算法实现：
K线存储过程，定义一个n的日均线，存储过程如下图，初始值全部赋值为0
0 | 1 | 2 | 3 | 4 | … | n-1 |
n%n | 1%n | 2%n | 3%n | 4%n | … | （n-1）%n |
n …..
Java程序直接处理从数据库中获取到的数据
①当i<n时，均值结果为avg=sum(a[0]，a[n-1])/i
②当i>=n时，均值结果为avg=sum(a[0]，a[n-1])/n
MySql存储过程算法实现：
set i=i+1;
IF i<n THEN
SELECT SUM(rate) INTO total
FROM lineK
WHERE id>=1 AND id<=i;
set rate_in_stock=total/i;
END IF;
IF i>=n THEN
SELECT SUM(rate) INTO total
FROM lineK
WHERE id>=i+1-n AND id<=i;
set rate_in_stock=total/n;
END IF;
存储过程代码
DELIMITER $$
DROP PROCEDURE IF EXISTS `yggl`.`CursorProc` $$
CREATE PROCEDURE `yggl`.`CursorProc` (IN n INT)
BEGIN
DECLARE no_more_lineK ,i INT DEFAULT 0;
DECLARE total DOUBLE DEFAULT 0;
DECLARE rate_in_stock DOUBLE DEFAULT 0;
DECLARE SUM DOUBLE DEFAULT 0;
DECLARE prd_id VARCHAR(255);
DECLARE cur_lineK CURSOR FOR SELECT id FROM lineK; /*First: Delcare a cursor,首先这里对游标进行定义*/
DECLARE CONTINUE HANDLER FOR NOT FOUND SET no_more_lineK = 1; /*when "not found" occur,just continue,这个是个条件处理,针对NOT FOUND的条件*/
/* for loggging information 创建个临时表格来保持*/
DROP TABLE IF EXISTS `infolog`;
CREATE TABLE infolog (
Id int(11) NOT NULL AUTO_INCREMENT,
Rate DOUBLE NOT NULL,
PRIMARY KEY (Id)
);
OPEN cur_lineK; /*Second: Open the cursor 接着使用OPEN打开游标*/
FETCH cur_lineK INTO prd_id; /*Third: now you can Fetch the row 把第一行数据写入变量中,游标也随之指向了记录的第一行*/
REPEAT
set i=i+1;
IF i<n THEN
SELECT SUM(rate) INTO total
FROM lineK
WHERE id>=1 AND id<=i;
set rate_in_stock=total/i;
END IF;
IF i>=n THEN
SELECT SUM(rate) INTO total
FROM lineK
WHERE id>=i+1-n AND id<=i;
set rate_in_stock=total/n;
END IF;
INSERT INTO infolog(Rate)
VALUES (rate_in_stock);
FETCH cur_lineK INTO prd_id;
UNTIL no_more_lineK = 1
END REPEAT;
CLOSE cur_lineK; /*Finally: cursor need be closed 用完后记得用CLOSE把资源释放掉*/
SELECT * FROM infolog;
END $$
DELIMITER ;
完整案例打包：http://download.csdn.net/detail/kevin_iot/9707791
技术参考文档：
1、draw2D参考事例http://www.ibm.com/developerworks/cn/opensource/os-draw2dswt/
2、java连接mysql示例：
http://hzy3774.iteye.com/blog/1689525
3、hFreechart参考示例
