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我想做的是:
当我输入这个触发器时:
CREATE TRIGGER `Trigger1` AFTER INSERT ON `def_servpath_0001_weatherstation`
FOR EACH
ROW UPDATE def_servpath_0001_weatherstation AS t1 LEFT JOIN (
SELECT *
FROM def_servpath_0001_weatherstation
GROUP BY recvTimeTs, entityId
) AS t2 ON t1.recvTime = t2.recvTime
SET t1.attrMd = t2.attrValue WHERE t2.attrValue = time
触发器没有按照我的意愿进行。我做了一些研究,发现如果触发器内部有更新,它就会陷入递归循环。
我希望我的最终结果是在每次更新数据库之后创建一个触发器,该触发器将:
这是该表的转储:
-- phpMyAdmin SQL Dump
-- version 4.0.10.9
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Sep 01, 2015 at 10:07 AM
-- Server version: 5.1.73
-- PHP Version: 5.3.3
SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";
/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;
--
-- Database: `def_serv`
--
-- --------------------------------------------------------
--
-- Table structure for table `def_servpath_0001_weatherstation`
--
CREATE TABLE IF NOT EXISTS `def_servpath_0001_weatherstation` (
`recvTimeTs` mediumtext,
`recvTime` text,
`entityId` text,
`entityType` text,
`attrName` text,
`attrType` text,
`attrValue` text,
`attrMd` text
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
--
-- Dumping data for table `def_servpath_0001_weatherstation`
--
INSERT INTO `def_servpath_0001_weatherstation` (`recvTimeTs`, `recvTime`, `entityId`, `entityType`, `attrName`, `attrType`, `attrValue`, `attrMd`) VALUES
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'time', 'datetime', '6:30:0,1.9.2015', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'at', 'double', '18.799', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'ah', 'double', '91.0', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'ws', 'double', '0.01', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'wd', 'int', '270', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'sr', 'double', '17.181', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'sm1', 'double', '24.683', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'sp', 'double', '17.181', '[]'),
('1441083706', '2015-09-01T07:01:46.104', '0001', 'WeatherStation', 'bt', 'double', '6.552', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'time', 'datetime', '6:45:0,1.9.2015', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'at', 'double', '18.799', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'ah', 'double', '91.0', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'ws', 'double', '0.0', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'wd', 'int', '270', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'sr', 'double', '17.898', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'sm1', 'double', '24.683', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'sp', 'double', '17.898', '[]'),
('1441083713', '2015-09-01T07:01:53.549', '0001', 'WeatherStation', 'bt', 'double', '6.591', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'time', 'datetime', '7:0:0,1.9.2015', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'at', 'double', '19.400', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'ah', 'double', '91.0', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'ws', 'double', '0.0', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'wd', 'int', '270', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'sr', 'double', '18.488', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'sm1', 'double', '24.683', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'sp', 'double', '18.488', '[]'),
('1441083720', '2015-09-01T07:02:00.951', '0001', 'WeatherStation', 'bt', 'double', '6.640', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'time', 'datetime', '7:15:0,1.9.2015', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'at', 'double', '19.400', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'ah', 'double', '91.0', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'ws', 'double', '0.59', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'wd', 'int', '236', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'sr', 'double', '18.801', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'sm1', 'double', '24.386', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'sp', 'double', '18.801', '[]'),
('1441087323', '2015-09-01T08:02:03.349', '0001', 'WeatherStation', 'bt', 'double', '6.689', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'time', 'datetime', '7:30:0,1.9.2015', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'at', 'double', '20.0', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'ah', 'double', '90.0', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'ws', 'double', '0.35', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'wd', 'int', '290', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'sr', 'double', '18.894', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'sm1', 'double', '24.683', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'sp', 'double', '18.894', '[]'),
('1441087330', '2015-09-01T08:02:10.383', '0001', 'WeatherStation', 'bt', 'double', '6.757', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'time', 'datetime', '7:45:0,1.9.2015', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'at', 'double', '20.5', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'ah', 'double', '90.0', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'ws', 'double', '0.37', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'wd', 'int', '322', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'sr', 'double', '19.298', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'sm1', 'double', '24.683', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'sp', 'double', '19.298', '[]'),
