Guide to Java Persistence and HibernateSebastian Hennebrueder

Guide to Java Persistence and HibernateSebastian Hennebrueder

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Table of ContentsAbout the author, book and versions ................................................................................................ viii

1. The author ............................................................................................................................. viii2. The book ................................................................................................................................ viii3. Library Versions ...................................................................................................................... ix

I. Introduction ........................................................................................................................................ 11. Introduction to Hibernate ......................................................................................................... 2

1.1. A first Hibernate example ............................................................................................. 21.2. Hibernate basics ........................................................................................................... 19

2. Hibernate Concepts - State of Objects ................................................................................... 212.1. The three states of objects ........................................................................................... 212.2. Lazy initialization, a Hibernate problem ..................................................................... 23

3. Working with Objects ............................................................................................................. 273.1. Java Persistence versus Hibernate ............................................................................... 273.2. Hibernate API .............................................................................................................. 273.3. EntityManager API ...................................................................................................... 34

4. A more complex example – web application ......................................................................... 404.1. Summary ...................................................................................................................... 49

II. Mapping, Queries ........................................................................................................................... 515. Basic Mappings ...................................................................................................................... 52

5.1. Annotation versus XML .............................................................................................. 525.2. Annotation mapping ..................................................................................................... 535.3. XML Mapping ............................................................................................................. 58

6. Primary key mapping ............................................................................................................. 636.1. Natural versus Surrogate Ids ....................................................................................... 636.2. Assigned Id .................................................................................................................. 646.3. Generated with Auto Strategy ..................................................................................... 646.4. Other Annotation Strategies ........................................................................................ 646.5. Composite Id ................................................................................................................ 656.6. Equals and Hashcode ................................................................................................... 686.7. Other XML Id tags ...................................................................................................... 72

7. Relation mapping .................................................................................................................... 757.1. Selecting between List, Set, Map or array to hold many side ..................................... 757.2. Uni- and Bi-directional relations ................................................................................. 847.3. Cascading ..................................................................................................................... 867.4. 1:1 relation ................................................................................................................... 887.5. 1:n ................................................................................................................................ 947.6. m:n ............................................................................................................................. 1047.7. 1:n:1 ........................................................................................................................... 1097.8. Recursive relation ...................................................................................................... 1117.9. Typed relation (XML only) ....................................................................................... 1137.10. Typed relation (annotation workaround) ................................................................. 115

8. Components = Composition mapping .................................................................................. 1198.1. Composition versus entity relations ........................................................................... 1198.2. Composed class in one table ..................................................................................... 1208.3. Composition as set of many classes .......................................................................... 1238.4. Equals implementation ............................................................................................... 1248.5. Composition as list of many classes .......................................................................... 125

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