 5 | Method javax.persistence.criteria.From MapJoin joinMap( String attributeName ) Create an inner join to the specified Map-valued attribute. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0 |
5 | Method javax.persistence.criteria.From SetJoin joinSet( String attributeName ) Create an inner join to the specified Set-valued attribute. Parameters: attributeName - name of the attribute for the target of the join Returns: the resulting join Throws: IllegalArgumentException - if attribute of the given name does not exist Since: JPA 2.0 |
5 | of the select item when it results from a get or join operation and the query result type is specified ... .createQuery(Product.class); q2.select(q2.from(Order.class) .join("items") . join("product |
5 | when it results from a get or join operation and the query result type is specified ... (Product.class);
q2.select(q2.from(Order.class)
.join("items")
.join("product")); Parameters: selection - selection specifying the item that is to be returned |
5 | COUNT($1) FROM com.lexware.vereinsverwaltung.verein.mitglied.Mitglied $1 LEFT JOIN $1.mitgliedschaft $2 LEFT JOIN $1.profile $3 LEFT JOIN $3.organisation $4 LEFT JOIN $1.postalAddresses $5 LEFT JOIN $1 ... .Mitglied $1 LEFT JOIN $1.mitgliedschaft $2 LEFT JOIN $1.profile $3 LEFT JOIN $3.organisation $4 LEFT |
4 | :
(v$1.linkedObjects join v$2).
Step 5: Process ObjectProperty (v$3) instances ... .properties join v$3).
[Step 5b]
Evaluate fields in ObjectProperty (v$3) instances.
[Step 5c ... is preferred and can improve performance). Complex heavy queries with several JOIN operations require |
4 | Annotation Element javax.persistence.AssociationOverride JoinColumn[] joinColumns The join column(s) being mapped to the persistent attribute(s). The joinColumns elements must be specified ... must not be specified if a join table is used in the overriding of the mapping of the relationship. Default value: {} Since: JPA 1.0 |
4 | Annotation Element javax.persistence.AssociationOverride JoinTable joinTable The join table that maps the relationship. The joinTable element must be specified if a join table is used in the overriding of the mapping of the relationship. The joinTable element must not be specified if a foreign key |
4 | Annotation Element javax.jdo.annotations.Element String serialized Whether the element is to be stored serialized (into a join table) Returns: whether the element is to be stored serialized (into a join table) Default value: "" Since: JDO 2.1 |
4 | Method javax.persistence.criteria.Fetch Attribute getAttribute() Return the metamodel attribute corresponding to the fetch join. Returns: metamodel attribute for the join Since: JPA 2.0 |