i need expert opinion on saving data to database though efficient method/professional approach.I'm saving data using following code.[code]There are some other ways like, use Insert query, i want to know does above mentioned method take too much resources, or make db unnecessary busy
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I am making a windows form and through this form i want my users to upload and download files stored in a Directory on a machine running windows 2003.Could anyone please tell me the best and secure way to share files on a directory for users to Upload and download and "without letting the users to know the actual path"..User Clicks on a Button and it will automatically download the files from server.User Clicks on another Button and it will automatically upload the files to server.The file name and paths will be taken from labels which are hidden on my form so the user doesn't need to specify anything..I have 3 Options and looking forward to some expert opinion on this. My main concern is to never reveal the location to users and smooth upload and downloads.Is there any better option..i mean from my windows form perspective only and not talking about firewall settings, folder permissions etc...or any 3rd party software to protect data.[code]
View 2 RepliesI populate a datatable using a dataadapter. the select query pulls data from a view in which I combine multiple tables. Now I need to run different update statement etc to update each table. foe example I will update balance field in the accounts table using one query and another to update days present etc.
how should i do this? must i loop through each row in my datagridview?
What I have is a program that is going to monitor and store different stats about different email servers. The basic layout of the main form is a datagridview. Now this program does not need to store the information into a database as it is only going to run on one machine which is why I did not bind the datagridview to a dataset. Maybe using a datagridview is not the way I need to go but researching around the only other option would be to save the data to XML. However since the table does contain hidden fields with authentication credentials, I am a little bit hesitant about doing so.
View 3 Repliesi am couldnt able to insert datagrid view manually entered data to mysql db with other control datas together into 1 table.
so i made 2 table and in 1 inserting all grid data in other rest still i m getting the same error:
" you have an error in your SQl syntax; check the manual that coressponds to your mysql server version for right syntax to use near '",",",",")' at line 1"
my code is
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim conn As New MySqlConnection
[Code].....
can anybody please help me with my problem. I have a database and I view the data using a datagridview, the problem is I cant update my database using the datagridview properly because there is an error in my codes. I just cant understand what I should do to make it run. I know there are lots of post about updating database using the datagridview but none of them is the one I am using. Please review my codes and tell what is wrong.
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The error says that "the variable @a has already been declared..." As you can see I did not use the Me.Validate etc. to update my database because I do not know how to use them and I would like to focus on using this kind of codes in my program. This is the reason why the post about datagridview here are not useful for me.
I also included an example of what is being populated in the DataGridView from the xml file/schema from the start (see very bottom), which of course I'd like to be able to add more data to it via the DataGridView and then save it back to xml.
Private Sub Button2_Click_1(sender As System.Object, e As System.EventArgs) Handles Button2.Click
Dim dt As New DataTable("testtable")
dt.Columns.Add("Department", GetType(String))[code]..........
I am doing a small project and I am using vb.net with MS access database. I am facing a Concurrency issue sometimes when I try to save data in the datagried view. I have added the datagried view by dragding and drop the table from the data source. Only one user is using the form to save data at one time. I think it works properly unless I moved from record to record then it gives me an error. "Concurrency, 0 records updated from expected 1....."
View 8 RepliesI wrote small program which is able to open database using OpenFileDialog, then I added binding navigator (so I can navigate and make changes in my data set) and now I would like to SAVE data which I see in datagridview AS NEW FILE... I have a question: How to save data (and changes) from datagridview using SaveFileDialog?[code]
View 5 RepliesCode to add a new row to my datagrid on click of add button. I am not binding my grid to a datasource.I m fetching values from the database through a datatable n then through a lood inserting t values to my datagrid. i m not binding the entire datatable as my datasource for the grid.
View 2 Replies1) How can I load data from Text file to DatagridView. I want it because I'm making a listener. And when I load a data from text file, i want to edit rows. And this calling the second question.
2) How can I save data, Datagrid to Text file.
I found a code
Dim obj_oledb_da As System.Data.Odbc.OdbcDataAdapter
Public Function ConnectCSV1(ByVal filetable As String) As DataSet
Dim dataSet As New DataSet
[Code] .....
