无法指定多个数据库连接以执行测试。
You cannot specify more than one database connection for test execution.
您现在可以使用多个数据库解析器来验证脚本语法，然后依次在多个数据库连接中执行脚本。
You can now validate the syntax in scripts with multiple database parsers, and run scripts serially against multiple database connections.
更有甚者，如果多个数据库连接单例被创建，客户端将会得到一个“多个数据库连接”的异常。
Additionally, if several instances of a database-connection singleton are created, you might start receiving SQLExceptions complaining about "too many database connections."
ActiveRecord在使用参考完整性约束的某些场合也会出现问题，因为某些类型的关联可能连接到多个数据库表。
ActiveRecord also has trouble in some cases with referential integrity constraints because some types of associations might connect to more than one database table.
为了获得这些数据，您可能需要调用Web服务、连接到数据库、执行复杂的逻辑运算或从多个数据源汇总数据。
To obtain this information, you may invoke a Web service, connect to a database, perform complex logic, or aggregate data from multiple sources.
问：在Cloudscape系统中，应用程序如何连接到多个数据库？
Q: How can an application connect to more than one database in a Derby system?
凭借联邦数据库，您可以使用单独一条sql语句连接来自多个数据源的数据，包括联邦数据库本身。
With a federated database, you can use a single SQL statement that joins data from multiple data sources, including the federated database itself.
因此，通过使用不同连接名称连接到同一个数据库，到同一个数据库的多个连接是可能实现的。
Hence, multiple connections to the same database were possible by using different connection names to connect to the same database.
由于我们的团队需要用户连接到一个数据库并设置多个jboss容器，所以我们使用面板提示用户提供特定的信息。
Because our team needed users to connect to a database and set up multiple JBoss containers, we used panels to prompt users for site-specific information.
使用IBMExplorer，您可以向同一目标DB 2服务器和数据库添加多个数据连接，每个都具有一个惟一的名称。
Using the IBM Explorer, you can add multiple data connections to the same target DB2 server and database each having a unique name.
每个Cloudscape实例可以管理多个数据库，数据库可以存储在于不同的介质上，而且，没有东西阻止应用程序连接其他DBMS系统。
Each Derby instance can manage multiple databases, the databases can live on various media, and there's nothing to stop the application from connecting to other DBMS systems.
使用的连接复用策略无法控制属于同一个事务的多个数据库操作，不能保证事务的ACID属性等。
The multi-propose connection strategy cannot control the database operation for the same transaction and cannot ensure the ACID attribute, etc.
我有一个应用程序，使几个SQL连接到多个数据库，目前需要一个很长很长的时间来执行。
I have an application that makes several SQL connections to multiple databases which currently takes a very very long time to execute.
我有一个应用程序，使几个SQL连接到多个数据库，目前需要一个很长很长的时间来执行。
I have an application that makes several SQL connections to multiple databases which currently takes a very very long time to execute.
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