1. Jakarta NoSQL Template 概述1.1 Jakarta NoSQL 项目简介标准化NoSQL访问：为Java开发者提供统一的NoSQL数据库访问API多模型支持：支持文档、列式、键值、图形等多种NoSQL数据模型轻量级框架：基于注解驱动的编程模型，简化开发1.2 Template 模块的核心作用模板模式实现：提供通用的数据访问模板统一API：屏蔽底层数据库差异资源管理：自动管理数据库连接和事务1.3 与其他 NoSQL 框架的对比与Spring Data对比：更轻量级，专注于Jakarta EE生态与原生驱动对比：提供更高层次的抽象与JPA对比：专为NoSQL设计，支持灵活schema1.4 适用场景分析微服务架构：轻量级数据访问层多数据库支持：统一API访问不同NoSQL数据库快速开发：减少样板代码2. 核心架构与设计原理2.1 Template 模式的架构设计publicinterfaceTemplate{// 统一的模板接口设计TTinsert(Tentity);TTupdate(Tentity);Tvoiddelete(Tentity);TOptionalTfind(ClassTtype,Objectid);}2.2DocumentTemplate接口详解publicinterfaceDocumentTemplateextendsAutoCloseable{/** * 保存文档 */TTinsert(Tentity);/** * 更新文档 */TTupdate(Tentity);/** * 删除文档 */Tvoiddelete(EntityDeleteQueryquery);/** * 查询文档 */TStreamTselect(DocumentQueryquery);/** * 获取文档集合管理器 */DocumentCollectionManagergetDocumentCollectionManager();}2.3ColumnTemplate接口详解publicinterfaceColumnTemplateextendsAutoCloseable{/** * 保存列族数据 */TTinsert(Tentity);/** * 更新列族数据 */TTupdate(Tentity);/** * 查询列族数据 */TStreamTselect(ColumnQueryquery);/** * 获取列族管理器 */ColumnFamilyManagergetColumnFamilyManager();}2.4KeyValueTemplate接口详解publicinterfaceKeyValueTemplateextendsAutoCloseable{/** * 存储键值对 */K,Vvoidput(Kkey,Vvalue);/** * 存储键值对并设置TTL */K,Vvoidput(Kkey,Vvalue,Durationttl);/** * 获取键值对 */VOptionalVget(Objectkey,ClassVtype);/** * 删除键值对 */voiddelete(Object...keys);/** * 获取桶管理器 */BucketManagergetBucketManager();}2.5GraphTemplate接口详解publicinterfaceGraphTemplateextendsAutoCloseable{/** * 创建顶点 */Vertexpersist(Vertexvertex);/** * 创建边 */Edgepersist(Edgeedge);/** * 查找顶点 */ListVertexgetVertices(Stringlabel,StringpropertyKey,Objectvalue);/** * 查找边 */ListEdgegetEdges(Stringlabel,StringpropertyKey,Objectvalue);/** * 执行Gremlin查询 */TStreamTquery(Stringgremlin,MapString,Objectparameters);}3. 文档数据库模板 (DocumentTemplate)3.1 基本操作：插入、查询、更新、删除@EntitypublicclassUser{@IdprivateStringid;@ColumnprivateStringname;@ColumnprivateStringemail;// 构造函数、getter、setter省略}@ServicepublicclassUserService{@InjectprivateDocumentTemplatetemplate;/** * 插入用户 */publicUserinsertUser(Useruser){returntemplate.insert(user);}/** * 查询用户 */publicOptionalUserfindUserById(Stringid){DocumentQueryquery=DocumentQuery.select().from("User").where("id").eq(id).build();returntemplate.select(query).findFirst().map(u-(User)u);}/** * 更新用户 */publicUserupdateUser(Useruser){returntemplate.update(user);}/** * 删除用户 */publicvoiddeleteUser(Stringid){EntityDeleteQuerydeleteQuery=EntityDeleteQuery.delete().from("User").where("id").eq(id).build();template.delete(deleteQuery);}}3.2DocumentQuery查询构建器publicclassDocumentQueryExample{@InjectprivateDocumentTemplatetemplate;/** * 复杂查询示例 */publicListUserfindUsersWithConditions(){// 构建复杂查询DocumentQueryquery=DocumentQuery.select().from("User").where("name").like("%john%").and("age").gt(18).and("status").eq("active").orderBy("name",SortType.ASC).limit(10).skip(0).build();returntemplate.select(query).map(u-(User)u).collect(Collectors.toList());}/** * 范围查询 */publicListUserfindUsersByAgeRange(intminAge,intmaxAge){DocumentQueryquery=DocumentQuery.select().from("User").where("age").between(minAge,maxAge).build();returntemplate.select(query).map(u-(User)u).collect(Collectors.toList());}/** * 数组查询 */publicListUserfindUsersByTags(ListStringtags){DocumentQueryquery=DocumentQuery.select().from("User").where("tags").in(tags).build();returntemplate.select(query).map(u-(User)u).collect(Collectors.toList());}}3.3 批量操作处理publicclassBatchOperationService{@InjectprivateDocumentTemplatetemplate;/** * 批量插入 */publicListUserbatchInsert(ListUserusers){returnusers.stream().map(template::insert).collect(Collectors.toList());}/** * 批量更新 */publicListUserbatchUpdate(ListUserusers){returnusers.stream().map(template::update).collect(Collectors.toList());}/** * 批量删除 */publicvoidbatchDelete(ListStringuserIds){for(Stringid:userIds){EntityDeleteQuerydeleteQuery=EntityDeleteQuery.delete().from("User").where("id").eq(id).build();template.delete(deleteQuery);}}/** * 批量查询 */publicListUserbatchFind(ListStringuserIds){if(userIds.isEmpty()){returnCollections.emptyList();}StringBuilderqueryBuilder=newStringBuilder();queryBuilder.append("SELECT * FROM User WHERE id IN (");for(inti=0;iuserIds.size();i++){if(i0)queryBuilder.append(",");queryBuilder.append("'").append(userIds.get(i)).append("'");}queryBuilder.append(")");DocumentQueryquery=DocumentQuery.nativeQuery(queryBuilder.toString());returntemplate.select(query).map(u-(User)u).collect(Collectors.toList());}}3.4 事务支持与一致性保证@ServicepublicclassTransactionalUserService{@InjectprivateDocumentTemplatetemplate;@TransactionalpublicUsercreateUserWithProfile(Useruser,Profileprofile){// 保存用户UsersavedUser=template.insert(user);// 设置profile关联profile.setUserId(savedUser.getId());// 保存profileProfilesavedProfile=template.insert(profile);returnsavedUser;}@Transactional(rollbackFor=Exception.class)publicvoidupdateUserWithValidation(StringuserId,UserupdatedUser){// 检查用户是否存在OptionalUserexistingUser=findUserById(userId);if(!existingUser.isPresent()){thrownewUserNotFoundException("User not found: "+userId);}// 验证更新数据validateUserData(updatedUser);// 执行更新template.update(updatedUser);// 记录审计日志logUserUpdate(userId,updatedUser);}privatevoidvalidateUserData(Useruser){if(user.getEmail()==null||!isValidEmail(user.getEmail())){thrownewValidationException("Invalid email format");}}privatebooleanisValidEmail(Stringemail){returnemail!=nullemail.matches("^[A-Za-z0-9+_.-]+@([A-Za-z0-9.-]+\\.[A-Za-z]{2,})$");}privatevoidlogUserUpdate(