The QueryTask is no exception. It involves working with a series of objects to provide input to the task, execute the task, and dealing with the returned results. The input parameters for an attribute or spatial query are stored in a Query object that describes the nature of the query you want to perform. The QueryTask object executes the task using the information provided in the Query object. The results are returned in the form of a FeatureSet object. This contains an array of Graphic features which you can then display on the map.
The Query object, used as input to a QueryTask, contains properties including geometry, where, and text.
The geometry property is used to provide a geometry to use for a spatial query and is either a point, line, or polygon.
The where property is used to define an attribute query while the text property is used to perform a SQL WHERE field_name LIKE value query.
Other Query object properties include the ability to subset...