I was wondering is it possible to create from jpa/hibernate annotation a database column description/comment like this: ALTER TABLE tablename CHANGE status status INT(11) NOT NULL COMMENT ‘sample description/comment’; It will be great functionality, but I cant find anything about this in JPA speci…
Tag: hibernate
Spring boot JPA insert in TABLE with uppercase name with Hibernate
i have a table entity mapped as : When i try to insert new record in database, the table name was translated in lowercase as : items_to_register , but my table name is ITEMS_TO_REGISTER How can i fix my problem without change MySql configuration? (my.cnf) I have in my application.properties file : Answer On h…
How Spring @Autowired binds the SessionFactory object even if there is no SessionFactory instance available
I’m using Hibernate and Spring with Java-based configurations. My config file is this one: Working fine. No problem with this, but when I manually try to set the sessionfactory parameter for trasactionManager, like this: The IDE is showing: So, I created a sessionFactory like below and passed to trasact…
How to count number of rows using JPA?
I try to count number of rows using JPA.I want to use where clause however I can’t. How can I set where clause forexample where age=”45″. Thanks in advance. Answer Use ParameterExpression. Note: Untested. Reference.
No Dialect mapping for JDBC type: 1111
I’m working on a Spring JPA Application, using MySQL as database. I ensured that all spring-jpa libraries, hibernate and mysql-connector-java is loaded. I’m running a mysql 5 instance. Here is a excerpt of my application.properties file: When executing an integration test, spring startsup properly…
How to avoid two different threads read the same rows from DB (Hibernate and Oracle 10g)
Let’s suppose I got two different threads, T1 and T2, accessing concurrently the same database and fetching data from the same table. Now on thread startup I need to fetch data from the table and store the rows into a collection, that I will then use to perform some work elsewhere. I don’t want th…
Spring MVC request and response flow explanation
I can’t find correct client request flow in below syntax.Could someone please clarify what is happening here? If possible please specify what are the corresponding spring classes/interfaces used in spring MVC process. Answer Request will be received by DispatcherServlet. DispatcherServlet will take the …
Detached entity passed to persist when save the child data
I’m getting this error when submitting the form: org.hibernate.PersistentObjectException: detached entity passed to persist: com.project.pmet.model.Account; nested exception is javax.persistence.PersistenceException: org.hibernate.PersistentObjectException: detached entity passed to persist: com.project…
MySQL to Hibernate datatype mapping for type “YEAR”
There’s a column in our database which needs to be of type YEAR. What is the corresponding Hibernate mapping for the entity? Tried searching all over, but unable to find the details. I am not sure if I need to use anything from @Temporal or any other specific type. We are using Hibernate ORM v4.1.7. Ans…
What does Hibernate @Proxy(lazy = false) annotation do?
I was facing two different stack traces (see below) when trying to serialize my ESRBRating object which is a JPA entity. I am using Spring Data JPA. The controller called the service, service called the repository. I was able to resolve the issue by adding @Proxy(lazy = false) on my ESRBRating object. My main…