如果在触发条件中存在条件，如何在MySQL表中插入记录

Question

BLUF：我想使用before insert触发器来防止插入无效数据，而是将该数据存储在另一个表中并带有错误消息以供稍后检查。

我有一张桌子，我的Raspberry Pi气象站正在记录天气数据。有时候由于各种原因它有硬件故障，当发生这种情况时，它会为特定的数据点返回-1000。

我试图写一个before insert触发器，它会阻止这些记录被写入其他有效数据的表中。这部分似乎工作。但我也想把这些错误的记录写到不同的表格中。在测试时，坏数据按预期被拒绝，但没有记录正在写入错误日志表。

这是我写的触发器：

DROP TRIGGER IF EXISTS wx_beforeInsert; 

SET @ERROR_MESSAGE = ''; 

DELIMITER $$ 
CREATE TRIGGER `wx_beforeInsert` BEFORE INSERT ON WEATHER_MEASUREMENT 
FOR EACH ROW BEGIN 
    IF (NEW.AMBIENT_TEMPERATURE = '-1000') THEN 
     SET @ERROR_MESSAGE = "Ambient tempurature invalid. Record rejected."; 
    ELSEIF (NEW.GROUND_TEMPERATURE = '-1000') THEN 
     SET @ERROR_MESSAGE = "Ground tempurature invalid. Record rejected."; 
    ELSEIF (NEW.AIR_QUALITY = '-1000') THEN 
     SET @ERROR_MESSAGE = "Air quality invalid. Record rejected."; 
    ELSEIF (NEW.AIR_PRESSURE = '-1000') THEN 
     SET @ERROR_MESSAGE = "Air pressure invalid. Record rejected."; 
    ELSEIF (NEW.HUMIDITY = '-1000') THEN 
     SET @ERROR_MESSAGE = "Humidity invalid. Record rejected."; 
    END IF; 

    IF (@ERROR_MESSAGE <> '') THEN 
     INSERT INTO `weather`.`WEATHER_MEASUREMENT_ERRORS` 
     (`AMBIENT_TEMPERATURE`, 
     `GROUND_TEMPERATURE`, 
     `AIR_QUALITY`, 
     `AIR_PRESSURE`, 
     `HUMIDITY`, 
     `WIND_DIRECTION`, 
     `WIND_SPEED`, 
     `WIND_GUST_SPEED`, 
     `RAINFALL`, 
     `CREATED`, 
     `ERROR_MESSAGE`) 
     VALUES 
     (NEW.AMBIENT_TEMPERATURE, 
     NEW.GROUND_TEMPERATURE, 
     NEW.AIR_QUALITY, 
     NEW.AIR_PRESSURE, 
     NEW.HUMIDITY, 
     NEW.WIND_DIRECTION, 
     NEW.WIND_SPEED, 
     NEW.WIND_GUST_SPEED, 
     NEW.RAINFALL, 
     NEW.CREATED, 
     @ERROR_MESSAGE); 

     SIGNAL SQLSTATE '45000' SET MESSAGE_TEXT = @ERROR_MESSAGE; 
    END IF; 
END; 
$$ 

下面是创建任何人支承台所需的脚本想尽力帮助谁：

CREATE DATABASE IF NOT EXISTS `weather` /*!40100 DEFAULT CHARACTER SET latin1 */; 
USE `weather`; 

-- Create the WEATHER_MEASUREMENT table if it doesn't exist 
CREATE TABLE IF NOT EXISTS `WEATHER_MEASUREMENT` (
    `ID` bigint(20) NOT NULL AUTO_INCREMENT, 
    `REMOTE_ID` bigint(20) DEFAULT NULL, 
    `AMBIENT_TEMPERATURE` decimal(6,2) NOT NULL, 
    `GROUND_TEMPERATURE` decimal(6,2) NOT NULL, 
    `AIR_QUALITY` decimal(6,2) NOT NULL, 
    `AIR_PRESSURE` decimal(6,2) NOT NULL, 
    `HUMIDITY` decimal(6,2) NOT NULL, 
    `WIND_DIRECTION` decimal(6,2) DEFAULT NULL, 
    `WIND_SPEED` decimal(6,2) NOT NULL, 
    `WIND_GUST_SPEED` decimal(6,2) NOT NULL, 
    `RAINFALL` decimal(6,4) DEFAULT NULL, 
    `CREATED` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, 
    PRIMARY KEY (`ID`) 
) ENGINE=InnoDB AUTO_INCREMENT=4126 DEFAULT CHARSET=latin1; 

CREATE TABLE IF NOT EXISTS `WEATHER_MEASUREMENT_ERRORS` (
    `ID` bigint(20) NOT NULL AUTO_INCREMENT, 
    `REMOTE_ID` bigint(20) DEFAULT NULL, 
    `AMBIENT_TEMPERATURE` decimal(6,2) NOT NULL, 
    `GROUND_TEMPERATURE` decimal(6,2) NOT NULL, 
    `AIR_QUALITY` decimal(6,2) NOT NULL, 
    `AIR_PRESSURE` decimal(6,2) NOT NULL, 
    `HUMIDITY` decimal(6,2) NOT NULL, 
    `WIND_DIRECTION` decimal(6,2) DEFAULT NULL, 
    `WIND_SPEED` decimal(6,2) NOT NULL, 
    `WIND_GUST_SPEED` decimal(6,2) NOT NULL, 
    `RAINFALL` decimal(6,4) DEFAULT NULL, 
    `CREATED` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, 
    `ERROR_MESSAGE` varchar(50) NOT NULL, 
    PRIMARY KEY (`ID`) 
) ENGINE=InnoDB AUTO_INCREMENT=4126 DEFAULT CHARSET=latin1; 

Answer 1

我觉得你插入在WEATHER_MEASUREMENT_ERRORS ia也回滚了。 尝试使WEATHER_MEASUREMENT_ERRORS非事务性（ROLLBACK不适用于非事务性表）成为MyISAM-Table。