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Look at two find methods only
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findByPrimaryKey()
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findBidsByItem()
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Example 16 shows the
source code for finding a Bid by its primary key
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This is a mandatory finder method for entity beans
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Very simple
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Query the DB using the primary key provided
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Throw exception if no row found
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Otherwise, return the key
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Note: key
returned, not object
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EJB container will turn key into object for client
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