About primary key

191-200 of 200Refresh
Forum
3

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
JDO Doc
2

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
2

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
2

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
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
Forum
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