How MySQL, Oracle, and SQL Server database JDBC are connected

How to connect MySQL, Oracle, SQL Server database JDBC mysql:                  add a MySQL jar package first                   String url= "jdbc:mysql://localhost:3306/database name";       //Database address                  String name= "root";      //database user name                   String password= "123456";      // Database user Password                  Class.forName ("Com.mysql.jdbc.Driver");     //load MySQL driver                   Connection conn = Drivermanager.getconnection ( Url,name,passWOrd);      //Connection Database  Oracle:                 Add Oracle's JAR package                  String url= "Jdbc:oracle:thin: @localhost: 1521: Database Name";      //Database address                 String name= "Database user name";      //database user name                  String password= "database user password";      / /database user Password                 Class.forName ("Oracle.jdbc.driver.OracleDriver");      //load Oracle Drive                  Connection conn = Drivermanager.getconnection (URL,Name,password);      //Connection Database  sql server:                      Add a jar package for SQL Server                        String url= "jdbc:sqlserver://localhost:1433;databasename= database name";      // Database Address                       sring name= "Database username";      //database user name                       String Password = "Database user password";      //database user password                       Class.forName (" Com.microsoft.sqlserver.jdbc.SQLServerDriveR ");      //Load SQL Server driver                       Connection conn = Drivermanager.getconnection ( Url,name,password);      //Connection database  

How to connect MySQL, Oracle, SQL Server database JDBC