spring data jpa example

1.JPQLA. Definition: Java Persistent Query Language (JPQL) is a portable query language designed to bind SQL syntax and simple query semantics together in an expression of an object-oriented expression language • Queries written in this language are portable and can be compiled into SQL on all major database servers.B. Statement:Select from User where u.userid=?2. One-to-one (Onetoone)The A.userinfo class has the user attribute (contains the user_id foreign key) @OneToOne @JoinColumn (nam

JPQL as follows:true ) @Query ("UPDATE synctestfromtkdo SET Stuans = ' where typeId =? 1")publicvoid Updatestuans (Integer typeid);Project run times error, hint:executing an update/delete query; nested exception is Javax.persistence.TransactionRequiredExceptionReason:Update, delete operation involves a transaction mechanism and needs to be setWorkaround:Add the annotation @transactional (import org.springframework.transaction.annotation.Transactional;) to the service class calling this method.[

Controller layer1@RequestMapping (value= "/search")2 @ResponseBody3 PublicString Search (HttpServletRequest request,intPageIndex,intsize) {4HttpSession session =request.getsession ();5User user = (user) Session.getattribute ("user"));6pageOnlinemessageservice.pagefind (user,pageindex, size);7mapNewHashmap();8Tablemap.put ("Total", Page.gettotalelements ());9Tablemap.put ("Messages", Page.getcontent ());Ten returnresponsejson.instance (). SetData (Tablemap). ToJSON (); One A}Service

;ImportOrg.springframework.web.bind.annotation.RequestBody;Importorg.springframework.web.bind.annotation.RequestMapping;ImportOrg.springframework.web.bind.annotation.RequestMethod;ImportOrg.springframework.web.bind.annotation.RestController;Importcom.kxh.example.demo.dao.ContactsRepository;Importcom.kxh.example.demo.domain.Contact;ImportCom.kxh.example.demo.service.ContactsService, @RestController @requestmapping ("/contacts") Public classContactscontroller {@Autowired contactsservice contactsse

First, the environment1. This essay is based on the spring data JPA project2. Database for MySQL version 5.7.9Second, the content1. Create a new stored procedure Pro_query_objectBEGIN#Routine body goes here...a_theme_code varchar (), out Num intSelect o.obj_code,o.obj_name,o.obj_id from Qt_object o where O.theme_code=a_theme_code;Select COUNT (*) into num from Qt

The domestic article looked again, actually did not find the fundamental problem solution, the following will enumerate this series of problem solving method: 1. Add the following configuration in the configuration file: spring.jpa.hibernate.naming.physical- strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl 2. Add the following annotations on the entities and attributes, respectively: // Table Name @Table("\"User\"") // field @Column("\"Name\"") Solve f

1, Multi-criteria of accurate query need to customize SQL statement queries at the DAO layer (for example, here is the method name customization)2. Complex query with multiple conditionsFirst, you need the DAO layer to inherit jpaspecificationexecutor (for example)specific implementation Query method in Serviceimpl layer Write call custom methodspecific methods, such asSpring Boot's query that uses

Spring Data JPA supports annotated read-write locks (pessimistic locks), which are actually hard-coded, but SQL based on JPA naming can only add support for read-write locks with annotations.No, you can read and write the lock here.MySQL read-write lock and transactionand recommendPessimistic_read,Pessimistic_write,Ins

The Spring Data JPA is developed based on Hibernate, so building entity and mapping relationships requires a good understanding:------Entity Manager Entity Manager Entitymanager is the entity's Bridge to the database (and the transaction works together), Equivalent to the sqlsession in the Session,mybatis in Hibenrtae. Entity Total 4 states: (Persist for inserti

Tags: EPO query class ace Autowire integer ROM useMore convenient to use than using JDBCTEMPLATE,SPRING-DATA-JPA.1. First UserService inherit Jparepository Public Interface extends Jparepository { User findbyname (String name); User findbynameandage (String name, Integer age); @Query ("from user U where U.name=:name") User finduser (@Param ("name") St

Example code:/** * If the barcode field value is NULL then do not process * If the barcode field value is not null before the original value of the Mosaic del:@param dealer @return * /@Modifying @Transactional @Query ("update Dealer D set "+ " D.deleteflag = 1, "+ " D.barcode = case when D.barcode was NULL then D.barcode ELSE CONCAT (' d El: ', D.barcode) end, "+ " D.outerid = case when D.o

It's been a long time to have a problem today, record it here.After all, it is just beginning to use the JPA technology, always encountering various configuration problems.Using the spring Data JPA is very handy, and some simple operations do not have to write a specific implementation.Just write an interface to inheri

See-----> 791,312,811 in the original. Method 11. Controller layer:The method parameter is as follows, must add "%" +name+ "% "/**@description : Cheng Zhixiang com 2018/1/22 pm 5:15V1.0 */@RestControllerpublic Class Usercontroller { @Autowired private teamrepository teamrepository; @GetMapping ("/findbynamelike") public list2. DAO Layer:Be sure to use the JPA-defined form findby+ parameter name +like (parameter)/**

: Network Disk Download1. Spring Data repositories Spring data repository is used to free you from a large number of repetitive, complex database-level operations. 1.1 Core Concepts The core interface of Spring Data repository is

Tags: obj null his entry ASN RAM data equals. classPackage com.wanda.cms.dao.repository;Import Org.springframework.stereotype.Repository;Import Javax.persistence.EntityManager;Import Javax.persistence.PersistenceContext;Import Javax.persistence.Query;Import Java.math.BigInteger;Import java.util.*;/*** Build Complex queries* @author LCHB*/@Repositorypublic class nativequeryrepository{@PersistenceContextPrivate Entitymanager Entitymanager;/*** Based on

1. The integrated configuration file is as followsSpring Integrated Redis - BeanID= "Poolconfig"class= "Redis.clients.jedis.JedisPoolConfig"> Propertyname= "Maxtotal"value= "+"/> Bean> Configuring Jedisconnectionfactorybean Objects - BeanID= "Jedisconnectionfactory"class= "Org.springframework.data.redis.connection.jedis.JedisConnectionFactory"> Propertyname= "HostName"value= "localhost"/> Propertyname= "Port"value= "6379"/> Propertyname= "Poolconfig"re

There are scenarios where you need to combine queries based on the Check_code field of Table A and the store_code of table B, Check_result field, and the association between table A and B is one-to-many. to simplify the query parameters, we encapsulate the query parameters and draw out the public querycondition: public class Querycondition On the basis of public querycondition, we encapsulate personalized aquerycondition: public class Aquerycondition extends querycondition Since we used A

); @Test Public voidFindcityandhotelallself ()throwsException {PageNewPagerequest (0, 10)); Assert.asserttrue (cityandhotelallself.gettotalelements ()> 0);}5. Dynamic Search for all information about hotels and cities directly return to the entity classIf it is a dynamic query, of course, we have to construct a SQL to query, of course, if it is not a custom entity object, such a lot of online I will not write.Go straight to the test@Autowired @persistencecontext Private Entitymanager Entitymanag

Spring entry --- JPA learning notes, --- jpa learning notes Spring, which has been used for a period of time, is now only in a usable state and does not know much about anything deeper. So I decided to start learning Spring in depth. This document mainly records

implementations should have some sort of data cache to choose from. Hopefully, JPA will become a real standard in the near future. 　　Summary EJB 3.0 and JPA will no doubt be the main selling point of Java EE 5. In some areas, they offer a competitive advantage to the Java community and Briber Java in other areas (because, admittedly, there are no standards-based