TRANSLATE function in SQL SERVER

Question

I read that there is a function equivalent to the standard function TRANSLATE under DB2 under SQL Server 2017. But how to do under earlier versions?

For definition of fu

Answer 1

I propose my translate function:

CREATE FUNCTION [dbo].[F_Translate]
(
       @String   varchar(8000), 
       @FromChar varchar(200), 
       @ToChar   varchar(200)
)
RETURNS varchar(8000)
AS
BEGIN
        DECLARE @result as varchar(8000) = NULL
        DECLARE @currentChar as char(1) = NULL
        DECLARE @CurrentIndexFounded as int = 0
        DECLARE @CurrentIndexString as int = 0

        IF(@FromChar IS NULL OR @ToChar IS NULL)
        BEGIN
            return cast('Parameters @FromChar and @ToChar must contains 1 caracter minimum' as int);
        END
        ELSE IF(DATALENGTH(@FromChar) <> DATALENGTH(@ToChar) OR DATALENGTH(@FromChar) = 0)
        BEGIN
            return cast('Parameters @FromChar and @ToChar must contain the same number of characters (at least 1 character)' as int);
        END

       IF(@String IS NOT NULL) 
       BEGIN
            SET  @result = '';
            WHILE(@CurrentIndexString < DATALENGTH(@String))
            BEGIN 
                    SET @CurrentIndexString = @CurrentIndexString + 1;
                    SET @currentChar = SUBSTRING(@String, @CurrentIndexString, 1);
                    SET @CurrentIndexFounded  = CHARINDEX(@currentChar COLLATE Latin1_General_CS_AS, @FromChar COLLATE Latin1_General_CS_AS);
                    IF(@CurrentIndexFounded > 0)
                    BEGIN
                            SET @result = CONCAT(@result, SUBSTRING(@ToChar, @CurrentIndexFounded, 1)) ;
                    END
                    ELSE
                    BEGIN
                            SET @result = CONCAT(@result, @currentChar);
                    END
             END
       END
       return @result
END