Diwakar's Blog

public class genreController : Controller
    {
        //
        // GET: /genre/
        MVCBookStoreEntities db = new MVCBookStoreEntities();

        public ActionResult Index()
        {
            //var model = db.genres.ToList();
            //return View(model);          

            List gen =new List();
            gen=db.genres.ToList();
            var model=from g in gen
                      orderby g.GenreId descending
                      where g.Status==true
                      select g;
            return View(model);
        }


        //
        // GET: /genre/Details/5

        public ActionResult Details(int id)
        {
            var model = db.genres.Find(id);
            return View(model);
        }

        //
        // GET: /genre/Create

        public ActionResult Create()
        {
            return View();
        }

        //
        // POST: /genre/Create

        [HttpPost]
        public ActionResult Create(Genre addgen)
        // public ActionResult Create(FormCollection collection)
        {
            try
            {
                // TODO: Add insert logic here
                //return RedirectToAction("Index");
                db.Entry(addgen).State = EntityState.Added;
                //db.genres.Add(addgen);
                db.SaveChanges();
                return RedirectToAction("Index");


            }
            catch
            {
                return View();
            }
        }

        //
        // GET: /genre/Edit/5

        public ActionResult Edit(int id)
        {
            var model=db.genres.Find(id);
            return View(model);
        }

        //
        // POST: /genre/Edit/5

        [HttpPost]
        public ActionResult Edit(int id, Genre editgen)
        //public ActionResult Edit(int id, FormCollection collection)
        {
                try
                {
                    if (ModelState.IsValid)
                    {
                        // TODO: Add update logic here
                        editgen.GenreId = id;
                        db.Entry(editgen).State = EntityState.Modified;
                        db.SaveChanges();
                        return RedirectToAction("Index");
                    }
                    else {
                        return RedirectToAction("Index");
                    }
                }
                catch
                {
                    return View();
                }
           
        }

        //
        // GET: /genre/Delete/5

        public ActionResult Delete(int id)
        {
            var model = db.genres.Find(id);
            return View(model);
        }

        //
        // POST: /genre/Delete/5

        [HttpPost]
        public ActionResult Delete(int id, Genre deletegen)
        {
            try
            {
                if (ModelState.IsValid)
                {
                    // TODO: Add update logic here
                    deletegen.GenreId = id;
                    db.Entry(deletegen).State = EntityState.Deleted;
                    db.SaveChanges();
                    return RedirectToAction("Index");
                }
                else
                {
                    return RedirectToAction("Index");
                }
            }
            catch
            {
                return View();
            }
        }
    }

Microsoft Visual Studio 2012

Tools
Library Package Manager
Package Manager Console

Then
PM> Install-Package EntityFramework -Pre  

required Internet Connection............

Scaffolding is a technique supported by some model-view-controller frameworks, in which the programmer may write a specification that describes how the application database may be used. The compiler uses this specification to generate code that the application can use to create, read, update and delete database entries, effectively treating the template as a "scaffold" on which to build a more powerful application.

using System;

public class Quadrilateral
{
        protected T _base;
        protected T _height;
        protected string _name;

        public virtual T Base
        {
            get { return _base; }
            set { _base = value; }
        }

        public virtual T Height
        {
            get { return _height; }
            set { _height = value; }
        }

        public virtual string Name
        {
            get { return _name; }
            set { _name = value; }
        }

        public Quadrilateral(string name = "Quadrilateral")
        {
            _name = name;
        }

        public Quadrilateral(T bs, T height)
        {
            _name = "Quadrilateral";
            _base = bs;
            _height = height;
        }

        public Quadrilateral(string name, T bs, T height)
        {
            _name = name;
            _base = bs;
            _height = height;
        }


        public virtual string Describe()
        {
            return "A quadrilateral is a geometric figure with four sides";
        }

        public virtual void ShowCharacteristics()
        {
            Console.WriteLine("Geometric Figure: {0}", Name);
            Console.WriteLine("Description:      {0}", Describe());
            Console.WriteLine("Base:             {0}", Base);
            Console.WriteLine("Height:           {0}", Height);
        }
}

public class Exercise
{
    static int Main()
    {
        // Trapezoid with equal sides
        var Kite = new Quadrilateral("Beach Kite", 18.64, 18.64);
        Kite.ShowCharacteristics();
        Console.WriteLine();

        // Rectangle, in meters
        var BasketballStadium = new Quadrilateral();
        BasketballStadium.Name = "Basketball Stadium";
        BasketballStadium.Base = 15;
        BasketballStadium.Height = 28;
        BasketballStadium.ShowCharacteristics();
        Console.WriteLine();

        return 0;
    }
}

Geometric Figure: Beach Kite
Description:      A quadrilateral is a geometric figure with four sides
Base:             18.64
Height:           18.64

Geometric Figure: Basketball Stadium
Description:      A quadrilateral is a geometric figure with four sides
Base:             15
Height:           28

Press any key to continue . . .

