Data Model Editor

About Data Model Editor

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

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:

How it works

The above scheme shows the general internal structure of the library and the main principles of its work. EasyQuery components All EasyQuery classes and components can be divided into two main parts: logical part (DataModel, Query, SqlQueryBuilder). the visual part (QueryPanel, ColumnsPanel, etc.). The logical part is responsible for the internal representation of data structures and user

Getting Started

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)..

Aggregate data

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

Working with data models in EasyQuery

This article will guide you through all issues about working with data models in EasyQuery library. How to load it from the DbContext or from your DB connection, or now to create a new one using Data Model Editor.

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.

Navigate through data model entities and attributes

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

Value Editors

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

Building data model dynamically by DB meta-information

It's easier to fill your model right in the code directly from your database, using meta-information

Creating data model dynamically with code

-Data Model- object is an essential part of EasyQuery framework. However, sometimes you need to add some entities, entity attributes or operators to the existing model or to fill it from scratch using DB metadata information got from another source. In these cases, you can use EasyQuery API to build the model dynamically. Finally, we add entities and entity attributes. Here is an example of creatin a small data model: two tables (Customers and Orders) with one link between them, 2 entities (Customer and Order correpondingly) and a few attributes in each entity.

Building data model dynamically by information from a DataTable

Example of how to build data model by certain information from DataTable

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

Getting started for WPF

You will be able to apply EasyQuery WPF to your application, performing all the instructions in this article

Getting started for Silverlight

This article will guide you through all steps necessary to apply EasyQuery.NET to your application, with extract examples

Working with table aliases

In this article, we provide all the information needed to use aliases properly. There is an explanation, what for aliases are in the DME and an example of using it.

Getting started for WPF

Getting started tutorial on how to use EasyQuery components to implement an ad-hoc query builder in WPF application.

Getting started for Windows Forms

This article shows how to apply EasyQuery.NET to your application