('1441087338', '2015-09-01T08:02:18.889', '0001', 'WeatherStation', 'bt', 'double', '6.865', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'time', 'datetime', '8:0:0,1.9.2015', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'at', 'double', '21.099', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'ah', 'double', '88.0', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'ws', 'double', '0.35', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'wd', 'int', '290', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'sr', 'double', '19.391', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'sm1', 'double', '24.386', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'sp', 'double', '19.391', '[]'),
('1441087346', '2015-09-01T08:02:26.037', '0001', 'WeatherStation', 'bt', 'double', '6.923', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'time', 'datetime', '8:15:0,1.9.2015', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'at', 'double', '21.599', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'ah', 'double', '85.0', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'ws', 'double', '0.52', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'wd', 'int', '282', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'sr', 'double', '19.548', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'sm1', 'double', '24.386', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'sp', 'double', '19.548', '[]'),
('1441090890', '2015-09-01T09:01:30.186', '0001', 'WeatherStation', 'bt', 'double', '6.962', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'time', 'datetime', '8:30:0,1.9.2015', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'at', 'double', '22.200', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'ah', 'double', '84.0', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'ws', 'double', '0.98', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'wd', 'int', '58', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'sr', 'double', '19.796', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'sm1', 'double', '24.386', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'sp', 'double', '19.796', '[]'),
('1441090898', '2015-09-01T09:01:38.072', '0001', 'WeatherStation', 'bt', 'double', '7.011', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'time', 'datetime', '8:45:0,1.9.2015', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'at', 'double', '23.299', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'ah', 'double', '80.0', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'ws', 'double', '0.27', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'wd', 'int', '242', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'sr', 'double', '19.796', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'sm1', 'double', '24.386', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'sp', 'double', '19.796', '[]'),
('1441090905', '2015-09-01T09:01:45.32', '0001', 'WeatherStation', 'bt', 'double', '7.118', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'time', 'datetime', '9:0:0,1.9.2015', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'at', 'double', '24.400', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'ah', 'double', '77.0', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'ws', 'double', '0.22', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'wd', 'int', '270', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'sr', 'double', '20.138', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'sm1', 'double', '24.386', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'sp', 'double', '20.138', '[]'),
('1441090913', '2015-09-01T09:01:53.36', '0001', 'WeatherStation', 'bt', 'double', '7.060', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'time', 'datetime', '9:15:0,1.9.2015', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'at', 'double', '25.5', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'ah', 'double', '68.0', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'ws', 'double', '0.65', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'wd', 'int', '280', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'pp', 'double', '0.0', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'sr', 'double', '20.170', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'sm1', 'double', '24.386', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'lw1', 'double', '0.0', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'sp', 'double', '20.170', '[]'),
('1441094510', '2015-09-01T10:01:50.44', '0001', 'WeatherStation', 'bt', 'double', '7.050', '[]');
最佳答案
据我了解,您的插入/更新 block 只有一行
通过这种方式,您可以在插入/更新之前更新所有行值,而不是多个触发器
使用 NEW
对象(也有一个 OLD
对象用于更新)
CREATE TRIGGER upd_check BEFORE INSERT ON def_servpath_0001_weatherstation
BEGIN
DECLARE someString varchar(100);
FOR EACH ROW
BEGIN
IF NEW.atrType = 'datetime' THEN
SET @someString := NEW.atrValue;
END IF;
END;
FOR EACH ROW
BEGIN
IF NEW.atrType <> 'datetime' THEN
SET NEW.atrMD = someString;
END IF;
END;
END;//
关于mysql - 如何创建一个触发器,将相邻行中一列的数据更新 10 次?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/32355859/
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我重新访问了我的数据库并注意到我有一些 INT 类型的主键。 这还不够独特,所以我想我会有一个指导。 我来自微软 sql 背景,在 ssms 中你可以 选择类型为“uniqeidentifier”并自
我的系统上有 MySQL,我正在尝试确定它是 Oracle MySQL 还是 MySQL。 Oracle MySQL 有区别吗: http://www.oracle.com/us/products/m
我是在生产 MySQL 中运行的应用程序的新维护者。之前的维护者已经离开,留下的文档很少,而且联系不上了。 我面临的问题是执行以下请求大约需要 10 秒: SELECT COUNT(*) FROM `
我有两个位于不同机器上的 MySQL 数据库。我想自动将数据从一台服务器传输到另一台服务器。比方说,我希望每天早上 4:00 进行数据传输。 可以吗?是否有任何 MySQL 内置功能可以让我们做到这一
有什么方法可以使用 jdbc 查询位于 mysql 根目录之外的目录中的 mysql 表,还是必须将它们移动到 mysql 根目录内的数据库文件夹中?我在 Google 上搜索时没有找到任何东西。 最
我在 mysql 数据库中有两个表。成员和 ClassNumbers。两个表都有一个付费年份字段,都有一个代码字段。我想用代码数字表中的值更新成员表中的付费年份,其中成员中的代码与 ClassNumb
情况:我有 2 台服务器,其中一台当前托管一个实时 WordPress 站点,我希望能够将该站点转移到另一台服务器,以防第一台服务器出现故障。传输源文件很容易;传输数据库是我需要弄清楚如何做的。两台服
Phpmyadmin 有一个功能是“复制数据库到”..有没有mysql查询来写这个函数?类似于将 db A 复制到新的 db B。 最佳答案 首先创建复制数据库: CREATE DATABASE du
我有一个使用 mySQL 作为后端的库存软件。我已经在我的计算机上对其进行了测试,并且运行良好。 当我在计算机上安装我的软件时,我必须执行以下步骤: 安装 mySQL 服务器 将用户名指定为“root
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