Mapping TIMESTAMP column from PostgreSQL to LocalDate

Question

I have field in Entity:

@Column(name = "BILL_DATE")
private LocalDate billDate;

And my system work with oracle and posthresql. In posgresql this columt has type timestamp but in oracle - date. When I try start server with postgeSQL I get error:

wrong column type encountered in column [bill_date] in table [charges]; found [timestamp (Types#TIMESTAMP)], but expecting [date (Types#DATE)]

if I add annotation @Temporal(TemporalType.DATE) I get another error:

Caused by: org.hibernate.AnnotationException: @Temporal should only be set on a java.util.Date or java.util.Calendar property

But I do not want use java.util.Date and java.util.Calendar. How to solve this problem?

Answer 1

Both Date in Oracle and Timestamp in PostgreSQL store date and time. Indeed according to PostgreSQL Documentation you should map them either to LocalDateTime if the timestamp is w/o the timezone, or to OffsetDateTime if it's with the timezone.

Hibernate 5 should support Java8 Time API, anyway if you're using JPA, you could implement AttributeConverter

import javax.persistence.AttributeConverter;
import java.sql.Timestamp;
import java.time.LocalDate;

public class LocalDateConverter implements AttributeConverter < LocalDate, Timestamp > {

    @Override
    public Timestamp convertToDatabaseColumn(LocalDate attribute) {
        return attribute != null ? Timestamp.valueOf(attribute.atStartOfDay()) : null;
    }

    @Override
    public LocalDate convertToEntityAttribute(Timestamp dbData) {
        return dbData != null ? dbData.toLocalDateTime().toLocalDate() : null;
    }

}

Then you can use

@Convert(converter = LocalDateConverter.class)
@Column(name = "BILL_DATE")
private LocalDate billDate;