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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.

does not support regular expressions in queries, so currently you cannot use regular expressions in ... so you can use regular expressions in queries, just use string-based JPQL ("e.g. e.field.matches(regexp)") instead of criteria queries. support Support ... I'm struggling to understand how to use the matches method on the String class when using regular

' , ''. as parameters - when string values are assigned as arguments. as  path expressions - in ... is always the string to check for a match (usually a path expression ) and the right operand is always the pattern ... ;is evaluated to TRUE . '100' LIKE '%\%' ESCAPE '\' is evaluated to FALSE . In the expressions

The JOIN FETCH expression is not a regular JOIN and it does not define a JOIN variable. Its only purpose ... 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

, -12.5 . as 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 ... value is numeric, e.g. LOCATE, LENGTH. as composite arithmetic expressions that use operators

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

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 from

the ability to use almost any valid JPQL expression in SELECT clauses. Specifying the required query ... the "SELECT *" expression (which is commonly used in SQL). Projection of Path Expressions JPQL ... path expressions , such as c.name , in query results is referred to as projection. The field values

Date and time expressions may appear in JPQL queries: as date and time literals - e.g. {d '2011-12 ...   path 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

expressions . Ordinary Literals The main method, literal , takes a Java object and returns a literal expression . For example: // Boolean literals: Expression t = cb. literal (true); Expression f = cb. literal (Boolean.FALSE); // Numeric literals: Expression i1 = cb. literal (1); Expression i2 = cb

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 all the JPA ... that are in use by countries in that group. The DISTINCT keyword in a COUNT aggregate expression , as

expression . CriteriaQuery TypedQuery TypedQuery TypedQuery query = em. createQuery (q); List results ... criteria expressions . Running this query requires setting the parameter: TypedQuery query = em. createQuery ... queries. Criteria Query Expressions JPA query clauses are composed of expressions . Because JPQL

expressions out of simple JPQL boolean expressions . Logical Operators ObjectDB supports 2 sets ... part of its JDO support. Criteria Query Logical Operators Boolean Expressions and Predicates Boolean expressions are represented in criteria queries by Expression and descendant interfaces. For example

JPA Interface Expression Type Parameters: - the type of the expression Super Interfaces: Selection , TupleElement Type for query expressions . Since: JPA 2.0 The JPA Query Expressions (JPQL / Criteria) article explains how to use Expression . Public Methods Expression as (Class  type) Perform

. as  path expressions - in navigation to persistent collection fields. IS [NOT] EMPTY ... are treated as synonyms. Criteria Query Collection Expressions JPQL collection operators and functions (which are described above) are available also as JPA criteria query expressions

JPA Method in jakarta.persistence.criteria.CriteriaBuilder Expression concat (   List   expressions ) Create an expression for string concatenation. If the given list of expressions is empty, returns an expression equivalent to literal("") . Parameters: expressions - string

JPA Method in jakarta.persistence.criteria. Expression Expression cast (   Class  type ) Cast this expression to the specified type, returning a new expression object. Unlike as ... expressions to String, and String expressions to Integer, Long, Float, and Double. Support

JPA Method in jakarta.persistence.criteria. Expression Expression as (   Class  type ) Perform a typecast upon the expression , returning a new expression object. Unlike cast ... a runtime failure. Parameters: type - intended type of the expression Return: new expression of the given type See Also: cast Since: JPA 2.0

JPA Method in jakarta.persistence.criteria.CriteriaBuilder Order asc (    Expression   expression ) Create an ordering by the ascending value of the expression . Parameters: expression - expression used to define the ordering Return: ascending ordering corresponding to the expression Since: JPA 2.0

JPA Method in jakarta.persistence.criteria.CriteriaBuilder Order desc (    Expression   expression ) Create an ordering by the descending value of the expression . Parameters: expression - expression used to define the ordering Return: descending ordering corresponding to the expression Since: JPA 2.0

JPA Method in jakarta.persistence.criteria.CriteriaBuilder Order asc (    Expression   expression ,     Nulls  nullPrecedence ) Create an ordering by the ascending value of the expression . Parameters: expression - expression used to define the ordering

JPA Method in jakarta.persistence.criteria.CriteriaBuilder Order desc (    Expression   expression ,     Nulls  nullPrecedence ) Create an ordering by the descending value of the expression . Parameters: expression - expression used to define the ordering

Automatically generated values are mainly useful for primary key fields, but are supported by ObjectDB also for regular (non primary key) persistent fields. At the field level, the @GeneratedValue with an optional GenerationType strategy is specified: The @GeneratedValue annotation

The architecture of this application follows regular SprintBoot principles, but minimized, to match

, JRuby for Ruby and Quercus for PHP). Future direct support of regular Python, JavaScript, C# and other languages is planned.

