What is the use of the Temporal annotation in Hibernate

Question

The Hibernate Documentation has the information below for the  Temporal annotation      In plain Java APIs  the temporal precision of time is not defined    When dealing with temporal data you might want to describe the   expected precision in database  Temporal data can have DATE  TIME  or   TIMESTAMP precision  ie the actual date  only the time  or both   Use   the  Temporal annotation to fine tune that    What does temporal precision of time is not defined mean  What is temporal data and its precision  How does it fine tune

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I use Hibernate 5 2 and  Temporal is not required anymore  java util date  sql date  time LocalDate are stored into DB with appropriate datatype as Date timestamp

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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   The Temporal annotation may be used in conjunction with the Basic annotation  the Id annotation  or the ElementCollection annotation  when the element collection value is of such a temporal type    In plain Java APIs  the temporal precision of time is not defined  When dealing with temporal data  you might want to describe the expected precision in database  Temporal data can have DATE  TIME  or TIMESTAMP precision  i e   the actual date  only the time  or both   Use the  Temporal annotation to fine tune that   The temporal data is the data related to time  For example  in a content management system  the creation-date and last-updated date of an article are temporal data  In some cases  temporal data needs precision and you want to store precise date time or both  TIMESTAMP  in database table   The temporal  precision is not specified in core Java APIs   Temporal is a JPA annotation that converts back and forth between timestamp and java util Date  It also converts time-stamp into time  For example  in the snippet below   Temporal TemporalType DATE  drops the time value and only preserves the date    Temporal TemporalType DATE  private java util Date creationDate    As per javadocs      Annotation to declare an appropriate   code TemporalType  on query   method parameters  Note that this annotation can only be used on   parameters of type   link Date  with default TemporalType DATE    Information above collected from various sources

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Temporal types are the set of time-based types that can be used in persistent state mappings    The list of supported temporal types includes the three java sql types java sql Date  java sql Time  and java sql Timestamp  and it includes the two java util types java util Date and java util Calendar   The java sql types are completely hassle-free  They act just like any other simple mapping type and do not need any special consideration    The two java util types need additional metadata  however  to indicate which of the JDBC java sql types to use when communicating with the JDBC driver  This is done by annotating them with the  Temporal annotation and specifying the JDBC type as a value of the TemporalType enumerated type    There are three enumerated values of DATE  TIME  and TIMESTAMP to represent each of the java sql types

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use this      Temporal TemporalType TIMESTAMP   Column name  create date   private Calendar createDate   public Calendar getCreateDate         return createDate     public void setCreateDate Calendar createDate        this createDate   createDate

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If you re looking for short answer   In the case of using java util Date  Java doesn t really know how to directly relate to SQL types  This is when  Temporal comes into play  It s used to specify the desired SQL type   Source  Baeldung

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Temporal is a JPA annotation which can be used to store in the database table on of the following column items     DATE  java sql Date  TIME  java sql Time  TIMESTAMP  java sql Timestamp    Generally when we declare a Date field in the class and try to store it  It will store as TIMESTAMP in the database    Temporal private Date joinedDate    Above code will store value looks like 08-07-17 04 33 35 870000000 PM    If we want to store only the DATE in the database  We can use define TemporalType    Temporal TemporalType DATE  private Date joinedDate    This time  it would store 08-07-17 in database  There are some other attributes as well as  Temporal which can be used based on the requirement

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We use  Temporal annotation to insert date  time or both in database table Using TemporalType we can insert data  time or both int table   Temporal TemporalType DATE     insert date  Temporal TemporalType TIME     insert time  Temporal TemporalType TIMESTAMP     insert  both time and date

[java] What is the use of the @Temporal annotation in Hibernate?

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