You can also configure whether Cloudscape writes over or appends to the log with the cloudscape. For details, see Platform Support. Failed to start database ‘toursDB’, see the next exception for details. Cloudscape comes with a local JDBC driver. You can access jarDB2 by specifying the path to the jar file along with the jar subsubprotocol, like this:. It is possible to access databases from a jar file. The data in the database disk files is stored in a portable format, so that databases can be easily transported from machine to machine regardless of the CPU architecture of each machine.
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Booting The default configuration for Cloudscape is that Cloudscape boots a database when an application first makes a connection to it. At times, you might notice Derby and Cloudscape being used as synonyms, and you might see the core database engine referred to as Cloudscape, especially in other IBM developerWorks technical articles and when referring to jxbc Cloudscape releases. All such databases are treated as read-only databases. For more information on creating synchronization databases, see the Cloudscape Synchronization Guide.
As mentioned above, if a stored procedure includes OUT parameters, a client application executes the stored procedure using the CallableStatement method, as shown in Listing jbdc.
WebLogic JDBC Options
Recovery ensures that all cloudscqpe transactions at the time the system failed are applied to the database, and all transactions that were active are rolled back. A successful shutdown always results in an SQLException to indicate that Cloudscape has shut down and that there is no other exception. The clodscape directory can also contain an error log file called cloudscape. A page is a unit of storage whose size is configurable on a system-wide, database-wide, or conglomerate-specific basis.
The way you specify an absolute path is defined by the host operating system see java. On some platforms, Cloudscape can successfully prevent a second instance of Cloudscape from booting the database, and thus prevents corruption. When used in this manner, you can use any functionality available in the two-tier driver in a WebLogic multitier configuration.
Checkpointing marks the portions of the log that are no longer useful, writes changed pages to disk, then truncates the log.
G Example properties for Cloudscape JDBC driver (Cloudscape)
A simpler way to jjdbc up a Cloudscape database is simply to use operating system tools to copy the database directory. Use wait and notify calls instead.
In most cases, you access databases from the file system as described above. The Information Error Log Once you create or connect to a database within a system, Cloudscape begins outputting information and error messages, kdbc any. To access an unarchived database from the class path, specify the name of the database relative to the directory in the class path.
An example use of the database connection URL: The system directory contains any persistent system-wide configuration parameters, or properties, specific to that system in a properties file called cloudscape. In a Java application, you typically load the driver with the static Class.
Working with Database Threads in an Embedded Environment Do not use sleep and interrupt calls to notify threads that are accessing a database, because Cloudscape will catch the interrupt call and close the connection to the database.
However, all versions of the database connection URL which you can use for tasks besides connecting to a database have common features:.
Connect to cloudscape : Cloudscape « Database SQL JDBC « Java
This technical article uses “Derby” when referring to any feature that is part of the open source database engine, including:. Understanding the Cloudscape system is essential to successful development and deployment of Cloudscape applications.
This driver is provided for your use without charge. Derby is a lightweight, embeddable relational engine in the form of a Java class library.
Cloudscape Version 10: A technical overview
This ensures that only permitted, authenticated users access or modify a database. Doing so will help you remember that:. A Cloudscape database also stores its own configuration information. If two different database name values, relative or absolute, refer to the same actual directory, they are considered equivalent.
That is, back up the entire system directory in cloudscaps to back up:. Applications must load the driver in order to work with the database. The data in the database disk files is stored in a portable format, so that databases can be easily transported from machine to machine regardless of the CPU architecture of each machine.
Shutting Down the System In an embedded environment, when an application shuts down, it should first shut down Cloudcsape. Note that third-party JDBC drivers that do not implement Serializable or Remote interfaces cannot pass objects to a T3 client application. You define the system directory when Cloudscape starts up by specifying a Java system property called cloudscape.