Difference between revisions of "EMPTY()"
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==Purpose== | ==Purpose== | ||
Function to check for empty value | Function to check for empty value | ||
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==Syntax== | ==Syntax== | ||
EMPTY(<expC> | <expD> | <expT> | <expL> | <memofield> | <expN>) | EMPTY(<expC> | <expD> | <expT> | <expL> | <memofield> | <expN>) | ||
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==See Also== | ==See Also== | ||
− | [[CTOD()]], [[CTOT()]], [[IIF()]], [[SET CENTURY]], [[SET DATE]], [[SET MARK]], [[SET SECONDS]], [[SPACE()]], [[TYPE()]] | + | [[CTOD()]], [[CTOT()]], [[EVL()]], [[IIF()]], [[SET CENTURY]], [[SET DATE]], [[SET MARK]], [[SET SECONDS]], [[SPACE()]], [[TYPE()]] |
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==Description== | ==Description== | ||
The EMPTY() function returns .T. if the specified expression is 'empty'. | The EMPTY() function returns .T. if the specified expression is 'empty'. | ||
− | + | {| class="wikitable" width="100%" | |
− | {| class="wikitable" | + | !width="30%"|Data Type||Empty |
− | !Data Type||Empty | + | |
|- | |- | ||
|Character||Space(0), "", [], ‘’, no text entered | |Character||Space(0), "", [], ‘’, no text entered | ||
|- | |- | ||
− | |Date||CTOD(""),{}, {00/00/0000}, { / / } and other SET CENTURY, SET MARK and SET DATE variations | + | |valign="top"|Date||CTOD(""),{}, {00/00/0000}, { / / } and other SET CENTURY, SET MARK and SET DATE variations |
|- | |- | ||
− | |Datetime||CTOT("") , { / / : : AM} and other SET CENTURY, SET MARK, SET SECONDS and SET DATE variations | + | |valign="top"|Datetime||CTOT("") , { / / : : AM} and other SET CENTURY, SET MARK, SET SECONDS and SET DATE variations |
|- | |- | ||
|Logical||.F. | |Logical||.F. | ||
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|} | |} | ||
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</code> | </code> | ||
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[[Category:Documentation]] | [[Category:Documentation]] | ||
[[Category:Functions]] | [[Category:Functions]] |
Latest revision as of 12:20, 1 February 2013
Contents
Purpose
Function to check for empty value
Syntax
EMPTY(<expC> | <expD> | <expT> | <expL> | <memofield> | <expN>)
See Also
CTOD(), CTOT(), EVL(), IIF(), SET CENTURY, SET DATE, SET MARK, SET SECONDS, SPACE(), TYPE()
Description
The EMPTY() function returns .T. if the specified expression is 'empty'.
Data Type | Empty |
---|---|
Character | Space(0), "", [], , no text entered |
Date | CTOD(""),{}, {00/00/0000}, { / / } and other SET CENTURY, SET MARK and SET DATE variations |
Datetime | CTOT("") , { / / : : AM} and other SET CENTURY, SET MARK, SET SECONDS and SET DATE variations |
Logical | .F. |
Memo | No data entered |
Numeric | 0 |
Example
if empty(name + address) dialog box "Name and address not specified." endif