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.
Tag: jpa
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…
Mapping one DB column to two seperate fields using JPA
I’m developing a code generator that have to generate JPA entities from database meta-model files. These model are from home-brewed modeling system which are being used to generate models other than JPA entities. In these models some fields are mapping back to same database column. But it seems like JPA…
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 is the difference between Transaction manager and Entity Manager
As a student, i read nearly all spring documentation. As far as i understood that spring is configuration monster. Annotation based or Xml based, it doesn’t matter but what i really don’t understand is what is the difference between transaction manager and entity manager. If we have injected entit…
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…
java.lang.IllegalStateException: Multiple representations of the same entity with @ManyToMany 3 entities
I have 3 entities with ManyToMany relationships: Role Entity: Permission Entity: Functionality Entity: I did the following: I have created 3 functionalities: Then created 2 permissions: Then created a role: I am getting the following exception: java.lang.IllegalStateException: Multiple representations of the …
How to log Spring Data JPA repository method execution time?
I have simple Spring Data JPA repository. Is there any way to monitor execution time for methods generated by Spring (for example findOne(…))? Answer The easiest way is to use a CustomizableTraceInterceptor as follows:
How to map a map JSON column to Java Object with JPA
We have a big table with a lot of columns. After we moved to MySQL Cluster, the table cannot be created because of: ERROR 1118 (42000): Row size too large. The maximum row size for the used table type, not counting BLOBs, is 14000. This includes storage overhead, check the manual. You have to change some colu…
%Like% Query in spring JpaRepository
I would like to write a like query in JpaRepository but it is not returning anything : LIKE ‘%place%’-its not working. LIKE ‘place’ works perfectly. Here is my code : Answer The spring data JPA query needs the “%” chars as well as a space char following like in your query, …