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JPA Query Expressions (JPQL / Criteria)

/ Criteria Variables JPQL / Criteria Parameters JPQL / Criteria Literals Every query expression consists

JPA Queries

variables, join and fetch): Other criteria query expressions (for all the query clauses):

Obtaining a JPA Database Connection

variable represents the ObjectDB home directory (by default - the directory in which ObjectDB

JPA Metamodel API

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

combined index not used

:notNull])) <x> v$1:bound(a.objectsInCharge))" eval="4.9675" variable="v$1 ... -07-20->3_3_0:notNull]))" eval="2.9675" variable="a"> <btreePlan plan="index(esst[3_3_0_2018-07-20->3_3_0:notNull])" eval="0.9675" variable

[ODB1] Chapter 8 - ObjectDB Server

are inherited except the name attribute. The $user variable (in the path attribute of $standard

[ODB1] Chapter 9 - ObjectDB Explorer

of the query. Optional JDOQL components, such as filter, parameters, variables, ordering and imports (chapter

[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

addSubquery(sub, variableDeclaration, candidateCollectionExpression, parameters)

include the candidate class, filter, parameter declarations, variable declarations, imports, ordering ... of the variable containing the results of the subquery execution. If the same value of variableDeclaration ... variable. If the subquery parameter is null, the variable is unset, effectively making the variable


of the Query; and for all variables there exists a value for which the filter expression evaluates to true ... for the evaluation of the current set of variable values. Other values for variables might still qualify ... (Collection types) is specified using a variable declaration and the Collection.contains(Object o

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.

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