ObjectDB Database Search

A named query is a statically defined query with a predefined unchangeable query string. Using named queries instead of dynamic queries may improve code organization by separating the JPQL ... whose name is  "Country.findAll" that retrieves all the  Country objects in the database

country names as String instances, rather than Country objects: SELECT c. name FROM Country AS c Using path expressions , such as c. name , in query results is referred to as projection. The field values ... c. name FROM Country AS c", String.class); List results = query. getResultList (); Only singular

execution, because it eliminates the need for repeated query compilations. Named Parameters (: name ) The following method retrieves a Country object from the database by its name : public Country getCountryByName( EntityManager em, String name ) { TypedQuery query = em. createQuery ( "SELECT c FROM

... ... A element has two roles: If the optional new- name attribute is specified, the package name is changed from the original name , which is specified by the required name attribute, to the new name . All the classes in that package are moved to the new package name . In addition, whether or not a new

, and the same query can also be written as follows: SELECT c FROM Country c By default, the name of an entity class in a JPQL query is the unqualified name of the class (e.g. just Country with no package name ). The default name can be overridden by specifying another name explicitly in the @Entity 's

Expressions The following query returns names of countries whose population size is at least one million people, ordered by the country name : SELECT c. name FROM Country c WHERE c.population 1000000 ORDER BY c. name When an ORDER BY clause exists it is the last to be executed. First the FROM clause

, package or private) and it can be either concrete or abstract. Entity Class Names Entity classes are represented in queries by entity names . By default, the entity name is the unqualified name of the entity class (i.e. the short class name excluding the package name ). A different entity name

  name ,     Query  query ) Define the query, typed query, or stored procedure query as a named query such that future query objects can be created from it using the EntityManager ... of the query object (except for actual parameter binding) in effect when the named query is added

JPA Annotation Attribute in jakarta.persistence.JoinColumn String name default "" (Optional) The name of the foreign key column. The table in which this column is found depends on the context ... is used): The concatenation of the following: the name of the referencing relationship property or field

;String  name ) Return the Set-valued attribute declared by the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: declared SetAttribute of the given name Throws: IllegalArgumentException - if attribute of the given name is not declared in the managed type Since: JPA 2.0

(   String  name ) Return the Collection-valued attribute declared by the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: declared CollectionAttribute of the given name Throws: IllegalArgumentException - if attribute

  name ) Return the Set-valued attribute of the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: SetAttribute of the given name Throws: IllegalArgumentException - if attribute of the given name is not present in the managed type Since: JPA 2.0

; String  name ) Return the Collection-valued attribute of the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: CollectionAttribute of the given name Throws: IllegalArgumentException - if attribute of the given name is not present in the managed type Since: JPA 2.0

(   String  name ) Return the single-valued attribute of the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: single-valued attribute with the given name Throws: IllegalArgumentException - if attribute of the given name is not present in the managed type Since: JPA 2.0

getDeclaredSingularAttribute (   String  name ) Return the single-valued attribute declared by the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: declared single-valued attribute of the given name Throws: IllegalArgumentException

;String  name ) Return the Map-valued attribute declared by the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: declared MapAttribute of the given name Throws: IllegalArgumentException - if attribute of the given name is not declared in the managed type Since: JPA 2.0

  name ) Return the Map-valued attribute of the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: MapAttribute of the given name Throws: IllegalArgumentException - if attribute of the given name is not present in the managed type Since: JPA 2.0

  name ) Return the List-valued attribute of the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: ListAttribute of the given name Throws: IllegalArgumentException - if attribute of the given name is not present in the managed type Since: JPA 2.0

; String  name ) Return the List-valued attribute declared by the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: declared ListAttribute of the given name Throws: IllegalArgumentException - if attribute of the given name is not declared in the managed type Since: JPA 2.0

; String  name ,    Class  elementType ) Return the List-valued attribute declared by the managed type that corresponds to the specified name and Java element type. Parameters: name - the name of the represented attribute elementType - the element type of the represented

;String  name ,    Class  elementType ) Return the Set-valued attribute declared by the managed type that corresponds to the specified name and Java element type. Parameters: name - the name of the represented attribute elementType - the element type of the represented

  name ,    Class  elementType ) Return the List-valued attribute of the managed type that corresponds to the specified name and Java element type. Parameters: name - the name ... : ListAttribute of the given name and element type Throws: IllegalArgumentException - if attribute

  name ,    Class  elementType ) Return the Set-valued attribute of the managed type that corresponds to the specified name and Java element type. Parameters: name - the name ... : SetAttribute of the given name and element type Throws: IllegalArgumentException - if attribute

; String  name ,    Class  elementType ) Return the Collection-valued attribute of the managed type that corresponds to the specified name and Java element type. Parameters: name - the name of the represented attribute elementType - the element type of the represented

(   String  name ,    Class  elementType ) Return the Collection-valued attribute declared by the managed type that corresponds to the specified name and Java element type. Parameters: name - the name of the represented attribute elementType - the element type

; String  name ) Return the attribute declared by the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: attribute with given name Throws: IllegalArgumentException - if attribute of the given name is not declared in the managed type Since: JPA 2.0

;String  name ) Return the attribute of the managed type that corresponds to the specified name . Parameters: name - the name of the represented attribute Return: attribute with given name Throws: IllegalArgumentException - if attribute of the given name is not present in the managed type Since: JPA 2.0

  name ,    Class  keyType,    Class  valueType ) Return the Map-valued attribute of the managed type that corresponds to the specified name and Java key and value types. Parameters: name - the name of the represented attribute keyType - the key type

