ObjectDB ObjectDB

Internal Website Search

41-50 of 200 resultsRefresh
87

General Performance Issues Illustrated with a Specific Method

) { Query qry = getEntityManager().createQuery(jpql); Set<Map.Entry<String, Object>> entries ... model to support these queries. Apparently you have no indexes defined (see this manual page ... (out of the 64GB, you can check it in the Explorer schema tab). You should also run this query with logging
21

JPA Persistable Types

no-arg constructor. cannot be final and cannot have final methods or final instance variables. ObjectDB ... are forbidden). Instance (non static) variables cannot be final, but classes and methods can be final ... are represented in queries by entity names. By default, the entity name is the unqualified name
14

JPA Metamodel API

the above sets extend the Bindable interface, which may be used in defining criteria query variables in
13

javax.persistence.Query

javax.persistence Interface Query Subinterfaces: TypedQuery Interface used to control query execution. Since: JPA 1.0 See Also: TypedQuery Parameter Learn how to define and use JPA/JPQL queries in ... : IllegalStateException - if called for a Java Persistence query language SELECT statement or for a criteria
13

combined index not used

we have a query like this: SELECT a.endDate,a.objectsInCharge.nodePath,a.objectsInCharge ... (see attachment) but in the query plan we can see that this index is not used: Query Plan Description ... and prepare final results. hgzwicker Hans-Georg Zwicker Running the query on the sample database
11

queries under 2.7.6_4 significantly slower than under 2.7.6

indicating deep query plan checks and an overall significant performance loss in all queries ... since version 2.7.6 that could possibly effect query execution. Could you please explain or post some of these logs that show deep query plan checks (and are new in 2.7.6_04)? In addition
2

addSubquery(sub, variableDeclaration, candidateCollectionExpression, parameter)

. Parameters: sub - the subquery to add to this Query variableDeclaration - the name of the variable ... Method javax.jdo.Query void addSubquery( Query sub, String variableDeclaration, String candidateCollectionExpression, String parameter ) Add a subquery to this query. The String version of the method
2

addSubquery(sub, variableDeclaration, candidateCollectionExpression)

Method javax.jdo.Query void addSubquery( Query sub, String variableDeclaration, String candidateCollectionExpression ) Add a subquery to this query. Parameters: sub - the subquery to add to this Query variableDeclaration - the name of the variable in the outer query to bind the results
2

declareImports(imports)

Method javax.jdo.Query void declareImports( String imports ) Set the import statements to be used to identify the fully qualified name of variables or parameters. Parameters and unbound variables might come from a different class from the candidate class, and the names need to be declared in
1

[ODB1] Chapter 5 - JDO Connections

this. It is mainly a matter of style whether or not to use a separate variable to hold the Transaction ... .NontransactionalRead Indicates whether or not database operations that do not modify the database content (queries

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

Need Help?

  1. Search ObjectDB website
  2. Read the FAQ
  3. Follow the Tutorials
  4. View or post in the forum
  5. Search or file an issue
  6. Contact support