About unique

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Manual
12

Retrieving JPA Entity Objects

object can be uniquely identified and retrieved by the combination of its class and its primary key
FAQ
12

Is ObjectDB a NoSQL Database?

ObjectDB is a unique NoSQL database. It doesn't have the known disadvantages and limitations of NoSQL technology, which are weak query capabilities and lack of ACID (atomicity, consistency, isolation, durability). Unlike other NoSQL solutions, ObjectDB provides full support of rich complex queries
Manual
12

JPA Named Queries

carefully to avoid collision (e.g. by using the unique entity name as a prefix). It makes sense
Manual
12

JPA Persistable Types

class MyEntity { } Entity names must be unique. When two entity classes in different packages
Manual
12

Defining a JPA Entity Class [2011-02-11]

, this.y); } } As you can see above, an entity class is an ordinary Java class. The only unique
Manual
12

Defining a JPA Entity Class

, this.y); } } As you can see above, an entity class is an ordinary Java class. The only unique
JDO Doc
10

javax.jdo.Query

of results, and flags indicating whether the query result is unique and whether the query can be modified ... in the type namespace. Imported type names must be unique. When used (e.g. in a parameter declaration ... declareParameters hides the name of a candidate class field of the same name. Parameter names must be unique
JDO Doc
9

javax.jdo.annotations.Element

unique Whether a unique constraint should be generated or assumed. Whether a unique constraint should be generated or assumed. Returns: whether a unique constraint should be generated or assumed Default value: "" Since: JDO 2.1 String uniqueKey The name of the unique key constraint to generate
JDO Doc
9

javax.jdo.annotations.Join

: "" Since: JDO 2.1 String unique Whether the join column is unique. Whether the join column is unique. Returns: whether the join column(s) is(are) is unique Default value: "" Since: JDO 2.1 String uniqueKey The name of the unique key constraint to generate. The name of the unique key constraint to generate
JDO Doc
9

javax.jdo.annotations.Key

Default value: {} Since: JDO 2.1 String unique Whether the element column(s) contents should be considered unique Whether the element column(s) contents should be considered unique Returns: whether the element column(s) contents should be considered unique Default value: "" Since: JDO 2.1 String