time. OVNS 1500 Puffs Vape is so convenient, portable, and small volume, you just need to take them ovns 1500 puffs vape bars,ovns 1500 puffs vape device,ovns 1500 puffs vape disposable,ovns 1500 puffs vape starter kit,ovns 1500 puffs vape pen Ningbo Autrends International Trade Co.,Ltd. , https://www.vapee-cigarettes.com
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