KeyType (Property)

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HFSQL properties

KeyType (Property)

In french: TypeClé

Available only with these kinds of connection

The Property TypeKey allows to set the characteristics of a key Item. You can:

Find out whether an item is key for an item defined in the data model editor or by programming.
Define a key item (when the item is described by programming).

Versions 17 and later

This property is now available for iPhone/iPad applications.

New in version 17

This property is now available for iPhone/iPad applications.

Versions 18 and later

This property is now available in Windows Store Apps mode.

New in version 18

This property is now available in Windows Store Apps mode.

Versions 21 and later

This property is now available in Universal Windows 10 App mode.

New in version 21

This property is now available in Universal Windows 10 App mode.

Example

// Define the characteristics of the Orders.OrdID key
IDCorder.of.the.KeyType.command.= hUniqueKey
...
// Validate the data file description
HDescribeFile(Orders)

Syntax

Finding out whether an item is key Hide the details

<Characteristic>: Integer constant

The characteristics of an item are:
hDuplicatesKey Key with duplicates. This item can have the same value for several data file records.
hUniqueKey Unique 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.
hNotAKey The item is not a key.

<Data file>: Character string (with or without quotes)

Name of data file used. This name was defined in the data model editor or by the File description type.

<Item>: Character string (with or without quotes)

Name of item used. This name was defined in the data model editor or by the Item description type.

Defining a key by programming Hide the details

<Item>.KeyType = <Type of key>

<Item>: Character string (with or without quotes)

Name of item used. This name was defined by the Item description type.

<Type of key>: Integer constant

The characteristics of a key can be:
hDuplicatesKey Key with duplicates. This item can have the same value for several data file records.
hUniqueKey Unique 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.
hNotAKey The item is not a key.