I would like to know what does a field timestamp in MSSQL do?I have read a book "ASP_NET_3_5_Social_Networking" and almost all the tabels have a columnt with type "timestamp" in their example app.What is the benefit of timestamp , and why should i use it?
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is used for update, insert and delete operations.Besides the fact
I want to know about Change Data Capture(CDC) benefits in SQl Server?Especially on Data Base Volume?
View 1 RepliesIn my application at some places we have used ObjectDataSource and at other normal method calls to retrieve data.My question is then what exactly are the benefits of using ObjectDataSource ?In the example below "CODE ONE" makes a call to the Business Layer and then Binds the results to the Grid abd "CODE TWO" is using ObjectDataSource to do the same.Then how is ObjectDataSource better?
SuitableApplicant sa = new SuitableApplicant();
IList<HD.Recruitment.SuitableApplicant> list = new List<HD.Recruitment.SuitableApplicant>();
list = HS.Recruitment.RecruitmentService.GetSuitableAppls();
GridView1.DataSource = list;
[code]....
I have a issue im trying to get though where my site while up useing a ajax timer ever 15 seconds to update there time stamp to say there still online and active. Its the best way i could think of to handle the are they online/did they just leave issue i was having. Any ways i dont know how to query the database with linq to sql so i guess i will do psudeo code like stuff and hopefully some one can offer some advice.
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I added a column of type "timestamp" to a table in SQL Server to use for concurrency control. I deleted all my tables from the Linq surface and then added them back. I see that the "Time Stamp" attribute is set to True for the timestamp column and False for all the other columns. I also see that the "Update Check" attribute is set to Never for all columns, including the timestamp column.
After watching some demo videos and reading some tutorials, I had expected to have to manually set the "Update Check" attribute values on the columns - to Never for all columns but the timestamnp column where it should be set to Always. But, before setting the "Update Check" to Always on the timestamp column, I decided to test it the way it was, and Linq seems to be doing the right thing - it seems to be using the timestamp column for concurrency control correctly even with "Update Check" set to Never on the timestamp column.
So my question is - does the fact that "Time Stamp" is set to True trump the "Update Check"? Or is there any other reason one could or should set "Update Check" to Always on a timestamp column? Is there any change in behavior?
I have a SQL table containing a timestamp column. This table is displayed in ASP using GridView control. The timestamp column is indicated in the DataKeyNames property of the GridView. I'm using TemplateFields for all columns and a ItemTemplate HiddenField control connected to the timestamp column using Eval.
<asp:TemplateField
ItemStyle-Wrap="false"
Visible="false"
HeaderText="timestamp"
SortExpression="timestamp">
<ItemTemplate>
<asp:HiddenField
ID="gv_hid_timestamp"
runat="server"
Value='<%#
Eval("timestamp") %>'
></asp:HiddenField>
</ItemTemplate>
</asp:TemplateField>
The data is displayed properly. I'm trying implement the optimistic concurrency in C# using the value of above mentioned timestamp and a stored procedure. The SQL stored procedure expects the @timestamp as varbinary(8). I'm not sure how to pass the value of gv_hid_timestamp back to the stored procedure. I'm using the following:
command.Parameters.Add("@timestamp", SqlDbType.Binary).Value = Byte.Parse(((HiddenField)gv.Rows[row].FindControl("gv_hid_timestamp")).Value);
resulting in the following error: "Input string was not in correct format." (I also tried different data types but with similar result). I want to be able to pass this parameter programmatically from C# and not have to specify it on the UpdateParameters list.
Possible Duplicate: In C#, should I use string.Empty or String.Empty or “” ? just don't understand the benefits of using String.Empty over "". Aside it being strongly typed its longer.
View 2 RepliesI think i understand the benefit of using themes but I want to be sure I understand correctly. I have previously used css to style my pages. I'm thinking about using themes in my next project. It provides a way to switch between the visual style of web controls and html elements. This could be done by allowing the user to choose a theme that is to their liking.
View 9 Repliesa) SqlCommand.ExecuteNonQuery is used for update, insert and delete operations.
Besides the fact that by using ExecuteNonQuery instead of ExecuteReader we automatically know there won't be any query results returned, are there some other benefits/reasons why ExecuteNonQuery should be used?
b) Similarly, if we want a database operation to return a single value, we should use ExecuteScalar instead of ExecuteNonquery ,where with the latter result would be returned via SqlParameter. Is there any particular reason why we should prefer ExecuteScalar over ExecuteNonQuery?
I am new to OOP. Kindly guide me why making business objects is good ? how and what benefit they bring in development. As I am new to OOP if please you decidable with example in simple way will be great help to me.
View 3 RepliesWhat is the use of timestamp? where should i use this?
View 2 Replies1. .NET best practices, 2.best frameworks, and 3. benefits of the latest version?I need urgent help to convince the customer to use .NET, but they want me to list these 3 things. Can you help me list and/or point me to good summarized articles for these?
View 3 RepliesI am looking to build a web application for users to login and do various things on my website such as depositing money, withdrawal money, creating things that require money etc. I've heard MVC3 Linq and Entity Framework is a good way to build a asp.net c# web application, but I am confused because there are so many ways to build a web application,what is the most standard way to build a website, and what are the benefits of mvc3?
View 2 Repliesexplain me or provide me with a links of good articles/tutorials on "Benefits AndLimitations of Service Oriented Architecture" ?I mean Where to Use and Where not, the SOA.
View 11 Replieswhat the equivalent datatype of sql server timestamp in VB.NET,and How to retrive the exact value of timestamp from sql server in vb.net.?
let me know that what is the advantages / benefits of using multiple web.config files in web application
View 3 RepliesI come from a PHP/Rails background where deploying a website often means FTP/Checkout of the source code in the correct directory on the web server.
However, I've been asked to develop an ASP.NET website and some people have advised me to "Publish" the site instead of copying over the source code directly. Apparently, this converts the codebehind (.cs) files into compiled DLL's etc.
My application does not contain any specific secretive business logic. It's a common shopping cart app. My question is if this is a good idea? How does not making the C# code reside on the server make the app more secure?
I have a web page that has a textbox for users to enter a datestring to check against a database. The database that I am running my query against has datetime values set at minutes since 12/31/1899 and that returns a timestamp. What I'd like to do in my code is to convert my textbox entry into minutes since 12/31/1899. Does anyone have an easy way to do that?
View 1 RepliesI have a column in my table that is named 'startDateTime' and 'endDateTime'. I need to select all the rows where current time stamp is in between the startdatetime and enddatetime. Note that the datatype is smalldatetime. How to do this?
View 1 RepliesI have created a dynamic data-driven report delivery by email in Reporting Services 2005. The report will be attached as PDF format. I can add the execution time stamp (@ExecutionTime) to the subject and comment lines. However, I cannot find a way to append the timestamp to the report name.
View 1 RepliesFor example:
Dim testdate As String = "29/10/2010"
testdate = Convert.ToDateTime(testdate.ToString)
Response.Write(testdate)
expecting "29/10/2010 00:00:00" what I get is "29/10/2010"
I have a column (data type timestamp) in SQL Server 2008.Now I want to show this timestamp value in ASP.Net C# app as string. Is there any way to do that?I tried it using regular data fetching in ASP.Net but it produced System.byte[] as output rather than actual value. In SQL Server Management Studio values are represented as 0x000000000000B3C0
View 2 RepliesI was following a MSDN walkthrough [URL] which is a very simple ASP.NET example with Visual Studio 2010:
·
I have a simple database table with a timestamp column;
·
I created a "Linq to SQL Class", and drag the table from Server Explorer onto it;
·
I dragged a LinqDataSource onto the web page and pointed it to the dbml;
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I dragged a DetailsView onto the web page using the LinqDataSource.
·
I enabled editing on the data source.
When I run, the time stamp column is also displayed on the DetailsView as something like "AAAAAAAAB9Y=". Then, when I change the "EmployeeName" and update, I got following exception: Failed to set one or more properties on type person. Cannot convert value of parameter 'tstamp' from 'System.String' to 'System.Data.Linq.Binary'. I was strictly following the MSDN walkthrough. I tried multiple times, I even installed Visual Studio 2010 SP1 Beta. But it consistently through this exception. Can someone shed some light on this? Not a encouraging start form someone thinking to learn the lastest Microsoft stuff!
I was following a MSDN walkthrough, which is a very simple ASP.NET website with Visual Studio 2010: I have a simple database table with a timestamp column;I created a "Linq to SQL Class", and drag the table from Server Explorer onto it;I dragged a LinqDataSource onto the web page and pointed it to the dbml;I dragged a DetailsView onto the web page using the LinqDataSource.I enabled editing on the data source.When I run, the time stamp column is also displayed on the DetailsView as something like "AAAAAAAAB9Y=".Then, when I change the "EmployeeName" and update, I got following exception: Failed to set one or more properties on type person. Cannot convert value of parameter 'tstamp' from 'System.String' to 'System.Data.Linq.Binary'. I was strictly following the MSDN walkthrough. Can someone shed some light on this? Not a encouraging start form someone thinking to learn the lastest Microsoft stuff!dfsaf
I'm making a simple forum using MySQL and I use a repeater to display a list of all threads in it. I have two tables for posts, one for threads and one for replies, and I want to sort the threads by either when they were posted or when the last reply was posted in it. My SQL query is really long and hard to read so here's some psuedo code similar to it (easier to understand these column names, etc):
SELECT
threads.id,
threads.title,
threads.timestamp,
users.username,
(SELECT COUNT(*) FROM replies WHERE thread_id = threads.id) AS number_of_replies,
(SELECT COUNT(*) FROM views WHERE thread_id = threads.id) AS number_of_views,
(SELECT timestamp FROM replies WHERE thread_id = threads.id ORDER BY timestamp DESC LIMIT 1) AS last_reply_timestamp
FROM threads
LEFT JOIN users
ON threads.user_id = users.id
ORDER BY ************** DESC
What I do here is I fetch the values id, title, timestamp, the author's username, the number of replies and views for a specific thread, and I also get the timestamp for the last reply to this thread.
Then, what I want to do is sort the whole list so that the threads are displayed in an order matching when either it was posted or the last reply was posted in it (you know, like a normal forum) but I'm not sure how to accomplish this.
I tried this:
ORDER BY CASE WHEN last_reply_timestamp > threads.timestamp THEN last_reply_timestamp ELSE threads.timestamp END DESC
but that, I guess, maybe only looks at the first row and determines which one should be used so the order is not correct.
I'm not sure if it's possible to create a sort of variable that holds the value for each row of the timestamp that applies, if that's possible you could sort by that. For example:
(CASE WHEN last_reply_timestamp > threads.timestamp THEN last_reply_timestamp ELSE threads.timestamp END) AS last_activity_timestamp
...
ORDER BY last_activity_timestamp DESC
So each row has a field "last_activity_timestamp" containing either timestamp, whichever is the later than the other.
Can this be done somehow? How does everyone else solve this? It's so hard to search google because I just get lots of forums but no code.