4d_function

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4D v20

4d_function_call



	Command 4d_function_{FN sql_name ([arithmetic_expression, ..., arithmetic_expression]) AS sql_data_type_name}

Description

A 4d_function_call can be used to execute a 4D function that returns a value.

The sql_name of the function is preceded by the FN keyword and followed by one or more arithmetic_expression type arguments. The value returned by the function will be of the type defined by the sql_data_type_name passed.

Example

Here is an example using functions to extract from the MOVIES table the number of actors for each movie having at least 7 actors:

 C_LONGINT($NrOfActors)

 ARRAY TEXT(aMovieTitles;0)

 ARRAY LONGINT(aNrActors;0)

 

 $NrOfActors:=7

 Begin SQL

    SELECT Movie_Title, {FN Find_Nr_Of_Actors(ID) AS NUMERIC}

    FROM MOVIES

    WHERE {FN Find_Nr_Of_Actors(ID) AS NUMERIC} >= :$NrOfActors

    ORDER BY 1

    INTO :aMovieTitles; :aNrActors

 End SQL

Siehe auch

arithmetic_expression
sql_data_type_name
sql_name