使用 Spring JPA 查询从序列中获取 nextval

Question

我有一个存储库，我正在尝试从序列中获取下一个值。我需要参数化的序列名称。存储库查询类似于：@Query(value = "SELECT ?1.NEXTVAL from dual;", nativeQuery = true) String getSeqID(@Param("seqName") String seqName);但是，我得到以下异常：org.hibernate.QueryException: JPA-style positional param was not an integral ordinal    at org.hibernate.engine.query.spi.ParameterParser.parse(ParameterParser.java:187) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]    at org.hibernate.engine.query.spi.ParamLocationRecognizer.parseLocations(ParamLocationRecognizer.java:59) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]    at org.hibernate.engine.query.internal.NativeQueryInterpreterStandardImpl.getParameterMetadata(NativeQueryInterpreterStandardImpl.java:34) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]    at org.hibernate.engine.query.spi.QueryPlanCache.getSQLParameterMetadata(QueryPlanCache.java:125) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]

Answer 1

package br.com.mypackage.projectname.repository;

import java.math.BigDecimal;

import org.springframework.data.jpa.repository.JpaRepository;

import org.springframework.data.jpa.repository.Query;

import org.springframework.stereotype.Repository;

@Repository

public interface MyRepository extends JpaRepository<Myentity, Long> {

    @Query(value = "SELECT SCHEMA.SEQUENCE_NAME.nextval FROM dual", nativeQuery = true)

    public BigDecimal getNextValMySequence();

}

Answer 2

在 PostgreSQL 中是：

Long value = Long.parseLong(entityManager
            .createNativeQuery("select nextval('sequence_name')")
            .getSingleResult().toString());

Answer 3

@Entity

@Table(name = "tabelName")

public class yourEntity{

    @Id

    @SequenceGenerator(name = "yourName", sequenceName = "yourSeqName", allocationSize = 1)

    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "yourName")

    @Column(name = "id", updatable = false)

    protected Long id;

}

@Query(value = "SELECT yourSeqName.nextval FROM tableName", nativeQuery = true)

Long getNextSeriesId();

编辑：

Query q = em.createNativeQuery("SELECT yourSeqName.NEXTVAL FROM DUAL");

return (java.math.BigDecimal)q.getSingleResult();

Answer 4

您可以使用EntityManager：

entityManager.createNativeQuery("select seqname.nextval ...").getSingleResult();