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最近项目持续改造，然后把SpringMVC换成了SpringWebflux，然后把Mybatis换成了R2dbc。中间没有遇到什么问题，一切都那么的美滋滋，直到最近一个新需求的出现，打破了往日的宁静。
上篇文章我们讲到了怎么在Spring webFlux中使用r2dbc,今天我们看一下怎么使用spring-data-r2dbc这个Spring data对r2dbc的封装来进行r2dbc操作。
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版本号： <version>2.6.10</version>， （本文基于已经会在项目中使用R2DBC与MongoDb）","attrs":{}}]}],"attrs":{}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"二、武松打虎","attrs":{}}]},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"2.1 单独solo Mysql","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"我们创建了一个测试库r2dbc_test，里面有一个user表。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"sql"},"content":[{"type":"text","text":"# 创建测试库\ncreate database r2dbc_test;\n\n# 创建表\ncreate table r2dbc_test.user(\n id int auto_increment primary key ,\n name varchar(12)\n);\n","attrs":{}}]},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"2.1.1 项目引入R2dbc","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"略..给出链接，如果感兴趣可以看看，","attrs":{}},{"type":"link","attrs":{"href":"https://docs.spring.io/spring-data/r2dbc/docs/current/reference/html/","title":"","type":null},"content":[{"type":"text","text":"Spring Data R2DBC","attrs":{}}]},{"type":"text","text":",","attrs":{}},{"type":"text","marks":[{"type":"del","attrs":{}}],"text":"（实在太多，这个时间点懒得写了，后面有时间再补一下）","attrs":{}},{"type":"text","text":"，","attrs":{}}]},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"2.1.2 测试代码","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"创建表对结构对应实体类：user","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"java"},"content":[{"type":"text","text":"@Data\n@Table(\"user\")\n@NoArgsConstructor\n@AllArgsConstructor\npublic class User implements Persistable<Integer> {\n @Id\n private Integer id;\n private String name;\n\n @Override\n public boolean isNew() {\n return true;\n }\n}\n","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"这里面有个坑点，那就是为什么实现","attrs":{}},{"type":"codeinline","content":[{"type":"text","text":"org.springframework.data.domain.Persistable","attrs":{}}],"attrs":{}},{"type":"text","text":"这个接口呢，先卖个关子，看完Repository后在描述哈。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Repository如下代码所示。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"java"},"content":[{"type":"text","text":"/**\n * <br>User Repository</br>\n *\n * @author fattyca1@qq.com\n * @since 2022/8/26\n */\n@Repository\npublic interface UserR2dbcRepository extends R2dbcRepository<User, Integer> {\n\n}\n","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"我们直接使用了Spring提供好的","attrs":{}},{"type":"codeinline","content":[{"type":"text","text":"org.springframework.data.r2dbc.repository.R2dbcRepository","attrs":{}}],"attrs":{}},{"type":"text","text":"，里面有一些基础的实现类。我们在测试的时候使用了","attrs":{}},{"type":"codeinline","content":[{"type":"text","text":"org.springframework.data.repository.reactive.ReactiveCrudRepository#save()","attrs":{}}],"attrs":{}},{"type":"text","text":"方法，这个方法会去判断这个实体对象是不是new object，如果不是，则会去Update。而判断的方法则是","attrs":{}},{"type":"codeinline","content":[{"type":"text","text":"org.springframework.data.domain.Persistable#isNew()","attrs":{}}],"attrs":{}},{"type":"text","text":"方法。所以这就是我们为啥要实现这个接口。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"接着写一个简单测试的Controller，代码如下所示。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"java"},"content":[{"type":"text","text":"@RestController\n@EnableR2dbcRepositories\npublic class TransactionController {\n @Autowired\n private UserR2dbcRepository repository;\n @Autowired\n private TransactionalOperator operator;\n\n // 根据seed当做初始ID，初始化数据库对象, 便于测试\n @RequestMapping(\"/r2dbc/init\")\n public Flux<User> init(Integer seed) {\n Flux<User> userFlux = Flux.range(seed, 5).map(id -> new User(id,\"name\" + id))\n .flatMap(repository::save);\n return userFlux;\n }\n\n // 先删除一条记录， 然后在添加一条记录\n @RequestMapping(\"/r2dbc/delete\")\n public Mono<User> delete(Integer id1, Integer id2) {\n Mono<Void> id1Mono = repository.deleteById(id1);\n Mono<User> id2Mono = repository.save(new User(id2, \"name\" + id2));\n return id1Mono.then(id2Mono).as(operator::transactional);\n }\n}\n","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}}]}",
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"article_title": "在Spring data中使用r2dbc",
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"article_summary": "上篇文章我们讲到了怎么在Spring webFlux中使用r2dbc,今天我们看一下怎么使用spring-data-r2dbc这个Spring data对r2dbc的封装来进行r2dbc操作。",
