在Spring Boot中使用两个数据源

如果有人有这个问题,我已经找到了解决方案:

首先,你 application.properties 应该是这样的:

datasource:
primary:
    url: jdbc:mysql://localhost:3306/primary_db
    username: your_username
    password: your_password
    driver-class-name: com.mysql.jdbc.Driver
secondary:
    url: jdbc:mysql://localhost:3306/secondary_db
    username: your_username
    password: your_password
    driver-class-name: com.mysql.jdbc.Driver

之后,您必须使用数据库创建一个枚举:

public enum Database {
    PRIMARY,
    SECONDARY
}

public class DatabaseThreadContext {

    private static final ThreadLocal<Database> current = new ThreadLocal<>();

    public static void setCurrentDatabase(Database database) {
        current.set(database);
    }

    public static Object getCurrentDatabase() {
        return current.get();
    }

}

AbstractRoutingDataSource

public class RoutingDataSource extends AbstractRoutingDataSource {

    @Override
    protected Object determineCurrentLookupKey() {
        return DatabaseThreadContext.getCurrentDatabase();
    }

}

最后,在Spring Boot应用程序中注入配置:

@Configuration
public class DatabaseRouter {

    @Bean
    @ConfigurationProperties(prefix="datasource.primary")
    public DataSource primaryDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    @ConfigurationProperties(prefix="datasource.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean
    @Primary
    public DataSource dataSource() {
        Map<Object, Object> targetDatasources = new HashMap<Object, Object>(){{
            put(Database.SECONDARY, secondaryDataSource());
            put(Database.PRIMARY, primaryDataSource());
        }};
        RoutingDataSource routingDataSource = new RoutingDataSource();
        routingDataSource.setDefaultTargetDataSource(primaryDataSource());
        routingDataSource.setTargetDataSources(targetDatasources);
        routingDataSource.afterPropertiesSet();
        return routingDataSource;
    }

}

在每个请求中,如果要在数据库之间进行更改,只需使用以下功能: DatabaseThreadContext.setCurrentDatabase(Database.PRIMARY); .

此外,您可以同时拥有两个以上的数据库。