：多用户同时访问时的问题？
请各位大牛不吝指教，先谢过去了！
情况描述如下：
系统结构：1. 界面模块(php) -->2. 中间接口(php) --> 3. 数据库(mysql)
1. 界面模块：显示操作界面及操作结果；
2. 中间接口：负责界面模块和数据库之间的数据交换，及其他功能（跟求助问题无关，不加以描述）；
大致流程：从界面模块发送http请求，该请求发送给接口模块，接口模块访问数据库获得数据，返回给界面模块；
问题来了：
界面模块有大量访问用户，这些用户可能同时发送同样的请求给接口，比如：同时编辑某一数据。
问：如何才能避免这种问题？
不知道有没描述清楚，请各大牛赐教，谢谢！
回复讨论(解决方案)
加锁
若业务上允许“同时编辑某一数据”，则以最后提交的为准
否则在收到请求时返回 xxx正在编辑
谢谢斑竹的指教！能详细点吗？合作方要求只能在界面模块进行限制同时编辑某一数据。
在用户A编辑某条新闻读取成功时，将这条数据的状态字段设为1，记录读取的时间戳
此时再有人想编辑，状态1就拒绝
用户A的页面ajax轮询，每隔几十秒告诉服务器还在编辑并刷新时间
当A编辑提交，或用户B想编辑状态为1，但是最后一次ajax提交的时间和当前差太多，就设置状态为0
在用户A编辑某条新闻读取成功时，将这条数据的状态字段设为1，记录读取的时间戳
此时再有人想编辑，状态1就拒绝
用户A的页面ajax轮询，每隔几十秒告诉服务器还在编辑并刷新时间
当A编辑提交，或用户B想编辑状态为1，但是最后一次ajax提交的时间和当前差太多，就设置状态为0
谢谢您的回复，我有些疑惑在界面模块可以这样做吗？我曾讨教过一位做了多年php的朋友，他告诉我这没法整。
之前我也想过设置标识，因为无法操作数据库，所以放弃了。
编辑的时候不需要权限么？A发的B也可以编辑么？
编辑的时候不需要权限么？A发的B也可以编辑么？
谢谢您的到来！
编辑的时候需要权限，但可以在线多个有权限的用户进行编辑某一条数据。
不允许同时编辑同一条记录，是业务层面的需求
业务需求的实现，应在 中间接口 中完成。如有特殊需求，也可在 界面模块 完成
你的这个需求还是应在 中间接口 中完成的
不允许同时编辑同一条记录，是业务层面的需求
业务需求的实现，应在 中间接口 中完成。如有特殊需求，也可在 界面模块 完成
你的这个需求还是应在 中间接口 中完成的
感谢版主的再次指教！谢谢“xuzuning”版主！
我描述的还不够细致，重新描述下业务逻辑：
界面层的功能包括：数据显示，数据编辑请求，操作用户的管理等，且界面层有操作用户的数据库。
中间接口层：处理界面层的请求，无视操作用户，不管哪个操作用户的操作请求，中间接口层都视为合法。
我感觉版主您的意思是在中间接口层处理，然后不管谁发过来的请求，请求过来，标识锁定，返回结果后再标识解锁？
我之前也是这样认为的，因为第一次接触php, 对方是老手，所以不敢确定。
对方非得要我在界面层来处理该业务，说用ajax就可以， 但我觉得我无法去设标识，所以困惑，才有此问。
再次感谢版主的指教！
放在 中间层 比较合适
因为一般的说，中间层就是通常说的 API
加一个过滤条件比较简单
当然在界面层也可以实现，不过界面层不宜（不能）直接访问数据层。
所以要单独设置缓存机制，未处理完的就不再向中间层发请求
用一个共享内存或数据库或文件的队列就可以了
放在 中间层 比较合适
因为一般的说，中间层就是通常说的 API
加一个过滤条件比较简单
当然在界面层也可以实现，不过界面层不宜（不能）直接访问数据层。
所以要单独设置缓存机制，未处理完的就不再向中间层发请求
用一个共享内存或数据库或文件的队列就可以了
太感谢了，清晰很多了，谢谢！！！
结贴，呵呵。
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