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"content_short": "{"type":"doc","content":[{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":"简介","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"上篇文章我们讲到了怎么在Spring webFlux中使用r2dbc,今天我们看一下怎么使用spring-data-r2dbc这个Spring data对r2dbc的封装来进行r2dbc操作。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":"依赖关系","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"要使用Spring-datea-r2dbc需要配置下面的依赖关系：","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":" <dependencies>\n <dependency>\n <groupId>org.springframework.boot</groupId>\n <artifactId>spring-boot-starter-data-r2dbc</artifactId>\n <version>2.3.3.RELEASE</version>\n </dependency>\n\n <!-- R2DBC H2 Driver -->\n <dependency>\n <groupId>io.r2dbc</groupId>\n <artifactId>r2dbc-h2</artifactId>\n <version>${r2dbc-h2.version}</version>\n </dependency>\n\n <dependency>\n <groupId>org.springframework.boot</groupId>\n <artifactId>spring-boot-starter-webflux</artifactId>\n </dependency>\n","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":"数据库连接配置","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"Spring-data-r2dbc使用的是R2dbcProperties来进行配置文件的读取：","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"简单看一下R2dbcProperties的定义：","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"@ConfigurationProperties(prefix = \"spring.r2dbc\")\npublic class R2dbcProperties {\n\n /**\n * Database name. Set if no name is specified in the url. Default to \"testdb\" when\n * using an embedded database.\n */\n private String name;\n\n /**\n * Whether to generate a random database name. Ignore any configured name when\n * enabled.\n */\n private boolean generateUniqueName;\n\n /**\n * R2DBC URL of the database. database name, username, password and pooling options\n * specified in the url take precedence over individual options.\n */\n private String url;\n\n /**\n * Login username of the database. Set if no username is specified in the url.\n */\n private String username;\n\n /**\n * Login password of the database. Set if no password is specified in the url.\n */\n private String password;\n","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"相应的，看一下我们的配置文件是怎么样的：","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"spring.r2dbc.url=r2dbc:h2:mem://./testdb\nspring.r2dbc.username=sa\nspring.r2dbc.password=password\n","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"这里，我们使用的是H2数据库。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":"数据库初始化","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"数据库初始化过程中，我们需要创建一个users表格，这里我们在一个initDatabase bean中实现：","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":" @Bean\n public ApplicationRunner initDatabase(DatabaseClient client, UsersDao usersDao) {\n List<String> statements = Arrays.asList(\n \"DROP TABLE IF EXISTS USERS;\",\n \"CREATE TABLE IF NOT EXISTS USERS ( id SERIAL PRIMARY KEY, firstname VARCHAR(100) NOT NULL, lastname VARCHAR(100) NOT NULL);\");\n\n statements.forEach(sql -> executeSql(client,sql)\n .doOnSuccess(count -> log.info(\"Schema created, rows updated: {}\", count))\n .doOnError(error -> log.error(\"got error : {}\",error.getMessage(),error))\n .subscribe()\n );\n\n return args ->getUser().flatMap(usersDao::save).subscribe(user -> log.info(\"User saved: {}\", user));\n\n }\n\n private Flux<Users> getUser() {\n return Flux.just(new Users(null, \"John\", \"Doe\"), new Users(null, \"Jane\", \"Doe\"));\n }\n\n private Mono<Integer> executeSql(DatabaseClient client, String sql) {\n return client.execute(sql).fetch().rowsUpdated();\n }\n","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"上面的例子中，我们创建数据库分为了两部分，第一部分是数据库schema的操作，我们执行了drop和create table的操作。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"第二部分是向数据库表中插入数据。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"注意，上面的两部分操作都需要执行subscribe操作，以触发真正的Reactive操作。","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":1},"content":[{"type":"text","text":"DAO操作","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在DAO操作之前，我们需要创建Users entity：","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"@Data\n@AllArgsConstructor\npublic class Users {\n\n @Id\n private Integer id;\n private String firstname;\n private String lastname;\n\n boolean hasId() {\n return id != null;\n }\n}\n","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"再看一下我们创建的UserDao：","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":null},"content":[{"type":"text","text":"public interface UsersDao extends ReactiveCrudRepository<Users, Long> {\n\n @Query(\"select id, firstname, lastname from users c where c.lastname = :lastname\")\n Flux<Users> findByLastname(String lastname);\n}\n\n","attrs":{}}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}}]}",
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