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SQL Server 2014 Hosting - HostForLIFE.eu :: Error While Saving Table in SQL Server

clock May 31, 2016 20:46 by author Anthony

That happens because sometimes it is necessary to drop and recreate a table in order to change something. This can take a while, since all data must be copied to a temp table and then re-inserted in the new table. Since SQL Server by default doesn't trust you, you need to say "OK, I know what I'm doing, now let me do my work." This problem occurs when the Prevent saving changes that require the table re-creation option is enabled, and you make one or more of the following changes to the table:

Free ASP.NET Hosting - Europe

  • You change the Allow Nulls setting for a column.
  • You reorder columns in the table.
  • You change the column data type.
  • You add a new column.

When you change a table so that you alter the metadata structure of the table, and then you save the table, the table must be re-created based on these changes. This may result in the loss of metadata and in a direct loss of data during the re-creation of the table. If you enable the Prevent saving changes that require the table re-creation option in the Designer section of the SQL Server Management Studio (SSMS) Options window, you receive the error message that is mentioned in the “Symptoms” section.

To change the Prevent saving changes that require the table re-creation option, follow these steps:

  • Open SQL Server Management Studio (SSMS).
  • On the Tools menu, click Options.
  • In the navigation pane of the Options window, click Designers.
  • Select or clear the Prevent saving changes that require the table re-creation check box, and then click OK.

Note If you disable this option, you are not warned when you save the table that the changes that you made have changed the metadata structure of the table. In this case, data loss may occur when you save the table.

Risk of turning off the “Prevent saving changes that require table re-creation” option

Although turning off this option can help you avoid re-creating a table, it can also lead to changes being lost. For example, suppose that you enable the Change Tracking feature in SQL Server to track changes to the table. When you perform an operation that causes the table to be re-created, you receive the error message that is mentioned in the “Symptoms” section. However, if you turn off this option, the existing change tracking information is deleted when the table is re-created. Therefore, we recommend that you do not work around this problem by turning off the option.

To determine whether the Change Tracking feature is enabled for a table, follow these steps:

  • In SQL Server Management Studio, locate the table in Object Explorer.
  • Right-click the table, and then click Properties.
  • In the Table Properties dialog box, click Change Tracking.

If the value of the Change Tracking item is True, this option is enabled for the table. If the value is False, this option is disabled.

When the Change Tracking feature is enabled, use Transact-SQL statements to change the metadata structure of the table.

Steps to reproduce the problem

  • In SQL Server Management Studio, create a table that contains a primary key in the Table Designer tool.
  • Right-click the database that contains this table, and then click Properties.
  • In the Database Properties dialog box, click Change Tracking.
  • Set the value of the Change Tracking item to True, and then click OK.
  • Right-click the table, and then click Properties.
  • In the Table Properties dialog box, click Change Tracking.
  • Set the value of the Change Tracking item to True, and then click OK.
  • On the Tools menu, click Options.
  • In the Options dialog box, click Designers.
  • Click to select the Prevent saving changes that require table re-creation check box, and then click OK.
  • In the Table Designer tool, change the Allow Nulls setting on an existing column.
  • Try to save the change to the table.

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SQL Server 2014 Hosting - HostForLIFE.eu :: Avoid Multiple Database Request to Improve Performance

clock May 26, 2016 23:35 by author Peter

It is not smart to execute multiple db request for loading single page.  Review your database code to see if you have got request paths that go to the database quite once. each of these round-trips decreases the number of requests per second your application will serve. By returning multiple resultsets in a single database request, you can cut the total time spent communicating with the database.

In order to enhance performance you should execute single keep proc and bring multiple resultset in to single dB request. In this article i will explain you how to avoid multiple database request and how to bring multiple resultset into single dB request. Consider a scenario of loading a Product Page, which displays:
Product information
Product Review information.

In order to bring two information request in single dB request, your sql server keep proc ought to be declared as below.

