DataSource Controls :: SQLDataAdapter Postback / Create A Class, DataCommon, To Contain All SQL Data Manipulation Functions?
Apr 22, 2010
I'm trying to create a class, DataCommon, to contain all my SQL Data manipulation functions. I've created a Subroutine called Init that initializes a SQLDataAdapter:
[Code]....
From my other classes I am creating an instance of DataCommon, calling Init, and calling another subroutine in DataCommon that pulls data from SQL and loads the data into my dataset. This part is working great -- no problems at all. I'm loading three different Datatables in the Dataset with no issues.
At this point, I'll perform my various manipulations on the datatables -- add/delete/modify rows -- again with no problems. All of this is creating postbacks...and this is where my problem begins. After I've done all my manipulations to the data and am ready to update my SQL tables, I have to re-initialize my SQLDataAdapter. I thought I could do something like:
[Code]....
But I get the error: Exception inserting Class. Thread was being aborted.
In my initial data load from SQL, each datatable is getting loaded from a single SQL table, so I was hoping to use the autogenerated Update/Insert/Delete statements by the SQLDataAdapter. As a test, as soon as I filled the dataset initially, I added a new row to one of the datatables and used the SQLDataAdapter.Update() method before a postback occurred, and it worked perfectly.
So, with all that being said, I guess my question is, how do I reconnect the table mappings between my SQLDataAdapter and dataset to autogenerate the updates after a postback occurs? I've tried researching this, but I get confused after reading about FillSchema vs TableMappings vs everything else I've read about.
View 2 Replies
Similar Messages:
Feb 2, 2011
I have several Include files in asp classic that I would like to convert to the class in C#, I have bunch of variable, Constraint, functions, DB connection. Is class the best way to convert them?
View 2 Replies
Jan 26, 2010
I'm using the following query as an SqlCommand:
[Code]....
It obviously doesn't work...what can I do? I cannot use the "Merge" method, because I am working with several tables in a single SELECT statment.
View 2 Replies
Feb 22, 2011
First time using a dataset instead of a data reader, and I'm trying to fill both a datalist on my page, and set the selected item value for a drop down list. The datalist on the page is displaying properly, but I get this errorClass 'System.Data.SqlClient.SqlDataAdapter' cannot be indexed because it has no default property. when trying to set the selected value for the drop down list. Why can't I get the selected value for the drop down list to work properly?
[Code]....
View 3 Replies
Jun 4, 2010
trying to merge two sets of data from a SqlDataAdapter and an OleDataAdapter and then populate a gridview on a button click. If I run just the SqldataAdapter on its own the grid populates as expected. This also applies to the OleDataAdapter. The problem arises when I try to merge the two. I get an empty table, hence dt3 is not populating. The code i'm using is below.Does anyone know why this doesn't work?
[Code]....
View 2 Replies
Jan 26, 2010
I have the following sub that I need help with an error on. When run error message is saying that the parameter called by the stored proc was not supplied. Am I missing something? I can't seem to find it.....
[Code]....
View 4 Replies
Jan 28, 2010
Would anyone know how to pass a variable to SqlDataAdapter. Here is my code.
TextBox1.Text = 1
Dim textboxval
As
String
textboxval = TextBox1.Text
connection.Open()Using connection
As
New SqlConnection("Data Source=CHRIS-PCSQLEXPRESS;Initial Catalog=TorGHL;Integrated Security=True")
Dim dapubcb
As
New SqlDataAdapter("SELECT [BarName], [MenuSubId], [Address], [PhoneNo], [BarURL], [Email]
[BarDescription], [Id], [bg_long], [bg_lat] FROM [BarDetails] WHERE [MenuSubId] = texboxval ", connection)
View 5 Replies
Apr 9, 2010
string connectionString = (string)
ConfigurationSettings.AppSettings["ConnectionString"];
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand command = new SqlCommand("INSERT_PERSON",connection);
command.CommandType = CommandType.StoredProcedure;
command.Parameters.Add(new SqlParameter("@Name",SqlDbType.NVarChar,50));
command.Parameters["@Name"].Value = txtName.Text;
command.Parameters.Add(new SqlParameter("@Age",SqlDbType.NVarChar,10));
command.Parameters["@Age"].Value = txtAge.Text;
connection.Open();
command.ExecuteNonQuery();
connection.Close();
Above is my code.
