Package jakarta.persistence
Interface AttributeConverter<X,Y>
- Type Parameters:
X
- the type of the entity attributeY
- the type of the database column
public interface AttributeConverter<X,Y>
A class that implements this interface can be used to convert
entity attribute state into database column representation
and back again.
Note that the X and Y types may be the same Java type.
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Method Summary
Modifier and TypeMethodDescriptionconvertToDatabaseColumn
(X attribute) Converts the value stored in the entity attribute into the data representation to be stored in the database.convertToEntityAttribute
(Y dbData) Converts the data stored in the database column into the value to be stored in the entity attribute.
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Method Details
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convertToDatabaseColumn
Converts the value stored in the entity attribute into the data representation to be stored in the database.- Parameters:
attribute
- the entity attribute value to be converted- Returns:
- the converted data to be stored in the database column
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convertToEntityAttribute
Converts the data stored in the database column into the value to be stored in the entity attribute. Note that it is the responsibility of the converter writer to specify the correctdbData
type for the corresponding column for use by the JDBC driver: i.e., persistence providers are not expected to do such type conversion.- Parameters:
dbData
- the data from the database column to be converted- Returns:
- the converted value to be stored in the entity attribute
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