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Before you can establish a connection to a database server, your application must provide certain key pieces of information that describe the desired server. Each type of connection component surfaces a different set of properties to let you identify the server. In general, however, they all provide a way for you to name the server you want and supply a set of connection parameters that control how the connection is formed. Connection parameters vary from server to server. They can include information such as user name and password, the maximum size of BLOB fields, SQL roles, and so on.
Once you have identified the desired server and any connection parameters, you can use the connection component to explicitly open or close a connection. The connection component generates events when it opens or closes a connection that you can use to customize the response of your application to changes in the database connection.
The following topics provide details about opening and closing database connections: