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System and method for providing user defined types in a database system

  • US 20050177585A1
  • Filed: 02/14/2005
  • Published: 08/11/2005
  • Est. Priority Date: 02/10/2004
  • Status: Active Grant
First Claim
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1. A method for creating a user-defined type in a database system, comprising:

  • receiving code that implements a class defining the structure of a user-defined type and methods that can be invoked on instances of the user-defined type;

    enforcing a contract against the class, the contract comprising;

    a first requirement that the class specify one of a plurality of different formats for persisting instances of the user-defined type in a database store;

    a second requirement that the class be capable of returning a null value for the user-defined type; and

    a third requirement that the class provide a method for converting the user-defined type to another type; and

    enabling instances of the user-defined type to be created only when the class meets the requirements of the contract.

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