About table


Does JPA have any configuration to create DDL's that are database specific

There some JPA classes who's names more that 30 character. This worked well in MySQL , Derby , PostgreSQL but when it was tried on oracle , we hit the constraint that oracle has of 30 characters.   So basically my question is that is there any JPA configuration to create DDL's that are specific to database   ... Maybe what you are looking for is the Table javax.persistence.Table JPA annotation Specifies the primary table for the annotated ...


Logical Operators in JPQL and Criteria API

Explains how to use AND, OR and NOT in JPQL queries.... 2 sets of logical operators, as shown in the following table: Set 1 - JPQL / SQL ... FALSE , and NULL . The following table shows how the AND operator is evaluated based on its two operands: ...



(Optional) The name of the primary key column of the current table.(Annotation Element of javax.persistence.PrimaryKeyJoinColumn)


Using ObjectDB with JDBC (in similar way with JPA 2)

Using JDBC, I can use a String to create the schema of a table: ... Using JDBC, I can use a String to create the schema of a table: String sql = "CREATE TABLE REGISTRATION " + "(id INTEGER not NULL, " + ...



(Optional) The name of the primary key column of the table being joined to.(Annotation Element of javax.persistence.PrimaryKeyJoinColumn)


Unexpected exception (Error 990) on find

I have a huge amount of inserts/updates and after a about 850.000 Entities I got the following error: ... look now like this: @ Entity @ Table ( schema = "ebene1" ) public class ...



Annotation for defining the persistence of a member.(Annotation of JDO)



Defines the types of primary key generation strategies.(Enum of JPA)



Annotation for whether the class or interface is persistence-capable.(Annotation of JDO)


[ODB1] Chapter 1 - About ObjectDB

Describes the main features and editions of ObjectDB 1.0 for Java/JDO. ObjectDB for Java/JDO is a powerful Object Database Management System (ODBMS) written entirely in Java. It can efficiently handle a wide range of database sizes, from a few KBs to hundreds of GBs. It has a small footprint, high performance, and a flexi ...