ADO.NET :: Creating DataSets On Application_State?
Feb 5, 2011
I have a good bit of data that is generally static. I want to load it into my application so I can access the items from picklists without having to make redundant calls to the database. I have found a few articles discussing how I can approach this, but, I am specifically looking for a way to create a collection of DataSets with constraints at Application_Start. Also, when you do this kind of thing, do you normally create one dataset or a separate dataset per table? I know there are ways to add multiple tables to a single dataset, but, I don't know how to do this from the DataSet Designer.
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May 4, 2010
I am currently using datasets for my data access layer. I currently store the connection string in the web.config file. I need the ability to change the connection to another database before any queries are processed. Is there an event that is triggered or a base class that can be modified that intercepts the process of retrieving the connection string from the web.config file? Is there any way to handle multiple database connections using the same code base and also take advantage of the connection pooling? I understand the best method is to get rid of datasets and use custom data objects.
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Sep 23, 2010
How to link multiple DataSets (why SSRS call it a DataSet even there is only one bunch of data fields in it) using keys, then put data fields from multiple DataSets into one Data Region? The reason I have to do this is: There will be 6 major DataSets to be used together few times in same report, it is not make sense to build a huge Matrix for all of them together. (in some data region I use data from dataset A and B, some times I use data from dataset A and C, D ...)
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Nov 17, 2010
I have just started learning asp.net with c# and want to know how to write datasets to XML using asp.net.
Can anyone provide me any example or reference so that I can move ahead.
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Nov 13, 2010
I have two datasets, each of containing single column. I want to compare each row of first dataset with each row of second dataset and check if any match in the data.How can i implement such a login in VB.NET with minimum iterations.
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Mar 20, 2010
I have two datasets called ds and ds1 that I want to merge into a grid. I get data from the first dataset to display in the grid but the second dataset where I want to display a count I don't get any data from it. I am trying a ds.Merge(ds1). here is the code i have for the sub. What am I doing incorrectly?
Code:
[code]....
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Jan 25, 2010
I found an interesting discussion here:
[URL]
Quote:
DataSets are sub-par amateur solutions to code your Data layer...Stop Using Them and learn to CODE! :)
What is your opinion of DataSets vs. just stubbing out custom classes and working with those? What are other alternatives?
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Aug 26, 2010
I have imports.aspx with an ASP:FileUpload function.In my code-behind I have this:
SEPTA_DSTableAdapters.ServiceTBLTableAdapter sta = new SEPTA_DSTableAdapters.ServiceTBLTableAdapter();
SEPTA_DSTableAdapters.RoutesTBLTableAdapter rta = new SEPTA_DSTableAdapters.RoutesTBLTableAdapter();
protected void Page_Load(object sender, EventArgs e)
[code]...
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Mar 7, 2011
Now I know Datasets support disconnected operations. but does EF do the same thing?
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Feb 16, 2011
I am using Visual Studio 2010 now. I do not have network access to my database because of some connectivity issues. Are there any good articles on how to manually wireup Entity Framework objects manually? Or, is this just unrealistic?
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Apr 6, 2010
I want to serialize an object to json, so I'm using [Code]....
[Code]....
This is fine, but I want to return different json datasets depending on the circumstances. Lets say I have this object (a simplified example):
[DataContract]
class foo
{
[DataMember] int productId
[DataMember] string productName
double price; //not used in json.. yet
}
Which will serialize to a json object containing the product name & Id, but what if I also need to be able to return a different json object (say, productId and price but not name)? Can this be done somehow in the same object using WCF/DataContracts and DataMembers? This will be sent in an ajax query containing a collection of objects and needs to fast, so just including every member in every type of json request whether it's needed or not isn't a good solution.
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Jul 26, 2010
I was just thinking if there was a way to programmatically open and close connections to the database via the dataset classes we've added into the project.
I am trying to avoid one specific problem. Assume there is an EmployeeTableAdapter. It has two methods IsValid(string EmployeeID) and HasDepartmentAccess(string EmployeeID, string DeptID). Afaik each of these methods, open a connection, does data retrieval, and then closes it.
The opening and closing of the connection is done internally. I kind of want to override this, and close the connection upon a page unload event which (I'd manually register it with the datadapter class somehow).
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Nov 18, 2010
I have a dataset dsvalue that has columns Id and views. An other dataset has quite a number of columns including Id. So for each id in dataset ds, i should add a new column "Views" and merge it with views from dsvalue.
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Aug 26, 2010
I've a user table, and contact table linked to it, and appointments where contact are linked to it with users in this in it. need a report which show ...by user number of contact created by this user and number of appointment createdo i guess i need two datasets but how can I pass parameters between them to know what is the current user id ..?
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Apr 3, 2012
I have a website and it was running great but wanted to move my business logic/datasets over to its own project.
That seems to be working well, I can access my functions etc from my bl dll. But I cant access my tableadapters like i used to be able to directly.
Do I have to make classes that access all those tableadapters or am I missing some reference I need to add?
