由：org.hibernate.MappingException引起：未知实体：新对象。JTA

Question

@Entity
public class Unidade implements Serializable{

    private static final long serialVersionUID = 1L;


    private Long numeroUnidade;
    private String nomeUnidade;
    private Integer numeroCep;
    private Integer numeroCepComplemento;
    private String tipoServico;
    private Integer status;
    private String logradouro;
    private String bairro;
    private String cidade;
    private String uf;
    private Integer statusVinculo; 

   //getter and setters

@PersistenceContext(unitName="projetoAtividade")
private EntityManager em;

public void selectTeste(){
        int quantidade = (Integer) em.createNativeQuery("select count(*) from abc.nattbu29_escritorio;").getSingleResult();
        System.out.println("========== QUANTIDADE DE REGISTRO NA TABELA ===========");
        System.out.println(quantidade);
    }

查询：

@SuppressWarnings("unchecked")
        public List<UnidadeTeste> buscarUnidadeGenerica(int numeroCeps, int numeroComplementoCeps){
            List<UnidadeTeste> lsita = new ArrayList<UnidadeTeste>();
            String query = "SELECT "
                    +"TBZ21.NATURAL as numeroPv, "
                    +"TBZ21.UNIDADE as nomePv, "
                    +"TBZ21.SITUACAO as statusVinculacao, "
                    +"TBJ55.TPO_ATUACAO_U44 as tipoServAZW, "
                    +"TBJ55.SITUACAO_ATUAL as status, "
                    +"TBH18.LOCALIDADE as cidade, "
                    +"'' as bairro, "
                    +"'' as logradouro, "
                    +"TBH18.CEP as numeroCep, "
                    +"TBH18.CEP_COMPLEMENTO as numeroCepComplemento, "
                    +"TBH18.FK_AZWVWL22_UNISG as uf "
                    +"FROM AZW.AZWTBJ55_RGATUACAO TBJ55 "
                    +"LEFT JOIN AZW.AZWTBH18_LOCALIDADE TBH18 ON "
                    +"TBH18.LOCALIDADEE = TBJ55.LOCALIDADEE "
                    +"LEFT JOIN AZW.AZWTBZ21_UNIDADE TBZ21 ON "
                    +"TBJ55.NATURAL = TBZ21.NATURAL "
                    +"WHERE TBH18.CEP = ?1 "
                        +"AND TBH18.CEP_COMPLEMENTO = ?2; "

            lsita = em.createNativeQuery(query, Unidade.class)
                    .setParameter(1, numeroCeps)
                    .setParameter(2, numeroComplementoCeps)
                    .getResultList();
            System.out.println(lsita.size()+"<<<<=====================");
            return lsita;
        }

错误：

Caused by: org.hibernate.MappingException: Unknown entity: br.com.project.modelo.UnidadeTeste
    at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1031) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.getSQLLoadable(SQLQueryReturnProcessor.java:336) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.processRootReturn(SQLQueryReturnProcessor.java:377) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.processReturn(SQLQueryReturnProcessor.java:356) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.loader.custom.sql.SQLQueryReturnProcessor.process(SQLQueryReturnProcessor.java:172) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.loader.custom.sql.SQLCustomQuery.<init>(SQLCustomQuery.java:87) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.engine.query.spi.NativeSQLQueryPlan.<init>(NativeSQLQueryPlan.java:67) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.engine.query.spi.QueryPlanCache.getNativeSQLQueryPlan(QueryPlanCache.java:155) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.internal.AbstractSessionImpl.getNativeSQLQueryPlan(AbstractSessionImpl.java:218) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.internal.AbstractSessionImpl.list(AbstractSessionImpl.java:224) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.internal.SQLQueryImpl.list(SQLQueryImpl.java:156) [hibernate-core-4.0.1.Final.jar:4.0.1.Final]
    at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:252) [hibernate-entitymanager-4.0.1.Final.jar:4.0.1.Final]
    ... 84 more

在我的网上搜索中，几乎所有论坛主题的答案都是一致的：“把@实体放在类声明之前”，但是，这对我来说不起作用。

 ERROR [org.jboss.ejb3.invocation] (http--127.0.0.1-8888-2) JBAS014134: EJB Invocation failed on component AtividadeEJB for method public void br.com.project.jboss.modelo.AtividadeEJB.testeChamada(): javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.MappingException: Unknown SqlResultSetMapping [UnidadeResult]
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:166) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:230) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:304) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
    at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:190) [jboss-as-ejb3-7.1.1.Final.jar:7.1.1.Final]
    at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:1.1.1.Final]

@Entity
@SqlResultSetMapping(name="UnidadeResult", 
entities={ 
    @EntityResult(entityClass=UnidadeTeste.class, fields={
        @FieldResult(name="tx_descricao", column="nomePv"),
        @FieldResult(name="nu_idntr_pessoa", column="id")})},
columns={
    @ColumnResult(name="nomePv")}
)


public class UnidadeTeste implements Serializable{

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue
    private Long id;

    private String nomePv;

    public String getNomePv() {
        return nomePv;
    }

    public void setNomePv(String nomePv) {
        this.nomePv = nomePv;
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

@SuppressWarnings("unchecked")
    public void testeChamada(){
        List<Object> lista = em.createNativeQuery("SELECT nu_idntr_pessoa as id, email as nomePv FROM pessoa;", "UnidadeResult").getResultList();
        System.out.println("===============>>"+lista.size());
    }

Answer 1

如果要将本机查询的结果返回给对象，我建议使用SQLResultSetMapping。

否则，将返回类型设置为：

List<Object[]> results = em.createNativeQuery(query)
                .setParameter(1, numeroCeps)
                .setParameter(2, numeroComplementoCeps)
                .getResultList();

然后循环遍历结果列表，并将对象数组的每个成员强制转换为其数据类型。