Cara memeriksa Karakter Non-Ascii

15

Apa cara terbaik untuk memeriksa apakah bidang VARCHAR memiliki Karakter Non-Ascii?
CHAR(1)melalui CHAR(31)dan CHAR(127)melalui CHAR(255).

Saya mencoba menggunakan PATINDEXdan mengalami masalah berikut.

Memeriksa kisaran bawah bekerja dengan benar.

SELECT *      
FROM mbrnotes      
WHERE PATINDEX('%[' + CHAR(1)+ '-' +CHAR(31)+']%',LINE_TEXT) > 0

Data saya memiliki tiga catatan dengan 0x1E dan ketiganya dikembalikan.

Tetapi ketika saya memeriksa hanya kisaran atas:

SELECT *      
FROM mbrnotes      
WHERE PATINDEX('%[' + CHAR(127)+ '-' +CHAR(255)+']%',LINE_TEXT) > 0

Ini mengembalikan dekat dengan semua catatan dalam tabel (jumlah tabel 170737 dan kembali menghitung 170735) dan karena data saya tidak memiliki nilai dalam kisaran ini saya akan berpikir itu seharusnya tidak mengembalikan catatan.

sql-server  sql-server-2008-r2  t-sql 
— Gerhard Weiss
sumber
— Akira Yamamoto

Jawaban:

17

Kisaran dalam sintaksis pola menggunakan aturan penyortiran dari koleksi Anda.

Gunakan klausa susun biner sehingga rentang dipesan oleh kode karakter.

(Saya juga mengubahnya menjadi LIKEkarena saya menemukan itu lebih jelas daripada PATINDEX > 0)

SELECT *      
FROM mbrnotes      
WHERE LINE_TEXT LIKE '%[' + CHAR(127)+ '-' +CHAR(255)+']%'  COLLATE Latin1_General_100_BIN2
— Martin Smith
sumber
0

Jika Anda seperti saya dan Anda sudah lelah selama bertahun-tahun mencari karakter ini dalam data mengerikan perusahaan Anda, Anda dapat menggunakan fungsi ini atau menulis ulang untuk tujuan Anda sendiri. Ini memang bertele-tele, tetapi ini merupakan langkah ekstra mengidentifikasi karakter-karakter khusus jika Anda mau - garis komentar 19 - 179 untuk melakukannya.

Jika string tidak mengandung nilai ascii yang tidak dapat dicetak atau diperluas - ia mengembalikan NULL.

CREATE FUNCTION [dbo].[Find_Invalid_Chars]
(
    @SearchString VARCHAR(8000)
)
RETURNS VARCHAR(8000)
AS
BEGIN
    DECLARE @CharPosition INT, @CharVal VARCHAR(100), @ReturnVal VARCHAR(8000) = '', @isValid BIT = 1 -- Start as valid

