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This is a simple metadata property to indicate that a column is a foreign key to another table in the same database. One can set the Foreign Type property to the target table. This provides metadata so developers will know that a column is used as a foreign key. Servoy will use this information when new relations are created between the tables and auto-fill the keys. This property is also used by the mergeRecords method of the databaseManager API to update any affected related records, such that they'll reference a new key. 

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Servoy supports the use of Universally Unique Identifiers (UUID). A UUID is a 16-byte number which can be (practically) guaranteed to be unique across computing environments, making it ideal to use for sequences in scenarios where traditional numeric sequences are not adequate, for example when syncing data which is generated offline. It is generally not feasible to store UUIDs as numeric data types because the number is so large. Rather UUIDs are most easily stored as 36-character strings. When using a text column to store UUIDs, one should mark the column's UUID flag. Thus, Servoy will provide programmatic access to this column in the form of a built-in UUID data type, which allows both string and byte representation.

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The UID parameter that was supplied at the time of login, entered at the time of record creation.

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The UID parameter that was supplied at the time of [login|https://wiki.servoy.com:8443/display/DOCS/Security#Security-login|Link to login method in reference guide], reentered each time the record is modified.

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A value list can be bound to a global method which supplies the values every time the value lists is used. This option gives the developer the most control, but also requires that the developer write code, and is therefore recommended to be used when the other value list types are not sufficient. The method is invoked often, each time the value list is referenced and each time the context changes.

Parameters

String displayValue - The value entered by the user into the field bound to the value list. This value will be null, unless the user is typing into the field, in which case the method may be called often as the user types. This parameter is useful when used in combination with Type Ahead fields, allowing the developer to filter the values as the user types.

Object realValue - The real value that is stored in a data provider that is bound to the field for which the value list is invoked. This value is passed in to allow developers to provide display values for a given real value which may not already be in the list.

JSRecord record - The record which is the context for the value list.

String valueListName - The name of the value list for which values will be supplied as multiple value lists could use the same method to obtain their values.

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