假设我有 2 张桌子:
DROP TABLE IF EXISTS `datasetCalculation`;
DROP TABLE IF EXISTS `dataset`;
CREATE TABLE IF NOT EXISTS `dataset`(
`datasetID` INT NOT NULL AUTO_INCREMENT,
`datasetWeekOf` DATE, #date indicates the beginning of a week
`dataInsertedByID` INT NOT NULL,
`datasetItem1` INT,
`datasetItem2` INT,
`datasetItem3` INT,
PRIMARY KEY (`datasetID`, `datasetWeekOf`)
)Engine = InnoDB;
CREATE TABLE IF NOT EXISTS `datasetCalculation`(
`datasetID` INT NOT NULL,
`datasetWeekOf` DATE,
`datasetItemSum` INT,
PRIMARY KEY (`datasetID`, `datasetWeekOf`),
CONSTRAINT `datasetID_FK`
FOREIGN KEY (`datasetID`)
REFERENCES `dataset` (`datasetID`)
ON UPDATE CASCADE
ON DELETE CASCADE,
CONSTRAINT `datasetWeekOf_FK`
FOREIGN KEY (`datasetID`)
REFERENCES `dataset` (`datasetID`)
ON UPDATE CASCADE
ON DELETE CASCADE
) Engine = InnoDB;
我想做的是什么时候dataset
用下周的信息更新(每周更新一次),自动将相关信息插入到datasetCalculation
. 等效的方法是用某种语言(比方说 php)计算 的总和datasetItem(1-3)
,然后将其插入 datasetCalculation
. datasetItemSum
以及其他相关信息。相反,我希望这由数据库自动完成。