Is it possible to stop spring JPA from generating table for a specific entity ?
Reason:
I want to put all my native sql queries into a separate object using #NamedNativeQuery. But #NameNativeQuery requires #Entity annotation. Due to that, and unwanted table is generated automatically.
Is it possible to add an #Entity, and stop at the same time spring boot to generate table for that entity ?
P.S: I don't want to put the queries into the parent #entity, because there are too many queries. I want to have a good model structure.
My settings :
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=none
Spring Boot version : 2.3.3
Hibernate version : 5.6.7.Final
Related
Can we use multiple datasources with jdbi.
Will the configuration will be same as what we have with JPA : https://www.baeldung.com/spring-data-jpa-multiple-databases
So, in first, you can set more than one database for your application with JDBI, exactely like JDBC. You just have to set them inside your application.properties.
Second, if you want to use JDBI, you'll use a kind of classical queries, instead of a dialect for JPA/hibernate inside repositories.
You can read this discussion to compare them : Benchmarking spring data vs JDBI in select from postgres Database
Have a situation where I need to use single JPA Entity class for different databases.
I have used #Nationalized annotation on fields to support I18N. I need this #Nationalized annotation applicable only when I use oracle as my database. If I use same code for other databases it should not be consider(eg: derby)
is there any mechanism to achieve this in hibernate
I am trying to validate database schema before running any queries using jdbc template. So is there any way to identify schema changes before making any queries in spring programmatically?? Currently I am using spring boot 2 and hibernate 5.
Add this to the configuration file.
hibernate.hbm2ddl.auto=validate
If the value is validated then hibernate only validates the table structure- whether the table and columns have existed or not. If the table doesn’t exist then hibernate throws an exception.
Validate is the default value for hbm2ddl.auto.
I have tried the following
liquibase:generateChangeLog - It generated the change log from my db.I need to generate the change-log from my JPA entities.
liquibase:diff - It generates the change log for the difference between my db and JPA entities. I cannot say that my db is always empty and I want to generate the create scripts which can be applied on fresh db.
How can I use Liquibase to generate the scripts based on my JPA entities only ?
Note : I am ok in providing the details about my db such as url,driver etc
If your IDE of choice is IntelliJ IDEA, I'd recommend using the JPA Buddy plugin to do this. It can generate Liquibase changelogs by comparing your Java model to the target DB.
So if your DB is empty, you'll get a changelog that describes your whole model. But it is also useful to keep your evolving model and your changelogs in sync.
Once you have it installed and have Liquibase as your Maven/Gradle dependency, you can generate a changelog like this:
Try to use liquibase-hibernate-plugin
You have to create a schema with persistence properties according to Database Schema Creation and then use the Liquibase generateChangeLog command.
I am using Hibernate & Spring In my project. I need to access already existing table values from DB using hibernate.
I just have an entity class & I use Constructor injection here.
I am Using Hibernate & spring in same file.
Hibernate allows to generate beans and mapping configuration out of existing databases. This is called `Reverse Engineering'.
You can find the documentation here:
http://docs.jboss.org/tools/latest/en/hibernatetools/html/reverseengineering.html