• ColumnNumber Method
• Data Method
• DataAsGeography Method
• DataIsNull Method
• ExecutePostProcess Method
• FetchPage Method
• FormatData Method
• GoToRow Method
• More about the SQL ResultSet Object
• NextResult Method
• NextRow Method
• ToCSV Method
• ToCSVFile Method
• ToDBF Method
• ToExcel Method
• ToFormattedString Method
• ToGridComponentDataObject Method
• ToJSON Method
• ToJSONFile Method
• ToJSONObjectSyntax Method
• ToOpenTable Method
• ToPropertyArray Method
• ToString Method
• ToTableInfo Method
• ToXML Method

SQL::ResultSetDataIsNull Method

Syntax

Arguments

ColumnNumeric Character

The column index or column name.

Returns

ResultLogical

.T. = The data is NULL. .F. = The data is not NULL.

Description

Determine whether a given element is Null.

Discussion

The DataIsNull() method determines whether a given element in a SQL::ResultSet is Null.

Example

dim conn as SQL::Connection
dim args as SQL::Arguments
dim sql as C
sql = "select * from customers where country = :country"

args.set("country","Spain")

if .not. conn.open("::Name::AADemo-Northwind")
    ui_msg_box("Error", conn.CallResult.text)
    end
end if

if .not. conn.execute(sql,args)
    ui_msg_box("Error", conn.CallResult.text)
    conn.close()
    end
end if

dim list as C = ""

while conn.ResultSet.nextRow()
    if .not. conn.ResultSet.DataIsNull(4) then
        list = list + conn.ResultSet.Data(4) + crlf()
    end if
end while

conn.close()

ui_msg_box("SQL::ResultSet DataIsNull()","Column 4 Values: " + crlf(2) + list)