Documentation:Embed: Difference between revisions

Embed

Revision as of 06:34, 13 March 2023

Embed (e) at an association end is best explained as "in which table is the foreign key placed". This is often self-evident:

One-to-Many - foreign key will go in many ends.
Many-to-Many - foreign key will go into link-class(possibly implicit)
One-to-One - This is where Embed-flag becomes important because it is optional where to put the foreign key.

If you do not know what end to pick - you can just pick any of them. However, as you grow more experienced, you might want to have the ability to control this.

If you set Embed=false on the many-end, you prevent the framework from doing the reasonable thing - the framework will then assume you have a good reason and create an implicit association class where it can put the keys.

This page was edited more than 11 months ago on 02/10/2024. What links here

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-Embed (e) at an association end is best explained as "in which table is the foreign key placed" This is often self-evident:
+Embed (e) at an association end is best explained as "in which table is the foreign key placed". This is often self-evident:
+* One-to-Many - foreign key will go in many ends.
+* Many-to-Many - foreign key will go into link-class(possibly implicit)
+* One-to-One - This is where Embed-flag becomes important because it is optional where to put the foreign key.
+If you do not know what end to pick - you can just pick any of them. However, as you grow more experienced, you might want to have the ability to control this.
-One-to-Many - foreign key will go in many end.
+If you set Embed=false on the many-end, you prevent the framework from doing the reasonable thing - the framework will then assume you have a good reason and create an implicit association class where it can put the keys.
-Many-to-Many - foreign key will go into link-class(possibly implicit)
-One-to-One - This is where Embed-flag becomes important, because it is optional where to put the foreign key.
-If you do not know what end to pick - you can just pick any of them. But as you grow more experienced you might want to have the ability to control this.
-If you set Embed=false on the many-end you prevent the framework from doing the reasonable thing - the framework will then assume you have a good reason and create an implicit association class where it can but the keys.
 [[Category:Associations]]