java – 在Spring Boot中使用两个数据源

首先,您的application.properties应如下所示：

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枚举：

public enum Database {
    PRIMARY,SECONDARY
}

然后,您创建一个ThreadLocal：

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();
    }

}

这就是魔术,你必须使用在2007年春季2中实现的AbstractRoutingDataSource：

public class RoutingDataSource extends AbstractRoutingDataSource {

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

}

最后在Spring Boot App中注入一个配置：

@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,只需使用此函数：DatabaseThreadContext.setCurrentDatabase(Database.PRIMARY);.

此外,您可以同时拥有两个以上的数据库.