SpringBoot3+ShardingJDBC5.5.0 读写分离配置的实现

网上自己找了很多教程但是配合SpringBoot3都无法使用，经过实验发现只有最新版5.5.0支持SpringBoot3x现在把相关读写分离配置分享给大家

相关springboot3的包这里就不多赘述，我使用的是MyBATisPlus 3.5.5

首先导入相关jar包

         <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>shardingsphere-jdbc</artifactId>
         编程   <version>5.5.0</version>
            <exclusions>
                <exclusion>
                    <groupId>org.apache.shardinjEbMUuCKgsphere</groupId>
                    <artifactId>shardingsphere-test-util</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

这里放一个完整的pom给大家看看

<?XML version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <packaging>pom</packaging>
    <groupId>com.yijun.sharding.jdbc</groupId>
    <artifactId>spring-boot3-sharding-jdbc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot3-sharding-jdbc</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <Java.version>17</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>3.2.4</spring-boot.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-undertow</artifactId>
        </dependency>
        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.30</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.13.0</version>
        </dependency>
        <dependency>
            <groupId>jakarta.persistence</groupId>
            <artifactId>jakarta.persistence-api</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>3.0.3</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.5</version>
            <exclusions>
                <exclusion>
                    <groupId>org.mybatis</groupId>
                    <artifactId>mybatis-spring</artifactId>
                </exclusion>
                <exclusion>
                    <artifactId>mybatis</artifactId>
                    <groupId>org.mybatis</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>shardingsphere-jdbc</artifactId>
            <version>5.5.0</version>
            <exclusions>编程;
                <exclusion>
                    <groupId>org.apache.shardingsphere</groupId>
                    <artifactId>shardingsphere-test-util</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </编程客栈dependencies>

    <dependencyManagement>
        <dependencies>
            <!-- 对spring-boot版本统一管理-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

第二部对springboot的application进行修改

spring:
  main:
    allow-bean-definition-overriding: true
  application:
    name: ls-backend
  datasource:
    driver-class-name: org.apache.shardingsphere.driver.ShardingSphereDriver
    url: jdbc:shardingsphere:classpath:sharding.yaml
  servlet:
    multipart:
      max-file-size: 100MB
      max-request-size: 100MB
server:
  port: 8085
  servlet:
    context-path: /
    encoding:
      force-response: true


#Mybatis扫描
mybatis:
  config-location: classpath:/mybatis-config.xml

mybatis-plus:
  mapper-locations: classpath:/mapper/*Mapper.xml
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImp

那么接下来就是重点了，然后是sharding.yaml的相关配置，因为官方的文档比较碎片化，最后进行校验和处理得出的完整文档

dataSources:
  ds_1:
    driverClassName: com.mysql.cj.jdbc.Driver
    dataSourceClassName: com.zaxxer.hikari.HikariDataSource
    jdbcUrl: 
    username: 
    password: 
  ds_2:
    driverClassName: com.mysql.cj.jdbc.Driver
    dataSourceClassName: com.zaxxer.hikari.HikariDataSource
    jdbcUrl: 
    username: 
    password: 
rules:
  - !SINGLE
    tables:
      - "*.*"
    defaultDataSource: ds_1
  - !REAdwRITE_SPLITTING
    dataSources:
      readwrite_ds:
        writeDataSourceName: ds_1
        readDataSourceNames:
          - ds_2
        transactionalReadQueryStrategy: PRIMARY
        loadBalancerName: random
    loadBalancers:
      random:
        type: RANDOM
props:
  sql-show: true

这里我是用一个读库一个写库处理，数据库连接自己填，打印SQL可以开启可以看到读和写走到了不同的库，至于数据分片就不多赘述，我自己也没验证，不过估计在配置文件加入分片规则就可以做到，还有rules的下的配置一定要写SINGLE这个 不然它会报找不到表的错误，还有这个配置目前只有shardingjdbc 5.4javascript.1和5.5.0可以用，其他版本并不通用 请不要混用

这里考虑到强制走写库的情况自己根据HintManager写了一个强制主库的注解和AOP如下:

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)public @interface Master {}

@Slf4j
@Component
@ASPect
public class ShardingAop {

    @Around("execution(* com.yijun..service.impl.*.*(..))")
    public Object master(ProceedingJoinPoint joinPoint){
        Object[] args = joinPoint.getArgs();
        Object ret = null;
        log.info(joinPoint.toShortString());
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        Method method = methodSignature.getMethod();
        Master  master = method.getAnnotation(Master.class);
        HintManager hintManager = null;
        try {
            if (Objects.nonNull(master)) {
                HintManager.clear();
                hintManager = HintManager.getInstance();
                hintManager.setWriteRouteOnly();
            }
            ret = joinPoint.proceed(args);
        }catch (Exception ex){
            log.error("exception error",ex);
        }catch (Throwable ex2){
            log.error("Throwable",ex2);
        }finally {
            if (Objects.nonNull(master) && Objects.nonNull(hintManager)) {
                hintManager.close();
            }
        }
        return ret;
    }
}

设置这个AOP后只要在service实现类方法上加上@Master注解就可以强制走读库处理了，其他情况安正常处理

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