代码说明： 允许最终用户定义请求和过虑数据集 Query and filter builder. The component allows end-users to define queries and filters for single datasets and groups of datasets linked as master-detail or differently. It automatically substitutes the dataset for the generated query and vice versa; may set a filter to the dataset in simple cases. Defining conditions in a special dialog window, user may easily define any extracts of information. Information can be saved to stream, database or disk. The component is simple in use, it needs only to set DataSource and call the Execute method

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