is there any method to support my mapping anyways in Hibernate?
I mean to correct my mapping automatically, when changs in Database were made?
The best would be that hibernate woud conform to DB, so DB is leader and Hibernate only maps and dont make any changes.
Example:
Yesterday a Table named "Phones" had the columns:
id
Number
Today that table got a Update and now it looks like:
id
Number
customerID
PhoneListId
is there any option that hibernate correct this automatically?
Related
I've started working on a legacy oracle database and using Spring boot Jpa trying to insert a new row in a table (CHANNELMGR_REQUEST) without Identity:
This table has a Numeric column (CM_ISN) and logically could be an Identity candidate, but I could not touch the database for some reason.
I found an existing sequence (CHANNELMGR_SEQ) that is used for generating value for that CM_ISN column too.
So I decided to use that sequence and added some annotation in my equivalent POJO as follow and mapped to the sequence to that CM_ISN column. But not touching the database :
My repository is like this :
While inserting the row, sucessfully invoke the sequence but get exception as bellow :
My questions :
Is it wrong to modify an entity and add #Id to that which is not in in equivalent table?
What's wrong with my code that i get error?
PS: I'm sorry for putting images instead of actual source codes, The reason is because development machine has no access to the internet.
It's wrong if it is not the primary key
Use BigDecimal instead of Number
I am auditing a Java object using Hibernate Envers annotations, but initial object creation occurs directly in the database using Pentaho (ETL).
I want to create the object using ETL and add a table entry to the Envers generated object_AUD and REVINFO tables.
I have been trying to find the generation strategy for the REV column from the REVINFO table, but I must be looking in the wrong places. Would someone help me find an effective generation strategy so I can manually insert records into the audited tables without causing possible collisions or weird behavior in the future?
What you seek is going to depend on whether or not you are configuring your application to take the default for org.hibernate.envers.use_revision_entity_with_native_id.
The default value (true) tells Envers to ask Hibernate to create the REVINFO table using a native-based primary key which will either be IDENTITY or SEQUENCE depending upon your database platform. If you look at the table definition for REVINFO in your database, you should be able to deduce this information.
If this property is configured using false, Envers will construct its own sequence metadata and provide that to Hibernate. The sequence is called REVISION_NUMBER and is stored in a table called REVISION_GENERATOR. The sequence is initialized to 1 and incremented by 1 as the default.
I have some problem with hibernate. when I add a column age into the file mapping of Client.xml, hibernate update my table client and add the column, but when a delete the same column age from Client.xml and client.java, and I run my application, I found that the column still in my table client.
can anyone have a clue why hibernate couldn't delete the column age from table client
thank you ^_^
Hibernate follow two approach
1. Schema first
2. Code first
In Schema first Java entities are created based on your database design and in Code first approach database is created with all java entities annotated with #Entity.
In your case you are following Code first approach, when you add any new column in java entity hibernate will create column on your behalf if hibernate.hbm2ddl.auto is update. if your database contains more tables hibernate has no issue with it that's why hibernate is not deleting any column if you delete it from Java Entity.
I am new to hibernate and am using xml file for mapping. I want to map more than 8 tables, is it possible or not ?
I am using mysql for DB. In all that mapping examples they use maximum 3 tables in mapping. If I change the value in one table that has to reflect it on to next one.
For Example I am giving the Username in my Employee Table and use that one in my login table. If I am mapping 2 tables it means, the username in employee table can automatically update to my login table. Is this correct ?
And how many tables am I able to map in single xml file.
A hibernate component may be your solution. Also hibernate definitions can be in separate files and hibernate will figure it out.
https://www.google.com/search?q=hibernate+components
I'm interested in getting the "Description" property of a table column. Is it possible to do via Hibernate? I'm using Sql Server 2008.
Edit: I'm trying to map the column description found in information_schema to the corresponding column (JPA column entity)
I think the simplest solution would be mapping of informatio_schema in way that will provide the information for columns. If you are using annotations you easily can access to information like Table name and Column name, that can be used in Criteria to fetch the description.
This is probably re-coding some available feature and non platform depend. But if you will not succeed in research is always some solution.