SQL Server Stored Proc


CREATE PROCEDURE GetProductDetails
 @ProductId bigint,
AS
SET NOCOUNT ON

--Product Information
Select ProductId,
 ProductName,
 ProductImage,
 Description,
 Price
From Product
Where ProductId = @ProductId


--Product Review Information
Select  ReviewerName,
 ReviewDesc,
 ReviewDate
From ProductReview
Where ProductId = @ProductId


Asp.net, C# Code to bring multiple db request into single db request
Code Inside Data Access Class Library (DAL)
public DataSet GetProductDetails()
{
SqlCommand cmdToExecute = new SqlCommand();
cmdToExecute.CommandText = "GetProductDetails";
cmdToExecute.CommandType = CommandType.StoredProcedure;
DataSet dsResultSet = new DataSet();
SqlDataAdapter adapter = new SqlDataAdapter(cmdToExecute);

try
{
    var conString = System.Configuration.ConfigurationManager.ConnectionStrings["ConnStr"];
    string strConnString = conString.ConnectionString;
    SqlConnection conn = new SqlConnection(strConnString);

    cmdToExecute.Connection = conn;

    cmdToExecute.Parameters.Add(new SqlParameter("@ ProductId", SqlDbType.BigInt, 8, ParameterDirection.Input, false, 19, 0, "", DataRowVersion.Proposed, _productId));

    //Open Connection
    conn.Open();

    // Assign proper name to multiple table
    adapter.TableMappings.Add("Table", "ProductInfo");
    adapter.TableMappings.Add("Table1", "ProductReviewInfo");
    adapter.Fill(dsResultSet);

    return dsResultSet;             
}
catch (Exception ex)
{
    // some error occured.
    throw new Exception("DB Request error.", ex);
}
finally
{
    conn.Close();
    cmdToExecute.Dispose();
    adapter.Dispose();
}
}

Code Inside Asp.net .aspx.cs page
protected void Page_Load(object sender, EventArgs e)
{
   if (Request.QueryString[ProductId] != null)
   {
      long ProductId = Convert.ToInt64(Request.QueryString[ProductId].ToString()); 
  
      DataSet dsData = new DataSet();

      //Assuming you have Product class in DAL
      ProductInfo objProduct = new ProductInfo();
      objProduct.ProductId = ProductId;
      dsData = objProduct.GetProductDetails();

      DataTable dtProductInfo = dsData.Tables["ProductInfo"];
      DataTable dtProductReviews = dsData.Tables["ProductReviewInfo"];

      //Now you have data table containing information
      //Make necessary assignment to controls
      .....
      .....
      .....
      .....
      ..... 

    }
}

 

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SQL Server Hosting - HostForLIFE.eu :: SQL Server Event Alerts

clock May 24, 2016 18:34 by author Anthony

In this article, we will discuss about SQL Server Alert and conditional responses. SQL Server event alerts that respond by notifying operators can lead to too much noise in your email inbox. There is a built-in option to specify a number of minutes to delay between responses. For many, that setting alone is sufficient to keep the spam down to a minimum. But events may still occur during that "delay between responses" window. And SQL Server will fire alerts for them. You may not always want the response suppressed.

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SQL Server provides another way to more selectively respond to alerts: by executing a SQL Agent job, and using tokens within the job steps. To use tokens, you'll need to enable their use. Open SQL Server Agent Properties, select the Alert System page, and check the "Replace tokens for all job responses to alerts" checkbox as seen here:

Now let's look at a typical alert. The one pictured below raises alerts for errors with a severity level of 20. On the Response page, we see the alert is configured to respond by executing a job. (From this dialog you can choose an existing job, or click to create a new one.) The Notify Operators option is left unchecked.

Within the "DBA-Catch Severity 20 Alert" SQL Agent job, T-SQL job steps that use tokens can be created. Here is an example:

DECLARE @Descr VARCHAR(MAX) = '$(ESCAPE_SQUOTE(A-MSG))';

 

IF @Descr LIKE '%CLIENT: 127.0.0.1%'

BEGIN

    --Do nothing.

    PRINT 'Alert originating from pen test server.'

