About expression

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JPA Doc
74

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
JPA Doc
74

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
JPA Doc
73

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
JPA Doc
73

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
Manual
54

SELECT clause (JPQL / Criteria API)

objects. JPA 2 adds the ability to use almost any valid JPQL expression in SELECT clauses ... - JPQL does not support the "SELECT *" expression (which is commonly used in SQL). Projection of Path Expressions JPQL queries can also return results which are not entity objects. For example
Manual
53

Date and Time in JPQL and Criteria Queries

Date and time expressions may appear in JPQL queries: as date and time literals - e.g. {d '2011-12 ... expressions - in navigation to persistent date and time fields. as results of predefined JPQL current date and time functions. Current Date and Time JPA defines special JPQL expressions
Manual
50

GROUP BY and HAVING clauses

which returns the first letters as result. ObjectDB is very flexible in allowing JPQL expressions anywhere in ... . Only identification variables and path expressions are currently supported in the GROUP BY clause by ... that are in use by countries in that group. The DISTINCT keyword in a COUNT aggregate expression
Manual
44

JPA Criteria API Queries

, the range variable, c, is also used in the SELECT clause as the query result expression ... on how to set criteria query clauses and build criteria expressions. Running this query requires ... , including in the context of string based JPQL queries. Criteria Query Expressions JPA query clauses
Manual
36

FROM clause (JPQL / Criteria API)

at the WHERE clause level by using a type expression. For example, in the following query, c iterates ... variable that serves as a root and additional join variables that are bound to path expressions. Join variables can also be bound to path expressions that are based on other join variables
JPA Doc
32

javax.persistence.criteria.Subquery

javax.persistence.criteria Interface Subquery Superinterfaces: AbstractQuery, Expressionexpression as its selection item. Since: JPA 2.0 Selection alias(String ... Returns: selection item Since: JPA 2.0 Expression as(Class type) Perform a typecast