测试连接，确保已连接到数据库。
Test the connection to verify that you can connect to the database.
一旦应用程序连接到联合数据库，就能访问联合数据库中的所有已授权对象。
Once an application is connected to the federated database, it can access all authorized objects in the federated system.
该脚本连接到数据库，并使用已发布的user和message字段存储消息。
This script connects to the database and stores the message using the posted user and message fields.
确保已连接到要在其中创建表的数据库。
Make sure you are connected to the database in which you want to create the table.
确保已连接到要在其中创建表的数据库。
Make sure you are connected to the database in which you want to create the table.
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