7.3.3. NextGIS EasyQuery

The NextGIS EasyQuery plugin is designed for quick search and filtering of objects in vector layers. It is a simplified and intuitive visual query builder with which you can:

  • Select the desired vector layer

  • Configure simple conditions for filtering objects by attribute data

  • Define query mode

  • Save the selection result to a separate temporary layer or select it in the current vector layer

More information can be found in the “About”.

../../_images/info-en.png

Pic. 7.6. Plugin info

7.3.3.1. Unstallation

To install or update this plugin, you need to find it in the menu Plugins ‣ Manage and install plugins. Enter part or all of its name in the Search bar (см. Pic. 7.7.).

../../_images/setup-en.png

Pic. 7.7. List of installed and available plugins

Select NextGIS EasyQuery from the list and select Install Module.

After installing the extension, an icon appears on the toolbar easyquery_icon-en.

7.3.3.2. Usage

  1. Click on the icon of the installed plugin. You can also open the module through the top menu Vector ‣ NextGIS EasyQuery

  2. Select the vector layer whose features you want to query. The layers in the list are taken from the project, so the data needs to be added to QGIS beforehand.

  3. Add the condition you need - choose the field to select, the operator and the value you are looking for. There can be several conditions, you can add and remove them.

../../_images/conditions-en.png

Pic. 7.8. Adding a condition for query via the NextGIS EasyQuery plugin

  1. Set the query mode. If you set several conditions, you can specify whether at least one of them or all of them must be fulfilled at once.

../../_images/query_modes-en.png

Pic. 7.9. Query mode selection

Important

For number field types, values from the list corresponding to percentage intervals of 25%, 50%, and 75% will be suggested, not all available values in the current table field.

  1. Select the type of result you want. Objects can be either selected in the current layer or saved to a special temporary layer.

../../_images/query_type_result-en.png

Pic. 7.10. Result type selection

  1. Optionally, set the checkbox so that the query result is automatically zoomed in on the map.

  2. Start execution

../../_images/query_result-en.png

Pic. 7.11. Query result with the selection of objects in the current layer

../../_images/query_result2-en.png

Pic. 7.12. Query result with the creation of a new temporary layer