Netbean 6.9从此sql Server 2008表生成以下JPA实体类：
我想获得具有特定SKU值的所有ProductDescriptors.像这样的东西：
SELECT * FROM ProductDescriptors WHERE SKU='something'
给定实体类,获得结果的Java代码是什么？
谢谢.
@Entity
@Table(name = "ProductDescriptors")
@NamedQueries({
@NamedQuery(name = "ProductDescriptors.findAll",query = "SELECT p FROM ProductDescriptors p"),@NamedQuery(name = "ProductDescriptors.findByDescriptorID",query = "SELECT p FROM ProductDescriptors p WHERE p.descriptorID = :descriptorID"),@NamedQuery(name = "ProductDescriptors.findByLanguageCode",query = "SELECT p FROM ProductDescriptors p WHERE p.languageCode = :languageCode"),@NamedQuery(name = "ProductDescriptors.findByTitle",query = "SELECT p FROM ProductDescriptors p WHERE p.title = :title"),@NamedQuery(name = "ProductDescriptors.findByIsDefault",query = "SELECT p FROM ProductDescriptors p WHERE p.isDefault = :isDefault"),@NamedQuery(name = "ProductDescriptors.findByBody",query = "SELECT p FROM ProductDescriptors p WHERE p.body = :body")})
public class ProductDescriptors implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Basic(optional = false)
@Column(name = "DescriptorID")
private Integer descriptorID;
@Basic(optional = false)
@Column(name = "LanguageCode")
private String languageCode;
@Basic(optional = false)
@Column(name = "Title")
private String title;
@Basic(optional = false)
@Column(name = "IsDefault")
private boolean isDefault;
@Basic(optional = false)
@Column(name = "Body")
private String body;
@JoinColumn(name = "SKU",referencedColumnName = "SKU")
@ManyToOne(optional = false)
private Products products;
…
解决方法
像这样的东西：
@PersistenceContext( unitName = "youPersistenceUnitHere" )
private EntityManager _entityManager;
public List<ProductDescriptors> getProductDescriptorsBySku( String sku ) {
Query query = _entityManager.createquery( "Select ProductDescriptors from ProductDescriptors pd where pd.products.sku = ?1" );
query.setParameter( 1,sku );
return new ArrayList<ProductDescriptors>( query.getResultList() );
}