mysql存储过程2

DROP PROCEDURE IF EXISTS f_qr_album;

DELIMITER $$

CREATE PROCEDURE f_qr_album
(
	IN	_albumid		VARCHAR(10),
	IN	_albumname		VARCHAR(10),
	IN	_releasedate	VARCHAR(10),
	IN	_publisher		VARCHAR(10),
	IN	_albumdesc		VARCHAR(10),
	
	IN	_recordstart	INTEGER(10),
	IN	_recordend		INTEGER(10),
	IN	_querytype		INTEGER(10),
	OUT	_recordnum		INTEGER(10),
	OUT	_recordsum		INTEGER(10),
	OUT	_ret			INTEGER(10)
)
BEGIN
	DECLARE _sql VARCHAR(500);
	DECLARE CONTINUE HANDLER FOR NOT FOUND set _ret = -1;
	set @sql = ' from t_album where 1 = 1 ';
	set _ret = 0;
	
	-- 1 查询总数 2 查询结果集
	-- IF ISNULL(_albumid) THEN
	IF _albumid IS NOT NULL THEN
		SET @sql = CONCAT(' and albumid = ', _albumid);
	ELSE
		IF _albumname IS NOT NULL THEN
			SET @sql = CONCAT(@sql, ' and albumname like ', _albumname);
		END IF;
		IF _releasedate IS NOT NULL THEN
			SET @sql = CONCAT(@sql, ' and releasedate like ', DATE(_releasedate));
		END IF;
		IF _publisher IS NOT NULL THEN
			SET @sql = CONCAT(@sql, ' and publisher like ', _publisher);
		END IF;
		IF _albumdesc IS NOT NULL THEN
			SET @sql = CONCAT(@sql, ' and albumdesc like ', _albumdesc);
		END IF;
		
	END IF;
	
	IF _querytype = 1 THEN
		SET @sql = CONCAT('select count(*) ', @sql);
	ELSE
		SET @sql = CONCAT('select * ', @sql);
	END IF;
	
	PREPARE _sql from @sql;
	EXECUTE _sql;
	DEALLOCATE PREPARE _sql;

END
$$

DELIMITER ;