是否可以在Dropwizard中配置多个数据库连接？

Question

我正在研究一些利用Dropwizard的代码,这需要我需要连接到至少两个不同的数据库(我计划也使用Hibernate).我无法找到任何允许我在.yml配置文件的数据库块中配置两个不同数据库连接的示例/文档.这可能在Dropwizard中吗？如果没有,那么过去人们使用的解决方法是什么.谢谢你先进的帮助!

Answer 1

您可以在dropwizard中配置多个数据库.在config.yml中,您可以拥有多个这样的数据库配置.

数据库1:

driverClass: org.postgresql.Driver
user: user
password: pwd
url: jdbc:postgresql://localhost:5432/db1
validationQuery: select 1
minSize: 2
maxSize: 8

DATABASE2:

driverClass: org.postgresql.Driver
user: user
password: pwd
url: jdbc:postgresql://localhost:5432/db2
validationQuery: select 1
minSize: 2
maxSize: 8

在config类中获取两个配置详细信息.

public class DBConfig extends Configuration {

    private DatabaseConfiguration database1;
    private DatabaseConfiguration database2;

    public DatabaseConfiguration getDatabase1() {
        return database1;
    }

    public DatabaseConfiguration getDatabase2() {
        return database2;
    }
}

并在您的服务中配置哪个Dao使用哪个数据库.

@Override
public void run(MyConfiguration configuration,
                Environment environment) throws ClassNotFoundException {
    ... 

    final DBIFactory factory = new DBIFactory();

    // Note that the name parameter when creating the DBIs must be different
    // Otherwise you get an IllegalArgumentException
    final DBI jdbi1 = factory.build(
            environment, configuration.getUserDatabase(), "db1");
    final DBI jdbi2 = factory.build(
            environment, configuration.getItemDatabase(), "db2");

    final MyFirstDAO firstDAO = jdbi1.onDemand(MyFirstDAO.class);
    final MySecondDAO secondDAO = jdbi2.onDemand(MySecondDAO.class);

    ...
}