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i am using hibernate. it has id column with 20 precisions as below but of NUMBER type.
NUMBER(38,20) - this is the size given to id column of the table(Oracle database).
This id is generated by our application. in entity if i use Float or Double it cannot accommodate 20 precisions. but java.math.BigDecimal can accommodate these many precisions. but the problem is can i use BigDecimal in hbm as below? will there be any problems? some times i may not send id with precisions. that time will hibernate generates any empty precision and inserts?
<id name="someId" column="SOME_ID" type="java.math.BigDecimal"/>
Please suggest!
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This tutorial is helpful to understand about hbm.xml In hibernate, there is two way of mapping - first one is by using hibernate annotation and second one is by using hbm.xml. When you use hbm.xml, just modify default hibernate SessionFactory class in hibernate-cfg.xml by passing your "hbm.xml" file path as an argument to resource method.
Identifiers in Hibernate represent the primary key of an entity. This implies the values are unique so that they can identify a specific entity, that they aren't null and that they won't be modified. Hibernate provides a few different ways to define identifiers. In this article, we'll review each method of mapping entity ids using the library.
This implies the values are unique so that they can identify a specific entity, that they aren't null and that they won't be modified. Hibernate provides a few different ways to define identifiers. In this article, we'll review each method of mapping entity ids using the library. 2. Simple Identifiers
Hibernate will generate an id of the form “8dd5f315-9788-4d00-87bb-10eed9eff566”. 3.2. IDENTITY Generation This type of generation relies on the IdentityGenerator, which expects values generated by an identity column in the database. This means they are auto-incremented. To use this generation type, we only need to set the strategy parameter:
You can use type="big_decimal". Under no circumstances should you even attempt to use Float or Double for this.
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