mysql 存储过程 游标 判断游标是否为空

BEGIN
	DECLARE id long;
	DECLARE Done INT DEFAULT 0;
	DECLARE cashamount DECIMAL(10,2) DEFAULT 0.00;
	DECLARE scorecamount INT DEFAULT 0;
	DECLARE userids CURSOR FOR SELECT userid from info_user where isreal = 1;
	DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET Done = 1;

	OPEN userids;

	REPEAT

		FETCH userids into id;

		DELETE FROM		info_black	WHERE userid=id;
			DELETE FROM		info_consignee	  	WHERE userid=id;

			SET	cashamount = (SELECT balance	FROM  trade_account AS b WHERE  b.ownertype = 1 AND b.ownerid = id	AND accounttype = 1);
			UPDATE trade_account SET balance = balance + cashamount WHERE  accountid = 6500000000000000;

			SET scorecamount = (SELECT balance	FROM  trade_account AS b WHERE  b.ownertype = 1 AND b.ownerid = id	AND accounttype = 0);
			UPDATE trade_account SET balance = balance + scorecamount WHERE  accountid = 3500000000000000;

			DELETE a,b FROM trade_cashtrade AS a INNER JOIN trade_account AS b WHERE  b.ownertype = 1 AND b.ownerid = id	AND (a.payerid = b.accountid OR a.payeeid = b.accountid);
			DELETE a,b FROM trade_scoretrade AS a INNER JOIN trade_account AS b WHERE  b.ownertype = 1 AND b.ownerid = id	AND (a.payerid = b.accountid OR a.payeeid = b.accountid);
	UNTIL Done END REPEAT;

	CLOSE userids;
END