Query by criteria: Query the database by creating a criteria object and setting its properties.
Query by criteria：通过创建criteria对象查询数据库。
When you develop a business process client program, you often need to query process instances, activities, and tasks within a certain process instance by certain business data criteria.
在您开发一个业务流程客户端程序时，您经常需要在一个流程实例内，通过某些业务数据标准来查询流程实例、活动和任务。
It's important to note that if invoked without any criteria, the query in listing 6 will return all approved and valid listings, ordered by date.
重要的是要知道，如果没有使用任何标准调用，清单6中的查询将返回所有已批准和有效的清单，并按日期排序。
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