Table of Contents

Introduction


If you are new to Angular 5 and ASP.NET Core, then kindly read our previous article.

In our previous article, We have explained how to get started with Angular 5 and ASP.NET Core. Now, in this article, let's see in depth how to work with WEB API, EF for performing a CRUD operation for Angular 5 and ASP.NET Core application.

For performing CRUD operation here, We have taken the concept as Inventory Management priority based Reorder level system.

Inventory management and Reorder Level

Inventory management is very important to maintain and manage the stocks in small shops or in a big warehouse. For example, let’s consider a small shop where they sell items like Tooth Paste, Soap, Shampoo, etc. For all the items in the shop, they will make a list with the item name and they will add the total available stock quantity for each item, Total Sales quantity per item and Total Quantity received to be added in the stock. If the items are small in number, it will be easy to find the items needed to be purchased again to maintain the stock quantity, consider if it’s a big factory and needs to maintain all the stock quantity. Using Inventory Management software, the end user can easily track Inventory items, Total available Stock Quantity, Total Arrived and Issued Stock Quantity, Reorder Level for each item, Reorder Date for each Item and priority based reorder for the items which need to be stocked immediately.

Reorder Level

In Inventory Management Reorder Level or Point is an important part which will be used to indicate the customer as this item Stock is going to be finished and need to be purchased or produced for sales or delivered to the end user.

Inventory Management has many processes to be taken care of to maintain the software. In this article, we will make a simple project to display the web-based Monitoring system for indicating the priority based Inventory Management Reorder System.

For Reorder Level there has to be some formula for displaying the indicator on each item which needs to be stocked. In our simple project, We have used the type of Priority-based indication to the customer as manual and automatic.

Note: In Inventory Management we will be having Item Master table, Item Detail Table, Inventory tables and etc. For this simple project, We have used only one table as Inventory table and added the Item Name directly with Stock Qty, Reorder Qty and Priority Status, Using the Priority status user can add or edit the priority for each item which needs to be stocked immediately. Here priority Status is to manually add or edit the priority for each item which needs to be stocked.

Manual Priority setting for Reorder Level

When a customer adds /edits each Inventory item they can set manually priority for reordering the stock. If you ask me what this means, Consider a case where we have 1000 stock in Samsung S7 Edge Item and let's consider this stock can be used for two months. But there is a high demand for the Samsung S7 Edge phone and the price will be increased after a week and now we need to immediately increase the stock quantity. We have many branches around the world by editing the stock priority all our branches can view this from our web application and add the stock to the priority item; or let’s consider one more example as we have 1000 quantity stock and our customer makes a phone call and asks us to deliver 5000 stock quantity within a couple of days, in this case, the manual priority will be more useful. Like this, in many scenarios, it's good to have a manual priority for maintaining each item stock. This is a simple demo project so we didn’t add many field examples. We can also add the field like reorder date until we need to increase the stock quantity and notes for priority etc.

Now let’s add a new Item to our Inventory and click Save. Here we didn’t check the Priority Status while adding new Item, which means this item has good stock Quantity and it's not required for now to add more stock quantity.

We can see as the Priority Status Column with red and green color with Checked and unchecked boxes. When we add or edit the item if we have checked the Priority Status and saved then the item column will be displayed in green along with checkbox image. If the Item is not saved with priority status then it displays with red color. Here we used the green color to indicate the customer as this item has high priority and stock item needs to be increased with new Reorder Qty.

Now let’s edit the item and set the item with priority status.

When we save the same item with Priority Status checked, we can see the indicator with Green Color along with the Checked image.

Automatic Priority Status for Reorder Level

As we already told you, for reorder level we will be using the formula to indicate the customer for increasing the stock quantity with new reorder quantities.

Here we can see the Required Priority Status Column with Sky Blue and Light Green Color. Light Blue color indicates the Item is not needed for reordering and the Green color indicates the Item needs to be reordered.

For the automatic display we have set the formula as if StockQty>ReorderQty+50 then set the Required Priority Status as Light Blue Color which indicates the customer as the item is not needed for reorder and the if StockQty<=ReorderQty+50 then set the Required Priority Status as Light Green Color which indicates the customer as the item needed for immediate stock maintenance.

From the above image for the newly added Samsung S7 Edge Item Stock Qty is 750 and Reorder Qty is 50 so the Required Priority Status is displayed as blue color.
Now let’s edit the item like below and set the Reorder Quantity as 700 and save to check the changes.

