spring jpa tutorial

First, method name resolution　　1. Introduction　　　　Review the DAO interface in the HelloWorld project Public Interface extends Jparepository{ // New Custom Query method list Findbyage (Integer age);}　　　　As you can see, in this interface we just declare the method without writing the implementation, but it is available, and this is thanks to the JPA method name parsing　　2. Simple condition QueryAccording to the specifications of

1. Create a new MAVEN project in IntelliJ Give a good example, (the business logic component UserService is omitted in this example) 2. Configuring Dependencies in Pom.xml includes: Spring-contextspring-ormspring-data-jpahibernate-corehibernate -entitymanagermysql-connector-javacommons-dbcpjunitspring-testThe code is as follows:3. Resources Right-click New an XML Configuration file--spring Config profile:

(); }5 Complex Interface Jpaspecificationexecutor: Does not inherit the above interface, is a single interface Public Interface Jpaspecificationexecutor { T findOne (specification spec); List spec); Page spec, pageable pageable); List spec, sort sort); Long count (specification spec); } Spring Data JPA Why just define the int

The spring Data Jpa is used in the project, which is much more comfortable than the hibernate sessionfactory, and most of the SQL statements are automatically generated by spring for us.Previous applications were limited to the basics of spring Data JPA, such as CRUD operati

Org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImplforPhysicalnamingstrategystandardimplhave aDefaultnamingstrategythe effect, forSpringphysicalnamingstrategyhave aImprovednamingstrategythe effect. After looking at these two classes of source code, found that the above thinking is still possible the following is my CodeImport Org.hibernate.boot.model.naming.identifier;importOrg.hibernate.boot.model.naming.physicalnamingstrategystandardimpl;import Org.hibernate.engine.jdbc.env.spi

As part of ejb3.0, JPA is a good thing. Its simple configuration method and powerful default configuration support make it easy and free to exist between lightweight and weight. If your javaee project is in the Light-weight architecture or heavyweight architecture, if the persistence layer does not use JPA, but uses specialized APIs of some ORM frameworks (such as Hibernate and toplink, in the future, we wi

Mysql Spring Data JPA and native queries with pagination Spring Data and Native Query with pagination public interface UserRepository extends JpaRepository If there is a sort in the Pageable object, sorting can be removed here order by .countQuerycan be omitted. H2The H2 database will be \n#pageable\n changed into a \n-- #pageable\

Spring data is an open-source framework for simplifying database access and supporting cloud services, with the primary goal of making access to data easy and fast. Access to and manipulation of data can be achieved with virtually no write implementation. In addition to CRUD, it also includes some common functions such as paging, sorting, and so on.Interface provided by Spring Data

The purpose of the framework is to simplify operations, improve code utilization, the JDBC way there are many deficiencies, so not the framework required, so SPRINGJPA come forward, it not only has SPRINGJDBC integration, but also has simplified SQL, to achieve paging and other more powerful features.Its implementation is similar to spring JDBC, where its configuration file is gluedIn this case, note 1 and note 5: Automatic scan to find repositories;

the cause of the error in example 6:Because Nativequery = True is specified, a native SQL statement is used to query. It is not right to use the Java object ' book ' as the table name to check nature. Simply replace the book with the table name book.@Query (value = "SELECT * from book B where b.name=?1", Nativequery = True) listSupplementary note (2017-01-12):Some classmates proposed, example 5 with ' #{#entityName} ' Why not get the value ah?First of all, say ' #{#entityName} ' What the hell i

1. Use of repository objects in the project2.Repository introduced in two waysInheritance and use annotationsDefinition of the 3.Repository interfaceThe Repository interface is a core interface of Spring Data and does not provide any methods, and developers need to declare the required methods in their own defined interfaces.public interface RepositoryT, ID extends Serializable> { } Hierarchical relationship of 4.Repository interfacesThe underlying Re

Based on Spring Boot, use JPA to call the stored procedures of the SQL Server database and return a set of records. springjpa In the previous article "using Spring Boot and JPA to operate SQL Server database to complete CRUD", we completed the CRUD operation on Object Data Using JP