SetEmpty method

Assigns the empty value in an attribute, variable, or business component depending on its types.

AttributeName | &VarName.SetEmpty()

Where:

AttributeName
Is the Attribute name to which the method is applied.

&VarName
Is the Variable name to which the method is applied.

Data Types: Audio, Blob, BlobFile, Character, VarChar, LongVarChar, Date, Date, DateTime, Geography, GeoLine, GeoPoint, GeoPolygon, GUID, Image, Numeric, Video, Extended data types
Generators: .NET, .NET Framework, Java, RPG, Cobol, Ruby (up to GeneXus X Evolution 3), Visual FoxPro (up to GeneXus X Evolution 3)

The following table shows the corresponding empty value for each data type

Data Type	Empty value
Boolean	False
Character(N), VarChar(N), LongVarChar(N)	N-blanks
Date	001-01-01
DateTime	0001-01-01 00:00:00
Numeric	0.0
Time	00:00:00

Rule defined in an Owner Transaction object:

OwnerCel.SetEmpty() if OwnerName.IsEmpty();

Code defined inside a Procedure Source or inside an object Event:

If OwnerName.IsEmpty()
   OwnerCel.SetEmpty()
EndIf

Notes:

Since GeneXus 15 Upgrade 9, Apple offline apps will consider Date/DateTime empty value as 0001-01-01 instead of 1970-01-01. In case you use an empty value for displaying data, those records with the old empty date value (1970-01-01) will start to be displayed. The following offline Procedure script will fix the problem in the Offline Database:
```
&oldEmptyDate = ymdtod(1970,1,1)
For each
    where DocumentDate = &oldEmptyDate
      DocumentDate.SetEmpty()
endfor
commit
```
Since GeneXus 16 upgrade 2, this method can be used in Client-side Events in Native Mobile Applications for Apple.