Having Trouble Following Tutorial - Working With Data In ASP.NET 2.0 :: Creating A Data Access Layer
Nov 1, 2006
Hi
I'm having problems following the tutorial on creating a data access layer - http://www.asp.net/learn/dataaccess/tutorial01cs.aspx?tabid=63 - when I try to compile in Visual Studio 2005 I get namespace could not be found.
I followed exactly the tutorial - I created a dataset and added this code in my aspx page.
<asp:GridView ID="GridView1" runat="server"
CssClass="DataWebControlStyle">
<HeaderStyle CssClass="HeaderStyle" />
<AlternatingRowStyle CssClass="AlternatingRowStyle" />
In my C# file I added these lines...
using NorthwindTableAdapters; <<<<<this is the problem - where does this come from?
In my web application, i'm using 2 tabels; Users(Username(PK), Pwd, Name, Deptid(FK)) n Dept(Deptid(PK), Deptname)). For creating a Data Access Layer 4 my project, I added dataset as new item n followed the wizard 2 create the required functions. I have a function GetUser(@uname, @pwd), which takes username n password as input. M using this for authentication purpose. While executing it poping an ConstrainException. Plz help me out.
I've tried 2 as clear as possible here. OR u may ask me any other questions for clear picture of the scenario. Thanks and Regards, Sankar.
I request you plz tell how to create Data Access Layer. I mean DataAccess.dll. So that I can call stored procedure from dataaccess.dll as below. DataAccess.SqlHelper.ExecuteDataset(DataAccess.DSN.Connection("DBConnectionString"), CommandType.StoredProcedure, "SP_GetEmpIds"); I request you how can I add this stored procedures to DataAccess.dll and function. I am not having any idea in this area. I request you plz give me some suggestions to work with task.
I've been developing desktop client-server and web apps and have used Access and SQL Server Standard most of the time. I'm looking into using SQL CE, and had a few questions that I can't seem to get a clear picture on:
- The documentation for CE says that it supports 256 simultaneous connections and offers the Isolation levels, Transactions, Locking, etc with a 4GB DB. But most people say that CE is strictly a single-user DB and should not be used as a DB Server. Could CE be extended for use as a multi-user DB Server by creating a custom server such as a .NET Remoting Server hosted through a Windows Service (or any other custom host) on a machine whereby the CE DB would run in-process with this server on the machine which would then be accessed by multiple users from multiple machines?? Clients PCs -> Server PC hosting Remoting Service -> ADO.NET -> SQL CE
- and further more can we use Enterprise Services (Serviced Components) to connect to SQL CE and further extend this model to offer a pure high-quality DB Server? Clients PCs -> Server PC hosting Remoting Service -> Enterprise Services -> ADO.NET -> SQL CE
Seems quite doable to me, but I may be wrong..please let me know either ways
I've been following Soctt Mitchell's tutorials on Data Access and in Tutorial 1 (Step 5) he suggests using SQL Subqueries in TableAdapters in order to pick up extra information for display using a datasource. I have two tables for a gallery system I'm building. One called Photographs and one called MS_Photographs which has extra information about certain images. When reading the MS_Photograph data I also want to include a couple of fields from the related Photographs table. Rather than creating a table adapter just to pull this data I wanted to use the existing MS_Photographs adapter with a query such as...1 SELECT CAR_MAKE, CAR_MODEL, 2 (SELECT DATE_TAKEN 3 FROM PHOTOGRAPHS 4 WHERE (PHOTOGRAPH_ID = MS_PHOTOGRAPHS.PHOTOGRAPH_ID)) AS DATE_TAKEN, 5 (SELECT FORMAT 6 FROM PHOTOGRAPHS 7 WHERE (PHOTOGRAPH_ID = MS_PHOTOGRAPHS.PHOTOGRAPH_ID)) AS FORMAT, 8 (SELECT REFERENCE 9 FROM PHOTOGRAPHS 10 WHERE (PHOTOGRAPH_ID = MS_PHOTOGRAPHS.PHOTOGRAPH_ID)) AS REFERENCE, 11 DRIVER1, TEAM, GALLERY_ID, PHOTOGRAPH_ID 12 FROM MS_PHOTOGRAPHS 13 WHERE (GALLERY_ID = @GalleryID) This works but I wanted to know if there's a way to get all of the fields using one subquery instead of three? I did try it but it gave me errors for everything I could think of.Is using a subquery like above the best way when you want this many fields from a secondary table or should I be using another approach. I'm using classes for the BLL as well and wondered if there's a way to do it at this stage instead?
