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我正在使用 Grails 2.3.5，并且我有一个包含ajaxDelete方法的控制器。此方法接收名称作为我要删除的实体的字符串。我正在使用一项服务来删除我从控制器中调用的实体。

第一次调用服务deleteSvnUser方法时，SVN 用户被删除，并且我在页面上的 div 更新，并显示用户已被删除的警报。第二次删除用户时，出现以下错误： 

row-was-updated-or-deleted-by-another-transaction-or-unsaved-value-mapping-was...

我已经尝试了几件事来解决这个问题：

  • 将@transactional 注释添加到我的服务中（我不应该这样做，因为它应该是默认的事务性的）。
  • 刷新我的删除（刷新：真）
  • 在我删除实体之前刷新它（.refresh）
  • 检索实体时锁定实体 (entity.lock(id))

以上都没有奏效。我不确定还能做些什么来解决这个问题。任何人都可以帮忙吗？我的代码如下：

控制器

class SvnUserController {

def svnUserService  

def ajaxDelete() {

    if (!params.selectedSvnUser) {
        request.error = "The selected Svn User does not exist"
        render(template:"svnUserList", model:[svnUserInstanceList: SvnUser.list(params).sort{it.name}, svnUserInstanceTotal: SvnUser.count()])              
        return
    }

        String outcome = svnUserService.deleteSvnUser(params.selectedSvnUser)

        switch (outcome){

            case "":
                request.message = "Svn User ${params.selectedSvnUser} deleted"
                break

            default: request.error = outcome
        }

    }        

    def svnUsers =  svnUserService.getAllSvnUsers(params)
    render(template:"svnUserList", model:[svnUserInstanceList: svnUsers, svnUserInstanceTotal: svnUsers.size()])
    return
}
}

服务

class SvnUserService {

 public String deleteSvnUser(String userName) {

    String outcome = ""

    try {

        SvnUser svnUserInstance = SvnUser.findByName(userName)
        def groups = SvnGroupController.findAllBySvnUserName(userName)

        groups.each { SvnGroup group ->

            group.removeFromSvnUsers(svnUserInstance)
            group.save()
        }

        def userPermissionsList = UserPermission.findAllBySvnUser(svnUserInstance)

        userPermissionsList.each {
            def repoDirectory = it.repositoryDirectory
            repoDirectory.removeFromUserPermissions(it)
            it.delete()
        }

        svnUserInstance.merge()
        svnUserInstance.delete()            
    }
    catch (DataIntegrityViolationException e) {
        outcome = "A error occurred while attempting to delete the Svn User from file."
    }


    return outcome
}

}

堆栈跟踪如下：

Error |
2014-06-10 15:10:07,394 [http-bio-8080-exec-6] ERROR errors.GrailsExceptionResolver  -     StaleObjectStateException occurred when processing request: [POST]  /subzero/svnUser/ajaxDelete - parameters:
selectedSvnUser: ruby2
Row was updated or deleted by another transaction (or unsaved-value mapping was  incorrect): [com.uk.nmi.subzero.SvnGroup#2]. Stacktrace follows:
Message: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.uk.nmi.subzero.SvnGroup#2]
Line | Method
->>   72 | deleteSvnUser in com.uk.nmi.subzero.SvnUserService
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
|     87 | ajaxDelete    in com.uk.nmi.subzero.SvnUserController
|    200 | doFilter . .  in grails.plugin.cache.web.filter.PageFragmentCachingFilter
|     63 | doFilter      in grails.plugin.cache.web.filter.AbstractFilter
|   1145 | runWorker . . in java.util.concurrent.ThreadPoolExecutor
|    615 | run           in java.util.concurrent.ThreadPoolExecutor$Worker
^    744 | run . . . . . in java.lang.Thread
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1 回答 1

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我看不出你的代码有任何问题。Grails 应该可以很好地处理事务。

如果您的对象映射设置正确，svnUserInstance.delete()调用也应该删除子对象，所以我认为您甚至不需要svnUserInstance = SvnUser.findByName(userName)删除和删除之间的线。

你怎么称呼ajaxDelete？有没有可能第二次被错误地调用？

于 2014-06-11T09:55:39.643 回答