arcgis javascript definition query
This sample demonstrates how to use layer definitions with feature layers to limit the information that gets displayed on the map. Tooltips for each feature are also displayed as you mouse over the map. The tooltips are created using dojo's TooltipDialog dijit. Supports pagination in a query layer. UseresultOffset and resultRecordCount parameters to page through a query result. Note that when you pass in one of these two parameters and orderByFields is left empty, the map service uses the object-id field to sort the result. Building a query expression. Query expressions are used in ArcGIS to select a subset of features and table records. Query expressions in ArcGIS adhere to standard SQL expressions. For example, you use this syntax using the Select By Attributes tool or with the Query Builder dialog box to set a layer definition query. The Query widget serves as a query builder during configuration, allowing you to define the query by specifying source data, filters, and displaying fields in query results. Each query works with a single layer. However, you can define multiple queries for a single app, and data layers can be from multiple sources. Steps: 1  On the New Query Layer dialog box, specify a name in the Name text box for the query layer that will be created. 2  Enter an SQL query into the Query text box. 3  Once the query is created, it must be validated.  If your query is successfully validated, click Finish to add the result set to ArcMap as a query layer. Prior to 10.0, the query operation could only be performed on layers. From 10.0 onward, the query operation can be performed on tables and layers. Querying annotation is supported at the layer level, however querying annotation at the sublayer level is not supported. Note that all parameters related to geometry will be ignored when querying tables. Click Set under Attribute criteria to define a where clause for the query. Click Add a filter expression to display the expression builder. The filter expression can be a value-based operation or an operation between two fields. Select a query field—an expression—and provide a value in the text box. See ArcGIS Online ArcGIS Sever web services for more information. 1  Click the radio button next to a data source. 2  Select a layer from the list. 3  Click OK to close the Set Data Source window and return to the query configuration window.  Specify the title and icon for the query 1  task. Click the Filters  tab. Displaying a subset of features in a layer. When you specify a dataset that you want to draw as a map layer, you often only want to draw some of the features in the dataset. In these situations, you can define a query expression to select a subset of features for the layer display. This is referred to as a definition query. If your map has Data Driven Pages enabled, you can use Page Definition Queries to specify which features of a layer are drawn based on an SQL query. Though similar to other definition queries, page definition queries differ in that they only work with Data Driven Pages and are dynamic.
Query expressions are used in ArcGIS to select a subset of features and table records. Query expressions in ArcGIS adhere to standard SQL expressions.