The app is a small .exe to be installed in multiple machines. Each will access the db to get/update a field in a table and should be less than 1000 calls to it per day. I'm concern about the "locking" error message that I sometimes encounter (rarely) when running the program. Maybe increasing the default timeout would make it wait longer until the db is no longer locked?
View 2 RepliesI am just trying to figure something out. At work we have alot of data access code Ex:
[Code]....
Pretty standard stuff really, but I was at a training course recently where the Developers insisted on wrapping code, that seemed nothing more than expose exactly the same functionality.
I was interested in your thoughts as to whether this was a good idea. So the above would inherit from a DbHelper class with some thing like:
[Code]....
These would just expose the same but maybe a bit more generic i.e. using DbCommand as opposed to SqlCommand.
Is there a way to show CPU and RAM usage statistics on an asp.net page. I've tried this code but I have error:
Access to the registry key 'Global' is denied.
on this line:
ramCounter = new PerformanceCounter("Memory", "Available MBytes");
Is there anything missing in IIS 6.0 that prevents me from (Insert into table) using MS-Access?
Explain: The application works fine under Visual Studio 2008 IDE the insert into table works fine with no error, Also I tested with hosting provider and works fine with no problem. but now I have published the same exact app in a dedicated server windows 2003 with
IIS 6.0 .NET framework 2.0 with latest service pack I gave IIS_WPG write/modify access to the folder where MS-Access database is located and database but at the time of insert an error pop-up. I need to install in the Server or settings in the IIS to recognize my MS-Access db is it some office runtime that I am missing. (BTW I am using OLEDB connection string in my C# )
Using System.Data.OleDb;
I can retrieve data off of it with no problem but when I try to insert is when it fails I thought the problem was Access Rights but I do not think is the case.
Here's a short explanation of my asp.net project.
1) the default page loads, it will read the Windows Login of the user opening the page.
2) I'll check if this login exists in a table stored on the webserver.
In this Access Database, there's a 2nd linked table, pointing to another access table on a network location. Now, I want to read data from this linked table. However, at this moment I receive an error:
"The Microsoft Jet database engine cannot open the file '\<ip><shared-folder>statistics.mdb'. It is already opened exclusively by another user, or you need permission to view its data".
Some extra info:
- The network folder has read and write permissions for everyone
- the user and group permissions on both access files are set to read/modify/administer for the Admin user (on the tables I want to read from)
- IIS authentication on the server is set to "Windows Authentication" (this is needed so I can read the Windows Login from the user). All other authentication modes are disables (like anonymous, ...)
- When the error occurs, no other program or process has access to the statistics.mdb (so, it can't be locked by someone else)
- the web.config files access connection string looks like:
<add name="AccessConnectionString" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=\<IP><shared-folder>statistics.mdb;User Id=admin; Password=;" />
Like I said before, in this statistics.mdb file, there are 2 tables. One normal table, and another linked table (pointing to a network location)
Searching for solutions, I discovered the following:
- if I don't use linked tables, everything works fine (however, I have to use this linked table)
- even if I connect directly to the table in the network I receive the error. So, I'm pretty sure I don't have sufficient rights to read from this table.
I read that not the Admin user is opening the file, but actually a user called ASP.NET. This user doesn't have the correct rights to do this. However, I'm not sure if this is true.
I have a code to link to sql can anyone give me the same code for microsoft access....
try
{
int videoID = Convert.ToInt32(Request.QueryString["ID"]);
SqlConnection conn = new SqlConnection("server=WEBDESIGN-PC;database=Credentials;uid=sa;pwd=Azeem;");
conn.Open();
SqlCommand cmd = new SqlCommand("SELECT * FROM videopath WHERE videoID=" + videoID, conn);
SqlDataReader dtr = cmd.ExecuteReader();
dtr.Read();
FlashVideo1.VideoURL = Convert.ToString(dtr["Filepath"]);
Label1.Text = Convert.ToString(dtr["Filename"]);
conn.Close();
}
catch (Exception ex)
{
Label1.Text = Convert.ToString(ex);
}
finally
{
}
recommend a data access class / helper class for Access databases, similar to the sqlhelper class found in the (Data Access Application Block)?
View 6 Replies Can a query output made in MS ACCESS be accessed as a database in Visual Studio 2008?
I have a Parent and Child Table in MS Access with a one-to-many relationship. I created a query in Access that would produce a result table and I want the contents of this Query to be displayed in a Data Grid in Visual Studio 2008.
I made a project to use the access membership provider from [URL] and it works. But I need to edit my database but when I configure my database, I cannot see the tabel, I can only see the queries in mdb file. when I select the field from query, I am unable to update it. My code is as follows:
[Code]....
i am new to asp.net programming i am trying to connect asp.net web application with ms access 2007 database. i have taken with two text boxes and when i enter some data in it and press submit button the data must load in access db i created with same fields.
my code is :
[code]....
