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69

isNull()

Method javax.persistence.criteria.Expression Predicate isNull() Create a predicate to test whether the expression is null. Returns: predicate testing whether the expression is null Since: JPA 2.0
69

isNotNull()

Method javax.persistence.criteria.Expression Predicate isNotNull() Create a predicate to test whether the expression is not null. Returns: predicate testing whether the expression is not null Since: JPA 2.0
68

in(values)

Method javax.persistence.criteria.Expression Predicate in( Object... values ) Create a predicate to test whether the expression is a member of the argument list. Parameters: values - values to be tested against Returns: predicate testing for membership Since: JPA 2.0
68

in(values)

Method javax.persistence.criteria.Expression Predicate in( Collection<?> values ) Create a predicate to test whether the expression is a member of the collection. Parameters: values - collection of values to be tested against Returns: predicate testing for membership Since: JPA 2.0
67

javax.persistence.criteria.CriteriaBuilder

selections, expressions, predicates, orderings. Note that Predicate is used instead of Expression in ... . Expression<N> abs( Expression<N> x) Create an expression that returns the absolute value of its argument. Create an expression that returns the absolute value of its argument. Parameters: x
63

Numbers in JPQL and Criteria Queries

parameters - when numeric values are assigned as arguments. as path expressions - in navigation to persistent numeric fields. as aggregate expressions - e.g. COUNT. as collection functions ... .g. LOCATE, LENGTH. as composite arithmetic expressions that use operators and functions to combine
49

Strings in JPQL and Criteria Queries

parameters - when string values are assigned as arguments. as path expressions - in navigation ... for a match (usually a path expression) and the right operand is always the pattern (usually a parameter or ... '%\%' ESCAPE '\' is evaluated to FALSE. In the expressions above only the first percent character
44

Paths and Types in JPQL and Criteria API

classes) are represented in JPQL by the following types of expressions: Variables - FROM ... as arguments. Path expressions that navigate from one object to another. Instances of user defined ... . But more often they are used in JPQL path expressions that navigate to values of simple types (number, boolean
41

ORDER BY clause (JPQL / Criteria API)

Expressions The following query returns names of countries whose population size ... . Then the SELECT clause builds the results by evaluating the result expressions. Finally the results are ordered by evaluation of the ORDER BY expressions. Only expressions that are derived directly
4

[ODB1] Chapter 7 - JDOQL Queries

a persistent class) A filter, which is a boolean expression in a Java like syntax The query result ... other optional components, such as parameters, variables and import and order expressions ... the iterated object. Only instances for which the evaluation of the filter expression is true

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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