I can load data with this code but I can't save.
My Text File must be like this:
#IP
127.0.0.1 localhost
I have an editable datagridview that's been databound with dataadapter and datatable, and a normal button on a form. When i edit the dgv's cells and click the save button it fires the datagridview_cellvalidating event and if the cell validation is correct it updates and saves the current record to the datasource. Also, before save it commits change in any cell under editing.But when I use a toolstripbutton to do the same work, though it saves the dgv records but doesn't update the current change i.e. it saves the old records that are being fetched when the dgv was populated first during form load. Also, clicking the toolstripbutton doesn't fire datagridview_cellvalidating, datagridview_rowvalidating etc events.
What it seems to be is it's not commiting the change in any cell under
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I have a DataGridView that displays data from a SQL Server database. It allows the user to edit the data and save it back to the database. The way that data gets saved back to the database is something like this:
Dim da As New SqlDataAdapter
Dim cmdBuilder As New SqlCommandBuilder(da)
da.SelectCommand = New SqlCommand(sql, conn)
da.InsertCommand = cmdBuilder.GetInsertCommand
da.UpdateCommand = cmdBuilder.GetUpdateCommand
Dim cb As SqlCommandBuilder = New SqlCommandBuilder(da)
da.Update(dt)
This works fine when I'm saving to ordinary tables. However I also want to save to a view that has an instead of trigger that fires on insert, update and delete. When I try to use the above with this view I get the error:
"Dynamic SQL generation for the UpdateCommand is not supported against a SelectCommand that does not return any key column information."
How can I save to this view? I don't want to save directly to the underlying table because I want the trigger to fire.
I also tried manually generating the InsertCommand and UpdateCommand, but got the same error. It turned out I got the commands wrong when I manually generated them. Once I fixed that it worked fine - my view gets updated and the trigger fires as expected. I guess that you just can't autogenerate the commands for a view with SqlCommandBuilder.
I have 3 tables. customer,item, pricing, each with keys customerid,itemid,priceid. pricing is related to customer and item tables by a 1 to many.pricing (priceid,customerid,itemid,price)
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I have a dataset along with code for validation. When I use a datagridview and setting the EditMode to OnEnter I get the red exclamations telling me that I have an error when this is needed. This works all good. when I click the save button on the BindingNavigator, the application saves the record even when this validation is showing. How do I filter up this validation code through a datagridview and stop the program saving the data? If you need the code for more information, I will add this to the forum.
View 2 RepliesAny tutorial and maybe a sample project that can be downloaded that shows how to update a database such as MS Access from DataAdapter commands in which changes are made in a DataGridView? For example, the DataAdapter contains 2 tables called FirstTable and the other table would be called SecondTable. The DataGridView is based on a query that shows rows from both tables. The actual table that contains the rows to be changed, inserted or deleted is FirstTable.
View 6 RepliesI populate a datagridview using a bindingsource and dataadapter. So I join 3 tables in the view to get the data i need.
so I have my view as a child table in my dataset. and a table called classes which is the parent table. So when I select a Class(class 1A for example), my datagridview displays the pupils in that class.
Now i need to add another relationship in the dataset. so when I select a day in a monthcalendar, I need to add 5 checkbox columns for each day to my datagridview. Should I add these 5 columns to my datatable? i'm not sure what the best way is.
Then for each day I tick I have to save to my pupil_job_day table. I will save the peoleid,their accountid and the date. please help me
rewriting a class I use for saving Treeview data to a XML file for use of saving ListView data I can't really figure out the rewrite, I'm stucked, unfortunately Listviews seems to be a big problem for me in general.
Option Strict On
''' <summary>
''' The TreeViewDataAccess class allows the nodes within a TreeView to be
''' persisted to xml for later retrevial.
''' </summary>
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I have an application putting new data into a database so I want to use a DataGridView to display the data. I have a timer triggering every 5 seconds and running this UpdateGridFromDatabase() routine every cycle.