;String  name ,    Class  keyType,    Class  valueType ) Return the Map-valued attribute declared by the managed type that corresponds to the specified name and Java key and value types. Parameters: name - the name of the represented attribute keyType

JPA Annotation Attribute in jakarta.persistence.NamedEntityGraph String name default "" (Optional) The name used to identify the entity graph in calls to EntityManager.getEntityGraph . If no name is explicitly specified, the name defaults to the entity name of the annotated root entity. Entity

(   String  name ,    Class  type ) Return the single-valued attribute of the managed type that corresponds to the specified name and Java type. Parameters: name - the name of the represented attribute type - the type of the represented attribute Return: single-valued

getDeclaredSingularAttribute (   String  name ,    Class  type ) Return the single-valued attribute declared by the managed type that corresponds to the specified name and Java type. Parameters: name - the name of the represented attribute type - the type of the represented attribute Return

JPA Method in jakarta.persistence.Query Parameter getParameter (   String  name ) Get the parameter object corresponding to the declared parameter of the given name . This method is not required to be supported for native queries. Parameters: name - parameter name Return: parameter

JPA Method in jakarta.persistence.Query Parameter getParameter (   String  name ... of the given name and type. This method is required to be supported for criteria queries only. Parameters: name - parameter name type - type Return: parameter object Throws: IllegalArgumentException

JPA Method in jakarta.persistence.Query Object getParameterValue (   String  name ) Return the input value bound to the named parameter. (Note that OUT parameters are unbound.) Parameters: name - parameter name Return: parameter value Throws: IllegalStateException - if the parameter

JPA Method in jakarta.persistence.Query Query setParameter (   String  name ,  ... an instance of java.util.Calendar to a named parameter. Parameters: name - parameter name value - parameter ... - if the parameter name does not correspond to a parameter of the query or if the value argument is of incorrect type Since: JPA 1.0

JPA Method in jakarta.persistence.Query Query setParameter (   String  name ,    Object value ) Bind an argument value to a named parameter. Parameters: name - parameter name value - parameter value Return: the same query instance Throws: IllegalArgumentException

JPA Method in jakarta.persistence.Query Query setParameter (   String  name ,  ... of java.util.Date to a named parameter. Parameters: name - parameter name value - parameter value ... - if the parameter name does not correspond to a parameter of the query or if the value argument is of incorrect type Since: JPA 1.0

; name ,    Object value ) Bind an argument value to a named parameter. Parameters: name - parameter name value - parameter value Return: the same query instance Throws: IllegalArgumentException - if the parameter name does not correspond to a parameter of the query or if the argument is of incorrect type Since: JPA 2.0

; String  name ,    Date value,     TemporalType  temporalType ) Bind an instance of java.util.Date to a named parameter. Parameters: name - parameter name value - parameter value temporalType - temporal type Return: the same query instance Throws

; String  name ,    Calendar value,     TemporalType  temporalType ) Bind an instance of java.util.Calendar to a named parameter. Parameters: name - parameter name value - parameter value temporalType - temporal type Return: the same query instance

; String  name ,    Object value ) Bind an argument value to a named parameter. Parameters: name - parameter name value - parameter value Return: the same query instance Throws: IllegalArgumentException - if the parameter name does not correspond to a parameter of the query

; name ,    Date value,     TemporalType  temporalType ) Bind an instance of java.util.Date to a named parameter. Parameters: name - parameter name value - parameter ... - if the parameter name does not correspond to a parameter of the query or if the value argument is of incorrect type Since: JPA 2.0

; name ,    Calendar value,     TemporalType  temporalType ) Bind an instance of java.util.Calendar to a named parameter. Parameters: name - parameter name value ... : IllegalArgumentException - if the parameter name does not correspond to a parameter of the query or if the value argument is of incorrect type Since: JPA 2.0

JPA Annotation Attribute in jakarta.persistence.Entity String name default "" (Optional) The entity name . Defaults to the unqualified name of the entity class. This name is used to refer to the entity in queries. The name must not be a reserved literal in the Jakarta Persistence query language. Since: JPA 1.0

; name ) Create an instance of Query for executing a named query written in the Jakarta Persistence query language or in native SQL. Parameters: name - the name of a query defined in metadata Return ... with the given name or if the query string is found to be invalid See Also: NamedQuery NamedNativeQuery Since: JPA 1.0

JPA Annotation Attribute in jakarta.persistence.PrimaryKeyJoinColumn String name default "" (Optional) The name of the primary key column of the current table. Defaults to the same name as the primary key column of the primary table of the superclass ( JOINED mapping strategy); the same name as

  name ,    Class  resultClass ) Create an instance of TypedQuery for executing a Jakarta Persistence query language named query. The select list of the query must contain ... : name - the name of a query defined in metadata resultClass - the type of the query result Return

JPA Annotation Attribute in jakarta.persistence.CollectionTable String name default "" (Optional) The name of the collection table. If not specified, it defaults to the concatenation of the name of the containing entity and the name of the collection attribute, separated by an underscore. Since: JPA 2.0

JPA Method in jakarta.persistence.criteria.CriteriaBuilder ParameterExpression parameter (   Class  paramClass,    String  name ) Create a parameter expression with the given name . Parameters: paramClass - parameter class name - name that can be used to refer to the parameter Return: parameter expression Since: JPA 2.0