Hibernate を使用してデータベース スキーマに対して一連の JPA エンティティを検証すると、次のエラーが発生します。
Caused by: org.hibernate.HibernateException: Wrong column type in public.postal_code for column country. Found: bpchar, expected: bytea
at org.hibernate.mapping.Table.validateColumns(Table.java:282)
at org.hibernate.cfg.Configuration.validateSchema(Configuration.java:1268)
at org.hibernate.tool.hbm2ddl.SchemaValidator.validate(SchemaValidator.java:155)
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:460)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1737)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:84)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904)
... 9 more
基礎となるデータベースは PostgreSQL 9.1 であり、関連するデータベース テーブルは次のように定義されます。
CREATE TABLE country
(
code_alpha2 character(2) NOT NULL, -- ISO 3166 alpha2 code
code_alpha3 character(3), -- ISO 3166 alpha3 code
CONSTRAINT country_pkey PRIMARY KEY (code_alpha2)
)
WITH (
OIDS=FALSE
);
CREATE TABLE postal_code
(
country character(2) NOT NULL, -- ISO 3166 alpha2 country-code
code character varying(12) NOT NULL, -- Postal code proper
CONSTRAINT postal_code_pk PRIMARY KEY (country, code),
CONSTRAINT country_fk FOREIGN KEY (country)
REFERENCES country (code_alpha2) MATCH SIMPLE
ON UPDATE NO ACTION ON DELETE NO ACTION
)
WITH (
OIDS=FALSE
);
エンティティは次のように定義されます。
@Entity
public class Country implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name="code_alpha2", columnDefinition="bpchar")
private String codeAlpha2;
@Column(name="code_alpha3", columnDefinition="bpchar")
private String codeAlpha3;
public Country() {
}
public String getCodeAlpha2() {
return this.codeAlpha2;
}
public void setCodeAlpha2(String codeAlpha2) {
this.codeAlpha2 = codeAlpha2;
}
public String getCodeAlpha3() {
return this.codeAlpha3;
}
public void setCodeAlpha3(String codeAlpha3) {
this.codeAlpha3 = codeAlpha3;
}
}
@Entity
@IdClass(PostalCodePK.class)
@Table(name="postal_code")
public class PostalCode implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@ManyToOne(fetch=FetchType.EAGER)
@JoinColumn(name="country")
private Country country;
@Id
private String code;
public PostalCode() {
}
public Country getCountry() {
return country;
}
public void setCountry(Country country) {
this.country = country;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
}
最後に、postal_code の主キーを定義するクラス:
@Embeddable
public class PostalCodePK implements Serializable {
//default serial version id, required for serializable classes.
private static final long serialVersionUID = 1L;
@Column(columnDefinition="bpchar")
private Country country;
private String code;
public PostalCodePK() {
}
public Country getCountry()
return this.country;
}
public void setCountry(Country country) {
this.country = country;
}
public String getCode() {
return this.code;
}
public void setCode(String code) {
this.code = code;
}
public boolean equals(Object other) {
if (this == other) {
return true;
}
if (!(other instanceof PostalCodePK)) {
return false;
}
PostalCodePK castOther = (PostalCodePK)other;
return
this.country.equals(castOther.country)
&& this.code.equals(castOther.code);
}
public int hashCode() {
final int prime = 31;
int hash = 17;
hash = hash * prime + this.country.hashCode();
hash = hash * prime + this.code.hashCode();
return hash;
}
}
Hibernate が列の国でバイトを期待しているのはなぜですか? また、バリデーターにスキーマをそのまま受け入れるよう説得するにはどうすればよいでしょうか?