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Issue
15

Deleting a broken reference that was fixed to null in the Explorer

Using version 2.7.4_01, we did a repair. After repair a former link to a missing reference was converted to null. This cannot be deleted using explorer   Thank you for this report. Build 2.7.4_02 fixes the issue. hgzwicker
Manual
15

Database Explorer

> Set Reference > Set to Null command is used to set a reference to null. The Edit > Set Reference ... command depends on the context. Deleting a reference field sets the value to null without deleting any ... to Collection > Add Null command is used to add a null value. The Edit > Add to Collection > Add Existing Entity
Forum
14

Objectdb ignores not null annotations

Objectdb ignores not null annotations
Manual
13

FROM clause (JPQL / Criteria API)

have any matching inner value it gets at least a NULL value as a matching value in the FROM iteration. Therefore, a Country c with no Capital city has a minimum representation of (c, NULL) in the FROM ... JOIN variant returns Nauru with a NULL value as its capital. [LEFT [OUTER] | INNER] JOIN FETCH JPA
Manual
13

JPA Entity Fields

. When an entity object is stored in the database every persistent field must contain either null or a value ... is persistable (or null). Every persistent field can be marked with one of the following annotations ... the default behavior. null values are allowed by default. Specifying optional=false (as demonstrated
Manual
11

Database Schema Evolution

with default values (0, false or null). Fields in the old schema that do not have matching fields in the new ... with a default value (0, false or null). The following type conversions are supported: From any numeric type ... that are stored as numeric ordinal values (the default). From any type to Boolean or boolean (0, null