Data Model Editor

Entities page

This page describes entities participating in the data model and their attributes.

About Data Model Editor

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

Pages class

Contains the settings for the default pages from EasyQuery Razor UI library

Pages class

Contains the settings for the default pages from EasyQuery Razor UI library

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:

Value Editors

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

Operators page

This article defines operators which can be used in conditions (such as 'is equal to', 'less than' and others).

Navigate through data model entities and attributes

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

Entity class

Represents one entity

Tables and links page

Learn how to work with tables and links within your Data Model, change and edit them.

Entity class

Represents one entity

Entity class

Represents one entity

Paging in query results

Paging can make your work with query more convenient. And here is detailed instruction on how to use it.

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)..

Hide some entities and/or attributes

Here we explain how to implement different ways to limit the quantity of entities and attributes shown in Data Model

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.

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 DB meta-information

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