HExecuteView (Function)

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Selection condition

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HExecuteView (Function)

In french: HExécuteVue

Not available with this kind of connection

Warning
From version 20, SQL views and the materialized views are available.
The views handled by this function correspond to the former view mechanism. They do not correspond to SQL views or to materialized views.

Runs a view that was created beforehand (can be used to refresh the view data for example). If the view was created by HCreateView with the hViewPostponed constant, HExecuteView must be used to run the view.

Reminder: a view corresponds to the image of a data file at a given time. A view is stored in memory, which insulates it from the modifications performed in the associated data file. A view can be handled like a standard HFSQL data file.

Versions 17 and later

This function is now available for iPhone/iPad applications.

New in version 17

This function is now available for iPhone/iPad applications.

Versions 18 and later

This function is now available in Windows Store apps mode.

New in version 18

This function is now available in Windows Store apps mode.

Versions 21 and later

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

New in version 21

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

Remark: From version 19, HFSQL is the new name of HyperFileSQL.

Example

See additional examples

// Runs the Customer34 view
HExecuteView(Customer34)

Syntax

<Result> = HExecuteView(<View> [, <Selection condition>])

<Result>: Boolean

True if the view was run,
False otherwise. HError returns more details about the problem.

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

Name of view to run. This name was defined by HCreateView.

<Selection condition>: Optional character string

New selection condition for the view records (<Selection Condition> replaces the condition specified when creating the view). This selection condition can be an Ansi or Unicode character string.
Empty string ("") to avoid modifying the selection condition.

Remarks

Selection condition

The general syntax of a condition has the following format:

"CustName>'Smith' and ZipCode=34 or ZipCode=32"

The supported operators depend on the type of items used in the condition:


<>	Different	Valid for all types
>	Greater than	Valid for all types
>=	Greater than or equal to	Valid for all types
<	Less than	Valid for all types
<=	Less than or equal to	Valid for all types
=	Strictly equal to	Valid for all types
~=	Almost equal to	Valid for string types only
]	Contains	Valid for string types only
]=	Starts with	Valid for string types only

Notes about the selection condition:

Constant strings must be enclosed in single quotes.
If an item name is used in the selection condition, it must only contain letters, numbers and underscore characters ("_"). If the item name contains other characters (apostrophe, etc.), the name of the item must be enclosed in double quotes.
For example: "e_mail@"]'com'
Comparisons between strings are performed according to the ASCII value of the characters and not according to the lexicographic value ('a' > 'Z').
The binary memos, the composite keys and the subscripted items cannot be part of a selection condition.
If an <string constant> contains a single quote (or double quote), this single quote (or double quote) must be preceded by an anti-slash ( \).
All the items of the main data file can be included in the condition (even the ones that are not items of the view).
The condition is applied to each virtual record before it is included in the view. Therefore, you cannot specify several mutually excluding conditions for the same record (join). For example:
- "Date='1997' and Date='1996'" returns no result.
- "Date>='1996' and Date<='1997'" returns all the records found between 1996 and 1997.
This selection condition can be an Ansi or Unicode character string.

Component : wd260hf.dll