About unique

141-150 of 151Refresh
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type.loader java.lang.ClassNotFoundException

about unique primary keys/ids on initial startup entity creation/wiring). Q: Is there anywhere else I
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Using multiple databases

Is it possible for an ObjectDB PersistenceManger/EntityManager to connect to more than one database at a time? Also, can objects in one database reference objects in another database (e.g. through globally unique identifiers)? You can use as many databases as needed at the same time but each
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using objectdb.jar in writing data to mariadb or mysql db

to mariadb or mysql using native java JPA API and in some cases JPQL or must i store to an Objectdb unique
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Updating existing persistence entries

row in the DB by the matching and unique ID field. Is there a similar option für ObjectDB? If I
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IN expression in a Criteria Query

that are used for grouping (each group has unique value combination). Aggregate calculations (count, sum
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Query can't see recently persisted object

( { @Index( name = "MyClass_ind_1", members = { "oid" }, unique = "true
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how to create only table structure.

hi, I want to create only a table without insertions of data. And also table contains constraints like not_null, unique, primary key etc. Ex: (In sql) create table emp (id int(5) primary key, name varchar2(20)); , so it will create only table. when we want to see the table structure then "desc emp
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is JDO field attribute "indexed" supported?

" indexed="unique"...> or indexed="true". It doesn't seem to be mentioned on the JDO annotations
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[ODB1] Chapter 4 - JDO Metadata

identity supported by ObjectDB. To enforce unique values in a field you can define a unique index as ... that every String or Date is stored as a non embedded object (with a unique object ID). The embedded-key ... indexes for two fields. Field f0 has an ordinary index and field f1 has a unique index. A field
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[ODB1] Chapter 6 - Persistent Objects

its containing object). 6.2  Object IDs and Names Identifying database objects by unique IDs and by names ... ObjectDB assigns a unique numeric ID to every persistent object when it is first stored in ... the object exists in the database. If an object is deleted from the database, its unique ID