I have property in my JPA model which is not mapped to any column in the database.
Because of this, the compiler says "column abc cannot be resolved".
Is there any annotation to say that the property is no longer mapped to any DB column, its just kind of utility property in JPA model.
Regards,
Satya
add #javax.persistence.Transient to the property
Related
I wonder how db schema design would look, because at first glance I need bunch sql relation features, that are not available out of box in QuestDB.
No, QuestDB does not support PK, FK and any other constraints yet.
Schema can be same as other relational databases, except the PK values have to be generated by the application. QuestDB will not enforce uniqueness of values in a table column and uniqueness has to come from inserting application.
I have seen several questions and answers on SO, most were three years old or older and I looked at the Django documentation (hoping I didn't miss it). I have to have a 9+ digit number for an id. Most responses were to do this at the database. I am guessing that means to create the model in Django and then go back to the database and change the id column Django created with a new starting/next value attribute on the column.
If not how can I create a database table from Django, Code First, that allows me to create a table with an id column that starts at 100000000? And, it be done with the stock model object methods in Django. I don't really want to do a special hack. If that is the case, I can go the database and fix the column. I was trying to adhere to the Code First ideas of Django (though I prefer database first, and am afraid using inspectdb will make a mess.)
Edit: I didn't want to use UUID. I believe BigAutoField is best.
You should be able to do this in two steps:
1 - Specify your primary key explicitly using primary_key=TRUE in your model definition. See the Django docs for more info. You can then specify BigAutoField or whatever other type you want for the primary key.
2A - If you're populating the database up front, just set pk: 100000000 in your fixture.
OR
2B - If you're not populating the database up front, use Django Model Migration Operations RunSQL as detailed here. For your SQL use ALTER TABLE tableName AUTO_INCREMENT=100000000.
How to delete records using update strategy for the target not having PK informatica?
Set PK in target definition in Informatica even-though if DB doesn't have PK. I am not sure, whether it will work or not.
Create mapping only for delete and in the session property set "treat target rows as" to Delete and choose target table property to "Delete".
You can set PK in the target definition. It should work.
You can define primary key on your Target definition. or you can write target override query if you want to update or delete based on non key values.
I have configured doctrine ORM in my ZF2 project and create doctrine entity of whole database. Now, I have added one more table named dashboard_group in database. How can I create Doctrine entity for only this table.
I don't want to replace other created entities.
Use –filter option in your command :
./vendor//bin/doctrine-module orm:convert-mapping --namespace="YourModule\\Entity\\" --force --from-database --filter="dashboard_group" annotation ./module/MonModule/src/
And then to add setter/getter into the generated entity :
./vendor/bin/doctrine-module orm:generate-entities ./module/YourModule/src/ --generate-annotations=true --filter="dashboard_group"
I am using OpenJPA and HSQLDB for my current project.
But I am unable to generate JPA entities from the HSQLDB because eclipse plugin is not giving me an option to select the schema.
Does anybody have idea about this? Or is there any other way to generate entities in eclipse?
I am assuming that you are using the "standard" JPA tooling (JPT), since you are not specifying otherwise.
First, you need to define a connection (in the Data Source Exlporer). You should be able to drill down and see the actual tables you need to work with:
You select the schema on the "JPA Facet" page when you create the JPA project or activate the JPA Facet: There is a checkbox called "Override default schema from connection", and a combo-box where you select the "Schema":
You can even select the schema when you ask to generate entities (right click on the project, JPA Tools > Generate Entities from Tables...), and then you get this dialog:
Happy Mapping!