About primary key

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4

Composite Index error 328

key. The primary key is automatically indexed and cannot be added to user defined indexes. on mysql , i can make primary key as composite index. I can give secondary index. is  it impossible for objectdb ? Yes, a composite index that includes primary key fields is currently not supported by ObjectDB
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3

How best to unbind all names?

a 'name' field, which may be set as a primary key or as a unique index. This will also solve the orphan ... that it would provide fast lookup, and the bookmark name I use is in fact simply the object primary key (a String ... even on the primary key would be slow. The created schema is in fact recognizing the existence
Forum
3

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
JDO Doc
3

javax.jdo.identity.StringIdentity

(Class pcClass, String key) Constructor with class and key. Constructor with class and key. Parameters: pcClass - the class key - the key Since: JDO 1.0 int compareTo(T arg0) Parameters: arg0 - int ... : true if the class or class name is the same Since: JDO 1.0 String getKey() Return the key. Return
JDO Doc
3

javax.jdo.identity.ObjectIdentity

ObjectIdentity(Class pcClass, Object param) Constructor with class and key. Constructor with class and key. Parameters: pcClass - the class param - the key Since: JDO 1.0 int compareTo(T arg0) Parameters: arg0 ... - the other object Returns: true if the class or class name is the same Since: JDO 1.0 Object getKey() Return the key
Forum
3

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
Forum
3

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
Manual
3

Database Schema Evolution

long as the keys and values are convertible (e.g. from HashMap to TreeMap). Any
Result
3

About ObjectDB Database

, etc.) but in a way that makes development easier and applications faster. ObjectDB Database Key Features
Manual
3

FROM clause (JPQL / Criteria API)

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