SQL

stored procedure sql

-- without parameters; create
CREATE [OR ALTER] PROCEDURE <pname>
AS
BEGIN
<PROCEDURE BODY/ STATEMENTS>
END

-- call procedure
EXECUTE / EXEC <pname>;
(OR)
EXECUTE / EXEC <pname> VALUE / (S)

Explain the Stored Procedure

Stored Procedure :
A stored procedure is a prepared SQL code that you can save, 
so the code can be reused over and over again.

So if you have an SQL query that you write over and over again, 
save it as a stored procedure, and then just call it to execute it.

You can also pass parameters to a stored procedure, 
so that the stored procedure can act based on the parameter value(s) 
that is passed.

sql procedure

CREATE OR REPLACE PROCEDURE my_scheme.my_procedure(param1 IN VARCHAR2) IS
    cnumber NUMBER;
BEGIN
    cnumber := 10;
    INSERT INTO my_table (num_field) VALUES (param1 + cnumber);
    COMMIT;
EXCEPTION
    WHEN OTHERS THEN
        raise_application_error(-20001, 'An error was encountered - '
            || sqlcode || ' -ERROR- ' || sqlerrm);
END;

stored procedure sql

-- without parameters; create
CREATE [OR ALTER] PROCEDURE <pname>
AS
BEGIN
<PROCEDURE BODY/ STATEMENTS>
END

-- call procedure
EXECUTE / EXEC <pname>;
(OR)
EXECUTE / EXEC <pname> VALUE / (S)

stored procedure

CREATE TABLE Products
(
    Id INT IDENTITY PRIMARY KEY,
    ProductName NVARCHAR(30) NOT NULL,
    Manufacturer NVARCHAR(20) NOT NULL,
    ProductCount INT DEFAULT 0,
    Price MONEY NOT NULL
);

--1
GO
CREATE PROCEDURE AddProduct
    @name NVARCHAR(20),
    @manufacturer NVARCHAR(20),
    @count INT,
    @price MONEY
AS
INSERT INTO Products(ProductName, Manufacturer, ProductCount, Price) 
VALUES(@name, @manufacturer, @count, @price)

DECLARE @prodName NVARCHAR(20), @company NVARCHAR(20);
DECLARE @prodCount INT, @price MONEY
SET @prodName = 'Galaxy C7'
SET @company = 'Samsung'
SET @price = 22000
SET @prodCount = 5 
EXEC AddProduct @prodName, @company, @prodCount, @price 
SELECT * FROM Products

--2
GO
CREATE PROCEDURE AddProductWithOptionalCount
    @name NVARCHAR(20),
    @manufacturer NVARCHAR(20),
    @price MONEY,
    @count INT = 1
AS
INSERT INTO Products(ProductName, Manufacturer, ProductCount, Price) 
VALUES(@name, @manufacturer, @count, @price)
DECLARE @prodName NVARCHAR(20), @company NVARCHAR(20), @price MONEY
SET @prodName = 'Redmi Note 5A'
SET @company = 'Xiaomi'
SET @price = 22000 
EXEC AddProductWithOptionalCount @prodName, @company, @price 
SELECT * FROM Products

--3
GO
CREATE PROCEDURE GetPriceStats
    @minPrice MONEY OUTPUT,
    @maxPrice MONEY OUTPUT
AS
SELECT @minPrice = MIN(Price),  @maxPrice = MAX(Price)
FROM Products
DECLARE @minPrice MONEY, @maxPrice MONEY 
EXEC GetPriceStats @minPrice OUTPUT, @maxPrice OUTPUT 
PRINT 'Минимальная цена ' + CONVERT(VARCHAR, @minPrice)
PRINT 'Максимальная цена ' + CONVERT(VARCHAR, @maxPrice)

--4
GO
 
CREATE PROCEDURE CreateProduct
    @name NVARCHAR(20),
    @manufacturer NVARCHAR(20),
    @count INT,
    @price MONEY,
    @id INT OUTPUT
AS
    INSERT INTO Products(ProductName, Manufacturer, ProductCount, Price)
    VALUES(@name, @manufacturer, @count, @price)
    SET @id = @@IDENTITY
    
 
DECLARE @id INT 
EXEC CreateProduct 'LG V30', 'LG', 3, 28000, @id OUTPUT 
PRINT @id

--5
GO
CREATE PROCEDURE GetAvgPrice AS
DECLARE @avgPrice MONEY
SELECT @avgPrice = AVG(Price)
FROM Products
RETURN @avgPrice;

DECLARE @result MONEY 
EXEC @result = GetAvgPrice
PRINT @result

stored procedure

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
namespace AutomationApp
{
    class Program
    {
        public void RunStoredProc()
        {
            SqlConnection conn = null;
            SqlDataReader rdr  = null;

            Console.WriteLine("
Top 10 Most Expensive Products:
");

            try
            {
                conn = new SqlConnection("Server=(local);DataBase=master;Integrated Security=SSPI");
                conn.Open();
                SqlCommand cmd = new SqlCommand("dbo.test", conn);
                cmd.CommandType = CommandType.StoredProcedure;
                rdr = cmd.ExecuteReader();
                /*while (rdr.Read())
                {
                    Console.WriteLine(
                        "Product: {0,-25} Price: ${1,6:####.00}",
                        rdr["TenMostExpensiveProducts"],
                        rdr["UnitPrice"]);
                }*/
            }
            finally
            {
                if (conn != null)
                {
                    conn.Close();
                }
                if (rdr != null)
                {
                    rdr.Close();
                }
            }
        }
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World");
            Program p= new Program();
            p.RunStoredProc();      
            Console.Read();
        }
    }
}

what is a stored procedure

SQL Stored Procedure