By Patrick Peak
ISBN-10: 1932394419
ISBN-13: 9781932394412
A concise advent to Hibernate's many configuration and layout techniques, this ebook distills Hibernate into digestible items with many code examples, useful utilization eventualities, and assurance of the instruments to be had to builders writing Hibernate purposes. utilizing a move slowly, stroll, run instructing method, builders will research what Hibernate is, what it could possibly do, and the way it may be used successfully. New Hibernate positive factors are coated and the supplied code examples are incrementally developed as new innovations are brought. The examples integrated execute from Ant and run as JUnit try out instances. An realizing of JUnit isn't required and operating the code as a chain of try instances allows the simply tested performance with out resorting to a sophisticated net software. How Hibernate can paintings with different universal improvement instruments and frameworks like XDoclet, Struts, Webwork, Spring, and Tapestry can be mentioned in addition to writing mapping records and growing institutions.
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8 Cartesian product result Although all the data was retrieved with a single query, Cartesian products are generally inefficient. For this reason, to retrieve the data for one-to-many associations, you should execute a separate query for each object. 2 also has a one-to-many association of Attendee instances. To retrieve the data for the Attendee objects, you must write operations similar to the Speaker association. Since an object graph often contains many objects, the amount of code needed to retrieve a full object graph for an Event can be quite large.
On 1 What’s a Wiki? Think of it as a massively multiplayer website where any visitor can read, learn, and add their knowledge to the community. WikiWikiWeb, the original Wiki, for more information. 1 Select a mirror site for the Hibernate distribution. Linux\Unix, create /applications. Extract the Hibernate distribution into that directory. 2. jar, which contains all the framework code; the /lib directory, which holds all the Hibernate dependencies; and the /doc directory, which has the JavaDocs and a copy of the reference documentation.
You can usually determine the operation to execute by examining the object’s id property. If the ID type is an object, such as a Long or Integer, you can assume that the object is transient and hasn’t yet been persisted if the ID’s value is null. If the ID type is a primitive, such as int or long, a value of 0 indicates a transient object. ) In both cases, a SQL INSERT should be issued after converting the object to a relational format. Otherwise, an UPDATE would be issued for the object, keyed on the value of the ID.
Hibernate Quickly by Patrick Peak
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