@Entity - Use to mark any class as Entity.
@Table - Use to change table details.
@Id - use to mark column in id(primary key).
@GeneratedValue - hibernate will automatically generate value for using internal sequence.
@column - can be used to specify column mapping. for example, to change the column name in the associated table in the database.
@Trensient - this tells hibernate not to save this field.
@Temporal - @Temporal over a date field tells hibernate the format in which data need to be saved.
@Lob - @Lob tells hibernate that this is a large object, not a simple object.
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