Editar
¡Eureka! Literalmente mi primera función SQL. No se ofrece garantía. Haga una copia de seguridad de sus datos antes de usar. :)
Primero, defina la siguiente función:
DROP FUNCTION IF EXISTS lowerword;
SET GLOBAL log_bin_trust_function_creators=TRUE;
DELIMITER |
CREATE FUNCTION lowerword( str VARCHAR(128), word VARCHAR(5) )
RETURNS VARCHAR(128)
DETERMINISTIC
BEGIN
DECLARE i INT DEFAULT 1;
DECLARE loc INT;
SET loc = LOCATE(CONCAT(word,' '), str, 2);
IF loc > 1 THEN
WHILE i <= LENGTH (str) AND loc <> 0 DO
SET str = INSERT(str,loc,LENGTH(word),LCASE(word));
SET i = loc+LENGTH(word);
SET loc = LOCATE(CONCAT(word,' '), str, i);
END WHILE;
END IF;
RETURN str;
END;
|
DELIMITER ;
Esto reducirá todas las apariciones de la palabra en str.
Luego defina esta función propia modificada:
DROP FUNCTION IF EXISTS tcase;
SET GLOBAL log_bin_trust_function_creators=TRUE;
DELIMITER |
CREATE FUNCTION tcase( str VARCHAR(128) )
RETURNS VARCHAR(128)
DETERMINISTIC
BEGIN
DECLARE c CHAR(1);
DECLARE s VARCHAR(128);
DECLARE i INT DEFAULT 1;
DECLARE bool INT DEFAULT 1;
DECLARE punct CHAR(17) DEFAULT ' ()[]{},[email protected];:?/';
SET s = LCASE( str );
WHILE i <= LENGTH( str ) DO
BEGIN
SET c = SUBSTRING( s, i, 1 );
IF LOCATE( c, punct ) > 0 THEN
SET bool = 1;
ELSEIF bool=1 THEN
BEGIN
IF c >= 'a' AND c <= 'z' THEN
BEGIN
SET s = CONCAT(LEFT(s,i-1),UCASE(c),SUBSTRING(s,i+1));
SET bool = 0;
END;
ELSEIF c >= '0' AND c <= '9' THEN
SET bool = 0;
END IF;
END;
END IF;
SET i = i+1;
END;
END WHILE;
SET s = lowerword(s, 'A');
SET s = lowerword(s, 'An');
SET s = lowerword(s, 'And');
SET s = lowerword(s, 'As');
SET s = lowerword(s, 'At');
SET s = lowerword(s, 'But');
SET s = lowerword(s, 'By');
SET s = lowerword(s, 'For');
SET s = lowerword(s, 'If');
SET s = lowerword(s, 'In');
SET s = lowerword(s, 'Of');
SET s = lowerword(s, 'On');
SET s = lowerword(s, 'Or');
SET s = lowerword(s, 'The');
SET s = lowerword(s, 'To');
SET s = lowerword(s, 'Via');
RETURN s;
END;
|
DELIMITER ;
Uso
Verifique que funcione como se esperaba:
SELECT tcase(title) FROM table;
Úsalo:
UPDATE table SET title = tcase(title);
Fuente:http://www.artfulsoftware.com/infotree/queries .php?&bw=1070#122
