Deleting Using SqlDataAdapter Via A Data Access Layer
Feb 20, 2008
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'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?
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.
HiI'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? protected void Page_Load(object sender, EventArgs e) { ProductsTableAdapter productsAdapter = new ProductsTableAdapter(); GridView1.DataSource = productsAdapter.GetProducts(); GridView1.DataBind(); }Thanks in advance
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 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).
I have a block of code that does a Fill() with a DataAdapter, which seems to throw an exception if no values are returned. Then, when I try to bind the DataSet that gets filled, an error occurs, it doesn't even try to bind the column headers or anything.
This process seems to work fine when some rows are found, but it is not always guaranteed that the row count will always be > 0. The nice thing about using the Fill() function, is that it creates all my column headers automatically, so I was just wondering if there's a way to do a Fill() then a subsequent DataBind() to a DataGrid which would automatically format the columns even when no rows are found?
Here's a bit of the source.. if the last line finds no rows, it throws an exception ( I assume this is normal):
strSQL = "SELECT * FROM Prods"; cm.CommandText = strSQL; da = new SqlDataAdapter( cm ); da.Fill(shelf);
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.
I thought I'd post this quick problem and answer, as I couldn't find the answer when searching for it. I tried to call a stored procedure on SQL Server 2000 using the System.Data.SqlClient objects, and was not expecting any unusual issues. However when I came to call the Fill method I received the error "Arithmetic overflow error converting expression to data type int." My first checks were the obvious ones of verifying that I'd provided all the correct datatypes and had no unexpected null values, but I found nothing out of order. The problem turns out to be a difference on the maximum values for integers between C# and SQL Server 2000. Previously having hit issues with SQL Server integers requiring Long Integer types in VB6, I was aware that these are 32-bit integers, so I was passing in Int32 variables. The problem was that Int32.MaxValue is not a valid integer for SQL Server. Seeing as I was providing an abitrary upper value for records-per-page (to fetch all in one page), I was simply able to change this to Int16.MaxValue and will hit no further problems as this is also well beyond any expected range for this parameter. If anyone can name off the top of their heads what value should be provided as a maximum integer for SQL Server 2000, this might be a useful addition, but otherwise I hope this spares others some hunting if they also experience this problem. James Burton
I can't delete records for a SQL Server table when I attached the table to Microsoft Access 97. I time out when I try to delete the record. However I can query the table.
I use the standard ODBC setup, do I need to do anything else beside using the standard Access link.
I am trying to delete tables from data where the ModifiedDates older than 9 years in AdventureWorks2012 database . I get console notified that foreign keys are dropped but the delete statement is throwing errors. I am sure that somewhere the key constraints are not getting altered, but i'm not able to figure it out as i'm a relative beginner to T-SQL. The error and code:
The DELETE statement conflicted with the REFERENCE constraint "FK_SalesOrderHeaderSalesReason_SalesReason_SalesReasonID". The conflict occurred in database "AdventureWorks2012", table "Sales.SalesOrderHeader [System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.SMO") | Out-Null $option_drop = new-object Microsoft.SqlServer.Management.Smo.ScriptingOptions; $option_drop.ScriptDrops = $true;
I don't know if the question has been nailed down. Aside from deleting tables, can we delete the *content* of data within the tables. It doesn't seem crazy that, if you can pull in data from a feed then you should be able to remove the content out again (without also destroying the user's meta-data work ). Reasons for this include:
- Security (a user may not have rights to see *my* data and should go refresh their own) - Size (workbook doesn't need to have GB's of irrelevant data saved to disk in a workbook if it was just useful during development phase to a pre-production data feed) - Bad data (pre-production data feed is not good data) - User-friendliness (data feed was refreshed 2 years ago and workbook was saved to file server. Users shouldn't be presented with irrelevant data, but should get empty pivot tables until they go do their refresh)
Obviously Excel internally knows how to clear out PowerPivot data, given the prompt shown here: [URL] ....
But how does a user initiate this on their own (corruption aside)?
Previous time this question was asked, without a real resolution: [URL] ....
We are running SQL Server 2005 express on Windows 2003. The database server gets significant amounts of data.
Because of the 4GB data limit we have a daily cron task which goes through and deletes data older then 90 days.
We would like a way to archive this data instead of deleting it. Is there any way to take data and compress it and store it in a different way, so that if needed, customers can query directly out from the compressed data? Cleary querying from compressed would be slower but that is ok.
Any other solutions that would allow us to archive data instead of deleting it? Thanks.
I have a package which loads data from a flat file (csv) to 4 tables in a database. Now, the load is incremental.
I want to clear the data of all 4 tables(in the database) before loading the data from flat file everytime.How can i do this? Iam using 4 Oledb Destinations, 1 multicast, 1 source component to do this. Also can it happen like a transaction? because if it deletes the existing data and couldnt load new data there will be a problem!.how to avoid this?
