Spring Data JPA @EnableJpaRepositories Configuration

@EnableJpaRepositories annotations are used for srping JPA code configuration, to replace configuration files in XML form, @EnableJpaRepositories supported configuration forms are rich and versatile, this article explains in detail.

1. Simple Configuration

@EnableJpaRepositories ("Com.spr.repository")

The simple configuration supports multiple package formats as follows:

@EnableJpaRepositories ({"Com.cshtong.sample.repository", "Com.cshtong.tower.repository"})

2, single-value and multi-group value configuration method

Most annotations can support a single annotation method and multiple annotations, and multiple annotations typically take a set of data that is contained in the "{}" symbol.

For example: "x.y.z" in the form of a string = {"X.y.z", "A.B.C"}

Category: A.class = {a.class, b.class}

3, the complete @enablejparepositories annotation

@EnableJpaRepositories (     basePackages = {},      basePackageClasses = {},     includeFilters = {},      excludeFilters = {},      repositoryimplementationpostfix =  "Impl",      namedquerieslocation =   "",  //meta-inf/jpa-named-queries.properties     querylookupstrategy= querylookupstrategy.key.create_if_not_found, //querylookupstrategy.key.x      repositoryfactorybeanclass=jparepositoryfactorybean.class, //class      Entitymanagerfactoryref= "Entitymanagerfactory",      transactionmanagerref= " TransactionManager ",     considernestedrepositories=false,       enableDefaultTransactions=true )

The functions of each configuration item are explained separately below

1) basepackage

Used to configure the package and sub-package where the scan repositories is located. The configuration in a simple configuration is equivalent to this configuration value, and Basepackages can be configured as a single string or as a string array.

@EnableJpaRepositories (basepackages = "Com.cshtong")

Multiple package paths

@EnableJpaRepositories (basepackages = {"Com.cshtong.sample.repository", "Com.cshtong.tower.repository"}

2) basepackageclasses

Specifying the Repository class

@EnableJpaRepositories (basepackageclasses = bookrepository.class)

@EnableJpaRepositories (basepackageclasses = {shoprepository.class, organizationrepository.class})

Note: When testing, it is found that a repositories class of the configuration package class, the other repositores in the package will also be loaded

3) Includefilters

Filter with Componentscan Filter class

@EnableJpaRepositories (includefilters={@ComponentScan. Filter (Type=filtertype.annotation, Value=repository. Class)}

4) excludefilters

does not contain filters

@EnableJpaRepositories (excludefilters={@ComponentScan. Filter (Type=filtertype.annotation, VALUE=SERVICE.CLA SS), @ComponentScan. Filter (Type=filtertype.annotation, Value=controller.class)})

5) Repositoryimplementationpostfix

Implements the end of the class append, such as shoprepository, corresponding to the Shoprepositoryimpl

6) Namedquerieslocation

Named the location of SQL storage, default to Meta-inf/jpa-named-queries.properties

7) Querylookupstrategy

Build a policy for conditional queries, including three ways create,use_declared_query,create_if_not_found

• Create: Automatically build queries by interface name

• Use_declared_query: User claims query

• Create_if_not_found: Search for user-declared, non-existent, build automatically

This policy is for scenarios where queries are automatically generated by interface name as follows

  list<person> findbyemailaddressandlastname (emailaddress emailaddress, string  lastname);       // enables the distinct flag for  the query  list<person> finddistinctpeoplebylastnameorfirstname (String  Lastname, string firstname);  list<person>  Findpeopledistinctbylastnameorfirstname (String lastname, string firstname);       // enabling ignoring case for an individual property   list<person> findbylastnameignorecase (string lastname);     //  Enabling ignoring case for all suitable properties  List< Person> findbylastnameandfirstnameallignorecase (String lastname, string firstname);       // enabling static order by for a query  list<person>  FINDBYLASTNAMEORDERBYFIRSTNAMEASC (String lastname);  list<person>  Findbylastnameorderbyfirstnamedesc (String lastname)

8) Repositoryfactorybeanclass

Specify the factory class for repository

9) Entitymanagerfactoryref

Entity Management Factory reference name, corresponding to the method that corresponds to the @bean annotation

@Beanpublic  localcontainerentitymanagerfactorybean entitymanagerfactory ()  {     LocalContainerEntityManagerFactoryBean entityManagerFactoryBean =                            new localcontainerentitymanagerfactorybean ();     Entitymanagerfactorybean.setdatasource (DataSource ());     Entitymanagerfactorybean.setpersistenceproviderclass (Hibernatepersistenceprovider.class);     entitymanagerfactorybean.setpackagestoscan (                  env.getrequiredproperty (Property_name_entitymanager_packages_to_scan ));     entitymanagerfactorybean.setjpaproperties (Hibproperties ());     Return entitymanagerfactorybean;}

) Transactionmanagerref

Transaction Management factory reference name, corresponding to the method that corresponds to the @bean annotation

@Beanpublic Jpatransactionmanager TransactionManager () {Jpatransactionmanager TransactionManager = new JpaTransaction    Manager ();    Transactionmanager.setentitymanagerfactory (Entitymanagerfactory (). GetObject ()); return TransactionManager;}

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Spring Data JPA @EnableJpaRepositories Configuration