Düzenle

Aracılığıyla paylaş

Filtering Items Using a Boolean Comparison

  • Makale

Boolean values are specified differently in a filter in Microsoft Jet syntax than in a filter in DAV Searching and Locating (DASL) syntax.

Jet Queries

In Jet syntax, boolean operators such as True/False, Yes/No, On/Off, and so on, should be used as is and should not be converted to a string. For example, to create a filter to return unread items, you can use this filter:

criteria = "[UnRead] = True"

Note If you convert the boolean value to a comparison string by enclosing it in quotation marks, then a Jet filter using any non-empty comparison string and filtering on a boolean property will return items that have the property True. A Jet filter comparing an empty string with a boolean property will return items that have the property False.

DASL Queries

In DASL syntax, you must convert True/False to an integer value, where 0 represents False and 1 represents True; likewise for Yes/No and On/Off. The DASL filter to return unread items is as follows:

criteria = "@SQL=" & Chr(34) & "urn:schemas:httpmail:read" & Chr(34) _ & " = 0"

Support and feedback

Have questions or feedback about Office VBA or this documentation? Please see Office VBA support and feedback for guidance about the ways you can receive support and provide feedback.