I has more than 100 methods like this, so every time i'm opening the connection and close it, this will take too much of time, what i think is instead of this i would like to create the class for Connection open, that class will check whether the connection is closed or Broken then Open it(like SqlHelper.cs) so without big change on my methods, how to create that class and how to access that class from my methods.
View 5 Replies
Jan 24, 2010
I'm trying to add new rows to a data table and then use the sqldataadapter update method bu fund some problems. First, I written this code:
[Code]....
Excuse me but the most part of variable are in italian, however I think it is possible to understand how does it work. If I execute this code I obtain this error:
System.InvalidOperationException: Update requires a valid InsertCommand when passed DataRow collection with new rows.
After this I added these lines of code just above the last line:
SqlCommandBuilder cb = new SqlCommandBuilder(adapter);
adapter.InsertCommand = cb.GetInsertCommand;
and I obtained this error:
Cannot convert method group 'GetInsertCommand' to non-delegate type 'System.Data.SqlClient.SqlCommand'. Did you intend to invoke the method?
View 2 Replies
Jun 8, 2010
In am using following code for paging purpose in asp.net to reduce the load of reading all the records from the database.
SqlDataAdapter.Fill(StartRecord,MaxRecords, DataTable);
I want to know whether this code Get all data from data base and filter the records in application or just fetch the needed records only.
View 4 Replies
Aug 24, 2010
I have a database linked to a calendar. I had a peice of code that retrieved dates from a database and populated the calendar. I wanted to tidy up my code using stored procedures (they seem neater & i assume there's a benefit somewhere). so i came up with this, however it's not working. The calendar displays, but it's not being populated with the database entries. The SqlCommand & SqlParameter I have working elsewhere in my code; as with the SqlDataAdapter (which also worked before i tried to conver to a storedprocedure!) but combining these three (SqlCommand, SqlParameter & SqlDataAdapter) seem to be causing me problems.It's probably something stupid but if someone could take a look and point me in the right direction,
[Code]....
[Code]....
View 2 Replies
Mar 3, 2010
I am developing a couple of small ASP.NET application and would like to know what pattern. approach do you use in your projects.
My projects involve databases, using Data access and Business logic layers.
The data-access approach that I was using so far is the following(I read in some book and liked it):
For DAL layer:
Creating an abstract class that will define all database manipulation methods to implement.
The abstract class will contain a static "Instance" property, that will load (if instance == null) an instance (Activator.CreateInstance) of the needed type (a class that implements it).
Creating a classes that implement this abstract class, the implementation will be according to the databases (SQL, mySQL and etc) in use.
With this I can create different implementation according to database in use.
For BLL layer:
A class that encapsulates all all retrieved fields , and static methods that will call the DAL classes.
View 3 Replies
May 5, 2010
I want to create a LINQ DataContext Class as per Database Design. I getting a problem in some cases.
the syntax to bulid a LINQ class :
[Code]....
Here Table Name Is HardCoded But I my case my Table Name A Changed as Finicial Year Change.So How I Give The TableName As RunTime
View 8 Replies
Apr 30, 2010
getting the Parameters declared in an sql function in the C# code. We can actually get the parameters from a Stored Procedure by giving SqlCommandBuilder.DeriveParameters
Similarly is there any way to get the Parameters from the SQL Function.
View 2 Replies
May 30, 2010
Is it possible to use Exec statement in SQL Functions
like..
[Code]....
