使用JPA中的LocalDateTime列类型在MariaDB中创建DATETIME

Question

I need create DATETIME column in MariaDB using LocalDateTime column type in JPA.

I created this entity:

@Column
private LocalDateTime created_at;

but when I depot the code the column in MariDB is updated to DATE . I need DATETIME .

I also tried this:

@Column
@Temporal(TemporalType.TIMESTAMP)
private LocalDateTime created_at;

But when I deploy the code I get error:

@Temporal should only be set on a java.util.Date or java.util.Calendar property

I use Java 10 and spring-boot-starter-parent

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.RELEASE</version>
        <relativePath />
    </parent>

Is there any solution to this problem? For example is there a way to set the column type into the entity as DATETIME without using @Temporal ?

Answer 1

If you want to store a LocalDateTime in a TIMESTAMP column, you need to implement the mapping to java.sql.Timestamp .

You need to implement the AttributeConverter interface.

@Converter(autoApply = true)
public class LocalDateTimeAttributeConverter implements AttributeConverter<LocalDateTime, Timestamp> {

    @Override
    public Timestamp convertToDatabaseColumn(LocalDateTime locDateTime) {
        return (locDateTime == null ? null : Timestamp.valueOf(locDateTime));
    }

    @Override
    public LocalDateTime convertToEntityAttribute(Timestamp sqlTimestamp) {
        return (sqlTimestamp == null ? null : sqlTimestamp.toLocalDateTime());
    }
}