The application can be a single-user application or a multi-user application
server. In the latter case, runs
embedded in the user-provided server framework, and any client applications
use user-provided connectivity or allow the application server to handle all
database interaction.
<ph conref="devconrefs.dita#prod/productshortname"></ph> embedded
in a single-user Java application
Derby in a single-user application
scenario.
Derby embedded in a multi-user Java application
server
Derby in a multi-user application
scenario.
When a database
is embedded in a Java application, the database is dedicated to that single
application. If you deploy more than one copy of the application, each
application has its own copy of the database and software.
A server framework
can work in multi-threaded, multi-connection mode and can even connect to
more than one database at a time. A server framework, such as the Network
Server, can be used to manage multiple connections and handle network capabilities.
Some server framework solutions, such as WebSphere Application Server, provide
additional features such as web services and connection pooling. However,
only one server framework at a time can operate against a database.
The application
accesses an embedded database
through the JDBC API. To connect, an application makes a call to the local JDBC driver. Accessing
the JDBC driver automatically starts the embedded software.
The calling application is responsible for shutting down the embedded database software.