Cascade="all-delete-orphan"以及java.util.ConcurrentModificationE
为以下两个问题提供解决：1. Hibernate cascade="all-delete-orphan"应用；
2. 用Collection or List 等集合时，迭代remove操作引起的java.util.ConcurrentModificationException问题
/** 修改業務系統 */public String updateBuinessSys() {modify = true;String transId = (String) getRequestMap().get("transId");if (StringUtil.isNullOrBlank(transId)) {context.addMessage(null, new FacesMessage("不能獲取業務系統對象"));return null;}Transaction transaction = transactionsManager.getTransactionById(transId);if (transaction != null) {transaction.setTransName(transName);transaction.setTransCode(transCode);transaction.setTransDesc(transDesc);transaction.setEnterpriseCodes(enterpriseCodes);transaction.setBankCodes(bankCodes);String transFuncXml = context.getExternalContext().getRequestParameterMap().get("transFuncXml");assembleTransFuncs(transFuncXml);Set<String> newFunIdSet = new HashSet<String>();//新增的列表id setSet<String> dbFunIdSet = new HashSet<String>();//DB中的列表id setList<TransFunction> funList = transaction.getTransFunctions();for (Iterator iterator = funList.iterator(); iterator.hasNext();) {TransFunction fun = (TransFunction) iterator.next();dbFunIdSet.add(fun.getId());}for (Iterator iterator = transFunList.iterator(); iterator.hasNext();) {TransFunction fun = (TransFunction) iterator.next();if (StringUtil.isNotNullOrBlank(fun.getId())) {newFunIdSet.add(fun.getId());}}/* 先remove,後add則不需要判斷fun.id為null的情況 */for (Iterator iterator = funList.iterator(); iterator.hasNext();) {TransFunction fun = (TransFunction) iterator.next();if (!newFunIdSet.contains(fun.getId()))//如果保存的list中的ID在DB中不存在了，即已經被刪除了，則remove from list，使之成為orphan//funList.remove(fun); 這一句會引起java.util.ConcurrentModificationExceptioniterator.remove();}for (Iterator iterator = transFunList.iterator(); iterator.hasNext();) {TransFunction fun = (TransFunction) iterator.next();if (StringUtil.isNullOrBlank(fun.getId()) || !dbFunIdSet.contains(fun.getId()))funList.add(fun);//新增的記錄在DB中沒有，則認為是新增的記錄，加入到list當中去}//transaction.setTransFunctions(transFunList); 不需要重新設置,設定了all-delete-orphan即可transactionsManager.saveOrUpdate(transaction);return "viewBusinessState";}context.addMessage(null, new FacesMessage("無效的表單參數"));return Constants.ERROR;}
Transaction - TransFunction是一对多的关系： hbm.xml配置档如下：
<?xml version="1.0"encoding='UTF-8'?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.test.domain"><class name="Transaction" table="SYS_TRANS"><id name="id" column="ID" length="32" type="string"><generator class="uuid" /></id><property name="transName" column="NAME" length="30" /><property name="transCode" column="CODE" length="10" unique="true" /><property name="transDesc" column="DESCR" length="200" /><property name="enterpriseCodes" column="ENTP_CODES" length="1000" /><property name="bankCodes" column="BANK_CODES" length="1000" /><bag name="transFunctions" cascade="all-delete-orphan" inverse="false" lazy="false"><key column="TRANS_ID" /><one-to-many class="TransFunction" /></bag></class></hibernate-mapping>
<?xml version="1.0"encoding='UTF-8'?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN""http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"><hibernate-mapping package="com.test.domain"><class name="TransFunction" table="SYS_TRANS_FUNC"><id name="id" column="ID" length="32" type="string"><generator class="uuid" /></id><property name="funcName" column="NAME" length="30" /><property name="funcCode" column="CODE" length="20" unique="true" /><many-to-one name="transaction" column="TRANS_ID"/></class></hibernate-mapping>
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