I seem to be able to get the dataset for example mydataset But the intellisense doesnt pull up mydatasettableadapter
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Nov 13, 2010
How do you control database server access when you use datasources in VB 2010?How do you access multiple tables from a store procedure using datasources?
Explanation:My experience is with VB.NET for the most part. I've written a lot of apps drawing data through dataadapters into datasets and processing them to provide reports in aspx.
I'm starting to work in VB 2010 and those elements are no longer available. What appears to be the weapon of choice is the datasource.What I'm not seeing: 2 important things that I can't work without:
1. Control over when the database server is hit with a connection request; daMyQuery.Fill (MyDataSet) was an explicit command that I could use to collect my data on demand. From that point on, I could use the dataset as I wished to populate whatever controls or structures I wished - the database server was no longer needed and wasn't hit by my apps until another pageload.
2. Multiple Tables in a query result; This must be there, I just can't find the method by which to reference different tables in my SQL output. Previous, I would have a dataadapter which would use a stored procedure to deliver a dataset of multiple - sometimes many - tables for use in the application. I can't find the equivalent on a datasource.
So my two big-ticket needs - requests for assistance, really - are listed above: How do you get at multiple tables returned from a stored procedure;and;How do you keep datasources for hitting the dbserver whenever you use it if there is no equivalent to a 'fill' method?
I guess another - how would you walk through the rows of a dataset?
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Mar 22, 2010
I have been thinking about the optimal way to create an XML file using data from a Dataset AND according to the rules of an XML schema. I've been searching around for a bit, and I failed to find a way in which I only take the data from the Dataset and put it inside a XML tags, with the tags being defined by an already-existing schema. So it might go like this:
1- Create Dataset and fill its rows with data.
2- Create an XML according to an XML schema rules.
3- Fill said XML file with data from Dataset such that data is taken from the Dataset while structure of the XML file is taken from the XML schema.
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Feb 18, 2010
i am using datasets as part of my web application architecture.
i have one dataset which has two tables which are populated from database . everything works fine but when i have change in stored procedure. i change structure of datatable in dataset file after that compilation errors start to throw up. when i check cs file of dataset it shows multiple classes with different names.
cant get into it. since im using datasets for first time. its getting frustating.
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Jan 6, 2011
I m working on ASP.NET using C#, i need to compare the data from two DataSets with a "ID" which is in both the DataSets and then add all the matching rows to a New dataset.
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Feb 9, 2011
I have two datasets, one is populated from a SQL Database on my server, the other is populated from an XML file passed from the client server.Both datasets are identical in structure (and potentially the same in data as well)hat I need to be able to do is as follows:-Compare Dataset1 against Dataset2 and record which rows are missing from Dataset2 (based on 2 primary fields)Compare Dataset2 against Dataset1 and record which rows are missing from Dataset1 (based on 2 primary fields)Compare Dataset1 against Dataset2 and record any rows which are different ((based on 2 primary fields always being the same and 3 fields being potentially different)
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Feb 22, 2010
I am updating a project I wrote some time ago. At the time my preference was for DataSets and DataSetTableAdapters, but I've now moved on to use Linq to SQL DataClasses. I would like to convert the project to Linq to SQL, but I am tight on time and it's a big job. My question is, is there any reasons I can't develop new modules using Linq to SQL DataClasses along side DataSets and convert the DataSets overtime?
Apart from the obvious confusion it will cause, are there any technical problems I should be aware of i.e. will there be any performance problems using the two methods?
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Apr 5, 2010
I have developed a web site that uses strongly typed datasets to access SQL. This has worked well: I have found that this is easy and robust, so that if I make changes to the data structure invariably I am either protected from this and my code continuesto work correctly, or there are compile errors that are obvious and easily fixed. Thus I am a fan of typed datasets.I am now starting to learn how to use web services, as I need to use the site's database with Windows programs. I have a web service with the following code, passing back a datatable: -
<WebMethod()> _
Public Function GDBSearch(arguments) As DataTable
Dim tbGDBSearch As DataTable = taGDBSearch.GetData(arguments)
[code]...
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Jan 24, 2010
I installed Windows 7 a few days ago and everything seemed to install fine. I opened up a rather large project I've been working on and opened up my dataset file. I created a new table in SQL Server 2005 and so in turn I created a new tableadapter. It went through the steps to create the tableadapter fine but when I tried to finish it, it took FOREVER to finally refresh. The table is small, about 6 fields with no data, and I waited 20 minutes at least for Visual Studio to finally respond again. Now I've tried to save my work and it's hung up again. I've been waiting another 20 minutes at least just for VS to save the file. Is there some known issue with datasets and Windows 7? This didn't happen in XP and I simply can't be waiting for an hour to simply add a table adapter and save the file.
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Mar 19, 2010
I have two datasets called ds and ds1 that I want to merge into a grid. I get data from the first dataset to display in the grid but the second dataset where I want to display a count I don't get any data from it. I am trying a ds.Merge(ds1). here is the code i have for the sub. What am I doing incorrectly?
[Code]....
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Mar 27, 2010
I've tried:
[Code]....
I've also tried:
[Code]....
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