Here now we can see the Required Priority Status color has been automatically changed as the Stock Qty is 750 and the Reorder Qty is 700.

Now let's see how to create this web application using Angular5,ASP.NET Core using EF and Web API.

Prerequisites

Make sure you have installed all the prerequisites on your computer. If not, then donents-files/00-00-00-00-05/5466.7.png" style="border-width:0px;border-style:solid;" />

Here now we can see the Required Priority Status color has been automatically changed as the Stock Qty is 750 and the Reorder Qty is 700.

Now let's see how to create this web application using Angular5,ASP.NET Core using EF and Web API.

  • First, download and install Visual Studio 2017 from this link.
  • Download and install .NET Core 2.0
  • Download and install Node.js v9.0 or above. I have installed V9.1.0 (Download link).

    • Code part

    Now, it’s time to create our first Angular5 and ASP.NET Core application.

    Step 1 - Create a database and a table

    We will be using our SQL Server database for our WEB API and EF. First, we create a database named InventoryPDB and a table as InventoryMaster. Here is the SQL script to create a database table and sample record insert query in our table. Run the query given below in your local SQL Server to create a database and a table to be used in our project.

    USE MASTER     
    GO     
           
    -- 1) Check for the Database Exists .If the database is exist then drop and create new DB     
    IF EXISTS (SELECT [name] FROM sys.databases WHERE [name] = 'InventoryPDB' )     
    DROP DATABASE InventoryPDB     
    GO     
           
    CREATE DATABASE InventoryPDB     
    GO     
           
    USE InventoryPDB     
    GO     
           
           
    -- 1) //////////// StudentMasters     
           
    IF EXISTS ( SELECT [name] FROM sys.tables WHERE [name] = 'InventoryMaster' )     
    DROP TABLE InventoryMaster     
    GO     
           
    CREATE TABLE [dbo].[InventoryMaster](     
            [InventoryID] INT IDENTITY PRIMARY KEY,     
            [ItemName] [varchar](100) NOT NULL,        
            [StockQty]  int NOT NULL,        
            [ReorderQty] int NOT NULL,        
            [PriorityStatus] int NOT NULL     -- 0 for low and 1 for High  pan>
            [ItemName] [varchar](100) NOT NULL,        
            [StockQty]  int NOT NULL,        
            [ReorderQty] int NOT NULL,&n
    )     
           
    -- insert sample data to Student Master table     
    INSERT INTO [InventoryMaster]   ([ItemName],[StockQty],[ReorderQty],[PriorityStatus])     
         VALUES ('HardDisk',500,300,0)     
           
    INSERT INTO [InventoryMaster]   ([ItemName],[StockQty],[ReorderQty],[PriorityStatus])     
         VALUES ('Mouse',600,550,1)  
      
         INSERT INTO [InventoryMaster]   ([ItemName],[StockQty],[ReorderQty],[PriorityStatus])     
         VALUES ('USB',3500,3000,0)  
                           
         select * from InventoryMaster

    Step 2- Create Angular5TemplateCore

    After installing all the prerequisites listed above and Angular5TemplateCore, click Start >> Programs >> Visual Studio 2017 >> Visual Studio 2017, on your desktop. 

    Click New >> Project. Select Visual C# >> Select Angular5Core2. Enter your project name and click OK.


    Once our project is created we can see in solution explorer with Angular5 sample components, HTML and app in ClientApp Folder along with Asp.NET Core Controllers and view folder.

    Package.json File

    If we open the package.json file, we can see all the dependencies needed for Angular 5 and the Angular CLI has already been added by default.

    Adding Webpack in Package.json

    In order to run our Angular 5 application, we need to install the webpack in our application. If the webpack is by default not added to our package.json file, then we need to add it manually. Webpack is an open-source JavaScript module bundler. It takes modules with dependencies and generates static assets representing those modules. To know more about Webpack, click here Jump .
    Open your package.json file and add the below line under scripts.

    Step 3 – Working with Model and Context Class

    Adding connection string

    To add the connection string with our SQL connection, open the “appsettings.json” file. Yes, this is a JSON file and this file looks as shown below.

    In this appsettings.json file, have added the connection string.

