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How to detect a string containing double-byte character?

  • October 18, 2010 at 5:09 am

    #230541

    in a column datatype in nvarchar

    how can i detect if the string contains any double-byte character such as Chinese, Japanese or Korean?

    Thanks~

  • October 18, 2010 at 5:13 am

    #1238325

    Sounds like you need to use some ANSI searches to find those. What's your collation set as, BTW?

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  • October 18, 2010 at 6:05 am

    #1238346

    You could try comparing the nvarchar string to the string cast as varchar.

    DECLARE @str1 nvarchar(20)

    ,@str2 nvarchar(20)

    SELECT @str1 = N'AB' + NCHAR(12354) + N'CD'

    ,@str2 = N'ABCD'

    IF @str1 <> CAST(@str1 AS varchar(20))

    PRINT 'Str1 contains unicode character'

    ELSE

    PRINT 'Str1 contains no unicode'

    IF @str2 <> CAST(@str2 AS varchar(20))

    PRINT 'Str2 contains unicode character'

    ELSE

    PRINT 'Str2 contains no unicode'

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