mysql函数实例-统计月登陆用户数

统计月使用用户数，仅作备忘。

CREATE FUNCTION  statics_user_login_month() RETURNS int(11)
    COMMENT '月使用用户数\r\n'
BEGIN
	#Routine body goes here...
	DECLARE stopFlag INT DEFAULT 0 ;
	DECLARE _shop_id INT(11) DEFAULT 0;
	DECLARE _device VARCHAR(50);
	DECLARE _a_token CHAR(64) DEFAULT '-1';
	DECLARE _s_token VARCHAR(64) DEFAULT NULL;
	DECLARE _use_count INT(11) DEFAULT 0;
	DECLARE _month_time date;
	
	#统计上月的食客登录用户
	DECLARE cur1 CURSOR FOR SELECT id, device, a_token, s_token FROM visitor_user 
		WHERE DATE_FORMAT(off_time, '%Y-%m') = DATE_FORMAT((curdate() - 1), '%Y-%m');	

	DECLARE CONTINUE HANDLER FOR NOT FOUND SET stopFlag=1;

	OPEN cur1;

	FETCH cur1 INTO _shop_id, _device, _a_token, _s_token;
	WHILE  stopFlag = 0 do
		INSERT INTO report_user_login_month_detail(id, shop_id, month_time, device, a_token, s_token) 
			VALUES (UUID(), _shop_id, DATE_FORMAT((curdate() - 1), '%Y-%m'), _device, _a_token, _s_token);

		FETCH cur1 INTO _shop_id, _device, _a_token, _s_token;
	END WHILE;

  CLOSE cur1;

	set _month_time = DATE_FORMAT((curdate() - 1), '%Y-%m');
	
	#统计上月登录用户数
	SELECT COUNT(device) INTO _use_count FROM visitor_user 
		WHERE DATE_FORMAT(off_time, '%Y-%m') = _month_time;	

	INSERT INTO report_user_login_month(id, month_time, use_count, type_client)
		VALUES(UUID(), _month_time, _use_count, 0);
	
	RETURN 1;
END