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getGroupRestriction () Return the predicate that corresponds to the restriction(s) over the grouping items, or null ... () Return the predicate that corresponds to the where clause restriction(s), or null if no restrictions ... of the query, or null if no selection has been set. Returns: selection item. Since: Jakarta Persistence

, or null if no restrictions have been specified. Inherited from AbstractQuery Returns: having clause ... getRestriction () Return the predicate that corresponds to the where clause restriction(s), or null ... Persistence (JPA) 1.0 Selection getSelection () Return the selection of the query, or null

() Get the current lock mode for the query. Returns null if a lock mode has not been set on the query ... () Execute a SELECT query that returns a single untyped result. Returns: the result, or null ... - the timeout, in milliseconds, or null to indicate no timeout Returns: the same query instance

until after the database insert has occurred. Returns null if the entity does not yet have an id. Parameters: entity ... until after the database insert has occurred. Returns null if the entity does not yet have an id. Parameters: entity

optional (Optional) Whether the association is optional. If set to false then a non- null relationship ... is not null . Default: true Since: Jakarta Persistence (JPA) 1.0 Additional JDK methods inherited from

EntityNotFoundException exception with null as its detail message. Since: Jakarta Persistence (JPA) 1 ... with null as its detail message. Since: Jakarta Persistence (JPA) 1.0 EntityNotFoundException ( String

() Can the attribute be null ? Returns: boolean indicating whether the attribute can be null . See Also: jakarta

may be null . This is a hint and is disregarded for primitive types; it may be used in schema generation to infer that the mapped column is not null . If not specified, defaults to true . Default: true

TransactionRequiredException exception with null as its detail message. Since: Jakarta Persistence (JPA ... exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0

() Constructs a new NonUniqueResultException exception with null as its detail message. Since: Jakarta ... NonUniqueResultException exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0

Methods String getName () Return the parameter name, or null if the parameter is not a named ... position, or null if the parameter is not a positional parameter. Returns: position of parameter. Since: Jakarta Persistence (JPA) 1.0

datasource, if any, or null . Since: Jakarta Persistence (JPA) 1.0 PersistenceConfiguration managedClass ... of a non-JTA javax.sql.DataSource . Returns: the configured non-JTA datasource, if any, or null

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.Order Nulls getNullPrecedence() Return the precedence of null values. Returns: the precedence of null values . Since: Jakarta Persistence (JPA) 3.2

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Expression nullLiteral (    Class resultClass ) Create an expression for a null literal with the given type. Parameters: resultClass - type of the null literal Returns: null expression literal. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Expression coalesce (    Expression x ,    Expression y ) Create an expression that returns null if all its arguments evaluate to null , and the value of the first non- null argument

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Expression coalesce (    Expression x ,    Y y ) Create an expression that returns null if all its arguments evaluate to null , and the value of the first non- null argument otherwise. Parameters: x

Jakarta Persistence (JPA) Method in jakarta.persistence.metamodel.SingularAttribute boolean isOptional() Can the attribute be null ? Returns: boolean indicating whether the attribute can be null . See Also: jakarta.persistence.Basic.optional Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.Join Attribute getAttribute() Return the metamodel attribute representing the join target, if any, or null if the target of the join is an entity type. Returns: metamodel attribute or null . Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.ManyToOne boolean optional (Optional) Whether the association is optional. If set to false then a non- null relationship must always exist. May be used in schema generation to infer that the mapped foreign key column is not null . Default: true Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Predicate isNull (    Expression x ) Create a predicate to test whether the expression is null . Parameters: x - expression Returns: is- null predicate. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.CriteriaBuilder Predicate isNotNull (    Expression x ) Create a predicate to test whether the expression is not null . Parameters: x - expression Returns: is-not- null predicate. Since: Jakarta Persistence (JPA) 1.0

: the found entity instance or null if the entity does not exist. Throws: IllegalArgumentException ... for that entity's primary key or is null . Since: Jakarta Persistence (JPA) 1.0

: the found entity instance or null if the entity does not exist. Throws: PessimisticLockException ... unit, or if the second argument is not a valid non- null instance of the entity primary key type

Jakarta Persistence (JPA) Method in jakarta.persistence.criteria.Expression Predicate isNull() Create a predicate to test whether the expression is null . Returns: predicate testing whether the expression is null . Since: Jakarta Persistence (JPA) 1.0

: the found entity instance or null if the entity does not exist. Throws: IllegalArgumentException ... for that entity's primary key or is null . Since: Jakarta Persistence (JPA) 2.0

Jakarta Persistence (JPA) Method in jakarta.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: Jakarta Persistence (JPA) 1.0

class lockMode - lock mode primaryKey - primary key Returns: the found entity instance or null ... the second argument is not a valid type for that entity's primary key or is null

Returns: the found entity instance or null if the entity does not exist. Throws ... for that entity's primary key or is null . PersistenceException - if an unsupported lock

: the found entity instance or null if the entity does not exist. Throws: PessimisticLockException ... unit, or if the second argument is not a valid non- null instance of the entity primary key type

Jakarta Persistence (JPA) Method in jakarta.persistence.Basic boolean optional (Optional) Specifies whether the value of the field or property may be null . This is a hint and is disregarded for primitive types; it may be used in schema generation to infer that the mapped column is not null

PessimisticLockException () Constructs a new PessimisticLockException exception with null as its detail message

= "EMP_PIC", columnDefinition = "BLOB NOT NULL ") protected byte[] pic; See Also: Basic

exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0 LockTimeoutException

with the entity manager factory (the "second level cache"). Returns: an instance of Cache , or null

timeout, in seconds. This is a hint. Parameters: timeout - the timeout, in seconds, or null to indicate

). Returns null if the EntityGraph is not a named EntityGraph . Since: Jakarta Persistence (JPA) 1.0

EntityExistsException () Constructs a new EntityExistsException exception with null as its detail message

. The annotated field must not be null , and must hold a distinct value for each value of the enum type

null , if no alias has been assigned. Inherited from TupleElement Returns: alias. Since: Jakarta

the entity or mapped superclass. Returns: supertype of identifiable type or null if no such supertype

. Inherited from IdentifiableType Returns: supertype of identifiable type or null if no such supertype

from IdentifiableType Returns: supertype of identifiable type or null if no such supertype

() Return the alias assigned to the tuple element or null , if no alias has been assigned. Returns: alias

. Since: Jakarta Persistence (JPA) 1.0 String getAlias () Return the alias assigned to the tuple element or null

the predicate that corresponds to the where clause restriction(s), or null if no restrictions

the predicate that corresponds to the where clause restriction(s), or null if no restrictions

to the where clause restriction(s), or null if no restrictions have been specified. Inherited from

; } Example 2: @Column(name = "DESC", columnDefinition = "CLOB NOT NULL ", table = "EMP_DETAIL") @Lob

with null as its detail message. Since: Jakarta Persistence (JPA) 1.0 QueryTimeoutException ( String

RollbackException exception with null as its detail message. Since: Jakarta Persistence (JPA) 1.0