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European SQL Hosting - Amsterdam :: Difference Between Stored Procedure and Function in SQL Server

clock October 28, 2013 08:44 by author Scott

Today post I will show you the difference between Stored Procedure and Function in SQL Server. Stored Procedures are pre-compile objects which are compiled for first time and its compiled format is saved which executes (compiled code) whenever it is called. But Function is compiled and executed every time when it is called.

Basic Difference

  • Function must return a value but in Stored Procedure it is optional( Procedure can return zero or n values).
  • Functions can have only input parameters for it whereas Procedures can have input/output parameters .
  • Function takes one input parameter it is mandatory but Stored Procedure may take o to n input parameters..
  • Functions can be called from Procedure whereas Procedures cannot be called from Function.

Advance Difference

  1. Procedure allows SELECT as well as DML(INSERT/UPDATE/DELETE) statement in it whereas Function allows only SELECT statement in it.
  2. Procedures can not be utilized in a SELECT statement whereas Function can be embedded in a SELECT statement.
  3. Stored Procedures cannot be used in the SQL statements anywhere in the WHERE/HAVING/SELECT section whereas Function can be.
  4. Functions that return tables can be treated as another rowset. This can be used in JOINs with other tables.
  5. Inline Function can be though of as views that take parameters and can be used in JOINs and other Rowset operations.
  6. Exception can be handled by try-catch block in a Procedure whereas try-catch block cannot be used in a Function.
  7. We can go for Transaction Management in Procedure whereas we can't go in Function.

Hope it will completely enough to explain the difference about stored procedure and Function.



European Windows 2012 Hosting - Netherlands :: How to Enable and monitor ASP.NET App Suspend on Windows Server 2012 R2

clock October 16, 2013 08:43 by author Scott

This is great feature in Windows Server 2012 and I found this interesting article from MSDN about App Suspend on Windows Server 2012. So, I decide to copy this article from msdn. Thanks to msdn.

App Suspend is a new hosting configuration in Internet Information Services (IIS) in Windows Server 2012 R2. The only requirement is that your app is running on the .NET Framework 4.5.1, which comes with Windows Server 2012 R2. No code changes are required. It’s literally as simple as the flip of a switch. Let’s take a look at that switch.

How to enable ASP.NET App Suspend

Enabling ASP.NET App suspend is pretty easy, in Internet Information Services Manager. As I wrote earlier, this setting is set on an app pool basis. Here’s what you need to do.

Open the IIS Manager

Right-click on an app pool – you’ll see the context menu

Select “Advanced Settings …”

You will see the Advanced Settings dialog. The “Idle Time-out” settings are the important ones to look at for this scenario, particularly the “Idle Time-out Action”. The default for that setting is terminate.

Change the “Idle Time-out Action” to Suspend, as you see below. Your app pool is now configured for ASP.NET App Suspend.

You will probably want to test out this feature. You could wait the entire 20 minutes, however, I suggest that you temporarily set the time-out to 1 minute, for testing purposes. Do remember to switch it back.

Monitoring site suspension

You can validate that an app was suspended in the event viewer, in the Application event log. Search for event 2310. You can see an example event, below.

Done.



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clock October 8, 2013 12:31 by author Scott

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HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. HostForLIFE.eu deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes.

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European SQL 2012 Hosting - Italy :: SQL Server 2012 Function

clock October 1, 2013 10:21 by author Scott

Here, I have provided an article showing you how to utilize the two new logical functions Choose and IIF in SQL Server. The Choose function works like an array kind of thing and the IIF function is used to check a condition. In this article we will see both functions with examples. These functions are also called new logical functions in SQL Server 2012. So let's take a look at a practical example of how to use the Choose and IIF functions in SQL Server. The example is developed in SQL Server 2012 using the SQL Server Management Studio.

These are the two logical functions:

1. IIF() Function
2. Choose() Function

IIF() Function

The IIF function is used to check a condition. Suppose X>Y. In this condition a is the first expression and b is the second expression. If the first expression evaluates to TRUE then the first value is displayed, if not the second value is displayed.

Syntax

IIF ( boolean_expression, true_value, false_value )

Example

DECLARE @X INT;
SET @X=50;
DECLARE @Y INT;
SET @Y=60;
Select iif(@X>@Y, 50, 60) As IIFResult

In this example X=50 and Y=60; in other words the condition is false.  Select iif(@X>@Y, 50, 60) As IIFResult. It returns false value that is 60.

Output

Choose() Function

This function is used to return the value out of a list based on its index number. You can think of it as an array kind of thing. The Index number here starts from 1.

Syntax

CHOOSE ( index, value1, value2.... [, valueN ] )

CHOOSE() Function excepts two parameters,

Index: Index is an integer expression that represents an index into the list of the items. The list index always starts at 1. 

Value: List of values of any data type.

Now some facts related to the Choose Function

1. Item index starts from 1

DECLARE @ShowIndex INT;
SET @ShowIndex =5;
Select Choose(@ShowIndex, 'M','N','H','P','T','L','S','H') As ChooseResult 

In the preceding example we take index=5. It will start at 1. Choose() returns T as output since T is present at @Index location 5.

Output

2.  When passed a set of types to the function it returns the data type with the highest precedence; see:

DECLARE @ShowIndex INT;
SET @ShowIndex =5;
Select Choose(@ShowIndex ,35,42,12.6,14,15,18.7)  As CooseResult

In this example we use index=5. It will start at 1. Choose() returns 15.0 as output since 15 is present at @ShowIndex location 5 because in the item list, fractional numbers have higher precedence than integers.

3. If an index value exceeds the bound of the array it returns NULL

DECLARE @ShowIndex INT;
SET @ShowIndex =9;
Select Choose(@ShowIndex , 'M','N','H','P','T','L','S','H')  As CooseResult

In this example we take index=9. It will start at 1. Choose() returns Null as output because in the item list the index value exceeds the bounds of the array; the last Index=8.

Output

4. If the index value is negative then that exceeds the bounds of the array therefore it returns NULL; see:

DECLARE @ShowIndex INT;
SET @ShowIndex =-1;
Select Choose(@ShowIndex, 'M','N','H','P','T','L','S','H')  As CooseResult

In this example we take index= -1. It will start at 1. Choose() returns Null as output because in the item list the index value exceeds the bounds of the array.

Output

5. If the provided index value has a float data type other than int, then the value is implicitly converted to an integer; see:

DECLARE @ShowIndex  INT;
SET @ShowIndex =4.5;
Select Choose(@ShowIndex ,35,42,12.6,13,15,20) As CooseResult

In this example we take index= 4.5. It will start at 1.  If the specified index value has a float data type other than int, then the value is implicitly converted to an integer. It returns the 13.0 as output since 15 is present at @ShowIndex=4.5 which means index is 4.

Output



About HostForLIFE.eu

HostForLIFE.eu is European Windows Hosting Provider which focuses on Windows Platform only. We deliver on-demand hosting solutions including Shared hosting, Reseller Hosting, Cloud Hosting, Dedicated Servers, and IT as a Service for companies of all sizes.

We have offered the latest Windows 2012 Hosting, ASP.NET 4.5 Hosting, ASP.NET MVC 5 Hosting, SQL 2014 Hosting and SQL 2014 Hosting.

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