END

ELSE

BEGIN

    DECLARE @To NVARCHAR(MAX) = '[email protected]';

    DECLARE @Subj NVARCHAR(255);

    DECLARE @EmailBody NVARCHAR(MAX);

    DECLARE @Date VARCHAR(MAX) = '$(ESCAPE_SQUOTE(DATE))';

    DECLARE @Time VARCHAR(MAX) = '$(ESCAPE_SQUOTE(TIME))';

 

    SET @Subj = 'SQL Server Alert System: ''20-Fatal Error in Current Process''' +

        'occurred on ' + @@SERVERNAME

    SET @Date = SUBSTRING(@Date, 5, 2) + '/' + RIGHT(@Date, 2) + '/' + LEFT(@Date, 4);

    SET @Time = LEFT(@Time, 2) + ':' + SUBSTRING(@Time, 3, 2) + ':' + RIGHT(@Time, 2);

    SET @EmailBody = 'DATE/TIME: ' + @Date + ' ' + @Time + '

 

DESCRIPTION: ' + @Descr + '

COMMENT: (None)

JOB RUN: (None)'

    EXEC msdb..sp_send_dbmail

        @recipients = @To,

        @subject = @Subj,

        @body = @EmailBody

END


There are three tokens within the T-SQL (highlighted in yellow above): A-MSG, DATE, and TIME. SQL server replaces these three tokens as follows:

 

  • A-MSG: Message text. If the job is run by an alert, the message text value automatically replaces this token in the job step.

 

  • DATE: Current date (in YYYYMMDD format).

 

  • TIME: Current time (in HHMMSS format).

 

Note the conditional logic, checking the error message. If it originates from a server with a particular IP address, no action is taken. Otherwise, an email is sent with the relevant error information. (This is a real-world example involving recurring penetration tests. The pen test server conducted port scans on the SQL host and attempted numerous connections as [sa]. I got an onslaught of unwanted email.)

Tokens are a powerful tool that give you a lot of flexibility. This very simple example just scratches the surface of what is possible. Use your imagination. Get creative. Happy alerting!

 

 



AngularJS Hosting - HostForLIFE.eu :: How to Create Cascading Dropdown in AngularJS?

clock May 17, 2016 20:38 by author Peter

In this post, I will make a Cascading Dropdown in AngularJS. Add 2 Class 1 for Countries and other for state. Write the following code:
public class Country 

    public int CountryId { get; set; } 
    public string CountryName { get; set; } 

public class State 

    public int StateId { get; set; } 
    public string StateName { get; set; } 
    public int CountryId { get; set; } 

Create a ActionResult Name it as Index [Add a View].

Add the script

<script src="~/Scripts/angular.min.js"></script> 

Create a js Name it in my case its CascadingDropdown.

var app = angular.module('myApp', []); 
app.controller('myController', function ($scope, $http) { 
    getcountries(); 
    function getcountries() { 
     
        $http({ 
            method: 'Get', 
            url: '/Home/Countries' 
 
        }).success(function (data, status, header, config) { 
 
            $scope.countries = data; 
        }).error(function (data, status, header, config) { 
            $scope.message = "Error"; 
        }); 
    } 
 
    $scope.GetStates = function ()  
    { 
        var countryIdselected = $scope.countrymodel; 
        if (countryIdselected) { 
            $http({ 
                method: 'Post', 
                url: '/Home/States', 
                data: JSON.stringify({ countryId: countryIdselected }) 
            }).success(function (data, status, header, config) { 
                $scope.states = data; 
            }).error(function (data, status, header, config) { 
                $scope.message = "Error"; 
            }) 
        } 
        else { 
            $scope.states = null; 
        } 
    } 
}); 
 
