Hi,
What is the difference b/w sqldatareader and sqldataadapter? For what purpose are they used in a database connection & how do they differ from each other? Pls explain me in detail.
Regards
Vijay.
I am reading multiple databases into a single dataset, putting each read into a new datatable in the set. Ultimately, I want to merge the multiple tables (they are all from different DB tables in different locations using the same schema). I am also combining this with data from an Oracle database which is in yet another table in the same dataset.
Here is my question:
I will not be propagating any changes to this data back to its original source, but I will be populating it out to Active Directory. (Don't worry; I'm not asking any AD questions here.) But I do want to run SELECT, DELETE, and UPDATE queries against the data in the dataset in memory without writing it out to a separate file. Based on that type of usage, would I be better to use a DataReader or a DataAdapter to do the read from the original database? If I use a DataReader, can I still update the data in memory? In either case, what's the correct methodology to update data in a dataset in memory?
Thanks!
Why DataAdapter does NOT load relations from DB ?the relations are made using SQL SERVER MANAGEMENTbut when a fill a datatable using dataadapter the relations are not loaded .why ? what is the solution to this problem ?
View 1 Replies View RelatedHi i'm a new to ASP.NET and for some reason when i click the Next button in the code below, the pageIndex does not change. Please assist, Basically what i'm trying to do is to use DataAdapter.fill but passing in the start index and the number of records to pull from the dataset table.
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
public partial class Home : System.Web.UI.Page
{
//ConnectionOleDbConnection dbConn;
//discount that can be change by user using a gui interface
//CurrentPageint pageIndex = 0;double discount = 0.15 ;
protected void Page_Load(object sender, EventArgs e)
{
// homeGridView.Visible = true;
BindList();
}protected string getSpecial(string price,object sale)
{String special = "";if (sale.ToString().CompareTo("True") == 0)
{special = String.Format("{0:C}",double.Parse(price) * (1-discount));
}return special;
}
protected void BindList()
{
//Creating an object for the 'PagedDataSource' for holding the data.
//PagedDataSource objPage = new PagedDataSource();
try
{
//open connection
openConnection();
//sql commandstring columns = "*";
string SqlCommand = "Select " + columns + " from Books";
//create adapters and DataSetOleDbDataAdapter myAdapter = new OleDbDataAdapter(SqlCommand, dbConn);DataSet ds = new DataSet("bSet");
//create tableDataTable dt = new DataTable("Books");myAdapter.Fill(ds, pageIndex, 9, "Books");
Response.Write("Page Index: "+pageIndex);
//create table data viewDataView dv = new DataView(ds.Tables["bTable"]);
booksDataList.DataSource = ds;
booksDataList.DataBind();
myAdapter.Dispose();
dbConn.Close();
}catch (Exception ex)
{
Response.Write("Exception thrown in BindList()");
dbConn.Close();throw ex;
}
}
public void openConnection()
{string provider="Microsoft.Jet.OLEDB.4.0";
string dataSource = "C:/Documents and Settings/Owner/My Documents/Visual Studio 2005/WebSites/E-BookOnline/App_Data/BooksDB.mdb";dbConn = new OleDbConnection("Provider =" + provider + ";" + "Data Source =" + dataSource);
dbConn.Open();
}protected void nextClick(object sender, EventArgs e)
{
pageIndex=pageIndex+1;Response.Write("In nextClick"+pageIndex);
BindList();
}protected void prevClick(object sender, EventArgs e)
{if (pageIndex > 0)
{
pageIndex=pageIndex-1;
BindList();
}
}
}
I have done some reading on the dataadapter class, but do not have a good handle on how to work with dataadapter after it has been filled by a dataset. For instance, should I use an if statement such as this to update the value in the dataadapter? if (dsSunbelt.Tables[0].Columns[39].Equals("")) { DataRow drUpdate = dsSunbelt.Tables[0].Columns[39].Equals(DateTime.Now); } I am sure it is not hard to see what I am doing, and I hope that I am missing something small, but how do I isolate a dataadapter value to update in the corresponding database?
View 2 Replies View RelatedHi, I am populating a datagrid with data from one sql table, I add additional columns and then wish to write it back out to another table. I have written the following code to acheive this, however it keeps throwing the follwing exception - "Update requites a valid UpdateComman when passed a DataRow collection with modified rows"
I've looked and I can see what the problem is, can anybody help please?