public class Square : Quadrilateral
{
}

using System;

public class Quadrilateral
{
        protected T _base;
        protected T _height;
        protected string _name;

        public virtual T Base
        {
            get { return _base; }
            set { _base = value; }
        }

        public virtual T Height
        {
            get { return _height; }
            set { _height = value; }
        }

        public virtual string Name
        {
            get { return _name; }
            set { _name = value; }
        }

        public Quadrilateral(string name = "Quadrilateral")
        {
            _name = name;
        }

        public Quadrilateral(T bs, T height)
        {
            _name = "Quadrilateral";
            _base = bs;
            _height = height;
        }

        public Quadrilateral(string name, T bs, T height)
        {
            _name = name;
            _base = bs;
            _height = height;
        }


        public virtual string Describe()
        {
            return "A quadrilateral is a geometric figure with four sides";
        }

        public virtual void ShowCharacteristics()
        {
            Console.WriteLine("Geometric Figure: {0}", Name);
            Console.WriteLine("Description:      {0}", Describe());
            Console.WriteLine("Base:             {0}", Base);
            Console.WriteLine("Height:           {0}", Height);
        }
}

public class Square : Quadrilateral
{
        public Square()
        {
            _name = "Square";
        }
        public Square(string name)
        {
            _name = "Square";
        }
        public Square(T side)
        {
            _name = "Square";
            _base = side;
            _height = side;
        }
        public Square(string name, T side)
        {
            _name = name;
            _base = side;
            _height = side;
        }
        public override string Describe()
        {
            return "A square is a quadrilateral with four equal sides";
        }
        public override void ShowCharacteristics()
        {
            Console.WriteLine("Geometric Figure: {0}", Name);
            Console.WriteLine("Description:      {0}", Describe());
            Console.WriteLine("                  {0}", Describe());
            Console.WriteLine("Side:             {0}", Base);
        }
}

public class Exercise
{
    static int Main()
    {
        // Rectangle, in meters
        var plate = new Square();

        plate.Name   = "Plate";
 plate.Base   = 15;
        plate.Height = 28;
 plate.ShowCharacteristics();

        Console.WriteLine();
        return 0;
    }
}

Geometric Figure: Plate
Description:      A quadrilateral is a geometric figure with four sides
                  A square is a quadrilateral with four equal sides
Side:             15

Press any key to continue . . .

From jQuery4u

Introduction

Choosing which way to declare a JavaScript function can be confusing for beginners as there are several different ways to declare functions using JavaScript/jQuery. I’ll try to explain the benefits of each one and how and why you might use them when writing your awesome jQuery code.

1. The basic JavaScript function

This is the simplest way to declare a function in JavaScript. Say for example, we want to write a simple function called multiply(x,y) which simply takes in two parameters x and y, does a simple x times y and returns the value. Here are a few ways you might go about doing exactly this.
If you wanted a quick function to test something then maybe that’s the only occasion you would use this. It’s not good coding and doesn’t promote code reuse.

2. JavaScript functions for get/set

If you need a private utility for getting/setting/deleting model values then you can declare a function as a variable like this. This could be useful for assigning a variable upon declaration calculated by a function.

3. Create your own jQuery function

This is an awesome way to declare functions that can be used just like your regular jQuery functions, on your DOM elements! Rememeber jQuery.fn is just an alias for jQuery.prototype (which just saves us time when coding such jQuery.fn.init.prototype = jQuery.fn = $.fn as such).
Don’t forget to return the element so that you can chain jQuery functions together.

4. Extend Existing jQuery Functions

(or which either extend existing jQuery functions with extra functionality or creating your own functions that can be called using the jQuery namespace (usually, we use the $ sign to represent the jQuery namespace). In this example the $.fn.each function has been modified with custom behaviour.

5. Functions in custom namespaces

If your writing functions in a custom namespace you must declare them in this way. Extra functions can be added to the namespace you just need to add a comma after each one (except the last one!). If your unsure about namespacing see jQuery Function Namespacing in Plain English

Conclusion

Knowing when and how to declare different types of JavaScript/jQuery functions is definitely something any good js developer should know inside out.

Introduction

“ A stored routine is a set of SQL statements that can be stored in the server.”

A stored procedure is a method to encapsulate repetitive tasks. They allow for variable declarations, flow control and other useful programming techniques.
The “academic” position on this is quite clear and supports the extensive use of stored procedures. On the other hand, when you consider the opinions of those who work with them day in, day out, you’ll notice that reactions vary from complete, unwavering support to utter hate. Keep these in mind.

Pros

• Share logic with other applications. Stored procedures encapsulate functionality; this ensures that data access and manipulation are coherent between different applications.
• Isolate users from data tables. This gives you the ability to grant access to the stored procedures that manipulate the data but not directly to the tables.
• Provide a security mechanism. Considering the prior item, if you can only access the data using the stored procedures defined, no one else can execute a DELETE SQL statement and erase your data.
• To improve performance because it reduces network traffic. With a stored procedure, multiple calls can be melded into one.

Cons

• Increased load on the database server — most of the work is done on the server side, and less on the client side.
• There’s a decent learning curve. You’ll need to learn the syntax of MySQL statements in order to write stored procedures.
• You are repeating the logic of your application in two different places: your server code and the stored procedures code, making things a bit more difficult to maintain.
• Migrating to a different database management system (DB2, SQL Server, etc) may potentially be more difficult.

The tool that I am working with in this tutorial, MySQL Query Browser, is pretty standard for database interactions. The MySQL command line tool is another excellent choice. I make note of this because the popular phpMyAdmin doesn’t support stored procedure execution.

Additionally, I’ll be using very rudimentary table structures, strictly to ease the explanation. I’m showing off stored procedures, and they’re complex enough without worrying about big tables.

---

Step 1 – Picking a Delimiter

The delimiter is the character or string of characters that you’ll use to tell the mySQL client that you’ve finished typing in an SQL statement. For ages, the delimiter has always been a semicolon. That, however, causes problems, because, in a stored procedure, one can have many statements, and each must end with a semicolon. In this tutorial I will use “//”

---

Step 2 – How to Work with a Stored Procedure

Creating a Stored Procedure

The first part of the statement creates the procedure. The next clauses defines the optional characteristics of the procedure. Then you have the name and finally the body or routine code.
Stored procedure names are case insensitive, and you cannot create procedures with the same name. Inside a procedure body, you can’t put database-manipulation statements.
The four characteristics of a procedure are:

• Language : For portability purposes; the default value is SQL.
• Deterministic : If the procedure always returns the same results, given the same input. This is for replication and logging purposes. The default value is NOT DETERMINISTIC.
• SQL Security : At call time, check privileges of the user. INVOKER is the user who calls the procedure. DEFINER is the creator of the procedure. The default value is DEFINER.
• Comment : For documentation purposes; the default value is ""

Calling a Stored Procedure

To call a procedure, you only need to enter the word CALL, followed by the name of the procedure, and then the parentheses, including all the parameters between them (variables or values). Parentheses are compulsory.

Modify a Stored Procedure

MySQL provides an ALTER PROCEDURE statement to modify a routine, but only allows for the ability to change certain characteristics. If you need to alter the body or the parameters, you must drop and recreate the procedure.

Delete a Stored Procedure

This is a simple command. The IF EXISTS clause prevents an error in case the procedure does not exist.

---

Step 3 – Parameters

Let’s examine how you can define parameters within a stored procedure.

• CREATE PROCEDURE proc1 () : Parameter list is empty
• CREATE PROCEDURE proc1 (IN varname DATA-TYPE) : One input parameter. The word IN is optional because parameters are IN (input) by default.
• CREATE PROCEDURE proc1 (OUT varname DATA-TYPE) : One output parameter.
• CREATE PROCEDURE proc1 (INOUT varname DATA-TYPE) : One parameter which is both input and output.

Of course, you can define multiple parameters defined with different types.

IN example

OUT example

INOUT example

---

Step 4 – Variables

The following step will teach you how to define variables, and store values inside a procedure. You must declare them explicitly at the start of the BEGIN/END block, along with their data types. Once you’ve declared a variable, you can use it anywhere that you could use a session variable, or literal, or column name.
Declare a variable using the following syntax:
Let’s declare a few variables:

Working with variables

Once the variables have been declared, you can assign them values using the SET or SELECT command:

---

Step 5 – Flow Control Structures

MySQL supports the IF, CASE, ITERATE, LEAVE LOOP, WHILE and REPEAT constructs for flow control within stored programs. We’re going to review how to use IF, CASE and WHILE specifically, since they happen to be the most commonly used statements in routines.

IF statement

With the IF statement, we can handle tasks which involves conditions:

CASE statement

The CASE statement is another way to check conditions and take the appropriate path. It’s an excellent way to replace multiple IF statements. The statement can be written in two different ways, providing great flexibility to handle multiple conditions.
or:

WHILE statement

There are technically three standard loops: WHILE loops, LOOP loops, and REPEAT loops. You also have the option of creating a loop using the “Darth Vader” of programming techniques: the GOTO statement. Check out this example of a loop in action:

---

Step 6 - Cursors

Cursor is used to iterate through a set of rows returned by a query and process each row.

MySQL supports cursor in stored procedures. Here's a summary of the essential syntax to create and use a cursor.
In this example, we'll perform some simple operations using a cursor:
Cursor has three important properties that you need to be familiar with in order to avoid unexpected results:

• Asensitive : Once open, the cursor will not reflect changes in its source tables. In fact, MySQL does not guarantee the cursor will be updated, so you can't rely on it.
• Read Only : Cursors are not updatable.
• Not Scrollable : Cursors can be traversed only in one direction, forward, and you can't skip records from fetching.

---

Conclusion

In this lesson, we covered the fundamentals of stored procedures and some specific properties pertaining to them. Of course, you should continue your studies in areas like security, SQL statements, and performance before you can master MySQL routines.
You have to evaluate the advantages that stored procedures can potentially bring to your applications, and then make a reasonable implementation that fits your requirements. I generally use procedures; their benefits in terms of security, code maintenance and software design make them worthy of use, in my opinion. Additionally, remember that procedures in MySQL are still a work in progress. You should fully expect improvements, in terms of functionality and performance in the future. Please don't hesitate to comment and share your ideas and opinions.