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  • How to describe a link by programming?
  • List of HFSQL properties used to describe a link by programming
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Stored procedures
HDescribeLink (Function)
In french: HDécritLiaison
ODBCNot available with this kind of connection
Describes a link between two data files by programming.
After the call to HDescribeLink:
  • The description of the link is validated.
  • The link description cannot be modified anymore.
  • The variable for link description is reinitialized. A new link description can be done.
Remark: From version 19, HFSQL is the new name of HyperFileSQL.
Example
HDescribeLink(CustomerProductLink)
Syntax
<Result> = HDescribeLink(<Link>)
<Result>: Boolean
  • True if the operation was performed,
  • False if a problem occurred. HErrorInfo is used to identify the error.
<Link>: Variable of type Link Description
Name of the variable of type Link description corresponding to the link to be created.
Remarks

How to describe a link by programming?

To describe a link by programming, you must:
  1. Use the Link description variables.
  2. Describe the characteristics of the link via the HFSQL properties.
  3. Use HDescribeLink to save the description of the link.
Remark: To describe a data file by programming, use HDescribeFile. To describe items by programming, use HDescribeItem.

List of HFSQL properties used to describe a link by programming

The following properties are available in read/write.
DeletionRule..DeletionRule is used to configure the deletion rule (integrity management) of records that will be applied to the file described by programming.
LinkedFile..LinkedFile is used to configure the characteristics of a link.
LinkedKey..LinkedKey is used to configure the characteristics of a link.
MaxLinkedCardinality..MaxLinkedCardinality is used to find out and modify the maximum cardinality of the linked item in the link.
MaxSourceCardinality..MaxSourceCardinality is used to find out and modify the maximum cardinality of the source item in the link.
MinLinkedCardinality..MinLinkedCardinality is used to find out and modify the minimum cardinality of the linked item in the link.
MinSourceCardinality..MinSourceCardinality is used to find out and modify the minimum cardinality of the source item in the link.
ModificationRule..ModificationRule is used to configure the modification rule of records (integrity management) that will be applied to the file described by programming.
Name..Name is used to find out:
  • the name of the font associated with a Font variable.
  • the name of a control, report or report block.
  • the name of a control, group of controls or window.
  • the name of a control, group of controls or page.
SourceFile..SourceFile is used to configure the characteristics of a link.
SourceKey..SourceKey is used to configure the characteristics of a link.
Component : wd250hf.dll
See also
Minimum version required
  • Version 9
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