允许在没有数据库连接的情况下使用保存的模型。
Let you work with a disconnected, saved model for the database connection.
而link则可被设为对现有数据库连接或对象的一个引用。
You can set link as a reference to an existing database connection link or object.
对于典型的J2EE应用程序，会对所有数据库访问使用单个连接池标识。
With typical J2EE applications, a single connection pool identity is used for all database access.
对于典型的J2EE应用程序，会对所有数据库访问使用单个连接池标识。
With typical J2EE applications, a single connection pool identity is used for all database access.
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