how to convert persian number to int

问题

There is a nvarchar(100) column named value, when users insert into this column I need to check this code below in a trigger:

if exists
(
    select *
    from inserted i
    where isnumeric(value)=0
)
begin
    rollback transaction
    raiserror('when productType is numeric, You have to insert numeric character',18,1)
    return
end

but in application interface numbers inserted in persian, so always isnumeric(value)=0.

For example I need to if user insert ۴۵ in interface in my trigger value shown as 45.

So far I use CAST,CONVERT and collate Persian_100_CI_AI but I couldn't get any result.

Thanks.

回答1:

Which version of SQL Server? v2017+ offers a new function TRANSLATE.

Might be, there is a more elegant way, but a pragmatic one is this:

DECLARE @PersianNumber NVARCHAR(100)=N'۴۵';
SELECT CAST(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE
           (@PersianNumber,N'۰',N'0'),N'۱',N'1'),N'۲',N'2'),N'۳',N'3'),N'۴',N'4')
                          ,N'۵',N'5'),N'۶',N'6'),N'۷',N'7'),N'۸',N'8'),N'۹',N'9') AS INT);

回答2:

Take a look at this topic, it's the opposite of what you asked but it might help you if you could reverse it :

https://social.msdn.microsoft.com/Forums/sqlserver/en-US/a44ce5c1-d487-4043-be73-b64fa98ed7a5/converting-english-numbers-to-arabic-numbers-and-vice-versa

If you are using the latest version of sql server, try this link :

https://docs.microsoft.com/en-us/sql/t-sql/functions/translate-transact-sql

the obvious thing is that SQL does not have a solution out-of-the-box and you have to implement some kind of function yourself and use the returned value in the WHERE statement.

I have used Shungo's answer to implement the function you need (also works for English numbers or a mix of both):

CREATE FUNCTION IS_NORMALIZED_NUMBER (@PersianNumber NVARCHAR(MAX))
RETURNS NVARCHAR(MAX)
BEGIN
    SET @PersianNumber = CAST(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE
           (@PersianNumber,N'۰',N'0'),N'۱',N'1'),N'۲',N'2'),N'۳',N'3'),N'۴',N'4')
                          ,N'۵',N'5'),N'۶',N'6'),N'۷',N'7'),N'۸',N'8'),N'۹',N'9') AS NVARCHAR(MAX));
    RETURN ISNUMERIC(@PersianNumber)
END

Here is a more optimized version (which will only work for Persian numbers) :

CREATE FUNCTION IS_NUMBER (@PersianNumber NVARCHAR(MAX))
RETURNS NVARCHAR(MAX)
BEGIN
    RETURN IIF(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE
           (@PersianNumber,N'۰',N''),N'۱',N''),N'۲',N''),N'۳',N''),N'۴',N'')
                          ,N'۵',N''),N'۶',N''),N'۷',N''),N'۸',N''),N'۹',N'') = N'',1 ,0 );
END

来源：https://stackoverflow.com/questions/49511465/how-to-convert-persian-number-to-int

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sql

sql-server

data-conversion