Mysql说：＃1422 - 存储函数或触发器中不允许显式或隐式提交

Question

在下面的代码中，我试图创建一个插入＆＃39; incidentimg＆＃39;如果网络应用程序的用户没有上传具有属于＆＃39; incidentreport＆＃39;的表单的图像，则表ID和图像路径但是，我只得到错误＆＃34; MySQL说：＃1422 - 存储函数或触发器中不允许显式或隐式提交＆＃34;

DROP TRIGGER IF EXISTS `insertImage`;
CREATE TRIGGER `insertImage` AFTER INSERT ON `incidentreport` 
FOR EACH ROW 
BEGIN 
    IF(SELECT incidentimg.incidentImgId FROM incidentimg 
       LEFT JOIN incidentreport ON incidentimg.imgs_incidentReportId = incidentreport.incidentReportId 
       WHERE incidentimg.incidentImgId IS NULL) 
       THEN INSERT INTO incidentimg(incidentImgId, imgUrl)values(NEW.incidentReportId, 'images/no-image.png'); 
    END IF; 
END
;

以下是正在使用的表格

有人可以帮我解决这个问题吗

Answer 1

我终于让代码工作了。现在代码将检查'incidentimg'表是否具有'incidentreport'表所具有的所有'incidentReportId'，如果没有，则将插入'incidentreport'表中最后插入的id以及默认图像路径进入'incidentimg'表后插入。

CREATE TRIGGER insertImage AFTER INSERT ON incidentreport
FOR EACH ROW    
BEGIN
    IF(SELECT incidentreport.incidentReportId 
        FROM incidentreport
        LEFT JOIN incidentimg ON incidentreport.incidentReportId = incidentimg.imgs_incidentReportId
        WHERE incidentimg.imgs_incidentReportId IS NULL)
        THEN INSERT INTO incidentimg(imgs_incidentReportId, imgUrl) VALUES(NEW.incidentReportId, 'images/no-image.png');
    END IF;
END

Answer 2

我不太确定，但我猜这可能是因为IF .. THEN条件INSERT。尝试使用INSERT之类的<{p>}修改EXISTS语句

DROP TRIGGER IF EXISTS `insertImage`;
CREATE TRIGGER `insertImage` AFTER INSERT ON `incidentreport` 
FOR EACH ROW 
BEGIN 
INSERT INTO incidentimg(incidentImgId, imgUrl)
SELECT NEW.incidentReportId, 'images/no-image.png'
FROM DUAL WHERE EXISTS (
SELECT 1 FROM incidentimg 
       LEFT JOIN incidentreport 
ON incidentimg.imgs_incidentReportId = incidentreport.incidentReportId 
WHERE incidentimg.incidentImgId IS NULL
)  
END;