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VARIANT is a data type intended to store values of different scalar data types. It is not a built-in 4gl data type - it was implemented specifically for Lycia and Lycia users. Variables defined as VARIANT take the type of a variable or a constant assigned to this VARIANT variable.
Full article about this data is available here:
Below you can find a simple 4GL application which demonstrates the VARIANT variable dynamically changing its data type.
4GL:
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MAIN
DEFINE
var_char CHAR(40),
var_datetime DATETIME YEAR TO FRACTION(5),
var_integer INTEGER,
var_variant VARIANT
##### VARIANT as CHAR #####
LET var_char = "abc"
CALL my_func(var_char) RETURNING var_char
DISPLAY "main: var_char = ", var_char
##### VARIANT as INT #####
CALL my_func(123) RETURNING var_integer
DISPLAY "main: var_integer = ", var_integer
##### VARIANT as DATETIME #####
LET var_datetime = "9999-12-31 23:59:59.99999"
CALL my_func(var_datetime)RETURNING var_datetime
DISPLAY "main: var_datetime = ", var_datetime
CALL fgl_getkey()
END MAIN
FUNCTION my_func(p_variant)
DEFINE p_variant VARIANT
DISPLAY "my_func(): p_variant is ", p_variant.gettypefullname()
RETURN p_variant
END FUNCTION |
Please find below the link to our Gitlab repository which contains 4GL applications examples.
Follow instructions in this article in order to add the above-mentioned repository to your Lycia IDE.
Feel free to contact us in case if any additional information or assistance is needed.