 
//Calls for Country DropDown 
 public ActionResult Countries() 
        { 
            List<Country> cobj = new List<Country>(); 
            cobj.Add(new Country { CountryId = 1, CountryName = "India" }); 
            cobj.Add(new Country { CountryId = 2, CountryName = "Srilanka" }); 
            cobj.Add(new Country { CountryId = 3, CountryName = "USA" }); 
 
            return Json(cobj, JsonRequestBehavior.AllowGet); 
        } 
 
//Calls for State DropDown with CountryID as Parameter 
 
        public ActionResult States(int countryId) 
        { 
   List<State> sobj = new List<State>(); 
   sobj.Add(new State { StateId = 1, StateName = "Karnataka", CountryId = 1 }); 
   sobj.Add(new State { StateId = 2, StateName = "Kerala", CountryId = 1 }); 
   sobj.Add(new State { StateId = 3, StateName = "TamilNadu", CountryId = 1 }); 
   sobj.Add(new State { StateId = 1, StateName = "Newyork", CountryId = 3 }); 
   sobj.Add(new State { StateId = 1, StateName = "Colombo", CountryId = 2 }); 
 
//Filter based on CountryID 
            var result = sobj.Where(x => x.CountryId == countryId).Select(x => new { x.StateId, x.StateName }); 
 
            return Json(result); 
        } 
 
//IndexView 
//  Add the script file <script src="~/Scripts/CascadingDropdown.js"></script> 
<div ng-app="myApp"> 
       
            <form name="mainForm"  ng-controller="myController"> 
 
                <select ng-model="countrymodel" ng-options=" c.CountryId as c.CountryName for c in countries" ng-change="GetStates()"> 
                    <option value="">-- Select Country --</option> 
                </select> 
                <select ng-model="statemodel" ng-options="s.StateId as s.StateName for s in states "> 
                    <option value="">-- Select State --</option> 
                </select> 
            </form> 
</div>  


I hope it works for you!

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SQL Server 2014 Hosting - HostForLIFE.eu :: How to Save Youtube video into database and display using Linq?

clock May 12, 2016 00:08 by author Peter

In this article I am going to explain how to save the youtube into database and display it in Gridview using Linq. I have got a requirement to save the youtube video URL into database and display them where user can play the videos. I have created a table Tb_videos which store the information video tile, description and URL as you can see on the following :

HTML Markup:
<table>  
<tr>
<td>Title :</td>
 <td>
     <asp:TextBox ID="txttitle" runat="server" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td>Description :</td>
 <td><asp:TextBox ID="txtdescription" runat="server" TextMode="MultiLine" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td>Video URL :</td>
 <td><asp:TextBox ID="txturl" runat="server" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td></td>
 <td>
     <asp:Button ID="btnsubmit" runat="server" Text="Submit" /></td>
 </tr>
</table>
<br />
    <asp:GridView ID="grdvideo" runat="server" AutoGenerateColumns="False"
        BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px"
        CellPadding="4" ForeColor="Black" GridLines="Vertical">
        <AlternatingRowStyle BackColor="White" />
    <Columns>
    <asp:BoundField DataField="Title" HeaderText="Title" />
    <asp:BoundField DataField="Description" HeaderText="Description"/>
   <asp:TemplateField HeaderText="Videos">
   <ItemTemplate>
   <object  width="480" height="385">
<embed src='<%#Eval("url") %>' type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385">
</embed>
</object> 
   </ItemTemplate>
   </asp:TemplateField>
    </Columns>
        <FooterStyle BackColor="#CCCC99" />
        <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
        <RowStyle BackColor="#F7F7DE" />
        <SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#FBFBF2" />
        <SortedAscendingHeaderStyle BackColor="#848384" />
        <SortedDescendingCellStyle BackColor="#EAEAD3" />
        <SortedDescendingHeaderStyle BackColor="#575357" />
    </asp:GridView>


Import the namespace
C#:
using System.Text.RegularExpressions;

VB:
Imports System.Text.RegularExpressions

Create the object of DBML:
C#:
BlogDataContext db = new BlogDataContext();

VB:
Private db As New BlogDataContext()

Get the Youtube video id
Write a function to get the youtube video id from youtube video URL .

C# Code:
private string GetYouTubeVideoID(string youTubeVideoUrl)
{
    var regexMatch = Regex.Match(youTubeVideoUrl, "^[^v]+v=(.{11}).*",
                       RegexOptions.IgnoreCase);
    if (regexMatch.Success)
    {
        return "http://www.youtube.com/v/" + regexMatch.Groups[1].Value +"&hl=en&fs=1";
    }
    return youTubeVideoUrl;
}


VB Code:
Private Function GetYouTubeVideoID(ByVal youTubeVideoUrl As String) As String
    Dim regexMatch = Regex.Match(youTubeVideoUrl, "^[^v]+v=(.{11}).*", RegexOptions.IgnoreCase)
    If regexMatch.Success Then
        Return "http://www.youtube.com/v/" + regexMatch.Groups(1).Value + "&hl=en&fs=1"
    End If
    Return youTubeVideoUrl
End Function


Save the record to database
On button click write the below given code to insert the record into database table.

C# Code:
protected void btnsubmit_Click(object sender, EventArgs e)
{
    try
    {
        string ytFormattedVideoUrl = GetYouTubeVideoID(txturl.Text);
        Tb_Video tb = new Tb_Video();
        tb.Title = txttitle.Text;
        tb.Description = txtdescription.Text;
        tb.URL = ytFormattedVideoUrl;
        db.Tb_Videos.InsertOnSubmit(tb);
        db.SubmitChanges();
        Response.Write("<script>alert('Record Inserted Successfully');</script>");
        BindGrid();
        Clear();
    }
    catch (Exception ex)
    { }
}
public void Clear()
{
    txturl.Text = string.Empty;
    txtdescription.Text = string.Empty;
    txttitle.Text = string.Empty;
}


VB Code:
Protected Sub btnsubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnsubmit.Click
    Try
        Dim ytFormattedVideoUrl As String = GetYouTubeVideoID(txturl.Text)
        Dim tb As New Tb_Video()
        tb.Title = txttitle.Text
        tb.Description = txtdescription.Text
        tb.URL = ytFormattedVideoUrl
        db.Tb_Videos.InsertOnSubmit(tb)
        db.SubmitChanges()
        Response.Write("<script>alert('Record Inserted Successfully');</script>")
        BindGrid()
        Clear()
    Catch ex As Exception
    End Try
End Sub
Public Sub Clear()
    txturl.Text = String.Empty
    txtdescription.Text = String.Empty
    txttitle.Text = String.Empty
End Sub


Fetch the record from database and display
Create a method to get the record from database table and display in Gridview data control.

C# Code:
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGrid();
    }
}

public void BindGrid()
{
    try
    {
        var bind = from v in db.Tb_Videos
                   select v;
        grdvideo.DataSource = bind;
        grdvideo.DataBind();
    }
    catch (Exception ex)
    {
    }
}


VB Code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        BindGrid()
    End If
End Sub

Public Sub BindGrid()
    Try
        Dim bind = From v In db.Tb_Videos
        grdvideo.DataSource = bind
        grdvideo.DataBind()
    Catch ex As Exception
    End Try
End Sub


Build the project and run. To test the application inserts a record into database.

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SQL Server 2014 Hosting - HostForLIFE.eu :: How to Save Youtube video into database and display using Linq?

clock May 12, 2016 00:08 by author Peter

In this article I am going to explain how to save the youtube into database and display it in Gridview using Linq. I have got a requirement to save the youtube video URL into database and display them where user can play the videos. I have created a table Tb_videos which store the information video tile, description and URL as you can see on the following :

HTML Markup:
<table>  
<tr>
<td>Title :</td>
 <td>
     <asp:TextBox ID="txttitle" runat="server" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td>Description :</td>
 <td><asp:TextBox ID="txtdescription" runat="server" TextMode="MultiLine" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td>Video URL :</td>
 <td><asp:TextBox ID="txturl" runat="server" Width="450px"></asp:TextBox></td>
</tr>
<tr>
<td></td>
 <td></td>
</tr>
   <tr>
<td></td>
 <td>
     <asp:Button ID="btnsubmit" runat="server" Text="Submit" /></td>
 </tr>
</table>
<br />
    <asp:GridView ID="grdvideo" runat="server" AutoGenerateColumns="False"
        BackColor="White" BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px"
        CellPadding="4" ForeColor="Black" GridLines="Vertical">
        <AlternatingRowStyle BackColor="White" />
    <Columns>
    <asp:BoundField DataField="Title" HeaderText="Title" />
    <asp:BoundField DataField="Description" HeaderText="Description"/>
   <asp:TemplateField HeaderText="Videos">
   <ItemTemplate>
   <object  width="480" height="385">
<embed src='<%#Eval("url") %>' type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="480" height="385">
</embed>
</object> 
   </ItemTemplate>
   </asp:TemplateField>
    </Columns>
        <FooterStyle BackColor="#CCCC99" />
        <HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
        <RowStyle BackColor="#F7F7DE" />
        <SelectedRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
        <SortedAscendingCellStyle BackColor="#FBFBF2" />
        <SortedAscendingHeaderStyle BackColor="#848384" />
        <SortedDescendingCellStyle BackColor="#EAEAD3" />
        <SortedDescendingHeaderStyle BackColor="#575357" />
    </asp:GridView>


Import the namespace
C#:
using System.Text.RegularExpressions;

VB:
Imports System.Text.RegularExpressions

Create the object of DBML:
C#:
BlogDataContext db = new BlogDataContext();

VB:
Private db As New BlogDataContext()

Get the Youtube video id
Write a function to get the youtube video id from youtube video URL .

C# Code:
private string GetYouTubeVideoID(string youTubeVideoUrl)
{
    var regexMatch = Regex.Match(youTubeVideoUrl, "^[^v]+v=(.{11}).*",
                       RegexOptions.IgnoreCase);
    if (regexMatch.Success)
    {
        return "http://www.youtube.com/v/" + regexMatch.Groups[1].Value +"&hl=en&fs=1";
    }
    return youTubeVideoUrl;
}


VB Code:
Private Function GetYouTubeVideoID(ByVal youTubeVideoUrl As String) As String
    Dim regexMatch = Regex.Match(youTubeVideoUrl, "^[^v]+v=(.{11}).*", RegexOptions.IgnoreCase)
    If regexMatch.Success Then
        Return "http://www.youtube.com/v/" + regexMatch.Groups(1).Value + "&hl=en&fs=1"
    End If
    Return youTubeVideoUrl
End Function


Save the record to database
On button click write the below given code to insert the record into database table.

C# Code:
protected void btnsubmit_Click(object sender, EventArgs e)
{
    try
    {
        string ytFormattedVideoUrl = GetYouTubeVideoID(txturl.Text);
        Tb_Video tb = new Tb_Video();
        tb.Title = txttitle.Text;
        tb.Description = txtdescription.Text;
        tb.URL = ytFormattedVideoUrl;
        db.Tb_Videos.InsertOnSubmit(tb);
        db.SubmitChanges();
        Response.Write("<script>alert('Record Inserted Successfully');</script>");
        BindGrid();
        Clear();
    }
    catch (Exception ex)
    { }
}
public void Clear()
{
    txturl.Text = string.Empty;
    txtdescription.Text = string.Empty;
    txttitle.Text = string.Empty;
}


VB Code:
Protected Sub btnsubmit_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnsubmit.Click
    Try
        Dim ytFormattedVideoUrl As String = GetYouTubeVideoID(txturl.Text)
        Dim tb As New Tb_Video()
        tb.Title = txttitle.Text
        tb.Description = txtdescription.Text
        tb.URL = ytFormattedVideoUrl
        db.Tb_Videos.InsertOnSubmit(tb)
        db.SubmitChanges()
        Response.Write("<script>alert('Record Inserted Successfully');</script>")
        BindGrid()
        Clear()
    Catch ex As Exception
    End Try
End Sub
Public Sub Clear()
    txturl.Text = String.Empty
    txtdescription.Text = String.Empty
    txttitle.Text = String.Empty
End Sub


Fetch the record from database and display
Create a method to get the record from database table and display in Gridview data control.

C# Code:
protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGrid();
    }
}

public void BindGrid()
{
    try
    {
        var bind = from v in db.Tb_Videos
                   select v;
        grdvideo.DataSource = bind;
        grdvideo.DataBind();
    }
    catch (Exception ex)
    {
    }
}


VB Code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not IsPostBack Then
        BindGrid()
    End If
End Sub

Public Sub BindGrid()
    Try
        Dim bind = From v In db.Tb_Videos
        grdvideo.DataSource = bind
        grdvideo.DataBind()
    Catch ex As Exception
    End Try
End Sub


Build the project and run. To test the application inserts a record into database.

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SQL 2016 Hosting - HostForLIFE.eu :: How to Use Concat Function in SQL 2016?

clock May 3, 2016 00:52 by author Anthony

In this tutorial, I will explain how to use concat function in SQL 2016. CONCAT function is also known as T-SQL Function which was introduced in SQL Server 2012. This function allows us to concatenate two or more parameters values together and these parameters values should be separated by comma. Before release of Concat function, we used to use the “+” operator to combine or concatenate two or more string values. The most important feature of Concat function is that it also takes care of data type conversion and beautifully handles NULL on its own. In case of Concat function, we don't need to care about the null values in the parameters which are going to be used.

Syntax

CONCAT ( string_value1, string_value2 [, string_valueN ] )

Arguments

string_value: A string value to concatenate to the other values.

Return Types: String, the length and type of which depend on the input.

 

Interesting features

1. CONCAT takes a variable number of string arguments and concatenates them into a single string.

2. It requires at least two input values; otherwise, an error is raised.

3. All arguments are implicitly converted to string types and then concatenated.

4. Best part of this; Null values are implicitly converted to an empty string. If all the arguments are null, an empty string of type varchar(1) is returned.

5. The implicit conversion to strings follows the existing rules for data type conversions. 

6. If none of the input arguments is of a supported large object (LOB) type, then the return type is truncated to 8000 in length, regardless of the return type. This truncation preserves space and supports efficiency in plan generation.

Examples:

Concatenate Space Characters with input variables

 

To understand the features of Concat function, we are showing the examples with Concat function and without the concat functions as given below:

---- Declare local variables

Declare @inpFirstName Varchar(20) ='John'

Declare @inpLastName Varchar(20) ='Carter'

 

---- Concatenating variables without Concat Function

Select @inpFirstName+' '[email protected] as FullName

FullName

John Carter

---- Concatenating variables with Concat Function

Select CONCAT(@inpFirstName,' ',@inpLastName) as FullName

FullName

John Carter

 

In the above example, we are using the two variables to concatenating together. You can see that, we are getting the same outputs. 

 

Concatenate Space Characters with with NULL values

Now, we are going to make some interesting changes in the above example by setting the null value in the second variable as given below:

---- Declare local variables

Declare @inpFirstName Varchar(20) ='John'

---- Set Null Value here

Declare @inpLastName Varchar(20) =NULL

 

---- Concatenating variables without Concat Function

Select @inpFirstName+' '[email protected] as FullName

FullName

NULL

---- Concatenating variables with Concat Function

Select CONCAT(@inpFirstName,' ',@inpLastName) as FullName

FullName

John

You can easily see that full name is showing NULL values in case of without Concat function but by using Concat function, full name is showing because of Null values are implicitly converted to an empty string.

Concatenate number and string together

If you want to concatenate string with numeric value then you should need to convert the numeric value into the string as given below:

---- Declare local variables

Declare @inpFirstName Varchar(20) ='John'

Declare @inpContactNumber BIGINT =1234567890

 

---- Concating variables without Concat Function

Select @inpFirstName+':'+CAST(@inpContactNumber as VarcharasNameWithContact

 

NameWithContact

John :1234567890

---- Concatenating variables with Concat Function

Select CONCAT(@inpFirstName,':',CAST(@inpContactNumber as Varchar))as NameWithContact

 

NameWithContact

John:1234567890

If you want to concatenate two numeric values then there is no need to change their data types because of implicit conversion to strings follows the existing rules for data type conversions.

Conclusion

The CONCAT function appends one string to the end of another string and does not require ISNULL for converting NULL into an empty string. All arguments are implicitly converted to string types and then concatenated.

 

 

 

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About HostForLIFE.eu

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We have offered the latest Windows 2016 Hosting, ASP.NET Core 2.2.1 Hosting, ASP.NET MVC 6 Hosting and SQL 2017 Hosting.


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