    SET @CharPosition = 1

    WHILE @CharPosition <= DATALENGTH(@SearchString)
    BEGIN
    IF (ASCII(SUBSTRING(@SearchString, @CharPosition, 1)) NOT BETWEEN (32) AND (127))
        BEGIN
            SET @CharVal = '[' + CAST(ASCII(SUBSTRING(@SearchString, @CharPosition, 1)) AS VARCHAR(3)) + ']'
            SET @isValid = 0
            ---- Non-Printables
            --SET @CharVal = REPLACE(@CharVal, '[0]', '[NUL]')
            --SET @CharVal = REPLACE(@CharVal, '[1]', '[SOH]')
            --SET @CharVal = REPLACE(@CharVal, '[2]', '[STX]')
            --SET @CharVal = REPLACE(@CharVal, '[3]', '[ETX]')
            --SET @CharVal = REPLACE(@CharVal, '[4]', '[EOT]')
            --SET @CharVal = REPLACE(@CharVal, '[5]', '[ENQ]')
            --SET @CharVal = REPLACE(@CharVal, '[6]', '[ACK]')
            --SET @CharVal = REPLACE(@CharVal, '[7]', '[BEL]')
            --SET @CharVal = REPLACE(@CharVal, '[8]', '[BS]')
            --SET @CharVal = REPLACE(@CharVal, '[9]', '[HT]')
            --SET @CharVal = REPLACE(@CharVal, '[10]', '[LF]')
            --SET @CharVal = REPLACE(@CharVal, '[11]', '[VT]')
            --SET @CharVal = REPLACE(@CharVal, '[12]', '[FF]')
            --SET @CharVal = REPLACE(@CharVal, '[13]', '[CR]')
            --SET @CharVal = REPLACE(@CharVal, '[14]', '[SO]')
            --SET @CharVal = REPLACE(@CharVal, '[15]', '[SI]')
            --SET @CharVal = REPLACE(@CharVal, '[16]', '[DLE]')
            --SET @CharVal = REPLACE(@CharVal, '[17]', '[DC1]')
            --SET @CharVal = REPLACE(@CharVal, '[18]', '[DC2]')
            --SET @CharVal = REPLACE(@CharVal, '[19]', '[DC3]')
            --SET @CharVal = REPLACE(@CharVal, '[20]', '[DC4]')
            --SET @CharVal = REPLACE(@CharVal, '[21]', '[NAK]')
            --SET @CharVal = REPLACE(@CharVal, '[22]', '[SYN]')
            --SET @CharVal = REPLACE(@CharVal, '[23]', '[ETB]')
            --SET @CharVal = REPLACE(@CharVal, '[24]', '[CAN]')
            --SET @CharVal = REPLACE(@CharVal, '[25]', '[EM]')
            --SET @CharVal = REPLACE(@CharVal, '[26]', '[SUB]')
            --SET @CharVal = REPLACE(@CharVal, '[27]', '[ESC]')
            --SET @CharVal = REPLACE(@CharVal, '[28]', '[FS]')
            --SET @CharVal = REPLACE(@CharVal, '[29]', '[GS]')
            --SET @CharVal = REPLACE(@CharVal, '[30]', '[RS]')
            --SET @CharVal = REPLACE(@CharVal, '[31]', '[US]')
            ---- Extended Ascii
            --SET @CharVal = REPLACE(@CharVal, '[128]', '[€]')
            --SET @CharVal = REPLACE(@CharVal, '[129]', '[]]')
            --SET @CharVal = REPLACE(@CharVal, '[130]', '[‚]')
            --SET @CharVal = REPLACE(@CharVal, '[131]', '[ƒ]')
            --SET @CharVal = REPLACE(@CharVal, '[132]', '[„]')
            --SET @CharVal = REPLACE(@CharVal, '[133]', '[…]')
            --SET @CharVal = REPLACE(@CharVal, '[134]', '[†]')
            --SET @CharVal = REPLACE(@CharVal, '[135]', '[‡]')
            --SET @CharVal = REPLACE(@CharVal, '[136]', '[ˆ]')
            --SET @CharVal = REPLACE(@CharVal, '[137]', '[‰]')
            --SET @CharVal = REPLACE(@CharVal, '[138]', '[Š]')
            --SET @CharVal = REPLACE(@CharVal, '[139]', '[‹]')
            --SET @CharVal = REPLACE(@CharVal, '[140]', '[Œ]')
            --SET @CharVal = REPLACE(@CharVal, '[141]', '[]]')
            --SET @CharVal = REPLACE(@CharVal, '[142]', '[Ž]')
            --SET @CharVal = REPLACE(@CharVal, '[143]', '[]]')
            --SET @CharVal = REPLACE(@CharVal, '[144]', '[]]')
            --SET @CharVal = REPLACE(@CharVal, '[145]', '[‘]')
            --SET @CharVal = REPLACE(@CharVal, '[146]', '[’]')
            --SET @CharVal = REPLACE(@CharVal, '[147]', '[“]')
