A JDBC URL provides a way of identifying a database so that the appropriate driver recognizes it and connects to it. In the Derby documents, a JDBC URL is referred to as a database connection URL.
After the driver is loaded, an application must specify the correct database connection URL to connect to a specific database. The Derby database connection URL allows you to accomplish tasks other than simply connecting. For more information about the Derby database connection URLs, see the Java DB Developer's Guide.
A JDBC URL always starts with jdbc:. After that, the format for the database connection URL depends on the JDBC driver.
The name of the database you want to connect to. This might also include the file system path to the database.
One or more of the supported attributes of the database connection URL, such as upgrade=true, create=true or territory=ll_CC. For more information, see "Setting attributes for the database connection URL" in the Java DB Reference Manual.
The name of the machine where the server is running. It can be the name of the machine or the address.
The port number used by the server framework
Officially, the portion of the database connection URL called the protocol is jdbc:, just as http:// is a protocol in Web URLs. However, the second portion of the database connection URL (everything between jdbc: and databaseName), which is called the subprotocol, is informally considered part of the protocol. Later in this book you might see references to protocol. Consider protocol to be everything that comes before databaseName.
For complete information about the database connection URL, see the Java DB Developer's Guide.