Hi i have to delete the master table data without deleting the child table records,is there any solution for this, parent table has relation with the child table. regards vinod.t.v
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
I have edited the aspnet_Users_CreateUser stored procedure so that the UserId that is created when a new user is created is copied to a UserId field in another table. However, when I use the website administration tool to delete users that have been created, it gives me an error saying the delete statement conflicted with the reference constraint. I then added the following code in the aspnet_Users_DeleteUser procedure.... IF ((@TablesToDeleteFrom & 16) <> 0 AND (EXISTS (SELECT name FROM sysobjects WHERE (name = N'vw_tt') AND (type = 'V')))) BEGIN DELETE FROM dbo.userclassset WHERE @UserId = UserId SELECT @ErrorCode = @@ERROR, @RowCount = @@ROWCOUNT IF( @ErrorCode <> 0 ) GOTO Cleanup IF (@RowCount <> 0) SELECT @NumTablesDeletedFrom = @NumTablesDeletedFrom + 1 hdhd END This code was then added to the function at the end which deletes the data from the aspnet_Users table when everything else has been removed (@TablesToDeleteFrom & 16) <> 0 AND Now when I delete a user in the website admin tool, it "deletes" (with no error) the user from the list but doesnt actually physically delete it from the database. Any ideas?
/****** Object: StoredProcedure [dbo].[dbo.ServiceLog] Script Date: 07/18/2014 14:30:59 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO ALTER proc [dbo].[ServiceLogPurge]
-- Purge records dbo.ServiceLog older than 3 months: -- Purge records in small portions to avoid locking production tables -- for a long time. The process takes longer, but can co-exist with -- normal usage of the tables.
[Code] ...
*** Getting this error below when executing the code ***
Msg 102, Level 15, State 1, Procedure ServiceLogPurge, Line 45 Incorrect syntax near 'Failed:'.
Edited by SomeNewKid. Please post code between <code> and </code> tags.
I have added a delete button to my datagrid, and put in what I think is the code to delete a member from the database at their Member ID, however when I have called a members details and the delete button is pressed, nothing happens!!?? Any ideas? Here is the code:
<%@ Page Language="VB" %> <script runat="server">
' Insert page code here ' Function GetMember(ByVal iD As Integer) As System.Data.SqlClient.SqlDataReader Dim connectionString As String = "server='localhost'; trusted_connection=true; Database='adp1SQL'" Dim sqlConnection As System.Data.SqlClient.SqlConnection = New System.Data.SqlClient.SqlConnection(connectionString)
Dim queryString As String = "SELECT [oga].* FROM [oga] WHERE ([oga].[ID] = @ID)" Dim sqlCommand As System.Data.SqlClient.SqlCommand = New System.Data.SqlClient.SqlCommand(queryString, sqlConnection)
sqlCommand.Parameters.Add("@ID", System.Data.SqlDbType.Int).Value = iD
sqlConnection.Open Dim dataReader As System.Data.SqlClient.SqlDataReader = sqlCommand.ExecuteReader(System.Data.CommandBehavior.CloseConnection)
Return dataReader End Function
Sub dgMember_Delete(sender as Object, e as DataGridCommandEventArgs) dgMember.EditItemIndex = -1
Sub btnView_Click(sender As Object, e As EventArgs) dgMember.DataSource = GetMember(memberID.Text) dgMember.DataBind() End Sub
Sub dgMember_SelectedIndexChanged(sender As Object, e As EventArgs)
End Sub Function DeleteMember(ByVal iD As Integer) As Integer Dim connectionString As String = "server='localhost'; trusted_connection=true; Database='adp1SQL'" Dim sqlConnection As System.Data.SqlClient.SqlConnection = New System.Data.SqlClient.SqlConnection(connectionString)
Dim queryString As String = "DELETE FROM [oga] WHERE ([oga].[ID] = @ID)" Dim sqlCommand As System.Data.SqlClient.SqlCommand = New System.Data.SqlClient.SqlCommand(queryString, sqlConnection)
sqlCommand.Parameters.Add("@ID", System.Data.SqlDbType.Int).Value = iD
Dim rowsAffected As Integer = 0 sqlConnection.Open Try rowsAffected = sqlCommand.ExecuteNonQuery Finally sqlConnection.Close End Try
my row in my data base consists of 12 coulmns, i have a duplicate values in 6 coulmns of it , i use select distinct for all it doesnt work for it it doesnot remove dupliacte , i cant make primary key or any constraint on this 6 coulmns together cause it contains duplicate values even if i choose ignore duplicate it doesnot work
example id name adress telephone job gender deprtment 1 john dd 123 doctor m 1st deprtment 1 john dd 123 doctor m 2nd deprtment
so there is duplicate on id, name,telephone, job , gender and different in department so how i make a primary key on id , name , adress , telephone , job , gender together
also how to delete duplicate from it although i used distinct function and it doesnit remove duplicate