Spring GRAILS-GORM：保存新对象时出现DuplicateKeyException

我使用GORM从excel文件中备份数据库中的事件

new ExcelBuilder(excelFile.inputStream).eachLine([labels: true, sheet: 0]) {
                if (cell(0)) {
                    def nameA = cell(0)
                    def nameB = cell(1)
                    def a = Chapitre.findByNom(nameA)

                def code = cell(2)
                def designation = cell(3)

                if (code == null || nameA == null || nameB == null) {
                    flash.messages << "error"
                } else if (!Chapitre.findByNom(nameA)) {
                    flash.messages << "error"
                } else if ( Rubrique.where{nom == nameB && chapitre == a}.list().size() == 0) {
                    flash.messages << "error"
                } else if(Object.where{rubrique == Rubrique.findByNom(nameB) && c == code && d == designation}.count() > 0){
                    flash.messages << "error"
                } else {

                        def b = Rubrique.findByNom(nameB)
                        def isNew = false;

                        Object.withNewSession {session2->
                            def object = Object.findOrCreateByCode(code)

                            if(object.designation == null)
                                isNew = true;

                            object.rubrique = b
                            object.d= (designation == null)?"":designation
//                              try {
                                    rowCount += object.save()? 1 : 0
//                              } catch(ValidationException) {
//                                    if(isNew)
//                                        rowCount++;
//                                    log.info("ErreuRRRRRRRRrrrRRrrRrRRrrrrRrrrRrrrRrrrr")
//                              }
                            }
                    }
                }
                currentLine++
}
flash.messages << "${rowCount} ligne create or update"

有问题的对象的注册是有效的，但该错误在文件路径之外引发

当我取消对try-and-catch的注释时，我绕过了错误，因此在数据库中创建了每个文件的所有副本

---

因此，我找到了一种解决我的担忧的方法，但我觉得它不是很清晰，我来找你们，试图了解我的问题。

没有进一步的信息，很难给出任何明确的答案。这段代码是否返回到服务中？非常怀疑，因为它有flash.message指向控制器执行所有操作。试着把它变成一个服务和事务性的，然后也许你可以考虑用newtransaction调用删除它

您可以阅读有关此处创建的错误的更多信息： 审查意见： 当您手动初始化一个具有id或唯一属性的类new ClassD时，当会话中已经存在另一个类时，就会出现这个问题。因此，您应该首先尝试获取该实体findOrCreateWhere就是这样做的，但是如果您使用id，则需要使用get，然后使用找到的实例或为更新创建一个新实例

您整理了代码并从服务运行：问题可能会消失，因为我也清理了您正在执行的重复查找：

class TestService {

    static transactional=true

    def saveRecord()  {
        def results=[]
        new ExcelBuilder(excelFile.inputStream).eachLine([labels: true, sheet: 0]) {
            if (cell(0)) {
                def nameA = cell(0)
                def nameB = cell(1)
                def code = cell(2)
                def designation = cell(3)

                def a = Chapitre.findByNom(nameA)
                def b = Rubrique.where{nom == nameB && chapitre == a}
                def c = Object.where{rubrique == b && c == code && d == designation}

                if (!code||!nameA||!nameB||!a||!b||!c) {
                    results << "Error saving ${nameA} ${nameB} ${code}"
                } else {
                    //boolean isNew = false
                    def object = Object.findOrSaveWhere(code:code)
                    if(object) { 
                        if (!object.designation) {
                            rowCount++
                            results << "Record ${object} has no designation ? new Record?"
                        }
                        object.rubrique = b
                        object.d = designation ?: ''
                        object.save()
                        results << "Record ${object.id} is saved"
                    } else {
                        /*
                         *  Could not save or find code:code now create a new object:
                         *  object = new Object(code:code, rubrique:rubrique: d: designation ?: '').save()
                         *  
                         */
                    }   
                }
            }
            currentLine++
        }
        results <<  "${rowCount} ligne create or update"
        return results
    }
}

class TestService {

    static transactional=true

    def saveRecord()  {
        def results=[]
        new ExcelBuilder(excelFile.inputStream).eachLine([labels: true, sheet: 0]) {
            if (cell(0)) {
                def nameA = cell(0)
                def nameB = cell(1)
                def code = cell(2)
                def designation = cell(3)

                def a = Chapitre.findByNom(nameA)
                def b = Rubrique.where{nom == nameB && chapitre == a}
                def c = Object.where{rubrique == b && c == code && d == designation}

                if (!code||!nameA||!nameB||!a||!b||!c) {
                    results << "Error saving ${nameA} ${nameB} ${code}"
                } else {
                    //boolean isNew = false
                    def object = Object.findOrSaveWhere(code:code)
                    if(object) { 
                        if (!object.designation) {
                            rowCount++
                            results << "Record ${object} has no designation ? new Record?"
                        }
                        object.rubrique = b
                        object.d = designation ?: ''
                        object.save()
                        results << "Record ${object.id} is saved"
                    } else {
                        /*
                         *  Could not save or find code:code now create a new object:
                         *  object = new Object(code:code, rubrique:rubrique: d: designation ?: '').save()
                         *  
                         */
                    }   
                }
            }
            currentLine++
        }
        results <<  "${rowCount} ligne create or update"
        return results
    }
}