JPA column with incorrect underscore

问题:

I use JPA for database access and annotated every column with the correct name. Now if I execute a query (e.g. findAll()) it returns

Unknown column 'program0_.program_id' in 'field list'

The error message is correct program_id is unknown because the real name is programId.

Models: Program

  @Entity
  @Table(name = "programs")
  @XmlRootElement
  public class Program implements Serializable {
          @Id
          @GeneratedValue(strategy = GenerationType.IDENTITY)
          @Basic(optional = false)
          @Column(name = "programId")
          private Long programId;
          @ManyToMany
          @JoinTable(
                  name = "programlabels",
                  joinColumns = {
                    @JoinColumn(name = "program", referencedColumnName = "programId")},
                  inverseJoinColumns = {
                    @JoinColumn(name = "label", referencedColumnName = "labelId")})
          private Collection<Label> labels;
        }

Label

@Entity
@Table(name = "labels")
@XmlRootElement
public class Label implements Serializable {
  @Id
  @Basic(optional = false)
  @NotNull
  @Size(min = 1, max = 100)
  @Column(name = "labelId")
  private String labelId;  
}

Query

select program0_.program_id as program_1_5_, ...

Is there a reason why JPA changes "programId" to "program_id" or am I missing any configuration?

thanks

Edit: Oh sorry forgot to add query code/information.

I use the Spring Data's JpaRepository interface and tried the findAll() query.

@Repository
public interface ProgramRepository extends JpaRepository<Program, Long> {}

回答1:

As described in spring-boot-jpa-column-name-annotation-ignored, your column name is being converted to snake case.

Possible solutions:

• Setup a Naming Strategy
• Use lowercase column names in your annotations

回答2:

http://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html

spring.jpa.hibernate.naming.strategy is not a supported property for Spring JPA implementation using Hibernate 5.

Use the below property in application.properties

spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

回答3:

Were able to map

@Column(name = "PersonFullName")

private String PersonFullName;

---

to the database table column name "PersonFullName" without the underscore.

The below worked for me. Add this in the application settings and then use @Column to specify the physical database column name for the model's property.

@Column(name = "PersonFullName")

In Application.properties

spring.jpa.hibernate.naming.implicit-strategy=org.hibernate.boot.model.naming.ImplicitNamingStrategyLegacyJpaImpl spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl