An enterprise bean that represents persistent data maintained in a database. An entity bean can manage its own persistence or
can delegate this function to its container. An entity bean is identified by a primary key. If the container in which an
entity bean is hosted crashes, the entity bean, its primary key, and any remote references survive the crash.
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entity is an idea..object is the instance of the idea..
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Tuesday, June 10, 2008
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A thread is a the entity within a process that Windows schedules for execution. A thread has. The contents of a set of CPU registers representing the state of the processor. 2 stacks, 1 for the thread to use in kernel mode, and 1 for user mode. Private storage called Thread Local Storage for use by subsystems, run-time libraries, and DLLs and;. A thread ID.
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Tuesday, May 13, 2008
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A JavaServer Faces EL expression that refers to a property of a backing bean. A component tag uses this expression to bind the associated component's value or the component instance to the bean property. If the component tag refers to the property via its value attribute, then the component's value is bound to the property. If the component tag refers to the property via its binding attribute then the component itself is bound to the property.
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Uniform resource name. A unique identifier that identifies an entity but doesn't tell where it is located. A system can use a URN to look up an entity locally before trying to find it on the Web. It also allows the Web location to change, while still allowing the entity to be found.
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A general entity that contains something other than XML. By its nature, an unparsed entity contains binary data.
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There are two Integrity rules. Entity Integrity: States that "Primary key cannot have NULL value"
Referential Integrity: States that "Foreign Key can be either a NULL value or should be Primary Key value of other relation.
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