# Database connection URLs

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.

Here is the format for the database connection URL for connecting to an existing Derby database using the embedded driver:

- jdbc:derby:databaseName;URLAttributes

The format for the database connection URL for connecting to an existing Derby database using the Network Client is:

- jdbc:derby://host:port/databaseName;URLAttributes

The italicized items stand for something the user fills in:

- databaseName

  The name of the database you want to connect to. This might also include the file system path to the database.

- URLAttributes

  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 the Java DB Developer's Guide.

- host

  The name of the machine where the server is running. It can be the name of the machine or the address.

- port

  The port number used by the server framework

#### About Protocols

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.

Parent topic: JDBC connection basics