Generate Key In Db View

After you create a container with a unique key policy, the creation of a new or an update of an existing item resulting in a duplicate within a logical partition is prevented, as specified by the unique key constraint. The partition key combined with the unique key guarantees the uniqueness of an item within the scope of the container. Device simulator writes JSON data to Cosmos DB into raw collection. Such data is exposed by Cosmos DB Change Feed and consumed by an Azure Function (via Change Feed Processor), that get the JSON document and uses it to create or updated the related materialized views, stored in the view collection. Change feed in Azure Cosmos DB. A key is a column or an ordered collection of columns that is identified in the description of a table, an index, or a referential constraint. Keys are crucial to the table structure in a relational database. Keys are important in a relational database because they ensure that each record in a table is uniquely identified, they help establish and enforce referential integrity, and they establis. Question: What do I query to get the 'alter table' statements to display the foreign key DDL?I want a dictionary query to display all foreign keys for all tables. How do I generate a display of the foreign keys? I do not wish to use dbmsmetadata.

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This sample shows how materialized view can be kept updated in near-real time using a completely serverless approach with

  • Azure Function
  • Cosmos DB
  • Cosmos DB Change Feed

The high-level architecture is the following one:

Device simulator writes JSON data to Cosmos DB into raw collection. Such data is exposed by Cosmos DB Change Feed and consumed by an Azure Function (via Change Feed Processor), that get the JSON document and uses it to create or updated the related materialized views, stored in the view collection.

A more detailed discussion on the architecture and solution can be found here:

The sample simulates one or more IoT Devices whose generated data needs to be sent, received and processed in near-real time. In this context, 'processed' means:

  • Provide, for each device, the sum of the sent value data and also the last sent value
  • Provide one view with all devices and the last data sent by each one

Sample data

The simulated IoT devices will send this sample data:

Processed data

The resulting processed data for each device will look like the following document:

The document contain aggregated data for the device specified in id, as long as the aggregated value in aggregationSum and the last sent value in the lastValue field.

The global materialized view is where the last value for each device is stored:

Values are updated in near-real time by using the Change Feed feature provided by Cosmos DB. The sample is using processing data coming from the Change Feed every second, but it can easily changed to a much lower value if you need more 'real time' updates.

Implementation Notes

Data is partitioned by deviceId in both the raw and view collection to make sure order is preserved within data sent by a single device. Collections do not use indexing as only point-lookups are done and since in this sample Cosmos DB is used a key-value store, switching off indexing allows to spare RUs.

Prerequisites

If you don't have an Azure subscription, create a free account before you begin.

In addition:

  • Visual Studio 2017 or Visual Studio Code

Getting Started

Make sure you have WSL (Windows System For Linux) installed and have AZ CLI version > 2.0.50. Before running any script also make sure you are authenticated on AZ CLI using

and have selected the Azure Subscription you want to use for the tests:

Clone the sample project

Clone the repository and open the code-samples directory from your command line tool.

Create Azure Resources

To create and configure the Azure Resources needed for the project, you just have to run the deploy.sh script in the script folder.

Script has been tested on Mac OSX and Ubuntu Bash.

The following resources will be created:

  • Resource Group
  • Azure Storage
  • Azure Function (using Consumption Plan)
  • Application Insight
  • Cosmos DB with 3 Collections (raw and view with 1000 RU each, leases with 400 RU)

By default all deployed resources will have the mvsample prefix and the location will be eastus. If you don't have any specific naming requirements, by default the generated ROOT_NAME will be uniquified by postfixing random numbers to make sure you don't have any name collision with someone else trying the sample at the same time. Bid whist download for mac.

If needed you can change the following defauly settings

in ./script/deploy to make sure they work for you.

Run the Producer application

The producer application will generate sample sensor data as described before. The application takes the device ids to generate as parameter:

The above sample will generate random data for device id 001. If you want to generate more data just specify how many sensor you need to be simulated:

will generate data for 10 sensors, from 001 to 010. If you want to generate more workload and you're planning to distribute the work on different clients (using Azure Container Instances or Azure Kubernetes Service for example), you'll find useful the ability to specify which device id range you want to be generated by each running application. For example

will generate data with Device Ids starting from 015 up to 025.

Docker Image

If you want to build and run the simulator using Docker, just run build.bat to build the docker image. The run it using

to simulate device from 001 to 010, for example.

