Difference between revisions of "ExternalPrimaryKey"
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| − | If a [[MetaProxyProperty]] related to a [[MetaProxy]] is configured to be | + | If a [[MetaProxyProperty]] related to a [[MetaProxy]] is configured to be an '''ExternalPrimaryKey''' {{UBIK}} will handle this property of the corresponding [[Proxy]] object as an '''external key property'''. |
| − | + | Such properties provide the following features: | |
| − | + | * Proxy objects can be searched by their external key property; | |
| + | * Proxy objects can be linked to each other by using their external key properties and an external reference. | ||
| − | + | == External reference == | |
| − | + | An external reference is a link to a Proxy instance via a property value. If the MetaProxyProperty has a defined Reference it is defined as an External Reference. The Proxy will refer automatically to the instance of the targeted MetaProxy having the same entry in its external Primary Key Property than the given Proxy instance. | |
| − | == External | + | |
| − | An external | + | |
{{Hint|When using external keys and external references it does not matter which object is created first (master or child), the linkage will be done!}} | {{Hint|When using external keys and external references it does not matter which object is created first (master or child), the linkage will be done!}} | ||
Revision as of 10:43, 23 November 2015
If a MetaProxyProperty related to a MetaProxy is configured to be an ExternalPrimaryKey UBIK® will handle this property of the corresponding Proxy object as an external key property.
Such properties provide the following features:
- Proxy objects can be searched by their external key property;
- Proxy objects can be linked to each other by using their external key properties and an external reference.
External reference
An external reference is a link to a Proxy instance via a property value. If the MetaProxyProperty has a defined Reference it is defined as an External Reference. The Proxy will refer automatically to the instance of the targeted MetaProxy having the same entry in its external Primary Key Property than the given Proxy instance.
 | When using external keys and external references it does not matter which object is created first (master or child), the linkage will be done! |
 | Only one External Primary Key Property is supported for one MetaProxy object. Hence, the External Primary Key can consist of only one MetaProxyProperty. |