Syntax error in string in query expression what is the correct way of inserting data into access db and what is the Syntax error in string in query expression.
I have 4 file uploader in my form to upload 4 images in the DB for each article submitted. My issue when I want update/edit my article with some new pictures and I want delete or update the old pictures with the replacement with the new one.
How I can implement it? I am using ASP.NET based on VB.NOT .... NOT C#
I want a piece of code for asp.net 3.5 using visual basic. and i am using MS access database.
I have two three text boxes and 2 image upload controls and a submit button.
I want a piece of code in which a user can upload images and store it in our database . i want an asp.net visual basic working code. also i need query behind the submit button.
I have to display data (names) in a random order on the website. The data is stored in a MS Access database. The names must be displayed in a GridView and DataList in different places. I have created a query in MS Access "zorder: Rnd([MarinaAccommodation]![ID])" which works fine in MS Access giving me a different order each time.
The problem is that when I try run it on the website the order remains the same, it does not change each time the page is loaded.
I have a situation where I am accessing a database multiple times and I'm wondering if it is necessary.
I have a GridView with a template column with a hyperlink to "Get Results" and on the RowDataBound event I have it check the batch number against the database and see if results exist and then if they don't, hide the link.
So when viewing the page if there is 20 rows in the gridview it is effectively doing 20 queries.
I was wondering if it is a better idea to query the database once with all "batches" and load it into a datatable, then on the RowDataBound event query the datatable. The only issue I see with this is there is currently 40,000 batches and grows daily.
I have my code output a gridview with all the data with an option to select records. I'm trying to make a code which would allow me to select a record, and then print this record using a specific Report stored in MS Access.
I've located the code to print the Report it self, but it prints ether all the records or a range.
I want to Check Gr #(PK) of student wheter exist in table or not id exist show Msg in Label after lost focus from text box .. I tried AutoNumber in Access but it showing error while insertion
Note : im using form View control for insertion...
I am using ajax html editor to write a text. I can view it without having problem but I am incapeble of storing it in a Ms Access database. which type do I need to use for this? I tried memo and OleObject type and both didn't work. I used the blow code for that.
View 6 Repliesi am using the following code for a retrieving a image stored in access database
View 12 RepliesI have a data type mismatch while inserting into a number field in an access database using a parameterized query.I think this should be pretty simple but I am still learning a lot.
[Code]....
I have some commented out as I am working one field at a time. The working fields are textboxes and the non working ones are dropdown lists. But I think it may be the field that the list is drawing from? Not sure.
I have one question here.I created a registration form using asp.net and c#.
when I entered all the fields in that form and hit the register button the data will be inserted in to the database table called xyz table
in that table I have an id field which is a text field in access database consists of guid starting with letter P
when I inserting the data from aspx form...the guid is not inserting into the table.
one of my datarecord in that table with the id field is like this.(.P11111111-1BBB-4444-A9D1-111111111111)
need to insert anoother record in that table that field must be generate with the ID starting with P..its an guid.. the creating guid in the aspx.cs page..??
I have a form wilh couple of Drop downs and text boxes and a Data Grid View which displays data from Access Table. When I hit add button on the form, I can see the data being added to the Grid View. But when I close the form and open the Access Database File (.mdb), the respective table is empty. The Access Table is not being updated. Second time if I open the form, the Grid View is also empty.I am pasting my code here.
Public Class Home
Shared OleDbConnection As System.Data.OleDb.OleDbConnection
Shared ExpensesDataAdapter As System.Data.OleDb.OleDbDataAdapter [code]....
I want to retrieve a single column from a table in a database(ms access) and then the value retrieved has to be converted to a string!!
View 4 RepliesI am trying to create a DataReader to return a counted value from an Access Database. It all works if it finds some rows, but falls apart when there is no total.
My code is as follows (highlights);
[Code]....
The error that gets thrown is:
Description:
An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.IndexOutOfRangeException: BoxesOut
Source Error:
Line 43: if(reader2["BoxesOut"] != System.DBNull.Value)
Iam facing the problem with creating the Data Access layer using Dataset.xsd file and How to access the data from the file.
View 2 RepliesI have a SQL database. I am getting a datatable from SQL. In SQL Query the table is having null values in the output. But when it is coming to the front end, the null values are replaced by empty values.
So in the front end in the datatable i am having empty values in some cells. I am trying to insert this datatable into access. For this i am using following code...
OleAdpData.InsertCommand.Connection = OleConn; // OleConn is the OleDbConnection
OleAdpData.InsertCommand.Connection.Open();
OleAdpData.Update(dtData); // dtData is the datatable
OleAdpData.InsertCommand.Connection.Close();
It is inserting the datatable to access database. But it is inserting the empty spaces as present in the datatable. I want to insert NULL into the cells in access datatable where the cells are empty. Where should i add my logic for this.