View 4 Replies
Apr 6, 2010
I'm trying to view a list of uses that have the execute ability on a function, but I cannot find a method to do so.
View 2 Replies
Feb 23, 2010
I would like to have more control over how information is presented in my ToolTip. Is it possible to display this:
High value: 90 Low value: 10
Like this:
High value: 90
Low value: 10
View 2 Replies
Jan 21, 2011
I have a member function that does not depend on any member variables of the class. (in my case the class is an ASP.Net Page)
The function is protected, I dont need it outside of this class. Its only purpose is to build an URL from an given object.
Should I make all my functions static if they dont depend on the class, even if they are not used outside of this class?
View 6 Replies
Nov 25, 2010
I have created class in C# i need to use objects from this class to add them to a databse table.
the information come from textbox go into the object of the class than from this object i want to preform databse function.
View 2 Replies
Jan 14, 2010
My head aches from beating it against the wall for so long. I have a gridview that is populated from a code behind table. The gridview has 3 bound lables, a checkbox (unbound) and another label (unbound). All fields are in template fields. I have coded a vb sub with one command: beep. It fires perfectly every time a user checks the gridview ckeckbox. Here are the columns of the gridview:
1. Player - bound label
2. Description- bound label
3. Amount- bound label
4. ToPay - ckeckbox
5. AmountToPay - unbound label
When a gridviewrow's checkbox is checked (or unchecked) the code determines the check status. If it is checked then the AmountToPay label is to display the same value of the third label (Amount) or it will clear it's text value if the checkbox is unchecking the box. Here is my code:
The gridview:
[Code]....
Here is the vb code that does beep():
[Code]....
I have tried about a dozen ways of reading the checked property of the checkbox but nothing works (sender, e, gridview, rows, items, cells, findcontrol, adnauseum). I want to work the code like this somehow:
If row.Checkbox.checkproperty=true then
set lblToBePaid.Text = the lblAmount.Text
Else
lblToBePaid.Text = ""
EndIf
View 5 Replies
May 14, 2010
I have a base class called BasePage, and a master page called SiteMaster. All my content pages inherit BasePage using BasePage instead of System.Web.UI.Page. Now, I need to access some functions in BasePage from my master page SiteMaster, let's say, the function is called "DisplayClientName()". How can I do it? Searched the Web, have found tons of similar questions but not solid solutions.
View 2 Replies
Mar 28, 2011
I have a form that's being databound with a SQLDataAdapter. I have a DropDownList with a SelectedValue='<%# Bind("FieldName")%>' on it. I was wondering if there was a way I could remove this field and set it dynamically in the codebehind and still have it insert the value of this field with the SQLDataAdapter. The reason for this is because the control I'm using doesn't have a separate InsertItemTemplate, only an EditItemTemplate which serves both purposes, and I need this to dropdownlist to only be databound on Insert.
Right now it's looking like I'll have to stop using the SQLDataAdapter and Update/Insert the data in the codebehind, but I wanted to see if there was something I was missing just-in-case.
View 1 Replies
Oct 8, 2010
I want to perform some functions on a ListBox when I click an HTML button but I to avoid postback to minimise the server round trips....
protected void Assign_Button_Click(object sender, EventArgs e)
{
Button clickedButton = sender as Button;
[code]....
View 2 Replies
Feb 9, 2011
Does anyone know if it is possible to create a gridview from a class on a seperate webpage?
So I have webpage 1, that calls Class 1, in Class one there will be a Select Query that will call some info from a database and then return it to a gridview. The gridview wont work obviously as it is in the class and not on webpage 1.
Is there anyway to reference the fact I would like the gridview created on webpage1?
View 1 Replies
Feb 16, 2010
I am not clear when do I want to use a webservice over a sqlDataAdapter for dataRetrieval. I want to populate a repeater control which I have been doing from a dataTable that I fill from a sqlDataAdapter. Is there criteria when I would want to use a webservice to fill my dataTable?
View 3 Replies