How do I get a System Table like 'Sysobjects' into the Data Access Layer? My app generates tables on the fly, and has to check in the sysobjects table which tables are present.
Hi Experts ! I want to use maximum feature of SQL Server 2005 and ASP.Net 2.0 in making Data Access LayerSuggestions will be welcomed .Thank you RegardsKAMRAN
I've a management module (managing Products) currently being displayed on the aspx page using ObjectDataSource and GridView control.The datasource is taken from a class residing in my Data Access layer with custom methods such as getProducts() and deleteProduct(int productID)I'm currently using SqlDataAdapter as well as Datasets to manipulate the data and have no big problems so far.However, my issue is this, each time i delete a product using the deleteProduct method, I would need to refill the dataset to fill the dataset before i can proceed to delete the product. But since I already filled the dataset using the getProducts() method, is it possible to just use that dataset again so that I dont have to make it refill again? I need to know this cos my data might be alot in the future and refilling the dataset might slow down the performance. 1 public int deleteCompany(Object companyId) 2 { 3 SqlCommand deleteCommand = new SqlCommand("DELETE FROM pg_Company WHERE CompanyId = @companyId", getSqlConnection()); 4 5 SqlParameter p1 = new SqlParameter("@companyId", SqlDbType.UniqueIdentifier); 6 p1.Value = (Guid)companyId; 7 p1.Direction = ParameterDirection.Input; 8 9 deleteCommand.Parameters.Add(p1); 10 dataAdapter.DeleteCommand = deleteCommand; 11 12 companyDS = getCompanies(); // <--- I need to refill this before I can delete, I would be iterating an empty ds. 13 14 try 15 { 16 foreach (DataRow row in companyDS.Tables["pg_Company"].Select(@"companyId = '" + companyId + "'")) 17 { 18 row.Delete(); 19 } 20 return dataAdapter.Update(companyDS.Tables["pg_Company"]); 21 } 22 catch 23 { 24 return 0; 25 } 26 finally { } 27 } I thank you in advance for any help here.
I am having a application in which from the front end i am saving details of three different things
i.Enquiry Details
ii.Parts Details
iii.Machine details
i am saving the Enquiry detail in a data table,Parts Details in a data table and machine detail in a data table and finally i am adding the three data tables into a single data set and passing the data set to data access layer there i have three insert command one for each data table in my case the enquiry data table will be saved first and then the next two details will be saved and i am saving the details in three different tables in the database, my problem is some times the enquiry details will save to the database and while saving the Parts details there may be some exception and i will throw an exception in that case the enquiry details will be saved and the remaining two details are not saved(Which are also part of the same Transaction).I wanted to know about how to call the transaction function in case of Data Access Layer.
objEntites.inTest = obj.inTest;-----------------------------------------------ERROR LINE
// objEntites.Add(obj);
}
return objEntites;
}
}
}
Error 2 foreach statement cannot operate on variables of type 'System.Data.IDataReader' because 'System.Data.IDataReader' does not contain a public definition for 'GetEnumerator' D:KOTI_PRJSEnterpriseCustomerClass1.cs 34 13 Customer
I am taking my first stab at a 3 tier architecture within ASP.Net. I have been adding datasets and creating a new Insert to add certain parts to a table. I am trying to add a date field called 'DateAdded' and is setup in SQL as a DateTime. When Visual Studio auto created the dataset, the Insert function is not "DateAdded as Datetime" as I would have expected, but it is "DateAdded as System.Nullable(Of Date)". There is a space in between 'Of' and 'Date'. If I keep the space in there the insert function shows an error that says "Arguement not specified for parameter DateAdded of funtion( etc. etc.). If I take the space out, the error on the insert function goes away but there is an error within the "OfDate" that says "Array bound cannot appear in type specifiers". I am confused on why the date format changed and how I can get a date to go into the database using the autogenerated datasets from Visual Studio. Any help would be appreciated. Thanks, Mike
The query fails to execute and returns an error: String[1]: the Size property has an invalid size of 0. If I change the SqlDbType.Text parameter type to SqlDBType.Varchar, 100 (or any other fixed varchar length), it works but limits the length my unlimited field text. Any suggestions on how I can use db type text or varchar(max)? The field I need to retrieve is string characters of unlimited length and hence the datatype varchar(max).
