Database JDBC

The JDBC URL = protocol name + name + sub-protocol data source name.
a protocol name is always "jdbc".
b sub-protocol name is determined by the writer JDBC driver.
It may also comprise a data source name and user password and other information; information may also be provided separately.

Common database connection

//Oracle
驱动：oracle.jdbc.driver.OracleDriver
URL：jdbc:oracle:thin:@machine_name:port:dbname
注：machine_name：数据库所在的机器的名称；
      port：端口号，默认是1521

//mysql
驱动：com.mysql.jdbc.Driver
URL：jdbc:mysql://machine_name:port/dbname
注：machine_name：数据库所在的机器的名称；
      port：端口号，默认3306    

//SQL Server
驱动：com.microsoft.jdbc.sqlserver.SQLServerDriver
URL：jdbc:microsoft:sqlserver://<machine_name><:port>;DatabaseName=<dbname>
注：machine_name：数据库所在的机器的名称；
      port：端口号，默认是1433

//DB2
驱动：com.ibm.db2.jdbc.app.DB2Driver
URL：jdbc:db2://<machine_name><:port>/dbname
注：machine_name：数据库所在的机器的名称；
      port：端口号，默认是5000