Untitled query #18218

SQL

DELIMITER $$;
CREATE FUNCTION wordcount(str TEXT)
            RETURNS INT
            DETERMINISTIC
            SQL SECURITY INVOKER
            NO SQL
       BEGIN
         DECLARE wordCnt, idx, maxIdx INT DEFAULT 0;
         DECLARE currChar, prevChar BOOL DEFAULT 0;
         SET maxIdx=char_length(str);
         WHILE idx < maxIdx DO
             SET currChar=SUBSTRING(str, idx, 1) RLIKE '[[:alnum:]]';
             IF NOT prevChar AND currChar THEN
                 SET wordCnt=wordCnt+1;
             END IF;
             SET prevChar=currChar;
             SET idx=idx+1;
         END WHILE;
         RETURN wordCnt;
       END
     $$;
DELIMITER ;
SELECT old_text, wordcount(old_text) AS "Words" FROM text;
SQL

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