R2dbc操作mysql 注意下面红色部分与上一篇"Spring WebFlux 响应式异步编程|道法术器(一)" 不一样的依赖包

技术整合:

<!--设置spring-boot依赖的版本 -->
<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.6.5</version> <!--2.4.11--><relativePath/> <!-- lookup parent from repository -->
</parent>

<!--R2DBC是基于Reactive Streams标准来设计的。通过使用R2DBC，你可以使用reactive API来操作数据。同时R2DBC只是一个开放的标准，而各个具体的数据库连接实现，需要实现这个标准。-->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-r2dbc</artifactId>
</dependency>
<!--响应式编程传统的jdbc操作是阻塞式的，所以不能再用以前的mysql驱动了-->
<dependency><groupId>dev.miku</groupId><artifactId>r2dbc-mysql</artifactId>
</dependency>

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope>
</dependency>
<!--reactor-test测试相关类-->
<dependency><groupId>io.projectreactor</groupId><artifactId>reactor-test</artifactId>
</dependency>

<!-- 响应式编程集成-->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-webflux</artifactId>
</dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><scope>provided</scope>
</dependency>
<dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId>
</dependency><!--连接mysql数据库的驱动 -->
<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId>
</dependency>

application.yml配置文件: 配置文件url与上一篇有细小的区别, 不小心就驱动保错:

报错信息:

     at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.17.jar:5.3.17]
   ... 63 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'connectionFactory' defined in class path resource [org/springframework/boot/autoconfigure/r2dbc/ConnectionFactoryConfigurations$PoolConfiguration$PooledConnectionFactoryConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.r2dbc.pool.ConnectionPool]: Factory method 'connectionFactory' threw exception; nested exception is java.lang.IllegalArgumentException: URL mysql://localhost:3306/tope-pay-user?&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8&useSSL=false does not start with the r2dbc scheme
   at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1389) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1309) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.17.jar:5.3.17]
   ... 77 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.r2dbc.pool.ConnectionPool]: Factory method 'connectionFactory' threw exception; nested exception is java.lang.IllegalArgumentException: URL mysql://localhost:3306/tope-pay-user?&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8&useSSL=false does not start with the r2dbc scheme
   at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.17.jar:5.3.17]
   at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.17.jar:5.3.17]
   ... 91 common frames omitted
Caused by: java.lang.IllegalArgumentException: URL mysql://localhost:3306/tope-pay-user?&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8&useSSL=false does not start with the r2dbc scheme
   at io.r2dbc.spi.ConnectionUrlParser.validate(ConnectionUrlParser.java:54) ~[r2dbc-spi-0.8.6.RELEASE.jar:na]
   at io.r2dbc.spi.ConnectionUrlParser.parseQuery(ConnectionUrlParser.java:81) ~[r2dbc-spi-0.8.6.RELEASE.jar:na]
   at io.r2dbc.spi.ConnectionFactoryOptions.parse(ConnectionFactoryOptions.java:122) ~[r2dbc-spi-0.8.6.RELEASE.jar:na]
   at org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryOptionsInitializer.initializeRegularOptions(ConnectionFactoryOptionsInitializer.java:60) ~[spring-boot-autoconfigure-2.6.5.jar:2.6.5]
   at org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryOptionsInitializer.initialize(ConnectionFactoryOptionsInitializer.java:49) ~[spring-boot-autoconfigure-2.6.5.jar:2.6.5]
   at org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryConfigurations.createConnectionFactory(ConnectionFactoryConfigurations.java:62) ~[spring-boot-autoconfigure-2.6.5.jar:2.6.5]
   at org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryConfigurations$PoolConfiguration$PooledConnectionFactoryConfiguration.connectionFactory(ConnectionFactoryConfigurations.java:92) ~[spring-boot-autoconfigure-2.6.5.jar:2.6.5]
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_221]
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_221]
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_221]
   at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_221]
   at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.17.jar:5.3.17]
   ... 92 common frames omitted

大致的意思：不能根据配置文件初始化R2dbc数据库连接工厂:

sjava.lang.IllegalArgumentException: URL mysql://localhost:3306/tope-pay-user?&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8&useSSL=false

server:port: 9999servlet:context-path: /
spring:#连接数据库的url，前缀不再是jdbc而是换成r2dbc#这里可以配置连接池相关的其它属性，这里为了简洁不配置r2dbc:url: r2dbc:mysql://localhost:3306/tope-pay-user?&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=GMT%2B8&useSSL=falseusername: rootpassword: 123456logging:level:org.springframework.r2dbc: INFO  #输出执行的sqlorg.springframework.cloud.web.reactive: inforeactor.ipc.netty: info