JPA Method in jakarta.persistence.criteria.CriteriaBuilder CriteriaBuilder.SimpleCase selectCase (    Expression   expression ) Create a simple case expression . Parameters: expression - to be tested against the case conditions Return: simple case expression Since: JPA 2.0

JPA Method in jakarta.persistence.criteria. Expression Predicate equalTo (    Expression  value ) Create a predicate to test whether the expression is equal to the argument. Parameters: value - expression to be tested against Return: predicate testing for equality Since: JPA 3.2

JPA Method in jakarta.persistence.criteria. Expression Predicate notEqualTo (    Expression  value ) Create a predicate to test whether the expression is unequal to the argument. Parameters: value - expression to be tested against Return: predicate testing for inequality Since: JPA 3.2

JPA Method in jakarta.persistence.criteria. Expression Predicate in (    Expression  values ) Create a predicate to test whether the expression is a member of the collection. Parameters: values - expression corresponding to collection to be tested against Return: predicate testing for membership Since: JPA 2.0

JPA Method in jakarta.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 Return: predicate testing for membership Since: JPA 2.0

JPA Method in jakarta.persistence.criteria.CriteriaBuilder CriteriaBuilder.In 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 Return: in predicate Since: JPA 2.0

JPA Method in jakarta.persistence.criteria.Subquery Subquery select (    Expression   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

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

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

JPA Interface CriteriaBuilder Used to construct criteria queries, compound selections, expressions , predicates, orderings. Note that Predicate is used instead of Expression in this API in order ... Criteria API Queries article explains how to use CriteriaBuilder . Public Methods Expression abs

JPA Method in jakarta.persistence.criteria. Expression Predicate notEqualTo (   Object value ) Create a predicate to test whether the expression is unequal to the argument. Parameters: value - value to be tested against Return: predicate testing for inequality Since: JPA 3.2

JPA Method in jakarta.persistence.criteria. Expression Predicate equalTo (   Object value ) Create a predicate to test whether the expression is equal to the argument. Parameters: value - value to be tested against Return: predicate testing for equality Since: JPA 3.2

JPA Method in jakarta.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 Return: predicate testing for membership Since: JPA 2.0

JPA Method in jakarta.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 Return: predicate testing for membership Since: JPA 2.0

to function as a filter. The boolean expression in the WHERE clause, which is also known as the WHERE predicate, defines which objects to accept. Only Country objects for which the predicate expression ... Expressions in WHERE The above queries demonstrate only a small part of the full capabilities

of Expression , any criteria expression  can be used as the SELECT clause content. Multiple selection expressions can be represented by  CompoundSelection , which is itself a subinterface ... interface is a thin wrapper around Expression , which adds order direction - either ascending (ASC) or

which NULL represents an unknown value and expressions that include an unknown value are evaluated as ... IS NOT NULL The expressions above are equivalent (respectively) to the following non standard JPQL (but standard Java and JDOQL) expressions : c.president == null c.president != null Comparable Data

JOIN and JOIN FETCH ). WHERE (with both JPQL and JDOQL expressions ). GROUP BY (including HAVING ... Expressions Path navigation expressions using the dot (.) operator. Comparison operators (

number ( 0 for the first page), the following expression retrieves the results for a specified page ... (); These methods can be invoked in a single expression with getResultList since the setter methods

), so invocation of getSingleResult can be chained to the same expression . Named parameters can be easily ... as is. Instead of a simple country name, a malicious user may provide JPQL expressions that change

disclaims on behalf of all Contributors all warranties and conditions, express and implied, including ... , THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER EXPRESS OR

supported. The SET clause defines one or more field update expressions (using the range variable name - if defined). Multiple field update expressions , separated by commas, are also allowed

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