            --SET @CharVal = REPLACE(@CharVal, '[148]', '[”]')
            --SET @CharVal = REPLACE(@CharVal, '[149]', '[•]')
            --SET @CharVal = REPLACE(@CharVal, '[150]', '[–]')
            --SET @CharVal = REPLACE(@CharVal, '[151]', '[—]')
            --SET @CharVal = REPLACE(@CharVal, '[152]', '[˜]')
            --SET @CharVal = REPLACE(@CharVal, '[153]', '[™]')
            --SET @CharVal = REPLACE(@CharVal, '[154]', '[š]')
            --SET @CharVal = REPLACE(@CharVal, '[155]', '[›]')
            --SET @CharVal = REPLACE(@CharVal, '[156]', '[œ]')
            --SET @CharVal = REPLACE(@CharVal, '[157]', '[]]')
            --SET @CharVal = REPLACE(@CharVal, '[158]', '[ž]')
            --SET @CharVal = REPLACE(@CharVal, '[159]', '[Ÿ]')
            --SET @CharVal = REPLACE(@CharVal, '[160]', '[]]')
            --SET @CharVal = REPLACE(@CharVal, '[161]', '[¡]')
            --SET @CharVal = REPLACE(@CharVal, '[162]', '[¢]')
            --SET @CharVal = REPLACE(@CharVal, '[163]', '[£]')
            --SET @CharVal = REPLACE(@CharVal, '[164]', '[¤]')
            --SET @CharVal = REPLACE(@CharVal, '[165]', '[¥]')
            --SET @CharVal = REPLACE(@CharVal, '[166]', '[¦]')
            --SET @CharVal = REPLACE(@CharVal, '[167]', '[§]')
            --SET @CharVal = REPLACE(@CharVal, '[168]', '[¨]')
            --SET @CharVal = REPLACE(@CharVal, '[169]', '[©]')
            --SET @CharVal = REPLACE(@CharVal, '[170]', '[ª]')
            --SET @CharVal = REPLACE(@CharVal, '[171]', '[«]')
            --SET @CharVal = REPLACE(@CharVal, '[172]', '[¬]')
            --SET @CharVal = REPLACE(@CharVal, '[173]', '[]]')
            --SET @CharVal = REPLACE(@CharVal, '[174]', '[®]')
            --SET @CharVal = REPLACE(@CharVal, '[175]', '[¯]')
            --SET @CharVal = REPLACE(@CharVal, '[176]', '[°]')
            --SET @CharVal = REPLACE(@CharVal, '[177]', '[±]')
            --SET @CharVal = REPLACE(@CharVal, '[178]', '[²]')
            --SET @CharVal = REPLACE(@CharVal, '[179]', '[³]')
            --SET @CharVal = REPLACE(@CharVal, '[180]', '[´]')
            --SET @CharVal = REPLACE(@CharVal, '[181]', '[µ]')
            --SET @CharVal = REPLACE(@CharVal, '[182]', '[¶]')
            --SET @CharVal = REPLACE(@CharVal, '[183]', '[·]')
            --SET @CharVal = REPLACE(@CharVal, '[184]', '[¸]')
            --SET @CharVal = REPLACE(@CharVal, '[185]', '[¹]')
            --SET @CharVal = REPLACE(@CharVal, '[186]', '[º]')
            --SET @CharVal = REPLACE(@CharVal, '[187]', '[»]')
            --SET @CharVal = REPLACE(@CharVal, '[188]', '[¼]')
            --SET @CharVal = REPLACE(@CharVal, '[189]', '[½]')
            --SET @CharVal = REPLACE(@CharVal, '[190]', '[¾]')
            --SET @CharVal = REPLACE(@CharVal, '[191]', '[¿]')
            --SET @CharVal = REPLACE(@CharVal, '[192]', '[À]')
            --SET @CharVal = REPLACE(@CharVal, '[193]', '[Á]')
            --SET @CharVal = REPLACE(@CharVal, '[194]', '[Â]')
            --SET @CharVal = REPLACE(@CharVal, '[195]', '[Ã]')
            --SET @CharVal = REPLACE(@CharVal, '[196]', '[Ä]')
            --SET @CharVal = REPLACE(@CharVal, '[197]', '[Å]')
            --SET @CharVal = REPLACE(@CharVal, '[198]', '[Æ]')
            --SET @CharVal = REPLACE(@CharVal, '[199]', '[Ç]')
            --SET @CharVal = REPLACE(@CharVal, '[200]', '[È]')
            --SET @CharVal = REPLACE(@CharVal, '[201]', '[É]')
            --SET @CharVal = REPLACE(@CharVal, '[202]', '[Ê]')
            --SET @CharVal = REPLACE(@CharVal, '[203]', '[Ë]')
            --SET @CharVal = REPLACE(@CharVal, '[204]', '[Ì]')
            --SET @CharVal = REPLACE(@CharVal, '[205]', '[Í]')
            --SET @CharVal = REPLACE(@CharVal, '[206]', '[Î]')
