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README
Apache-2.0

一个基于springboot的快速集成多数据源的启动器

Github | 码云Gitee

简介

dynamic-datasource-spring-boot-starter 是一个基于springboot的快速集成多数据源的启动器。

其支持 Jdk 1.7+, SpringBoot 1.4.x 1.5.x 2.0.x。最新版为

示例项目 可参考项目下的samples目录。

示例项目 可参考项目下的samples目录。

示例项目 可参考项目下的samples目录。

优势

网上关于动态数据源的切换的文档有很多,核心只有两种。

  1. 构建多套环境,优势是方便控制也容易集成一些简单的分布式事物,缺点是非动态同时代码量较多,配置难度大。
  2. 基于spring提供原生的 AbstractRoutingDataSource ,参考一些文档自己实现切换。

如果你的数据源较少,场景不复杂,选择以上任意一种都可以。如果你需要更多特性,请尝试本动态数据源。

  1. 数据源分组,适用于多种场景 纯粹多库 读写分离 一主多从 混合模式。
  2. 简单集成Druid数据源监控多数据源,简单集成Mybatis-Plus简化单表,简单集成P6sy格式化sql,简单集成Jndi数据源。
  3. 简化Druid和HikariCp配置,提供全局参数配置。
  4. 提供自定义数据源来源(默认使用yml或properties配置)。
  5. 项目启动后能动态增减数据源。
  6. 使用spel动态参数解析数据源,如从session,header和参数中获取数据源。(多租户架构神器)
  7. 多层数据源嵌套切换。(一个业务ServiceA调用ServiceB,ServiceB调用ServiceC,每个Service都是不同的数据源)
  8. 使用正则匹配或spel表达式来切换数据源(实验性功能)。

劣势

不能使用多数据源事物(同一个数据源下能使用事物),网上其他方案也都不能提供。

如果你需要使用到分布式事物,那么你的架构应该到了微服务化的时候了。

如果呼声强烈,项目达到800 star,作者考虑集成分布式事物。

PS: 如果您只是几个数据库但是有强烈的需求分布式事物,建议还是使用传统方式自己构建多套环境集成atomic这类,网上百度很多。

约定

  1. 本框架只做 切换数据源 这件核心的事情,并不限制你的具体操作,切换了数据源可以做任何CRUD。
  2. 配置文件所有以下划线 _ 分割的数据源 首部 即为组的名称,相同组名称的数据源会放在一个组下。
  3. 切换数据源即可是组名,也可是具体数据源名称,切换时默认采用负载均衡机制切换。
  4. 默认的数据源名称为 master ,你可以通过spring.datasource.dynamic.primary修改。
  5. 方法上的注解优先于类上注解。

建议

强烈建议在 主从模式 下遵循普遍的规则,以便他人能更轻易理解你的代码。

主数据库 建议 只执行 INSERT UPDATE DELETE 操作。

从数据库 建议 只执行 SELECT 操作。

使用方法

  1. 引入dynamic-datasource-spring-boot-starter。
<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
  <version>${version}</version>
</dependency>
  1. 配置数据源。
spring:
  datasource:
    dynamic:
      primary: master #设置默认的数据源或者数据源组,默认值即为master
      datasource:
        master:
          username: root
          password: 123456
          driver-class-name: com.mysql.jdbc.Driver
          url: jdbc:mysql://xx.xx.xx.xx:3306/dynamic
        slave_1:
          username: root
          password: 123456
          driver-class-name: com.mysql.jdbc.Driver
          url: jdbc:mysql://xx.xx.xx.xx:3307/dynamic
        slave_2:
          username: root
          password: 123456
          driver-class-name: com.mysql.jdbc.Driver
          url: jdbc:mysql://xx.xx.xx.xx:3308/dynamic
       #......省略
       #以上会配置一个默认库master,一个组slave下有两个子库slave_1,slave_2
# 多主多从                      纯粹多库(记得设置primary)                   混合配置
spring:                               spring:                               spring:
  datasource:                           datasource:                           datasource:
    dynamic:                              dynamic:                              dynamic:
      datasource:                           datasource:                           datasource:
        master_1:                             mysql:                                master:
        master_2:                             oracle:                               slave_1:
        slave_1:                              sqlserver:                            slave_2:
        slave_2:                              postgresql:                           oracle_1:
        slave_3:                              h2:                                   oracle_2:
  1. 使用 @DS 切换数据源。

@DS 可以注解在方法上和类上,同时存在方法注解优先于类上注解

注解在service实现或mapper接口方法上,但强烈不建议同时在service和mapper注解。 (可能会有问题)

注解 结果
没有@DS 默认数据源
@DS("dsName") dsName可以为组名也可以为具体某个库的名称
@Service
@DS("slave")
public class UserServiceImpl implements UserService {

  @Autowired
  private JdbcTemplate jdbcTemplate;

  public List<Map<String, Object>> selectAll() {
    return  jdbcTemplate.queryForList("select * from user");
  }
  
  @Override
  @DS("slave_1")
  public List<Map<String, Object>> selectByCondition() {
    return  jdbcTemplate.queryForList("select * from user where age >10");
  }
}

在mybatis环境下也可注解在mapper接口层。

@DS("slave")
public interface UserMapper {

  @Insert("INSERT INTO user (name,age) values (#{name},#{age})")
  boolean addUser(@Param("name") String name, @Param("age") Integer age);

  @Update("UPDATE user set name=#{name}, age=#{age} where id =#{id}")
  boolean updateUser(@Param("id") Integer id, @Param("name") String name, @Param("age") Integer age);

  @Delete("DELETE from user where id =#{id}")
  boolean deleteUser(@Param("id") Integer id);

  @Select("SELECT * FROM user")
  @DS("slave_1")
  List<User> selectAll();
}

赶紧集成体验一下吧! 如果需要更多功能请继续往下看!


  • Druid集成,MybatisPlus集成,动态增减数据源等等更多更细致的文档在这里 点击查看

  • 项目Javadoc一览 点击查看

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简介

基于 SpringBoot 多数据源 动态数据源 主从分离 快速启动器 展开 收起
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