MYSQL 不依赖其他表构建日期范围内的连续月份或日期

-- 指定时间内的连续日期

-- 定义自增变量

SET @i = -1;

-- 指定日期范围

SET @sdt = '2015-08-01';

SET @edt = '2015-08-31';

-- 创建指定日期间记录数天数需要 加 1

SET @sql = REPEAT(" select 1 as tid union all", DATEDIFF(@edt, @sdt)+1);

-- 将最后一个union all 去掉

SET @sql = LEFT(@sql, LENGTH(@sql) - LENGTH("union all"));

-- 拼接sql

SET @sql = CONCAT("select date_add('", @sdt, "', interval @i:=@i+1 day) as date from (",@sql,") as tmp");

PREPARE stmt FROM @sql;

EXECUTE stmt;

-- 指定时间内的连续月份

-- 定义自增变量

SET @i = -1;

-- 指定日期范围

SET @sdt = '2015-01-01';

SET @edt = '2015-12-31';

-- 创建指定月份间记录

SET @sql = REPEAT(" select 1 as tid union all",

(SELECT

PERIOD_DIFF(EXTRACT(YEAR_MONTH FROM @edt),

EXTRACT(YEAR_MONTH FROM @sdt))+1));

-- 将最后一个union all 去掉

SET @sql = LEFT(@sql,LENGTH(@sql)-LENGTH(" union all"));

-- 拼接sql

SET @sql = CONCAT("select 1 AS tid, date_add('",@sdt,"', interval @i:=@i+1 MONTH) as mh

FROM (",@sql,") AS t");

PREPARE stmt FROM @sql;

EXECUTE stmt;

应用示例：

-- 创建基础资料表

CREATE TABLE `contract` (

`id` int(11) DEFAULT NULL,

`startday` datetime DEFAULT NULL,

`endday` datetime DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

INSERT INTO contract (id, startday, endday)

VALUES('1', '2014-01-01 00:00:00', '2015-12-31 00:00:00');

INSERT INTO contract (id, startday, endday)

VALUES('2', '2012-01-01 00:00:00', '2015-12-31 00:00:00');

-- 创建资料月明细表

CREATE TABLE `finance` (

`id` int(11) DEFAULT NULL,

`contract_id` int(11) DEFAULT NULL,

`targetmonth` datetime DEFAULT NULL,

`money` int(11) DEFAULT NULL

) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci

INSERT INTO myTmpDB.finance (id, contract_id, targetmonth, money)

VALUES('1','1','2015-06-16 16:52:15','50') ;

INSERT INTO myTmpDB.finance (id, contract_id, targetmonth, money)

VALUES('2','1','2015-07-16 16:52:15','60') ;

INSERT INTO myTmpDB.finance (id, contract_id, targetmonth, money)

VALUES('3','2','2015-01-16 16:52:15','80') ;

-- 创建存储过程

DELIMITER $$

DROP PROCEDURE IF EXISTS p_contract $$

CREATE PROCEDURE p_contract(IN p_cid INT)

BEGIN

-- 指定合同编号

SET @id = p_cid;

-- 定义自增变量

SET @i = -1;

-- 定义报表日期区间

SET @sdt = (SELECT startday FROM contract WHERE id = @id);

SET @edt = (SELECT CASE WHEN endday > NOW() THEN NOW()

ELSE endday END FROM contract WHERE id = @id);

-- 指定日期间月份数

SET @cnt =((SELECT

PERIOD_DIFF(EXTRACT(YEAR_MONTH FROM

CASE WHEN endday > NOW() THEN NOW() ELSE endday END),

EXTRACT(YEAR_MONTH FROM startday))

FROM contract WHERE id = @id)+1);

-- 创建期间记录

SET @sql1 = REPEAT(" select 1 as tid union all", @cnt);

SET @sql1 = LEFT(@sql1, LENGTH(@sql1)-LENGTH(" union all"));

-- 拼接sql

SET @sql2 = CONCAT("select DATE_FORMAT(DATE_ADD(startday,

interval @i:=@i+1 MONTH), '%Y-%m')AS yrmh,

t1.id, t1.startday, t1.endday

FROM contract AS t1

INNER JOIN(",@sql1,") AS t2

WHERE t1.id ='", @id, "'");

SET @sql3 = CONCAT("

SELECT tt1.id, tt1.startday, tt1.endday, tt1.yrmh,

IFNULL(tt2.money,0) AS money FROM

(", @sql2,")as tt1

LEFT JOIN finance AS tt2

ON tt1.id = tt2.contract_id

and tt1.yrmh = DATE_FORMAT(tt2.targetmonth, '%Y-%m')

order by tt1.yrmh ");

PREPARE stmt FROM @sql3;

EXECUTE stmt;

END$$

-- 存储过程调用：

CALL p_contract(1)