    "ConnectionStrings": {  
        "DefaultConnection": "Server=SQLSERVERNAME;Database=InventoryPDB;user id=SQLID;password=SQLPWD;Trusted_Connection=True;MultipleActiveResultSets=true;"  
      }
    Next: connection Step is to create a folder named Data to create our model and DBContext class.  

    Creating Model class for Inventory

    We can create a model by adding a new class file in our Data folder. Right Click Data folder and click Add>Click Class. Enter the class name as InventoryMasters and click Add. Now, in this class, we first create a property variable, add InventoryMaster. We will be using this in our WEB API controller.Note that here we will be adding the filed name same as our Database table column names.

    using System;
    using System.Collections.Generic;
    using System.ComponentModel.DataAnnotations;
    using System.Linq;
    using System.Threading.Tasks;
      
    namespace Angular5Core2.Data
    {
        public class InventoryMaster
        {
            [Key]
            public int InventoryID { get; set; }
      
            [Required]
            [Display(Name = "ItemName")]
            public string ItemName { get; set; }
      
            [Required]
            [Display(Name = "StockQty")]
            public int StockQty { get; set; }
      
            [Required]
            [Display(Name = "ReorderQty")]
            public int ReorderQty { get; set; }
      
            public int PriorityStatus { get; set; }
        }
    }

     Creating Database Context

    DBContext is Entity Framework class to establish a connection to the database

    We can create a DBContext class by adding a new class file in our Data folder. Right-click Data folder and click Add > click Class. Enter the class name as InventroyContext and click Add. In this class, we inherit DbContext and created Dbset for our students' table.

    using Microsoft.EntityFrameworkCore;  
    using System;  
    using System.Collections.Generic;  
    using System.Linq;  
    using System.Threading.Tasks;  
        
    namespace Angular5Core2.Data  
    {  
        public class InventoryContext : DbContext  
        {  
            public InventoryContext(DbContextOptions<InventoryContext> options)    
                :base(options) { }  
            public InventoryContext() { }  
            public DbSet<InventoryMaster> InventoryMaster { get; set; }  
        }  
    }

    Startup.CS

    Now, we need to add our database connection string and provider as SQL SERVER. To add this, we add the code given below in Startup.cs file under ConfigureServices method. 

    public void ConfigureServices(IServiceCollection services)  
            {  
                // Add Entity framework .    
                services.AddDbContext<InventoryContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));  
                services.AddMvc();  
            }

    Step 4 - Creating Web API for CRUD operation

    To create our WEB API Controller, right-click Controllers folder. Click Add >> Click Controller. Select API Controller Empty and click Add button to create our Web API.

    Enter the name as “InventoryMasterAPI.cs” and click Add.

    As we all know, Web API is a simple and easy way to build HTTP Services for the Browsers and Mobiles.

    Web API has four methods given below as Get/Post/Put and Delete.

    • Get is to request the data. (Select)
    • To create our WEB API Controller, right-click Controllers folder. Click Add >> Click Controller. Select API Controller Empty and click Add button to create our Web API.

      Enter the name as “InventoryMasterAPI.cs” and click Add.

      Post is to create a data. (Insert)

    • Put is to update the data.
    • Delete is to delete data.

    First, we create the object for DBContext in our Web API class.

    [Produces("application/json")]  
        [Route("api/InventoryMasterAPI")]  
        public class InventoryMasterAPIController : Controller  
        {  
            private readonly InventoryContext _context;  
        
            public InventoryMasterAPIController(InventoryContext context)  
            {  
                _context = context;  
            }

     Get Method (Select Operation)

     Get Method is to request single item or list of items from our selected database. Here, we will get all Inventory information from InventoryMasters table.   

    // GET: api/InventoryMasterAPI  
        
        [HttpGet]  
        [Route("Inventory")]  
        public IEnumerable<InventoryMaster> GetInventoryMaster()  
        {  
            return _context.InventoryMaster;  
        
        }

     Post Method (Insert Operation)

     Post Method will be used to insert the data into our database. In Post Method, we will also check if Inventory Id is already created and return the message. We will pass all inventory Master Column parameters to be inserted into the Inventory Master table. 

        }

     Post Method (Insert Operation)

     Post Method will be used to insert the data into our database. In Post Method, we will also check if Inventory Id is already created and return the message. We will pass all inventory Master Column parameters to be inserted into the Inventory Maiv style="background-color:#ffffff;">// POST: api/InventoryMasterAPI