Feel the characteristics of Java data object JDO 2.0 query language (3)
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Java
The query feature extended by manufacturers JDO manufacturers can provide jdoql with a variety of special query functions. Each vendor can define a set of its own extended functions. If you need to use the functions, you need to add the manufacturer's extensions to the program running environment. Each extension has a name and an optional value. You can set each extension individually or multiple extensions at once. The following methods of query are used to set vendor extension properties:
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