About primary key

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2

World database - Changing country ID

to change field which is primary key? If so what am I doing wrong? Thanks Changing the primary key ... it. If you have to change the primary key you should create a new entity object with the new primary key and delete the old entity object (and of course, update relevant references). Regarding the primary key in
Manual
2

FROM clause (JPQL / Criteria API)

, IN, INDEX, INNER, IS, JOIN, KEY, LEADING, LEFT, LENGTH, LIKE,LOCATE, LOWER, MAX, MEMBER, MIN, MOD
Manual
2

Database Schema Evolution

long as the keys and values are convertible (e.g. from HashMap to TreeMap). Any
Result
2

About ObjectDB Database

, etc.) but in a way that makes development easier and applications faster. ObjectDB Database Key Features
Result
2

About ObjectDB Database [2017-10-24]

, etc.) but in a way that makes development easier and applications faster. ObjectDB Database Key Features
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2

Can't modify @EmbeddedId in ObjectDB Explorer

a primary key before persisting an entity, and it cannot be modified later. Therefore replacing a primary key requires creating a new entity object with the new primary key, copying the content ... to keep primary keys fixed (in RDBMS too). Accordingly, currently this feature has a low priority. zmirc
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2

Mismatch client-server protocol prefix

it's happening. com.objectdb.o.UserException: Attempt to reuse an existing primary key value ... - it is weird, thanks for updating. The "Attempt to reuse an existing primary key value" exception is thrown ... ago but the primary key exception raises every few calls of our logging method. The cause is unclear
JPA Doc
2

MapKeyJoinColumn.name

of the foreign key column for the map key. The table in which it is found depends upon the context. If the join is for a map key for an element collection, the foreign key column is in the collection table for the map value. If the join is for a map key for a ManyToMany entity relationship or for a OneToMany
JDO Doc
2

javax.jdo.Query

should be a String containing a SQL SELECT statement. Since: JDO 2.0   void addExtension(String key ... to this query. The key and value are not standard. An implementation must ignore keys that are not recognized. Parameters: key - the key of the extension value - the value of the extension Since: JDO 2.0 void
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2

Slow searching with two indexes

- one is the primary key (id) and so is different for each object, and the other is an object reference that only has a few tens of different values.   When I query by just the primary key, it's (of course) extremely ... to get candidates for querying the primary key.  This is the slow part.   I'm looking for a way to optimise