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redis-mybatis-plus-starter

简介

该项目主要利用SpringBoot的自动化配置特性来实现快速的将Mybatis-Plus + 多数据源 + Redis二级缓存 + Phoenix引入Springboot项目中,简化原生Mybatis-Plus整合多数据源、Mybatis Redis二级缓存和Phoenix使用。

欢迎使用和star支持,如使用中碰到问题,可以提出Issue,我会尽力完善该Starter

版本基础

  • Mybatis-Plus: 3.2.0
  • Spring-Boot: 2.2.2.RELEASE
  • Druid: 1.1.16

Quick-Start

轻松引入SpringBoot工程中,需要如下步骤:

  • pom.xml中引入依赖:
<dependency>
    <groupId>com.github.flyingglass</groupId>
    <artifactId>redis-mybatis-plus-starter</artifactId>
    <version>1.0.0</version>
</dependency>
  • 在应用主类中增加@MapperScan(basePackages = "com.xxx.mapper")注解,用于扫描MapperInterface,并且排除DruidDataSourceAutoConfigure
@MapperScan(basePackages = "com.xxx.mapper")
@SpringBootApplication(
        exclude = DruidDataSourceAutoConfigure.class
)
public class Bootstrap {

    public static void main(String[] args) {
        SpringApplication.run(Bootstrap.class, args);
    }

}
  • 配置application.yml
spring:
  datasource:
    druid:
      stat-view-servlet:
        enabled: true
        reset-enable: true
        url-pattern: /druid/*
        allow:
        deny:
      web-stat-filter:
        enabled: true
        exclusions: '*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*'
        profile-enable: true
        session-stat-enable: false

    dynamic:
      # 全局配置,数据源可覆盖
      druid:
        initial-size: 5 # 初始连接数
        max-active: 10 # 最大连接池数量
        min-idle: 5 # 最小连接池数量
        max-wait: 60000
        pool-prepared-statements: false
        validation-query: "SELECT 1"
        test-on-borrow: false
        test-on-return: false
        test-while-idle: true
        time-between-eviction-runs-millis: 3000
        min-evictable-idle-time-millis: 300000
        # Filter
        # wall不兼容phoenix
        filters: stat
        stat:
          log-slow-sql: true
          slow-sql-millis: 5000
          merge-sql: true

      primary: master
      datasource:
        master:
          username: ${mysql.username}
          password: ${mysql.password}
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://localhost:3306/master_db
                  
mybatis-plus:
  # classpath要加上后面的*,表示通配符,匹配任意路径
  mapper-locations: classpath*:/mapper/*Mapper.xml
  typeAliasesPackage: com.fly.demo.entity
  configuration:
    map-underscore-to-camel-case: true
    cache-enabled: true # 开启xml缓存
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  global-config:
    db-config:
      id-type: auto

配置说明

配置Redis作为Mybatis的二级缓存

主要实现了MybatisRedisCacheLoggingRedisCache,其中LoggingRedisCacheMybatisRedisCache的装饰类,主要用日志输出,其中MybatisRedisCache实现了Mybatis二级缓存的Cache接口,通过flushInterval(精确到毫秒)参数控制缓存过期,缓存过期策略为Redis默认的lazy和定期删除策略,默认的过期策略可能expire时间会出现微小偏差,几乎可以忽略。

使用MybatisRedisCache需要如下配置:

  • application.yml添加Redis配置:
spring:
  redis:
    database: 0
    host: localhost
    port: 6379
    timeout: 5000
    jedis:
      pool:
        max-active: 8
        max-idle: 8
        min-idle: 0
        max-wait: -1
  • 配置CacheNamespace,支持注解或xml配置(记得在Mybatis-Plus打开cache-enabled属性),演示注解例子:
@CacheNamespace(
        implementation = MybatisRedisCache.class,
        properties = { @Property(
                name = "flushInterval",
                value = "5000"
        )}
)
public interface TestMapper extends BaseMapper<Test> {

}
  • 可自定义RedisTemplate,控制Cache的序列化或者反序列,项目默认会注入spring-data-redis默认的RedisTemplate

配置多数据源(参考Mybatis-Plus的多数据源)

  • 简单样例,配置application.yml
spring:
  datasource:
    dynamic:
      primary: master
      datasource:
        master:
          username: ${mysql.username}
          password: ${mysql.password}
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://${mysql.host}:${mysql.port}/master_db

        slave_1:
          username: ${mysql.username}
          password: ${mysql.password}
          driver-class-name: com.mysql.cj.jdbc.Driver
          url: jdbc:mysql://${mysql.host}:${mysql.port}/slave_db
  • 使用@DS注解进行切换,建议在Service层添加注解,使用样例:
@DS("slave_1")
public class TestServiceImpl extends ServiceImpl<TestMapper, Test> implements ITestService {

}

特性和扩展

  • Starter中的BaseDODefaultMetaObjectHandler会默认填充gmtCreategmtUpdated字段,可以自定义MetaObjectHandlerBean进行覆盖。
  • Mybatis-Plus整合Phoenix