I have an entity with a Timestamp field corresponding to a DATE column in the Oracle database.
#Entity
public class Order {
private Tiemstamp purchaseDate;
//more fields...
}
When I insert a row, DATE format in the database is "dd/MM/yyyy hh:mm:ss", but I want it to be just "dd/MM/yyyy".
How can I define the format?
To ignore time in a Date attribute in Java and Hibernate, declare your attribute as java.util.Date and either use the annotation #Type(type="date") along with it or use the #Temporal(TemporalType.DATE) annotation with it.
Here's what you need:
#Column
#Type(type="date")
private Date purchaseDate;
#Column
#Temporal(TemporalType.DATE)
private Date purchaseDate;
Because Timestamp is designed to hold both date and time, whereas Date holds only the date.
Please refer to HIBERNATE DATE VS TIMESTAMP Article for further details.
Despite the Oracle data type is called Date, it always stores datetime.
The Oracle database does not have a data type that is unique to date without the time.
In Java, instead of using the Timestamp use java.sql.Date.
Do not worry about it, the Hibernete makes this treatment a safe and transparent manner.
Related
I am creating a spring boot project where I am storing date under my jpa entity class and using the #CreatedDate annotation I am storing ISO type date in postgres.Now I want to filter the date based on date_before and date_after both of them given in query params in the request.
How can I do it in postgres query?
My JPA class:
#Entity
public class Model{
String name;
#CreatedDate
Date date;
}
Now I get my request with both date_before and date_after fields which are both in ISO format.How do I write a query that does the filter operation for me?
I'm using Hibernate 5.3.13
I am querying for a date with a named query:
public Date getDate() {
return entityManager.createNamedQuery("MyEntity.myNamedQuery", Date.class)
//setting some parameters here
.getSingleResult();
}
Column definition:
#Column(name="date")
#Temporal(TemporalType.TIMESTAMP)
private Date date;
This query works fine but hibernate returns java.sql.Timestamp when I want java.util.Date.
Is it possible to make hibernate return Date instead of Timestamp?
Taken from Hibernate – Mapping Date and Time:
As we've seen, the java.util.Date type (milliseconds precision) is not precise enough to handle the Timestamp value (nanoseconds precision).
So when we retrieve the entity from the database, we'll unsurprisingly find a java.sql.Timestamp instance in this field, even if we initially persisted a java.util.Date:
[...]
This should be fine for our code since Timestamp extends Date.
You can just cast the returned value to Date.
Check out the reference in general, it has more details for you.
Spring boot 2 has made UTC format the default for dates when serializing objects as json. This broke several of our old integrations that relied on the date being a timestamp. How do I selectively restore this functionality to the responses that need it?
On any dates you need formatted as a timestamp again, in either the constructor or on the field annotate them with #JsonFormat(shape = JsonFormat.Shape.NUMBER) like so:
#JsonFormat(shape = JsonFormat.Shape.Number)
private Date myDate;
or
MyClass(#JsonFormat(shape = JsonFormat.Shape.Number)
Date myDate) {
...
}
I'm using Hibernate 5.0.0CR1 for it's ability to use the JDK8 time package, but I'm getting an exception at this code when I try to persist an entity. Can someone tell me what is happening, and how to fix it? I'm using the EntityManager API's.
Mapping:
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "Creation_Date", nullable = false)
private final ZonedDateTime creationDate;
Exception:
Caused by: org.hibernate.AnnotationException: #Temporal should only be set on a java.util.Date or java.util.Calendar property
You need to change the creationDate's type. The error is specific enough about what the Temporal annotation needs i.e. either a a java.util.Date or a java.util.Calendar property whereas ZonedDateTime implements neither. Do not confuse the java.time.temporal.Temporal interface which ZonedDateTime implements with the javax.persistence.Temporal annotation.
Use one of them and it will work.
The java docs on Temporal are clear enough about it as well:
This annotation must be specified for persistent fields or properties
of type java.util.Date and java.util.Calendar. It may only be
specified for fields or properties of these types.
I recommend using a date field over a calendar one because a calendar basically provides getter and setter for the date fields and it and it brings a slight overhead.
Only use Calendar when you actually need to perform date/time calculations, or to format dates for displaying them to the user.
Solution example:
#Temporal(TemporalType.TIMESTAMP)
#Column(name = "Creation_Date", nullable = false)
private Date creationDate;
I also faced similar issue while I was converting from Date to ZonedDateTime, you can apply annotation '#CreationTimestamp' instead of #Temporal(TemporalType.TIMESTAMP) and it will work;
#CreationTimestamp
#DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME)
private final ZonedDateTime creationDate;
You don't need to specify the #Temporal annotation with java.time.* classes. There is an explicit mapping:
Instant, ZonedDateTime, ... -> TIMESTAMP
LocalDate -> DATE
LocalTime, OffsetTime -> TIME
This is all explained here: https://www.baeldung.com/hibernate-date-time
I have an entity with a following column definition:
#Temporal(TemporalType.TIMESTAMP)
private Date dateStart;
#Temporal(TemporalType.TIMESTAMP)
private Date dateEnd;
In derby jpa automatically create TIMESTAMP columns. When I want to use the same application with Microsoft SQL Server, I have problem, because jpa automatically create column with TIMESTAMP type. In MSSQL only one TIMESTAMP column per table can exist and thus I have error in this situation. I can resolve the error by providing additional information about column definition:
#Temporal(TemporalType.TIMESTAMP)
#Column(columnDefinition = "DATETIME")
private Date dateStart;
#Temporal(TemporalType.TIMESTAMP)
#Column(columnDefinition = "DATETIME")
private Date dateEnd;
But this solution is not portable. Derby cannot create such datatype as DATETIME.
What is a best solution for portability in jpa and to achieve two (or more) columns with date+time values ?