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Stored procedures
KeyType (Property)
In french: TypeClé
HFSQLHFSQL Client/ServerAvailable only with these kinds of connection
The KeyType property is used to set the characteristics of a key item. You can:
  • Determine if an item is key for an item defined in the data model editor or through programming
  • Define a key item (when the item is described through programming).
Example
// Define the characteristics of the Orders.OrdID key
Orders.OrdID.KeyType = hUniqueKey
...
// Validate the data file description
HDescribeFile(Orders)
Syntax

Determining if an item is key Hide the details

<Characteristic> = <Data file>.<Item>.KeyType
<Characteristic>: Integer constant
The characteristics of an item are:
hDuplicatesKeyKey with duplicates. This item can have the same value for several data file records.
hNotAKeyThe item is not a key.
New in version 28
hPrimaryKey
Primary key. The value assigned to this item will not be null and will only be in the data file.
hUniqueKeyUnique key. The value assigned to this item will be unique in the data file. No file record will have the same value for this item.
<Data file>: Character string
Name of the data file used. This name was defined in the data model editor or with the File Description type.
<Item>: Character string
Name of the item used. This name was defined in the data model editor or with the Item Description type.
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Defining a key through programming Hide the details

<Item>.KeyType = <Type of key>
<Item>: Character string
Name of the item used. This name was defined by the Item Description type.
<Type of key>: Integer constant
The characteristics of a key can be:
hDuplicatesKeyKey with duplicates. This item can have the same value for several data file records.
hNotAKeyThe item is not a key.
New in version 28
hPrimaryKey
Primary key. The value assigned to this item will not be null and will only be in the data file.
hUniqueKeyUnique key. The value assigned to this item will be unique in the data file. No file record will have the same value for this item.
See also
Minimum version required
  • Version 9
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