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SpringBoot项目中同时操作多个数据库的实现方法

在实际项目开发中可能存在需要同时操作两个数据库的场景,比如从A库读取数据,进行操作后往B库中写入数据,此时就需要进行多数据库配置。本文以操作本地和线上的MySQL数据库为例:

一、导入相关pom文件

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< dependency >

     < groupId >mysql</ groupId >

     < artifactId >mysql-connector-java</ artifactId >

     < scope >runtime</ scope >

</ dependency >

 

< dependency >

     < groupId >org.springframework.boot</ groupId >

     < artifactId >spring-boot-starter-jdbc</ artifactId >

</ dependency >

 

< dependency >

     < groupId >org.mybatis</ groupId >

     < artifactId >mybatis</ artifactId >

     < version >3.5.5</ version >

</ dependency >

 

< dependency >

     < groupId >com.alibaba</ groupId >

     < artifactId >druid</ artifactId >

     < version >1.2.3</ version >

</ dependency >

 

< dependency >

     < groupId >org.mybatis</ groupId >

     < artifactId >mybatis-spring</ artifactId >

     < version >2.0.7</ version >

</ dependency >

 

< dependency >

     < groupId >org.projectlombok</ groupId >

     < artifactId >lombok</ artifactId >

     < optional >true</ optional >

</ dependency >

二、application.yml配置文件编写

单数据源的配置如下:

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spring:

   datasource:

     driver-class-name: com.mysql.cj.jdbc.Driver

     url: jdbc:mysql://127.0.0.1:3306/meal_order?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8

     username: root

     password: root

     type: com.alibaba.druid.pool.DruidDataSource

多数据源的配置如下:

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spring:

   datasource:

     dev:

       driver-class-name: com.mysql.cj.jdbc.Driver

       jdbcUrl: jdbc:mysql://xxx.xx.xx.xx:3306/meal_order?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8

       username: root

       password: root

       type: com.alibaba.druid.pool.DruidDataSource

     local:

       driver-class-name: com.mysql.cj.jdbc.Driver

       jdbcUrl: jdbc:mysql://127.0.0.1:3306/db2021?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8

       username: root

       password: root

       type: com.alibaba.druid.pool.DruidDataSource

经过对比可以发现:
1、多数据源的配置中需要指定具体的名称来区分不同的数据库(上述配置中的dev和local,名称可以根据具体需求自定义)
2、需要使用jdbcUrl代替url

三、数据库连接配置文件

dev数据源配置文件:

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@Configuration

@MapperScan (basePackages = "com.multiple.mapper.dev" ,sqlSessionFactoryRef = "devSqlSessionFactory" )

public class DevDataSourceConfig {

     @Primary

     @Bean (name = "devDataSource" )

     @ConfigurationProperties ( "spring.datasource.dev" )

     public DataSource masterDataSource(){

         return DataSourceBuilder.create().build();

     }

 

     @Bean (name = "devSqlSessionFactory" )

     public SqlSessionFactory sqlSessionFactory( @Qualifier ( "devDataSource" ) DataSource dataSource) throws Exception {

         SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();

         sessionFactoryBean.setDataSource(dataSource);

         sessionFactoryBean.setMapperLocations( new PathMatchingResourcePatternResolver()

                 .getResources( "classpath:mapping/dev/*.xml" ));

         return sessionFactoryBean.getObject();

     }

}

local数据源配置文件:

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@Configuration

@MapperScan (basePackages = "com.multiple.mapper.local" ,sqlSessionFactoryRef = "localSqlSessionFactory" )

public class LocalDataSourceConfig {

     @Primary

     @Bean (name = "localDataSource" )

     @ConfigurationProperties ( "spring.datasource.local" )

     public DataSource masterDataSource(){

         return DataSourceBuilder.create().build();

     }

 

     @Bean (name = "localSqlSessionFactory" )

     public SqlSessionFactory sqlSessionFactory( @Qualifier ( "localDataSource" ) DataSource dataSource) throws Exception {

         SqlSessionFactoryBean sessionFactoryBean = new SqlSessionFactoryBean();

         sessionFactoryBean.setDataSource(dataSource);

         sessionFactoryBean.setMapperLocations( new PathMatchingResourcePatternResolver()

                 .getResources( "classpath:mapping/local/*.xml" ));

         return sessionFactoryBean.getObject();

     }

}

不同配置文件通过@MapperScan注解的内容来区分不同数据库下的mapper文件,通过@ConfigurationProperties注解来加载指定的数据源

以DevDataSourceConfig为例

四、主启动类注解修改

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@SpringBootApplication (exclude={<!--{C}%3C!%2D%2D% 20 %2D%2D%3E-->DataSourceAutoConfiguration. class })

目录结构如下:

五、测试

从dev库中查询数据,取出字段插入local库中:

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public interface DevMapper {

     @Select ( "select * from test" )

     List<Test> getAllTest();

}

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public interface LocalMapper {

     @Insert ( "insert into payment(serial) values (#{name})" )

     int insertMessage(String name);

}

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@SpringBootTest

class MultipleDatabaseApplicationTests {

 

     @Autowired

     private DevMapper devMapper;

 

     @Autowired

     private LocalMapper localMapper;

 

     @Test

     void contextLoads() {

         List<com.multiple.pojo.Test> testList = devMapper.getAllTest();

         for (com.multiple.pojo.Test test : testList){

             localMapper.insertMessage(test.getAa());

         }

     }

}

运行测试代码,从dev库中查出的数据可以成功添加至local库
该方法也适用需要使用多种不同的数据库的场景,比如MySQL和Oracle,修改数据源配置文件即可

到此这篇关于SpringBoot项目中同时操作多个数据库的实现方法的文章就介绍到这了,更多相关SpringBoot项目操作多个数据库内容请搜索以前的文章或继续浏览下面的相关文章希望大家以后多多支持!

原文链接:https://blog.csdn.net/qq_44042316/article/details/123458902

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