Datatypes
of DataWindow property expressions in PowerBuilder
DataWindow property values
The values of DataWindow object properties are strings. These
strings can contain numeric or yes/no values, but the values you access
are strings, not integers or boolean values.
Although the property values are really strings, the PowerScript
compiler allows you to assign numbers and boolean values to properties
whose strings represent numeric values or contain yes/no strings. This
does not mean the datatype is integer or boolean. It is just a
convenience when assigning a value to the property.
For example, both of these statements are correct:
|
1 2 |
dw_1.Object.empname.Border = 1 dw_1.Object.empname.Border = '1' |
DataWindow property
expressions
In PowerBuilder, the datatype of a property expression is Any (not
string), but the value of the data in the Any variable is a string. This
may sound like an unnecessary distinction, but it does matter when you
use a property expression as a method argument. If the method does not
accept an Any variable as an argument, you might need to use the
String function to cast the data to the correct datatype.
For example, because the MessageBox function accepts a string
argument not an Any datatype, the property expression is enclosed in a
String conversion function:
|
1 |
MessageBox("Border", & String(dw_1.Object.empname.Border)) |