Hi, I am trying to map a composite key from a different CDT to another one

aswinb608

A Score Level 2

over 8 years ago

Hi,
I am trying to map a composite key from a different CDT to another one using one unique key inside xsd. How do I do it? Two columns from one cdt form a composite pair and I have another foriegn key coming from that table which defines the relationship. I want to map this foriegn key to that parent table inside CDT. What all JPA annotations should I use to get this behavior. I tried my best looking up online and troubleshooting with various things like @EmbeddedId, @Embeddable,@XmlInverseReference(mappedBy="fk_key")....but none of them parsed through appian cdt parser. Any help would be deeply appreciated.

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0 PhilB
Certified Lead Developer
over 8 years ago

@aswinb608 You can't map a composite key in the way you are attempting to. I believe the @Id annotation can only be used with a single column of, for example, string or integer.

You could select one of the composite keys and map that as an @Id, but you could see odd behaviour, such as only getting a single row when that key is actually repeated several times. This can actually work, provided any query against that table always uses that key.

Your other alternatives (as mentioned above) are to have a view created that provides a unique identifier, or to use the query database smart service.
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0 PhilB
Certified Lead Developer
over 8 years ago

@aswinb608 You can't map a composite key in the way you are attempting to. I believe the @Id annotation can only be used with a single column of, for example, string or integer.

You could select one of the composite keys and map that as an @Id, but you could see odd behaviour, such as only getting a single row when that key is actually repeated several times. This can actually work, provided any query against that table always uses that key.

Your other alternatives (as mentioned above) are to have a view created that provides a unique identifier, or to use the query database smart service.
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