Convert string to float with exponencial numbers

问题

I need to convert a string to float I need u-sql code.

the script could be an exponencial like 10^2

I tried Float.Convert but not works.

I expect

convert(10^2) = 100

回答1:

Assuming this is your own format is You will need to write a C# function to do that.

You can write code behind

https://www.purplefrogsystems.com/paul/2017/04/calling-u-sql-stored-procedures-with-c-code-behind/

or functions

https://sqlplayer.net/2017/10/functions-in-the-usql-the-hidden-gem-in-the-summer-2017-update/

回答2:

An example using U-SQL inline functions:

DECLARE @func Func <string,int?> = (s) =>{int x = Convert.ToInt32(s.Split('^')[0]); int y = Convert.ToInt32(s.Split('^')[1]); return x*y;};

DECLARE @inputFile string = @"\input\input36.csv";
DECLARE @outputFile string = @"\output\output.csv";

@input =
    EXTRACT rowId int,
            expo string
    FROM @inputFile
    USING Extractors.Csv();


@output =
    SELECT *,
           @func(expo) AS z
    FROM @input;


OUTPUT @output
TO @outputFile
USING Outputters.Csv(quoting:false);

Using this sample file, I got these results:

来源：https://stackoverflow.com/questions/54112242/convert-string-to-float-with-exponencial-numbers