SQL查詢刪除特殊字符

我在具有特殊字符的mysql表中有varchar字段。我想使用MYSQL QUERY刪除該字符串中的所有特殊字符。SQL查詢刪除特殊字符

2012-09-29 ram kumar

那些特殊字符是什麼？ –

特殊字符，如'_'，' - '，'\'等，我也想刪除空格 –

@ramkumar我認爲你需要比「等」更具體。也許這更容易告訴你想要保持哪些字符_keep_？ –

MySQL不支持這樣的查詢。 MySQL查詢中你最好的拍攝是一個很大如下：

update TABLENAME 
set FIELDNAME = replace(FIELDNAME,'_','')

來源

2012-09-29 11:36:17 Maringo

偉大的答案。真的很有幫助。謝謝。繼續努力吧... –

使用

update table_name set field_name = REPLACE(field_name,'/','')

來源

2012-09-29 11:31:19

非常感謝你..它的工作 –

替換以下字符

~ ! @ # $ %^& * () _ + 
` - = 
{ } | 
[ ] \ 
: " 
; ' 

< > ? 
, .

這個SQL

SELECT note as note_original, 

    REPLACE(
     REPLACE(
      REPLACE(
       REPLACE(
        REPLACE(
         REPLACE(
          REPLACE(
           REPLACE(
            REPLACE(
             REPLACE(
              REPLACE(
               REPLACE(
                REPLACE(
                 REPLACE(
                  REPLACE(
                   REPLACE(
                    REPLACE(
                     REPLACE(
                      REPLACE(
                       REPLACE(
                        REPLACE(
                         REPLACE(
                          REPLACE(
                           REPLACE(
                            REPLACE(
                             REPLACE(
                              REPLACE(
                               REPLACE(
                                REPLACE(
                                 REPLACE(
                                  REPLACE(
                                   REPLACE(
                                    REPLACE(note, '"', ''), 
                                   '.', ''), 
                                  '?', ''), 
                                 '`', ''), 
                                '<', ''), 
                               '=', ''), 
                              '{', ''), 
                             '}', ''), 
                            '[', ''), 
                           ']', ''), 
                          '|', ''), 
                         '\'', ''), 
                        ':', ''), 
                       ';', ''), 
                      '~', ''), 
                     '!', ''), 
                    '@', ''), 
                   '#', ''), 
                  '$', ''), 
                 '%', ''), 
                '^', ''), 
               '&', ''), 
              '*', ''), 
             '_', ''), 
            '+', ''), 
           ',', ''), 
          '/', ''), 
         '(', ''), 
        ')', ''), 
       '-', ''), 
      '>', ''), 
     ' ', '-'), 
    '--', '-') as note_changed FROM invheader

來源

2015-02-11 08:43:15

您可以使用以下功能

DROP FUNCTION IF EXISTS `stripSpeciaChars`; 
DELIMITER ;; 
CREATE FUNCTION `stripSpeciaChars`(`dirty_string` varchar(2048),allow_space TINYINT,allow_number TINYINT,allow_alphabets TINYINT,no_trim TINYINT) RETURNS varchar(2048) CHARSET utf8 
BEGIN 
/** 
* MySQL function to remove Special characters, Non-ASCII,hidden characters leads to spaces, accents etc 
* Downloaded from http://DevZone.co.in 
* @param VARCHAR dirty_string : dirty string as input 
* @param VARCHAR allow_space : allow spaces between string in output; takes 0-1 as parameter 
* @param VARCHAR allow_number : allow numbers in output; takes 0-1 as parameter 
* @param VARCHAR allow_alphabets : allow alphabets in output; takes 0-1 as parameter 
* @param VARCHAR no_trim : don't trim the output; takes 0-1 as parameter 
* @return VARCHAR clean_string : clean string as output 
* 
* Usage Syntax: stripSpeciaChars(string,allow_space,allow_number,allow_alphabets,no_trim); 
* Usage SQL> SELECT stripSpeciaChars("sdfa7987*&^&*ÂÃ ÄÅÆÇÈÉÊ sd sdfgËÌÍÎÏÑ ÒÓÔÕÖØÙÚàáâã sdkarkhru",0,0,1,0); 
* result : sdfasdsdfgsdkarkhru 
*/ 
     DECLARE clean_string VARCHAR(2048) DEFAULT ''; 
     DECLARE c VARCHAR(2048) DEFAULT ''; 
     DECLARE counter INT DEFAULT 1; 

     DECLARE has_space TINYINT DEFAULT 0; -- let spaces in result string 
     DECLARE chk_cse TINYINT DEFAULT 0; 
     DECLARE adv_trim TINYINT DEFAULT 1; -- trim extra spaces along with hidden characters, new line characters etc.  

     if allow_number=0 and allow_alphabets=0 then 
     RETURN NULL; 
     elseif allow_number=1 and allow_alphabets=0 then 
     set chk_cse =1; 
    elseif allow_number=0 and allow_alphabets=1 then 
     set chk_cse =2; 
     end if;  

     if allow_space=1 then 
     set has_space =1; 
     end if; 

     if no_trim=1 then 
     set adv_trim =0; 
     end if; 

     IF ISNULL(dirty_string) THEN 
      RETURN NULL; 
     ELSE 

     CASE chk_cse 
     WHEN 1 THEN 
     -- return only Numbers in result 
     WHILE counter <= LENGTH(dirty_string) DO 

        SET c = MID(dirty_string, counter, 1); 

        IF ASCII(c) = 32 OR ASCII(c) >= 48 AND ASCII(c) <= 57 THEN 
         SET clean_string = CONCAT(clean_string, c); 
        END IF; 

        SET counter = counter + 1; 
      END WHILE; 
     WHEN 2 THEN 
     -- return only Alphabets in result 
     WHILE counter <= LENGTH(dirty_string) DO 

        SET c = MID(dirty_string, counter, 1); 

        IF ASCII(c) = 32 OR ASCII(c) >= 65 AND ASCII(c) <= 90 OR ASCII(c) >= 97 AND ASCII(c) <= 122 THEN 
         SET clean_string = CONCAT(clean_string, c); 
        END IF; 

        SET counter = counter + 1; 
      END WHILE; 
     ELSE 
     -- return numbers and Alphabets in result 
     WHILE counter <= LENGTH(dirty_string) DO 

        SET c = MID(dirty_string, counter, 1); 

        IF ASCII(c) = 32 OR ASCII(c) >= 48 AND ASCII(c) <= 57 OR ASCII(c) >= 65 AND ASCII(c) <= 90 OR ASCII(c) >= 97 AND ASCII(c) <= 122 THEN 
         SET clean_string = CONCAT(clean_string, c); 
        END IF; 

        SET counter = counter + 1; 
      END WHILE;  
    END CASE;    
     END IF; 


     -- remove spaces from result 
     if has_space=0 then 
     SET clean_string =REPLACE(clean_string,' ',''); 
     end if; 

     -- remove extra spaces, newline,tabs. from result 
    if adv_trim=1 then 
     SET clean_string =TRIM(Replace(Replace(Replace(clean_string,'\t',''),'\n',''),'\r','')); 
     end if;  

     RETURN clean_string; 
END 
;; 
DELIMITER ; 
SELECT stripSpeciaChars("foo79ÒÓÔÕÖØÙÚàáâã 87*&bÄÅÆÇÈÉÊar",1,0,1,1); -- result foo bar

來源

2015-03-30 15:36:40

SQL查詢刪除特殊字符

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