Persisting dependent objects as part of a CMP entity bean


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Thread: Persisting dependent objects as part of a CMP entity bean

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  1. #1
    Elyk Guest

    Persisting dependent objects as part of a CMP entity bean


    hello:

    I was just reading "Enterprise JavaBeans" published by O'Reilly Press and
    I have a qustion about Chapter 9. The chapter discusses "Design Strategies"
    and one subsection discusses "Passing Objects by Value." The author defines
    dependent objects as "objects that only have meaning within the context of
    another object." The example given is of an address object that could contain
    four fields: street, city, state, zip. My question is this:

    If a CMP Entity Bean has a data member that is a custom class object (like
    the Address class for example), then how is that data persisted to the database?
    Does the container examine the contents of the Address class and then persist
    those as individual fields, or is the entire object serialized and then persisted?
    Also, what must be done in the deployment descriptor to map the data contained
    in the Address class?

    Thanks.

  2. #2
    mazin Guest

    Re: Persisting dependent objects as part of a CMP entity bean


    "Elyk" <scullywoman@hotmail.com> wrote:
    >
    >hello:
    >
    >I was just reading "Enterprise JavaBeans" published by O'Reilly Press and
    >I have a qustion about Chapter 9. The chapter discusses "Design Strategies"
    >and one subsection discusses "Passing Objects by Value." The author defines
    >dependent objects as "objects that only have meaning within the context

    of
    >another object." The example given is of an address object that could contain
    >four fields: street, city, state, zip. My question is this:
    >
    >If a CMP Entity Bean has a data member that is a custom class object (like
    >the Address class for example), then how is that data persisted to the database?
    >Does the container examine the contents of the Address class and then persist
    >those as individual fields, or is the entire object serialized and then

    persisted?
    >Also, what must be done in the deployment descriptor to map the data contained
    >in the Address class?
    >
    >Thanks.




    If a CMP Entity Bean has a data member that is a custom class object (like
    the Address class for example), then how is that data persisted to the database?
    you need to persiste the value for this class on it own, and later on you
    need to link this class to the other class by using findbyprmarykey

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