We have purchased an ERP system from a vendor which uses system DSN for all the reports. The system automatically creates DSN with Sa with SQL Server. The problem is the DSN is not working with AD users.
Active Directory server: Windows Server 2008 32 Bit.
SQL Server: Windows Server 2012 64 Bit. This server is already member of my Domain. e.g. CompDomain.com
What should I need to do in client PCs or Server to avail ODBC to AD users.
I am trying to go thru the deployment tutorial, but I'm running into some trouble. The two sample packages I need to work with are called DataTransfer.dtsx and LoadXMLData.dtsx found in the samples.
When I examine these packages, they are writing to tables called dbo.HighIncomeCustomers and dbo.OrderDatesByCountryRegion. These tables don't exist in my copy of AdventureWorks database.
Also, when I try to open the Connection Manager for the target tables, I get a message that says, "The specified provider is not suported. Please choose different provider in connection manager."
Is it possible I'm having these issues because I'm working with a different version of the sample packages?
Does anyone know any good MS SQL or TSQL tutorials? I know the basics of SQL, such as joins, functions such as COUNT, SUM etc so I do not need one of them. Problem is I am using MS SQL at a new role in work and finding it difficult. I write the statements how I would in oracle of mysql but find that they refuse to work, and I can not find/use the MS SQL Help to find what I want.
I have been trying to set up roles and security for my database using SQL Web Data Administrator(from Microsoft). Unfortunately, i am facing some difficulties to do it. Is there any link that explain how to manage these roles and security issues in the program.
create table #datatable (id int, name varchar(100), email varchar(10), phone varchar(10), cellphone varchar(10), none varchar(10) ); insert into #datatable exec ('select * from datatable where id = 1') select * from #datatable
I still want to retrieve the data and present it in the software's presentation layer but I still want to remove the temp table in order to reduce performance issue etc.
If I paste the code DROP
TABLE #datatable after insert into #datatable exec ('select * from datatable where id = 1')
Does it gonna work to present the data in the presentation layer after removing the temp table?
The goal is to retrieve the data from a stored procedure and present it in the software's presentation layer and I still need to remove the temptable after using it because I will use the SP many time in production phase.
Microsoft released an introductory tutorial for data mining in September 2007, and I was attempting to match the results on: http://msdn2.microsoft.com/en-us/library/ms169911.aspx
I was not able to match the results, so then I went "under the hood" for the tables, and discovered that my copy of AdventureWorksDW has truncated values in the Education field of the ProspectiveBuyer table. I had wanted to connect "EnglishEducation" from the Mining Model to "Education" in the "Input Table" to see if the additional linkage would affect the prediction results (the wizard does not automatically link these fields because they technically do not have the same name).
1) Is everybody's "Education" field in the "Prospective Buyers" table populated with truncated values? (which may be intentional since it is a sample dataset) -- compare to "EnglishEducation" field in the vTargetMail table
2) Am I the only one getting 0.50580 for all rows when I use "Decision Tree" (per the tutorial instructions)? By contrast, I was able to see a variance in expression values for clustering and naive Bayes.
My guess: everybody has a truncated "Education" field, and there is something different in how the data mining model was run under the Decision Tree option to yield the tutorial's numerical results for "expression".
