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Relations join together two datasources, for example a CUSTOMERS and a ORDERS table.
Global relations
Global relations are relations that are not based on a datasource on the left side of the relation (Source side). Instead they contain relation items that are based on global variables and thus provide a filtering on the datasource on the right side of the relation (Destination side).
For example: a global relation can be used to get a JSFoundSet of all active records in a table.
Selfjoins
Relations can use the same table as primary and foreign table. Depending on the setup of the the RelationItems the relation can point back to the originating record or one or more different records.
Container relations
If the primary and foreign table are equal and the relation does not contain any RelationItems, it becomes a Container relation. A Container relation returns it originating FoundSet. A Container relation can be used to set the FoundSet of the parent form into the Form displayed in a TabPanel.
Relation options
When defining a relation, there are a several settings that influence the behavior of the Relation under different circumstances.
Allow creation of related records:
When true: the execution of "customers_to_orders.newRecord()" will create a new record.
When false: trying to create a new record over the relation will throw a ServoyException.NO_RELATED_CREATE_ACCESS exception.
Allow parent delete when having related records:
When true: when there are related order records, Servoy will block the delete of the customer record and raise a ServoyException.NO_PARENT_DELETE_WITH_RELATED_RECORDS exception.
When false: related records will not block the delete of the parent record
Delete related records:
When true: when the customer record is deleted and there are related records in the orders table, those order records will also get deleted.
When false: related records will remain untouched.
The option Allow parent delete when having related records overrules the option Delete related records, meaning that you set the first option to false, the value of the latter option will be ignored.
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Flag that tells if related records should be deleted or not when a parent record is deleted.
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Qualified name of the foreign data source.
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A String which specified a set of sort options for the initial sorting of data
retrieved through this relation.
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The join type that is performed between the primary table and the foreign table.
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The name of the relation.
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Qualified name of the primary data source.
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Unknown macro: {sub-section} Flag that tells if related records can be created through this relation.
The default value of this flag is "false".
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The default value of this flag is "true".
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The default value of this flag is "false".
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Unknown macro: {sub-section} Qualified name of the foreign data source. Contains both the name of the foreign
server and the name of the foreign table.
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Has the form "column_name asc, another_column_name desc, ...".
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Unknown macro: {sub-section} The join type that is performed between the primary table and the foreign table.
Can be "inner join" or "left outer join".
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