Data Model Editor

Value Editors

Here you can find the full list of editors and choose any you need in your work with Data Model:

About Data Model Editor

Here you can find detailed information about this instrument and guideline, how to use it to perform all needed tasks.

Setup custom value editor — WinForms

Here you can find all steps you need to perfom

Processing custom value editors in EasyQuery JS

Here you can find tips how to value editor setup and how to value editor widget

Introduction to value editors

For example, value editor allows you to define a list of available values - so your users will be able to select the value from a drop-down list. "Custom list" value editor raises an event which can be processed either on the client-side or on the server. All other editions of EasyQuery (WinForms, WebForms, WPF or Silverlight) has ListRequest event in QueryPanel control which is raised when a user adds an attribute (or operator) with Custom List or SQL list value editor assigned to that attribute/operator. Here we show how you can filter the returned list according to the value specified for some other attribute. If such condition is defined - we get the value (country code) from it and use that value as a filter for the list of regions.

Data Model

In short (and by its name), data model - is a model (representation) of some data stored in your database. It solves two major problems: Presents the data to the end user in a more friendly and familiar way. Contains some meta information that helps EasyQuery components to build query statements in SQL or other query languages. Any data model contains the following main sections:

Processing custom value editors in EasyQuery JS

First, of you will need to assign a custom (user-defined) value editor for some attribute or operator in your data model. You have to ways to do it: Run Data Model Editor (DME). Select an entity attribute which you want to assign custom value editor to. You can add a custom editor to any entity attribute in your model at run-time. Here is an example of very simple value editor in TypeScript.

How to setup SQL LIST value editor in WinForms app

Step-by-step instruction how to setup SQL LIST value editor.

Korzh.EasyQuery.WinForms

EasyQuery Windows Forms controls

Aggregate data

From this article you will see how to aggregate (count, sum, etc.) data in your queries.

Working with several data models

All EasyQuery demos works with one data model (and one database which corresponds to that model). Here we are going to describe how to add a selector that switches between two data models on your view/page and then how to setup a custom "model loader" to handle GetModel requests propertly. To make it possible to switch between these two models we need some selector element on our page. The only problem here - is to switch the database connection accordingly the the switches between the models. Now when the user selects an item in our model selector element on the client-side - our server-side code automatically loads the selected model and connects to a proper database (when necessary)..

Korzh.EasyQuery.WinForms.ModelEditor

EasyQuery Model Editor controls for Windows Forms

Korzh.EasyQuery.WinForms namespace

Customizing common SQL clauses

This article is about settings for adding different options to the whole query (like DISTINCT, LIMIT, etc)

Possible ways of data model creation and loading

EasyQuery components need a [data model](/$aid/03bc06b0-83ec-4040-97ef-a50ca004177f) (a user-friendly representation of your DB) for their work. There are several different ways to create the model and load it on your project's startup. This article will describe all of them in detail.

Replace "value" element in QueryPanel's conditions — WinForms

Here is a step-by-step description what you need to achieve this goal

Navigate through data model entities and attributes

A code snippet which demonstrates how to run through data model entities and attributes

Adding a new operator to your data model

Here you can find all information about how to add a new operator to your data model either using Data Model Editor (DME) or with a code

Upgrading to 5.x: WinForms and WPF projects

This tutorial describes how to modify your old Windows Forms or WPF project with EasyQuery 3.x to upgrade to EasyQuery version 5.2.0 (or higher). Please note. Version 5.2.0 of EasyQuery works only on .NET Framework 4.6.1 or higher. So, if your project targets a lower version of .NET Framework - you will need to update Target Framework for your project first (right-click on the project in Solution