Hi everyone, I'm trying to get the data mining tutorial building but I'm getting tons of ATL errors. When using the wizard to add "Simple ATL Objects" I get messages telling me that the IDMAlgorithm object already exists. It's really driving me insane, because it's stopping me from moving on completely. I've tried deleting the project and recreating it several times with no avail. Hopefully someone will know what's causing the troubles. Thanks in advance,
I'm trying to re-write my database to de-couple the interface (MS Access) from the SQL Backend. As a result, I'm going to write a number of Stored Procedures to replace the MS Access code. My first attempt worked on a small sample, however, trying to move this on to a real table hasn't worked (I've amended the SP and code to try and get it to work on 2 fields, rather than the full 20 plus).It works in SQL Management console (supply a Client ID, it returns all the client details), but does not return anything (recordset closed) when trying to access via VBA code.The Stored procedure is:-
USE [VMSProd] GO /****** Object: StoredProcedure [Clients].[vms_Get_Specified_Client] Script Date: 22/09/2015 16:29:59 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON
Could please any of you give me some advices for if there are tutorials and demos avaiable which cover all the SQL Server 2005 data mining built-in algorithms?
That will be great to hear from any of you shortly. Thanks a lot in advance.
I have a client who has SSMS installed on her laptop. She is able to connect to the SQL server via SSMS in the office and query data on the server.
She needs to be out of site often and doesn't have internet access. She asks if the data tables can be "backed up" or saved on her laptop, so she can look at them without worrying connecting to the server. I am not sure if this can be achieved, as SSMS is built for accessing a server, not a desktop. Myself never have this need. If I really need it, I would go to Microsoft Access and create an ODBC connection to the datatables. But this client thinks that Microsoft Access is beneath her.
I couldn't think how to title this post so I apolgise for the poor title, maybe it's because it's getting late in the day and is too warm, maybe thats also why I can't think of the answer myself right now .
Anyway say I'm doing something where part of the data is a date (e.g. a counter) and then I want to get all the data from there between a set of two dates.
Now I can do that all fine, however what I want is 0's to be returned for dates where there is no data stored.
E.g.
At the moment I would get (for dates between 1st and 7th June):
Now as this DB should have data in it for every day of the year (but not always matching the where clause) I thought I could get the count back using a sub-query and a coalesce, but that seems rather hacky to me.
I'm on MS-SQL Server 2000, any help would be greatly appreciated.
A little background first. I have a header table and a detail table in my staging area/ods. I need to join them together to flatten them out for load. The Detail Table is pretty deep - approx 100 million rows.
If I use the setting (table or view) and set the table name (say, the detail table), the package starts up nicely. But if I switch the OLE DB Source to using a SQL Statement and then join the tables in the SQL, then the Pre-Execute phase of the package takes a VERY long time. I have waited as long as 30 minutes for this phase to complete, but it never finished.
Another twist...If I take the join select statement out of the OLEDB Source and put it in a view on the server, then swith the OLE DB Source to look at the view using the (table or view) mode, then the package gets through the Pre-Execute phase just fine.
Can someone go into detail as to what the Pre-Execute phase does and why a deep table might make it take a long time? I know already that the pre-execute phase caches the lookups, but not much else.
When I execute the below stored procedure I get the error that "Arithmetic overflow error converting expression to data type int".
USE [FileSharing] GO /****** Object: StoredProcedure [dbo].[xlaAFSsp_reports] Script Date: 24.07.2015 17:04:10 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO
[Code] .....
Msg 8115, Level 16, State 2, Procedure xlaAFSsp_reports, Line 25 Arithmetic overflow error converting expression to data type int. The statement has been terminated. (1 row(s) affected)
is there a step by step paper to get there? here is what i need to consider. I Iwill have many customers that will need their own set of records and access pages "branded for their company" each customer will have many clients. I am hosting this application on a windows 2003 server with SQL 2005 server enterprise.
I am using windows authentication, I have created a username in windows, then i added the windows user in SQL management studio in security, granted "DB Read" and "DB write" and again under the database security tab. still from the web authentication fails. i must be nissing a step or two?
I expect to set up a username for each database as i setup new customers.
I'm currently working on a BI architecture for a customer, and consider to propose the Power BI data catalog as a data distribution layer. The customer will use Power BI, but also has other BI tools.
Are data sets in the data catalog available to other clients than Power Query alone? E.g. are there OData feed endpoints available? If not, what would be the best way to give other tools access to the data?
