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Priyanka Dhingra
Service Builder: foriegn key, not null constraint
November 8, 2012 5:22 AM
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Priyanka Dhingra

Rank: Liferay Master

Posts: 501

Join Date: December 19, 2011

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I have a requirement to create entities with columns that have
1.foreign key references and
2.some columns that have NOT NULL constraints

Please suggest something
Thanks and Regards
Priyanka Dhingra
David H Nebinger
RE: Service Builder: foriegn key, not null constraint
November 8, 2012 5:48 AM
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David H Nebinger

Rank: Liferay Legend

Posts: 7237

Join Date: September 1, 2006

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So create the table manually in your database. Liferay will not define the FK relationships for you, so that must be a manual step.

For the not null thing, you have a couple of choices...

Easiest one is the definition of the column for the entity. If the column type is a primitive, you'll never have a null value so you don't have to worry about nulls (instead they would be zeros).

For the FK verification side, you can either do lookup and fk validation check within the XxxLocalServiceImpl class (overriding the addXxx and updateXxx methods), or you could leave them as-is and implement a solution using a model listener (in the onBefore methods, ensure the column has a valid FK value, throw an exception if it does not).
Priyanka Dhingra
RE: Service Builder: foriegn key, not null constraint
November 8, 2012 9:37 PM
Answer

Priyanka Dhingra

Rank: Liferay Master

Posts: 501

Join Date: December 19, 2011

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Thanks for the solution David. I'll follow it...
I am new to Database emoticon
theres some dilemma related to this that what is the following code representing...is it something related to foriegn key reference
1<column name="tterminal_id" type="Collection" mapping-key="tswitch_id"
2            entity="tswitch" />
Subhash Pavuskar
RE: Service Builder: foriegn key, not null constraint
November 8, 2012 9:50 PM
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Subhash Pavuskar

Rank: Regular Member

Posts: 234

Join Date: March 12, 2012

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@Priyanka :
Hope this Blog may help you to understand !! Click Here
Priyanka Dhingra
RE: Service Builder: foriegn key, not null constraint
November 8, 2012 9:59 PM
Answer

Priyanka Dhingra

Rank: Liferay Master

Posts: 501

Join Date: December 19, 2011

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So does that mean-"Liferay defines the FK relationships for us"??????????????
Subhash Pavuskar
RE: Service Builder: foriegn key, not null constraint
November 8, 2012 10:30 PM
Answer

Subhash Pavuskar

Rank: Regular Member

Posts: 234

Join Date: March 12, 2012

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If you check the database, there really isn't any FK created. service.xml just defines specifies "relationships". If you studied service modelling in service oriented architecture, this is how it is suppose to be to make service autonomous.