It works, but I can see my application memory usage going up by 10kB every 5 seconds until my computer with 6GB of RAm & 64 bit Windows 7 grinds to a halt! Can anyone see at a glance what I am doing wrong? I am trying to open & close everything as necessary. I have also dimmed two variables outside - I had then inside previously and it didn't make any difference.
im added a dataset inside my project, and inside the dataset i added a DataAdapter with the steps like below:Use SQLStatement --> select A,B from tb_example --> Fill a datatable.And then i bind one of my combobox datasource's display member = Avalue member = BAnd its work properly!After few weeks, im reopen the project and i try to add another new dataadapter in the previous dataset and a new combobox like steps i did before. When i come to the combobox and try to find the datasource in combobox's properties and i cant find the dataadapter i jz added.
View 7 RepliesHow to insert data into access database using dataadapter?
View 1 Repliesim having some problems using the data adapter. i tried a statement select 1'test' but when i do adapter.Fill(dataset, "tbl1") and tried to read the value from the first row in tbl1.hen i do row(0) i can retrieve the value. However if i do it by the name like sayrow("test") and i would get a dbnull.
View 9 Replies1. Can someone show me sample codes on how to do that ?
2. I encountered a problem with the INSERT sql statement. I keep receiving syntax error in insert statement exception. Is there anything wrong with the statement ?
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i am trying to update database with updated data in data adapter. here is error message. "Update requires a valid UpdateCommand when passed DataRow collection with modified rows." here is my code.i get this error when i try to update dataadapter with following line.
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In Microsoft Visual Basic 2005 Express Edition Version 8.0.50727.42 (RTM.050727-4200) and Microsoft .NET Framework Version 2.0.50727.
Right Click Toolbox--Choose Item--.NET Framework Components--Check on OracleConnection and OracleDataAdapter--Ok
Now double click OracleDataAdapter1 in the toolbox.Data Adapter Configure Wizard appears. Click on New connection.Add Connection dialoge box appears.Click on change.Change Data Source dialogue box appears.Here i am getting only 2 items:
1.Microsoft Access Database File
2.Microsoft SQL Server Database File
And in Data Provider combo box; only ".Net Framework Data Provider for SQL Server".I am not able to configure my OracleDataAdapter1 control by choosing above method.Machine have Oracle 10G Client and Server well installed. I am able to use Dim oda As New System.Data.OracleClient.OracleDataAdapter() and it is working fine; but i wish to configure oracledataadapter by using above method. Moreover, it is possible for me to configure oracledataadapter in Web Developer 2005 by above metohd, but not in VB.NET.
I am wanting to use the TableAdapers and/or DataAdapters that are stored in an XSD file ("A DataSet for using data in your application") to
1) delete data from SQL Server
2) insert data from a dataset to SQL Server.
the XSD is to be stored as a file outside of the application so that the same code (this code i am having difficulty with) can be used to upload data from different excel files.
I created the XSD file in VS 2005 and "Configured" each table adapter to generate: Select statement, Update statement, Delete statement, table mapping, Fill method, Get method, and update method.
I am searching for some generic code that will execute the update statement and populate the database with the data in the data set.
How do i retrieve the TableAdapter and DataAdapter information from dsXSD (or the file dsLoadData.xsd)?
And then use the data, especially if relationships exist between tables defining a specific order for the tables to be loaded...
Do the SQL Statement need to be dynamically (at run time) written?[code]...
I have an app that needs to read from and write to an excel worksheet. I have the read portion of code working just fine but I cannot for the life of me get it to save back taxt cahnges to the original file!! Th ecode I have so far is below.[code]...
View 3 RepliesWhen I run the following code I get two errors. The first is when I try to save a new set of data it tells me there is a "Syntax error in INSERT INTO statement". The second is when I try to save an update in tells me "No value given for one or more required parameters". I'm not sure why this is happening as before I added in Contact Deatails it saved fine.
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Currently I am saving data from my applications by saving a text file via a stream reader as a string. I have come to a problem. In my current application, I have an array of the following structure:
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