            --SET @CharVal = REPLACE(@CharVal, '[207]', '[Ï]')
            --SET @CharVal = REPLACE(@CharVal, '[208]', '[Ð]')
            --SET @CharVal = REPLACE(@CharVal, '[209]', '[Ñ]')
            --SET @CharVal = REPLACE(@CharVal, '[210]', '[Ò]')
            --SET @CharVal = REPLACE(@CharVal, '[211]', '[Ó]')
            --SET @CharVal = REPLACE(@CharVal, '[212]', '[Ô]')
            --SET @CharVal = REPLACE(@CharVal, '[213]', '[Õ]')
            --SET @CharVal = REPLACE(@CharVal, '[214]', '[Ö]')
            --SET @CharVal = REPLACE(@CharVal, '[215]', '[×]')
            --SET @CharVal = REPLACE(@CharVal, '[216]', '[Ø]')
            --SET @CharVal = REPLACE(@CharVal, '[217]', '[Ù]')
            --SET @CharVal = REPLACE(@CharVal, '[218]', '[Ú]')
            --SET @CharVal = REPLACE(@CharVal, '[219]', '[Û]')
            --SET @CharVal = REPLACE(@CharVal, '[220]', '[Ü]')
            --SET @CharVal = REPLACE(@CharVal, '[221]', '[Ý]')
            --SET @CharVal = REPLACE(@CharVal, '[222]', '[Þ]')
            --SET @CharVal = REPLACE(@CharVal, '[223]', '[ß]')
            --SET @CharVal = REPLACE(@CharVal, '[224]', '[à]')
            --SET @CharVal = REPLACE(@CharVal, '[225]', '[á]')
            --SET @CharVal = REPLACE(@CharVal, '[226]', '[â]')
            --SET @CharVal = REPLACE(@CharVal, '[227]', '[ã]')
            --SET @CharVal = REPLACE(@CharVal, '[228]', '[ä]')
            --SET @CharVal = REPLACE(@CharVal, '[229]', '[å]')
            --SET @CharVal = REPLACE(@CharVal, '[230]', '[æ]')
            --SET @CharVal = REPLACE(@CharVal, '[231]', '[ç]')
            --SET @CharVal = REPLACE(@CharVal, '[232]', '[è]')
            --SET @CharVal = REPLACE(@CharVal, '[233]', '[é]')
            --SET @CharVal = REPLACE(@CharVal, '[234]', '[ê]')
            --SET @CharVal = REPLACE(@CharVal, '[235]', '[ë]')
            --SET @CharVal = REPLACE(@CharVal, '[236]', '[ì]')
            --SET @CharVal = REPLACE(@CharVal, '[237]', '[í]')
            --SET @CharVal = REPLACE(@CharVal, '[238]', '[î]')
            --SET @CharVal = REPLACE(@CharVal, '[239]', '[ï]')
            --SET @CharVal = REPLACE(@CharVal, '[240]', '[ð]')
            --SET @CharVal = REPLACE(@CharVal, '[241]', '[ñ]')
            --SET @CharVal = REPLACE(@CharVal, '[242]', '[ò]')
            --SET @CharVal = REPLACE(@CharVal, '[243]', '[ó]')
            --SET @CharVal = REPLACE(@CharVal, '[244]', '[ô]')
            --SET @CharVal = REPLACE(@CharVal, '[245]', '[õ]')
            --SET @CharVal = REPLACE(@CharVal, '[246]', '[ö]')
            --SET @CharVal = REPLACE(@CharVal, '[247]', '[÷]')
            --SET @CharVal = REPLACE(@CharVal, '[248]', '[ø]')
            --SET @CharVal = REPLACE(@CharVal, '[249]', '[ù]')
            --SET @CharVal = REPLACE(@CharVal, '[250]', '[ú]')
            --SET @CharVal = REPLACE(@CharVal, '[251]', '[û]')
            --SET @CharVal = REPLACE(@CharVal, '[252]', '[ü]')
            --SET @CharVal = REPLACE(@CharVal, '[253]', '[ý]')
            --SET @CharVal = REPLACE(@CharVal, '[254]', '[þ]')
            --SET @CharVal = REPLACE(@CharVal, '[255]', '[ÿ]')
        END
    ELSE
        BEGIN
            SET @CharVal = SUBSTRING(@SearchString, @CharPosition, 1)
        END

    SET @ReturnVal = @ReturnVal + @CharVal

    SET @CharPosition = @CharPosition + 1
    END

IF (@isValid = 1) SET @ReturnVal = NULL

RETURN @ReturnVal

END

Dan kemudian, menyebutnya seperti:

SELECT BadString, dbo.Find_Invalid_Chars(BadString) [Invalid Characters]
FROM #tmp_Table tmp_mc
WHERE dbo.Find_Invalid_Chars(BadString) IS NOT NULL

Output sampel:

Dengan Char Identity

Atau

Tanpa Char Identity

— John
sumber
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