helloo
Can I use "like" in datatable.select method??
meaning:
Dim exp As String = "c.cDesc like " & txtSearch.Text & " + N'%' "
Dim rows() As DataRow = dtCenters.Select(exp)
knowing that txtSearch.text has unicode characters
Hello.
I have 2 diffrent tables in the database, is it possible to select both of those back to c# on the same time?
I DONT want to combine the tables, just select them into 2 diffrent datatables in one select statement?
At the moment, i have something like:
function XXOpenDBCon();mCom.Parameters.Clear();mCom.CommandText = "Stuff_GetMovieCategories";myAdap = new SqlDataAdapter();myTable = new DataTable();myAdap.SelectCommand = mCom;myAdap.Fill(myTable);CloseDBCon();return myTable;
Can i ask the database to perhaos retrieve Stuff_GetMovieCategories and on the same time retrieve Stuff_MostViewedMovies?
So the SP does 2 select statements and returns them, i get in the function above 2 datatables with the information, one datatable with Categories and one table with MostViewedMovies.
Is this possible?
Hi,Has any one ever compared the performance of calling a DataTable'sSelect method with a stored procedure doing the same thing?My point is:dataRows = DataTable.Select(filter) is better orPassing paramters to stored procedure?The datatable holds about 500-700 rows at any given time.If I select one of the approaches the business logic will go intorespective layers.With dotnet in picture what would be a good approach- Have the data in Datatable and do a filter on the data or callstored procedures which has been the convention.Can some one pl. suggest?
View 3 Replies View RelatedFilling a DataTable from SqlQuery : If SqlQuery returns some null values problem ocurrs with DataTable.
Is it possible using DataTable with some null values in it?
Thanks
HiSQL Server 7.0 using stored procedures.I need to do a SELECT Top but I always need to find the record countfor the entire SELECT statement.ID Name-- ----1 Abraham20 Barrington32 Callaway54 Dennis58 EmmettIf I do a SELECT TOP 3, I'll get the required records but get arecordcount of 3.I cant use the ROWCOUNT method either becuase the recordcount willalso be 3.I can see two different options for getting back the information Ineed:1 - Run the select statement twice, first to retrieve the recordcountand then with top to get the recordset2 - Use a temp table to get the entire recordset and recordcount, andthen extract the Top N recordsI'd like to know if anyone has any other suggestions. Currently, I'mtempted to go for the second option....ThanksSam
View 5 Replies View RelatedIs there a method to convert "Select * From Table" to "Select field1,field2,...fieldn From Table" ?
Thanks
hiplz can any one tellHow should i use select method of SqlDatasourceplz show little code toothanks
View 1 Replies View RelatedHi guys,
I'm just curious if there is a prefered method when it comes to SELECT statements that include multiple tables. I have two versions:
SELECT FirstName, LastName, ProductName, SalePrice
FROM SALES, PRODUCTS, CUSTOMERS
WHERE MONTH(SaleDate) = '2'
AND YEAR(SaleDate) = '2005'
AND SALES.ProductID = PRODUCTS.ProductID
AND SALES.CustomerID = CUSTOMERS.CustomerID;
SELECT FirstName, LastName, ProductName, SalePrice
FROM CUSTOMERS
INNER JOIN SALES ON CUSTOMERS.CustomerID = SALES.CustomerID
INNER JOIN PRODUCTS ON PRODUCTS.ProductID = SALES.ProductID
WHERE MONTH(SaleDate) = '2'
AND YEAR(SaleDate) = '2005';
Could you tell me if either of these methods are favored over the other or if there is another way of producing the same output that is used over both these methods.
Thank you in advance
Butterfly82
I have a code that gives me the sample I am looking for, but only displays one field.
NuminHH is my field
7320EN_Var is my Table
Proof is the new table I want to create.
SELECT DISTINCT [NuminHH] INTO Proof
from 7320EN_Var
I have a interger stored in x.
I want to use x in a SELECT statement like so :
SELECT * from aTable WHERE A_Column = x
This select statement is then assigned to and passed as a string like :
sql = "SELECT * from aTable WHERE A_Column = x"
How does the x get interpreted correctly ?
Hi,I am trying to write a method which needs to call a stored procedure and then needs to get the response of the stored procedure back to the variable i declared in the method. private string GetFromCode(string strWebVersionFromCode, string strWebVersionString) { //call stored procedure } strWebVersionFromCode = GetFromCode(strFromCode, "web_version"); // is the var which will store the response.how should I do this?Please assist.
View 3 Replies View RelatedHi,
I just have a Dataset with my tables and thats it
I have a grid view with several datas on it
no problem to get the data or insert but as soon as I try to delete or update some records the local machine through the same error
Unable to find nongeneric method...
I've try to create an Update query into my table adapters but still not working with this one
Also, try to remove the original_{0} and got the same error...
Please help if anyone has a solution
Thanks
Hi I am trying to use the results of a datatable as an input to a ne SQL statement.
The datatable is created and populted by the source below after previously creating MyLookupCommand
MyLookupReader = MyLookupCommand.ExecuteReader(CommandBehavior.CloseConnection)
Dim Mydatatable = New DataTable()
Mydatatable.Load(MyLookupReader)
I now create a new SQL string allong the lines of
SELECT tableA.field1 FROM TableA INNERJOIN Mydatatable ON tableA.field2 = Mydatatable.Filed9
However I get the following error
Invalid object name 'Mydatatable'.
Any suggestions on how to resolve this.
possibley of interest is that I would have like to have done this in 1 SQL but the results in Mydatatable are from a SELECT DISTINCT and Field1 is a text filed that can't be used in a DISTINCT statement, hence using two statements.
Many thanks in advance
Hi,
I'm wondering if this is possible. I want to use a datatable as a parameter in my SQL query. The error I am getting is "No mapping exists from object type System.Data.DataColumn to a known managed provider native type." Any help is appreciated.
Here is the code.
Private Function GetAvailableTutors(ByVal qualifiedTutorsDataSet As DataTable) As DataTable
Dim TutorAvailabilityDataTable As DataTable = New DataTable()
Using myConnection As New SqlConnection(ConfigurationManager.ConnectionStrings("ASC_Schedule").ConnectionString)
Dim myCommand As SqlCommand = _
New SqlCommand("SELECT TutorID, TimeIndex FROM T_Hours WHERE SessionID > 0 AND TutorID IN (@TutorList) AND DateDropped > GetDATE() ORDER By T_QualifiedTutors.TutorID", myConnection)
myCommand.Parameters.AddWithValue("@TutorList", qualifiedTutorsDataSet.Columns.Item("TutorID"))
Dim myDataAdapter3 As SqlDataAdapter = New SqlDataAdapter()
myDataAdapter3.SelectCommand = myCommand
myDataAdapter3.Fill(TutorAvailabilityDataTable)
Return TutorAvailabilityDataTable
End Using
End Function
hi all
the usual way to bid a gridview is to data soursce
is there a way to do the folowing , creat a data table from the gridview shown valus " currunt page "
thanks
Hi,
I am experimenting to make a datatable in C# code in a page. This table should be a disconected table with Only valid for the present session.
I try the following code:
public partial class Default2 : System.Web.UI.Page
{
DataTable DT = new DataTable("TEST");
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DataColumn Col1 = new DataColumn("Col1");
Col1.DataType = typeof(Int32);
Col1.AllowDBNull = false;
DT.Columns.Add(Col1);
DataColumn Col2 = new DataColumn("Col2");
Col2.DataType = typeof(string);
Col2.AllowDBNull = true;
DT.Columns.Add(Col2);
DataColumn Col3 = new DataColumn("Col3");
Col3.DataType = typeof(DateTime);
Col3.AllowDBNull = true;
DT.Columns.Add(Col3);
GridView1.DataSource = DT;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
for (int i = 1; i < 20; i++)
{
DataRow MyRow = DT.NewRow();
MyRow["Col1"] = i;
DT.Rows.Add(MyRow);
}
}
}
For one reason or the other. if I click the button I get the message that Col1 dus not make part of the table TEST. It turns out that there are no columns added to the table. altroug the code in the page load part has been run. I suppose I have to do something with the session state to make my DataTable persistent, but I have no idea what. Can somebody help me out?
Thanks!
Rob
Is the merge method, what will work in this case ? I have two datatables with the exact same structure. How can I append the rows from table 2 onto the bottom of table 1 ? Is looping through the rows collection the only way ?
View 2 Replies View RelatedHi,Is it possible to store data that is retrieved by SqlDataSource in a... let's say... DataTable? I mean, If I dragged and dropped a GridView and an SqlDataSource and then I set up those controls in page designer in Visual Studio, is it possible at some time later to retrieve the data retrieved by the SqlDataSource and then store the data in a DataTable?Best regards,Haris
View 7 Replies View RelatedIs there a built in way of converting a LINQ qurey result into a DataTable or DataView ?
View 4 Replies View Relatedhai This is rameshi had a small doubt in this public DataTable GetStatelist() { DataTable returnValue = null; SqlCommand selcommand = new SqlCommand(); selcommand.CommandType = CommandType.Text; selcommand.CommandText = "select * from USER_MASTER"; selcommand.Connection = _connectionobject; try { _connectionobject.Open(); DataSet ds = new DataSet(); SqlDataAdapter ada = new SqlDataAdapter(selcommand); ada.Fill(ds); _connectionobject.Close(); return returnValue; ; } catch (Exception exception) { if (_connectionobject.State == ConnectionState.Open) { _connectionobject.Close(); } throw new Exception(exception.Message); } if (_connectionobject.State == ConnectionState.Open) { _connectionobject.Close(); } return returnValue; ; } after compiling its show the return value is nullwhat is error in my codinghow i can return the value to the corresponding function if (!IsPostBack) { GridView1.DataSource=database.GetStatelist(); GridView1.DataBind(); } i am waiting for the result
View 4 Replies View RelatedI am fetching records from a table and putting in a datatable using the "sqlda.fill(datatable)"
when i see the datable in "data visualizer" i find no rows.
It is confused eventhough it does not throw any error
Do I have to save the datatable into sqldatasource's SELECT results? if yes , how?
View 4 Replies View RelatedI have a table containing prices. This table will be queried very often to provide quotes for clients.So to ease the burden on the server I want to cache the table and then just query the cached version.However it seems that I can only cache the table as a datatable. This means I have to query the datatable to get the prices for each quote.I'm not sure how to query a datatable. Is ther syntax similar to querying a SQL table?In fact is this best way to go about things?Any help would be appreciated.G
View 4 Replies View Related
Hi...
In my appllication, i am having a DataTable... For that DataTable i have to write a query for a expression... This epression is more of mathematical expression type. Here is the sample expression-
(column1 < 1 && (column2 = 2 || column3 > 5) || column4 != 3)
How i can write a query for such a equation...? Is it possible to use logical & mathematical operator in the equation & to write a query for this type of equation... Is there is any good article on this...
Thanks in adavnce...
IamHuM
I have the following: Dim ResourceAdapter As New ResourcesTableAdapters.ResourcesTableAdapter Dim dF As Data.DataTable = ResourceAdapter.GetDataByDistinct Dim numRows = dF.Rows.Count Dim dS As Data.DataTable = ResourceAdapter.CountQuery Dim sumRows = dS.Rows.Count DataList1.DataSource = dF DataList1.DataBind() LblCount.Text = numRows LblSum.Text = sumRows numRows is the number of records in a particular category. CountQuery is a method that returns the total number of records in all the categories. I don't know how to get the result of that query, the code line in bold isn't right. How do I get this number?Diane
View 5 Replies View RelatedI'm trying this code but nothing is being displayedSqlConnection conn = new SqlConnection(ConfigurationManager.AppSettings["STRING_CON"]);
SqlDataAdapter da = new SqlDataAdapter("my_sproc", conn);DataTable dt = new DataTable();
DataRow dr;
//Adding the columns to the datatabledt.Columns.Add("CategoryIdIn");
dt.Columns.Add("CategoryNameVc");foreach (DataGridItem item in gd_freq.Items)
{
dr = dt.NewRow();
dr[0] = item.Cells[0].Text;
dr[1] = item.Cells[1].Text;
dt.Rows.Add(dr);
}//ForEach
da.Fill(dt);
gd_freq.DataSource = dt;
gd_freq.DataBind();
Can you use a DataTable to update an SQL Table and can it be done in a batch UPDATE as opposed to incrementing through every row using a stored procedure similar to UPDATE SQLTable SET Position = @Position WHERE ID = @ID?
View 3 Replies View RelatedI'm trying to use the SQL Bulk copy class to bulk import from a text file.I'm getting the following error: Line 24: bulkCopy.WriteToServer(CreateDataTableFromFile()); System.Data.SqlClient.SqlException: An error has occurred while establishing a
connection to the server. When connecting to SQL Server 2005, this failure may
be caused by the fact that under the default settings SQL Server does not allow
remote connections. (provider: Named Pipes Provider, error: 40 - Could not open
a connection to SQL Server) I've even tried to allow remote connections thro pipes and restarted the database engine but to no avail. Any inputs/suggestions?
I am quite new to ASP.net 2.0. I have had plenty of experience using ADO.net in standard windows applications.
In my app I am opening a connection to an SQL database and I am creating a DataTable without a DataSet:
Shared m_cnADONetConnection As New System.Data.SqlClient.SqlConnection
Shared m_daDataAdapter As System.Data.SqlClient.SqlDataAdapter
Shared m_rowPosition As Integer
Shared m_dtContacts As New System.Data.DataTable
I am initializing everything and filling my DataTable when the Page first Loads if it isnt a postback.Protected Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Form1.Load
If Not Page.IsPostBack Then
m_rowPosition = 0
m_cnADONetConnection.ConnectionString = "Data Source=.SQLEXPRESS;AttachDbFilename=C:First ASP DatabaseApp_DataMyFirstDatabase.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"
m_cnADONetConnection.Open()m_daDataAdapter = New System.Data.SqlClient.SqlDataAdapter("Select * From Books", m_cnADONetConnection)m_cbRefillCommand = New System.Data.SqlClient.SqlCommand
m_daDataAdapter.Fill(m_dtContacts)
Me.ShowCurrentRecord()
End IfEnd Sub
The Me.ShowCurrentRecord Sub assigns the values of the current record(row) in the DataTable via (m_rowPosition) to TextBox controls on the form:
I also have record navigation buttons on my form: << < > >> Moving me from record to record (row to row) by incrementing or decrementing m_rowPosition
All is good! I am able navigate the DataTable and the textboxes change their text properties accordingly from record to record.
The only other control on my form is a button which I'm coding its click event to save changes that I made to the current row (record) by changing the values in the textboxes then clicking save.
Here is my code:Protected Sub ButtonSave_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ButtonSave.Click
If m_dtContacts.Rows.Count <> 0 Then
m_dtContacts.Rows(m_rowPosition).BeginEdit()m_dtContacts.Rows(m_rowPosition)("Title") = TBTitle.Text
m_dtContacts.Rows(m_rowPosition)("Author") = TBAuthor.Textm_dtContacts.Rows(m_rowPosition)("YearPublished") = TBYearPublished.Text
m_dtContacts.Rows(m_rowPosition)("Price") = TBPrice.Textm_dtContacts.Rows(m_rowPosition)("LastReadOn") = TBLastReadOn.Textm_dtContacts.Rows(m_rowPosition)("PageCount") = TBPageCount.Text
m_dtContacts.Rows(m_rowPosition).AcceptChanges()
m_dtContacts.Rows(m_rowPosition).EndEdit()
m_dtContacts.AcceptChanges()
m_daDataAdapter.Update(m_dtContacts)
End Sub
After I click save I can navigate through my records and back to the one I just changed and updated and all is well. The changes were made in the table.
However, when I close the page and exit out of Visual Web Developer and reopen the database: THE CHANGES WERENT UPDATED!!!
This worked all the time in VB2005.net when developing a standard windows app.
Can I use the same approach I was using in my code above or am I missing something.
I have read and searched all over and what I'm thinking is that my UpdateCommand, InsertCommand, DeleteCommand, SelectCommand are empty.
Do I have to do it this way?
Hi, I have the code below. I need to skip the first row in the datatable as it has the headers. This works now, but my gridview gets the header row inserted as a record.Private Shared Sub InsertData(ByVal sourceTable As System.Data.DataTable, ByVal destConnection As SqlConnection) ' old method: Lots of INSERT statements ' first, create the insert command that we will call over and over: destConnection.Open() Using ins As New SqlCommand("INSERT INTO [tblAppointmentDisposition] ([contactdate], [dnbnumber], [prospectname], [businessofficer], [phonemeeting], [followupcalldate2], [phonemeetingappt], [followupcalldate3], [appointmentdate], [appointmentlocation], [appointmentkept], [applicationgenerated], [applicationgenerated2], [applicationgenerated3], [comments], [newaccount], [futureopportunity]) VALUES (@contactdate, @dnbnumber, @prospectname, @businessofficer, @phonemeeting, @followupcalldate2, @phonemeetingappt, @followupcalldate3, @appointmentdate, @appointmentlocation, @appointmentkept, @applicationgenerated, @applicationgenerated2, @applicationgenerated3, @comments, @newaccount, @futureopportunity)", destConnection) ins.CommandType = CommandType.Text ins.Parameters.Add("@contactdate", SqlDbType.Text) ins.Parameters.Add("@dnbnumber", SqlDbType.Text) ins.Parameters.Add("@prospectname", SqlDbType.Text) ins.Parameters.Add("@businessofficer", SqlDbType.NVarChar) ins.Parameters.Add("@phonemeeting", SqlDbType.Text) ins.Parameters.Add("@followupcalldate2", SqlDbType.Text) ins.Parameters.Add("@phonemeetingappt", SqlDbType.Text) ins.Parameters.Add("@followupcalldate3", SqlDbType.Text) ins.Parameters.Add("@appointmentdate", SqlDbType.Text) ins.Parameters.Add("@appointmentlocation", SqlDbType.Text) ins.Parameters.Add("@appointmentkept", SqlDbType.Text) ins.Parameters.Add("@applicationgenerated", SqlDbType.Text) ins.Parameters.Add("@applicationgenerated2", SqlDbType.Text) ins.Parameters.Add("@applicationgenerated3", SqlDbType.Text) ins.Parameters.Add("@comments", SqlDbType.Text) ins.Parameters.Add("@newaccount", SqlDbType.Text) ins.Parameters.Add("@futureopportunity", SqlDbType.Text) ' and now, do the work: For Each r As DataRow In sourceTable.Rows For i As Integer = 0 To 16 ins.Parameters(i).Value = r(i) Next ins.ExecuteNonQuery() 'If System.Threading.Interlocked.Increment(rowscopied) Mod 10000 = 0 Then 'Console.WriteLine("-- copied {0} rows.", rowscopied) 'End If Next End Using destConnection.Close() End Sub
View 3 Replies View RelatedI'm reading XML data into a DataTable that is populated into a datagrid. From here I need to update database and wanted to know how to Fill a DATA ADAPTER with a DATA TABLE?
I'm familiar with updating using a SQL command, but in this case, i have the dataTable already created from XML.
Please help.
Thanks,
With C#, ADO.net, and SQL Server, is there an easy way to run some sort of query that will return only the structure of a table but not have any data in it? Put another way, I want to create a DataTable that is empty but has exactly the same columns as its associated Table in SQL Server.Robert W.
View 3 Replies View RelatedPlease help guys,I have a DataTable filled from the parsing of a csv file by the OleDb text driver.This DataTable could on occassion contain in excess of 2000 rows.I want to be able to batch the inserts to my backend sql table and be able to recorver on errors during the insert.i.e, maybe send the first 500 rows to insert via an insert dynamic text.... really don't know the optimal insert technic to use.but, if I get an error on say the third batch, I want to be able to recorver, and not have to start all over again and continue the inserts from the batch that failed.....Please help... what is the best way to perform the inserts and how can I track these inserts and recorver on errors like power failures or sql server unavailable etc.Please help....
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