数据持久层:

package org.jd.websocket.auth.data.reactor.repository;import org.jd.websocket.auth.data.reactor.entity.RSysSystem;
import org.springframework.data.repository.reactive.ReactiveCrudRepository;
import org.springframework.data.repository.reactive.ReactiveSortingRepository;
import org.springframework.stereotype.Repository;/*** 系统服务类异步编程模型接口* 增强了排序功能*/
@Repository
public interface RSysSystemReactiveRepository extends ReactiveCrudRepository<RSysSystem, Long>, ReactiveSortingRepository<RSysSystem, Long> {
}

业务领域模型:

package org.jd.websocket.auth.data.reactor.entity;import lombok.Data;
import lombok.RequiredArgsConstructor;
import org.springframework.data.annotation.Id;
import org.springframework.data.annotation.Transient;
import org.springframework.data.annotation.Version;
import org.springframework.data.relational.core.mapping.Column;
import org.springframework.data.relational.core.mapping.Table;
import org.springframework.format.annotation.DateTimeFormat;/*** 属性上的注解使用Spring-data中的相关注解*/
import java.io.Serializable;
import java.time.LocalDateTime;
import java.util.List;@Data
@RequiredArgsConstructor
@Table(value = "sys_system")
public class RSysSystem implements Serializable {@Transientprivate static final long serialVersionUID = 7481799808203597699L;// 主键自增@Id@Column(value = "system_id")private Long systemId;/*** 系统名称* 字段映射和约束条件* //对应数据库表中哪个列字段及对该字段的自定义*/@Column(value = "system_name")private String systemName;/*** 详细功能描述: 描述该系统主要包含那些那些模块，每个模块的大致功能*/@Column(value = "system_detail_desc")private String systemDetailDesc;/*** 系统跳转到功能版块路径*/@Column(value = "path_function_url")private String pathFunctionUrl;/*** 系统包含那些模块* 该字段不参与数据库映射*/@Transientprivate List<RSysModule> sysModules;/**** 创建时间*/@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")@Column(value = "create_time")private LocalDateTime createTime;/*** 更新时间*/@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")@Column(value = "update_time")private LocalDateTime updateTime;/*** 版本号（用于乐观锁, 默认为 1）* 使用 @Version 注解标注对应的实体类。* 可以通过 @TableField 进行数据自动填充。*/@Versionprivate Integer version;
}

业务接口与实现层:

package org.jd.websocket.auth.data.reactor.service;import org.jd.websocket.auth.data.reactor.entity.RSysSystem;
import reactor.core.publisher.Mono;public interface RSysSystemService {/*** 通过ID查找单条记录** @param systemId 系统服务ID* @return {@link Mono<RSysSystem>}*/Mono<RSysSystem> findById(Long systemId);/*** 插入记录信息** @param system* @return {@link Mono<RSysSystem>)*/Mono<RSysSystem> insert(RSysSystem system);/*** 通过ID查询是否存在记录** @param systemId 系统ID* @return {@link Mono<Boolean>}*/Mono<Boolean> exists(Long systemId);/*** 查询记录数** @return {@link Mono<Long>}*/Mono<Long> count();
}

接口实现层:

package org.jd.websocket.auth.data.reactor.service.impl;import lombok.extern.slf4j.Slf4j;
import org.jd.websocket.auth.data.reactor.entity.RSysSystem;
import org.jd.websocket.auth.data.reactor.repository.RSysSystemReactiveRepository;
import org.jd.websocket.auth.data.reactor.service.RSysSystemService;
import org.springframework.data.r2dbc.core.R2dbcEntityTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import reactor.core.publisher.Mono;
import javax.annotation.Resource;/*** 构建全调用链路异步响应式编程* 系统响应式查询服务*/
@Slf4j
@Service
public class RSysSystemServiceImpl implements RSysSystemService {@Resourceprivate RSysSystemReactiveRepository sysSystemReactiveRepository;@Overridepublic Mono<RSysSystem> findById(Long systemId) {return sysSystemReactiveRepository.findById(systemId);}@Override@Transactional(rollbackFor = Exception.class)public Mono<RSysSystem> insert(RSysSystem system) {return sysSystemReactiveRepository.save(system);}@Overridepublic Mono<Boolean> exists(Long systemId) {return sysSystemReactiveRepository.existsById(systemId);}@Overridepublic Mono<Long> count() {return sysSystemReactiveRepository.count();}
}

暴露服务端点:

package org.jd.websocket.auth.data.reactor.controller;import org.jd.websocket.auth.data.reactor.entity.RSysSystem;
import org.jd.websocket.auth.data.reactor.service.RSysSystemService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import reactor.core.publisher.Mono;import javax.annotation.Resource;@RestController
@RequestMapping("/system")
public class SysSystemController {@Resourceprivate RSysSystemService rSysSystemService;@GetMapping("/getSysSystemById/{systemId}")public Mono<RSysSystem> getSySystem(@PathVariable("systemId") Long systemId) {Mono<RSysSystem> result = rSysSystemService.findById(systemId);System.out.println("result:" + result.toString());return result;}}

访问测试:

http://localhost:9999/system/getSysSystemById/1

结果: