SpringBoot项目中同时操作多个数据库的实现方法
目录
- 1、导入相关pom文件
- 二、application.yml配置文件编写
- 三、数据库连接配置文件
- 四、主启动类注解修改
- 五、测试
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:
1、导入相关pom文件
<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:
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:
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:
@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:
@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
@SpringBootApplication(exclude={<!--{cke_protected}{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:
public interface DevMapper { @Select("select * from test") List<Test> getAllTest(); }
public interface LocalMapper { @Insert("insert into payment(serial) values (#{name})") int insertMessage(String name); }
@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
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