update table_xxx set a=a+1 where documentid=123
如果数据库中为10 那么 执行后就是11
但是最后结果总是12 ,我都郁闷了一天了,怎么办。程序没有任何问题,我用mysql类,和原生的sql都试过了,都这这个问题,以前开发的时候也没有遇到,开发一年遇到这样的问题有解决不了,感觉就是一饭桶,求大神指教
数据库结构:
<code>CREATE TABLE comment_top_foot ( id int(10) NOT NULL AUTO_INCREMENT, documentid int(10) NOT NULL, commentid int(10) NOT NULL, topnum int(10) NOT NULL DEFAULT '0' COMMENT '对评论顶的数量', footnum int(10) NOT NULL DEFAULT '0' COMMENT '对评论踩的数量', PRIMARY KEY (id) ) ENGINE=MyISAM AUTO_INCREMENT=1500 DEFAULT CHARSET=latin1 </code>
刚才我在linux下运行脚本了,数据库中是加一的没错,但是我在浏览器访问这个脚本后数据库值加2 的,这是神马原因!
找到原因了,在同事那里用浏览器是正常的,我换成火狐或者ie也是正常的,现在用的是谷歌的,出问题了,唯一纳闷的是为什么谷歌浏览器会出问题。郁闷。。。
回复内容:
update table_xxx set a=a+1 where documentid=123
如果数据库中为10 那么 执行后就是11
但是最后结果总是12 ,我都郁闷了一天了,怎么办。程序没有任何问题,我用mysql类,和原生的sql都试过了,都这这个问题,以前开发的时候也没有遇到,开发一年遇到这样的问题有解决不了,感觉就是一饭桶,求大神指教
数据库结构:
<code>CREATE TABLE comment_top_foot ( id int(10) NOT NULL AUTO_INCREMENT, documentid int(10) NOT NULL, commentid int(10) NOT NULL, topnum int(10) NOT NULL DEFAULT '0' COMMENT '对评论顶的数量', footnum int(10) NOT NULL DEFAULT '0' COMMENT '对评论踩的数量', PRIMARY KEY (id) ) ENGINE=MyISAM AUTO_INCREMENT=1500 DEFAULT CHARSET=latin1 </code>
刚才我在linux下运行脚本了,数据库中是加一的没错,但是我在浏览器访问这个脚本后数据库值加2 的,这是神马原因!
找到原因了,在同事那里用浏览器是正常的,我换成火狐或者ie也是正常的,现在用的是谷歌的,出问题了,唯一纳闷的是为什么谷歌浏览器会出问题。郁闷。。。
考虑下,你防重复提交逻辑做了没有?
抓一下http请求,看看发了几个请求过去了。
http://stackoverflow.com/questions/19264616/mysql-update-query-is-executing-twice-in-chrome-but-once-in-mozilla
https://codebuildplay.wordpress.com/2014/03/06/chrome-loads-page-twice-sitecore-dms-gets-faulty-usage-data/
能把代码贴上来么, 我在本地的测试正确的, 我是在mysql 命令行 里面敲的
<code>update ask_posts set state=state+1 where id=10; </code>
得到的结果:
你应该把PHP代码贴出来,问题很可能是在那

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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