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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Query expressions are the foundations on which JPQL and criteria queries are built. Every query ... of JPQL / Criteria query expressions. Atomic Expressions The atomic query expressions are: JPQL / Criteria Variables JPQL / Criteria Parameters JPQL / Criteria Literals Every query expression consists
The following interfaces are in use in representing general expressions in criteria queries: See the Query Expressions section for more details and examples.
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
javax.persistence.criteria Interface Expression<T> Superinterfaces: Selection<T>, TupleElement<T ... , ParameterExpression, Path, PluralJoin, Predicate, Root, SetJoin, Subquery Type for query expressions. Since: JPA 2.0 Learn how to use JPA Criteria API's Expression in Chapter 4 of the ObjectDB/JPA manual
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
Method javax.persistence.criteria.Expression Expression<X> as( Class<X> type ) Perform a typecast upon the expression, returning a new expression object. This method does not cause type conversion ... - intended type of the expression Returns: new expression of the given type Since: JPA 2.0
Method javax.persistence.criteria.CriteriaBuilder SimpleCase<C,R> selectCase( Expression<?> expression ) Create a simple case expression. Parameters: expression - to be tested against the case conditions Returns: simple case expression Since: JPA 2.0
Method javax.persistence.criteria.Subquery Subquery<T> select( Expression<T> expression ) Specify the item that is to be returned as the subquery result. Replaces the previously specified selection, if any. Parameters: expression - expression specifying the item that is to be returned as
Method javax.persistence.criteria.CriteriaBuilder In<T> in( Expression<?> expression ) Create predicate to test whether given expression is contained in a list of values. Parameters: expression - to be tested against list of values Returns: in predicate Since: JPA 2.0
Method javax.persistence.criteria.Expression Predicate in( Expression... values ) Create a predicate to test whether the expression is a member of the argument list. Parameters: values - expressions to be tested against Returns: predicate testing for membership Since: JPA 2.0