Check results

Key

Once the producer is started you can see the result by using Azure Portal or Azure Storage Explorer to look for document create int the view collection of the created Cosmos DB database.

You can also take a look at the Application Insight Live Metric Streams to see in real time function processing incoming data from the Change Feed

Additional Reference

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Using MVC, Entity Framework, and ASP.NET Scaffolding, you can create a web application that provides an interface to an existing database. This tutorial series shows you how to automatically generate code that enables users to display, edit, create, and delete data that resides in a database table. The generated code corresponds to the columns in the database table.

This tutorial focuses on using ASP.NET Scaffolding to generate the controllers and views.

In this tutorial, you:

  • Add scaffold
  • Add links to new views
  • Display student views
  • Display enrollment views

Prerequisite

Add scaffold

You are ready to generate code that will provide standard data operations for the model classes. You add the code by adding a scaffold item. There are many options for the type of scaffolding you can add; in this tutorial, the scaffold will include a controller and views that correspond to the Student and Enrollment models you created in the previous section.

To maintain consistency in your project, you will add the new controller to the existing Controllers folder. Right-click the Controllers folder, and select Add > New Scaffolded Item.

Select the MVC 5 Controller with views, using Entity Framework option. This option will generate the controller and views for updating, deleting, creating and displaying the data in your model.

Select Student (ContosoSite.Models) for the model class and select the ContosoUniversityDataEntities (ContosoSite.Models) for the context class. Keep the controller name as StudentsController.

Click Add.

If you receive an error, it may be because you did not build the project in the previous section. If so, try building the project, and then add the scaffolded item again.

After the code generation process is complete, you will see a new controller and views in your project's Controllers and Views > Students folders.

Perform the same steps again, but add a scaffold for the Enrollment class. When finished, you have an EnrollmentsController.cs file, and a folder under Views named Enrollments with the Create, Delete, Details, Edit and Index views.

Add links to new views

To make it easier for you to navigate to your new views, you can add a couple of hyperlinks to the Index views for students and enrollments. Open the file at Views > Home > Index.cshtml, which is the home page for your site. Add the following code below the jumbotron.

For the ActionLink method, the first parameter is the text to display in the link. The second parameter is the action and the third parameter is the name of the controller. For example, the first link points to the Index action in StudentsController. The actual hyperlink is constructed from these values. The first link ultimately takes users to the Index.cshtml file within the Views/Students folder.

Display student views

You will verify that the code added to your project correctly displays a list of the students, and enables users to edit, create, or delete the student records in the database.

Right-click the Views > Home > Index.cshtml file, and select View in Browser. On the application home page, select List of students.

On the Index page, notice the list of the students and links to modify this data. Select the Create New link and provide some values for a new student. Click Create, and notice the new student is added to your list.

Back on the Index page, select the Edit link, and change some of the values for a student. Click Save, and notice the student record has been changed.

Finally, select the Delete link and confirm that you want to delete the record by clicking the Delete button.

/proshow-producer-8-registration-key-generator.html. Without writing any code, you have added views that perform common operations on the data in the Student table.

You may have noticed that the text label for a field is based on the database property (such as LastName) which is not necessarily what you want to display on the web page. For example, you may prefer the label to be Last Name. You will fix this display issue later in the tutorial.

Display enrollment views

Your database includes a one-to-many relationship between the Student and Enrollment tables, and a one-to-many relationship between the Course and Enrollment tables. The views for Enrollment correctly handle these relationships. Navigate to the home page for your site and select the List of enrollments link and then the Create New link.

The view displays a form for creating a new enrollment record. In particular, notice that the form contains a CourseID drop-down list and a StudentID drop-down list. Both are populated with values from the related tables.

Furthermore, validation of the provided values is automatically applied based on the data type of the field. Grade requires a number, so an error message is displayed if you try to provide an incompatible value: The field Grade must be a number.

You have verified that the automatically-generated views enable users to work with the data in the database. In the next tutorial in this series, you will update the database and make the corresponding changes in the web application.

Next steps

View Db File

In this tutorial, you:

How To View Db Files

  • Added scaffold
  • Added links to new views
  • Displayed student views
  • Displayed enrollment views

Generate Key In Db View Free

Advance to the next tutorial to learn how to change the database.