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A client deletes an entity bean by invoking the method This invocation causes the EJB container to call the method, which deletes the entity class, the state from the database In the method invokes a private method named , which issues a SQL statement The method is short:
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The number and types of arguments must match a corresponding method The access control modifier must be or The method modifier cannot be The return type must be
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method encounters a system problem, it should throw the If it encounters an application error, it should throw a For a comparison of system and application exceptions, see the section Handling Exceptions, page (116) An entity bean may also be removed directly by a database deletion For example, if a SQL script deletes a row that contains an entity bean state, then that entity bean is removed
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If the EJB container needs to synchronize the instance variables of an entity bean with the corresponding values stored in a database, it invokes the and methods The method refreshes the instance variables from the database, and the method writes the variables to the database The client may not call and If a business method is associated with a transaction, the container invokes before the business method executes Immediately after the business method executes, the container calls Because the container invokes and , you do not have to refresh and store the instance variables in your business methods The class relies on the container to synchronize the instance variables with the database Therefore, the should be associated with transacbusiness methods of tions
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If the and methods cannot locate an entity in the underlying database, they should throw the This exception is a subclass of Because is a subclass of , you do not have to include it in the clause When is thrown, the EJB container wraps it in a before returning it to the client In the class, invokes the method, which issues a SQL statement and assigns the retrieved data to the instance variables The method calls the method, which stores the instance variables in the database with a SQL statement Here is the code for the and methods: