SQL Server :: Calling Methods From Data Access Layer?
Nov 15, 2010
I have created a table adapter in DAL. I have created a gridview in the page and want to fill the gridview with a table data by calling a method. My table has 11 columns but i want to display only 2 columns of the table. My getSong() method has a query as Select title, category from Muisc. But it diaplyas all columns with no data except title and category and the autoincrement primary key column with negative values. The pic is given below. How can i solve it?
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Similar Messages:
Sep 6, 2010
em all new in C# and .NET.I am following this tutorial: [URL]And i am at step 3: Adding Parameterized Methods to the Data Access Layer - i have No problems in getting out all information from my database.But when i try to get a specific item by CategoryID i get a Error.This is what i type in my Query in the table adapter:
SELECT ProductID, ProductName, SupplierID, CategoryID, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued
FROM Products
WHERE CategoryID = @CategoryID
Here is the error i get when i click finish:The wizard detected the following problems when configuring TableAdapter Query "FillByCategoryID":
Details:
Generated SELECT statement.
Error in WHERE clause near '@'.
Unable to parse query text.
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Feb 4, 2011
I am developing a web application, which has Data Access Layer and this layer has only one class, in which all methods are static methods like static Insert, static Update, static Search. It has no properties. I am using these methods in my Bussiness Logic class for my users who are visiting my website.Now my question is : 1. Is it right to use static methods in this scenario ?2. What will happen if 10 users call Insert method at the same time ?
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Aug 25, 2010
is there any impact of using static methods in Business Access layer in 3 tier applciation,
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Jun 24, 2010
I am building a web site following the tutorials on asp.net. I am using dataset as data access lay, and writing classes to access the dataset. But the example is just basic ideas, how do I retrieve individual table column value in the business layer?For example, if I have a table called Product, I only want to find out what is the product name by product id. I did this in my ProductBLL:
public ProductBLL
{
public int GetProductName(string productId)
{
ProductDataSet.ProductDataTable prodData = Adapter.GetProductById(productId);
[code]...
Is there a better way, or am I doing this correctly? Can anybody give me a reference to a more complicated business logic model?
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Jun 3, 2010
here i have in 3-tier architecture , how to pass the data between DAL and BAL. i am using grid view to edit the data,when ever i click on the edit button all the corresponding fields should come to textboxes. i tried for delete ,it works fine bt not working to EDIT.
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Jul 22, 2010
We are adding tooltips to our ASP.NET MVC product, and we are getting the text from our database (technically, from a cached copy of the data). To do so, we created an Html Helper method:
<%=Html.Tooltip(Model.GetTooltipText(Tooltips.ClientPage.StartDateId))%>
The GetTooltipText method is in our BaseViewModel, and simply uses the passed in Id to fetch the tooltip from cache. Would this be considered a bad design? What other alternatives would we have?
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Feb 3, 2010
Iam facing the problem with creating the Data Access layer using Dataset.xsd file and How to access the data from the file.
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Nov 18, 2010
Actually I have done all my Biz(business layer) and DAL CRUD Opprations using static methodes
and I just send my error messages to my log table a sample of biz layer
public static bool Delete(Guid LogGroupID)
{
using (DAL.ChroXEntities db = new ChroX.DAL.ChroXEntities())
{
var q = (from lg in db.LogGroupSet
[code]...
so what should i do to propagate an user friendly error to my users?
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Oct 27, 2010
I can not debug BLL and DAL methods VS doesn't step into those projects. Only I can debug UI project.
What's wrong with VWD express?
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Jan 24, 2016
I am calling server side methids from client side using PageMethods. Can those methods return value back to client side. If yes then how and if no then how can that be achieved? refer to my code below.
function getValuesFromPSS(s,e)
{
debugger;
[Code]....
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Nov 4, 2010
I need to make an ajax call from my javascript and access a control on my page. Using a webmethod wont work then since it's static, do I have any other options?
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Aug 25, 2010
In old style i used to return datasets to BOL (From DAL) and then to Website. but in 3.5 is there any new way to construct DAL. i heard about returning List<> is better than DataSet. I Got to build new DAL for my new project. if i should go for List <> aprroach can i use Linq to Sql technique or shall i go for execute dataset (using applicatio block libraries) and then fill data in List<> prior to return it back to BOL.
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Feb 2, 2010
I want to get the .cs class file that we use when we work with the data base. and then I can just include it in all the files.
it should contain all the information like rundbquery, runstoredproc,runstoredprocwithparams....etc.
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Nov 1, 2010
I am developing a web application in Visualt Studio 2008. I have a data access layer that is automatically generated using Visual Studio. After publising my site to IIS and tested it for several hours, two exceptions occured:
[Code]....
The connection string is stored in the data access layer in Properties.Settings and has not changed.Does anyone have a clue why these exceptions occur and how i can avoid them?
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Aug 18, 2010
I have been researching for a while and have actually created a prototype ASP.NET web service as a DAL for a few ASP.NET 2.0 web sites. Just would like to ask for some insight/advice from more experienced developers out there who had successfully rolled out DAL as a web service. What are the drawbacks/risks to deploying DAL as a web service? What is the best way to secure or authenticate consumption of this web service? WCF is out of the question, I'll be coding in VS 2005.
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Jun 14, 2010
I've VS2008 and enterprise library 4.1 installed .I want to display few records in the categories table of my NorthWind in my presentation layer through data access layer with enterprise library. I've added references of the following dlls in my data access layer project( which is of type class library)
Microsoft.Practices.EnterpriseLibrary.Common
Microsoft.Practices.EnterpriseLibrary.Data
Microsoft.Practices.ObjectBuilder2
how to access data from the database using datareader , entity beans and rendering data on to presentation layer.
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May 10, 2010
I'm now reading this article:[URL]But I don't understnad why this is better than just writing code, methods that connects to DB and get from stored procedore what I need.
Why is it better to use so much DataSets for all the tables and more.
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Sep 21, 2010
I have a potential project where I would be working on developing the "Data Access Layer" of a reporting application using ADO.Net and LINQToSQL.
I have not specifically worked on a Data Access Layer project (middle tier), so I was wondering if anyone here could provide a sample / example / resource, where I can get an idea of what the project entails.
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Feb 28, 2011
I'm trying to retrive images from SQL (2005) using ASP.NET 2008
At present I have a business object layer and a data access layer to get some data from the database. This works fine but now, i would like to also retrive an image along with the data.
part of my business object layer is shown below, how can i incorporate the image into this.
I have a DLL file which will take care of displaying the image in the web page once i have retrived it.
[Code]....
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Jul 12, 2010
I've a static page method in web form application and I want to call method on private class level variable from it as shown below. I'm using jQuery to call the page method.
private readonly ICatalogBLL _catalogBLL = new CatalogBLL();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
_catalogBLL.GetSomething();
}
}
[WebMethod]
public static UpdateSomething(int i)
{
//Want to do as below. But can't call it from a static method.
_catalogBLL.UpdateSomething();
}
UPDATE If I call it as said by John Saunders, won't it use the same instance for requests from different users as it is within a static method?
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Feb 10, 2011
I am creating my application in asp.net 3.5. I have to make my Data Access layer, in which I am doing the traditional method of fetching/updating the data. Which is SqlConnection than SQLCommand, than SQLadapter. Will there be any other way I can create my DAL layer easily.
Specification.
My website is small. Approx 7-10 pages. Database has around 80 tables.
What I know:
Linq to SQL - I don't want to use it because I am not fully aware about the LINQ statement and I need to develop the application really fast. [3 days :-( ]. Also, there are 100% chances that the table structure will be altered in future. Enterprise Library: It will take too much time for me to integrate to my application.
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Jan 27, 2010
I can use similar code below to select a row in my database when I enter a value (username) in text box and it successfully retrieves.however, I'd also like to delete row from database based on the username i enter in text box. My code runs but no row is deleted...my code is:
SQL:
private AdminTableAdapter adminGetUsers;
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Feb 1, 2011
I have written the following functions(1 & 2) in a class file(say abc.vb) to execute a sql statement in code behind.
[Code]....
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Feb 28, 2011
I am learning on how to create data access layer code for a web site. I want to ensure I am actually connecting to the datasource, so, I am wanting to use a try/catch block within my data access layer class methods. What I am not sure how to handle is a case where the connectionstate is not open. The method should ideally return a datatable. If an error is thrown would I just return an empty datatable? That is my first thought. My other thought is to return an object and pass a datatable if the connection succeeds or the exception if the connection fails.
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