Private Sub FillData()
'SQL connection
Me.sqlconnection = New System.Data.SqlClient.SqlConnection
Me.sqlconnection.ConnectionString = ConfigurationSettings.AppSettings("CuroConnection")
Dim sql As String
If Request("action") = "gen" Then
sql = "select item from tblPickList where GroupName = 'xxx'AND Category = '" & Category2 & "' ORDER BY item ASC"
ElseIf Request("action") = "fav" Then
sql = "select identifiertext as item from tblfavourites where HRID = " & Session("hrid") & " and type = 3 ORDER BY identifiertext ASC"
ElseIf Request("action") = "spec" Then
sql = "select item from tblPickList where GroupName = '" & GroupID & "' AND Category = '" & Category2 & "' ORDER BY item ASC"
End If
ds = New DataSet
da = New SqlClient.SqlDataAdapter(sql, sqlconnection)
Try
sqlconnection.Open()
da.Fill(ds, "tblPickListTemp")
sqlconnection.Close()
Catch ex As Exception
sqlconnection.Close()
End Try
ds.Tables(0).Columns.Add("HRID")
ds.Tables(0).Columns.Add("Flag")
'may possibly add a favourites column here at a later date to ensure no duplication
Dim dr As DataRow
For Each dr In ds.Tables("tblPickListTemp").Rows
dr("HRID") = Session("hrid")
dr("Flag") = 0
Next
DgrdFavourites.DataSource = ds
DgrdFavourites.DataBind()
End Sub
Public Sub CreateTempRecords()
'SQL connection
Me.sqlconnection = New System.Data.SqlClient.SqlConnection
Me.sqlcommand = New System.Data.SqlClient.SqlCommand
Me.da = New SqlClient.SqlDataAdapter
Me.sqlconnection.ConnectionString = ConfigurationSettings.AppSettings("CuroConnection")
Dim sql As String
sql = "Insert into tblPickListTemp (Item, HRID, Flag) values (@Item, @HRID, @Flag)"
sqlcommand.CommandText = sql
sqlcommand.Connection = sqlconnection
sqlcommand.Parameters.Add("@Item", "Item")
sqlcommand.Parameters.Add("@HRID", "HRID")
sqlcommand.Parameters.Add("@Flag", "Flag")
da.InsertCommand = sqlcommand
da.Update(ds.Tables(0))
End Sub
I'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,
i have this code :
if(! IsPostBack)
{
string strConnection = "server=localhost; uid=sa;
pwd=sasasa; database=northwind";
string strCommand = "Select * from Customers";
SqlDataAdapter dataAdapter = new
SqlDataAdapter(strCommand, strConnection);
DataSet dataset = new DataSet();
dataAdapter.Fill(dataset, "Products");
SqlCommandBuilder bldr = new
SqlCommandBuilder(dataAdapter);
DataTable dataTable = dataset.Tables[0];
dgCustomer.DataSource = dataTable;
dgCustomer.DataBind();
}
when i run this code, error like this appear :
Server Error in '/Registeration' Application.
SQL Server does not exist or access denied. 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.Data.SqlClient.SqlException: SQL Server does not exist or access
denied.Source Error:
Line 41: DataSet dataset = new DataSet();Line 42: Line 43: dataAdapter.Fill(dataset, "Products");Line 44: SqlCommandBuilder bldr = new SqlCommandBuilder(dataAdapter);Line 45: Source File:
e:asp.net
egisteration
egister.aspx.cs Line: 43
Stack Trace:
[SqlException: SQL Server does not exist or access denied.] System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction) System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction) System.Data.SqlClient.SqlConnection.Open() System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState) System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) Registeration.WebForm1.Page_Load(Object sender, EventArgs e) in e:asp.net
egisteration
egister.aspx.cs:43 System.Web.UI.Control.OnLoad(EventArgs e) System.Web.UI.Control.LoadRecursive() System.Web.UI.Page.ProcessRequestMain()
Version Information: Microsoft .NET Framework Version:1.1.4322.573;
ASP.NET Version:1.1.4322.573
how can i solve this problem??? thank you...
i have this code :
private void Page_Load(object sender, ....)
{
if(! IsPostBack)
{
string strConnection = "server=localhost; uid=sa;
pwd=**secret**; database=northwind";
string strCommand = "Select * from Customers";
SqlDataAdapter dataAdapter = new
SqlDataAdapter(strCommand, strConnection);
DataSet dataset = new DataSet();
dataAdapter.Fill(dataset, "Products");
SqlCommandBuilder bldr = new
SqlCommandBuilder(dataAdapter);
DataTable dataTable = dataset.Tables[0];
dgCustomer.DataSource = dataTable;
dgCustomer.DataBind();
}
}
when i run this code, error like this appear :
Server Error in '/Registeration' Application.
SQL Server does not exist or access denied. 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.Data.SqlClient.SqlException: SQL Server does not exist or access
denied.Source Error:
Line 41: DataSet dataset = new DataSet();Line 42: Line 43: dataAdapter.Fill(dataset, "Products");Line 44: SqlCommandBuilder bldr = new SqlCommandBuilder(dataAdapter);Line 45: Source File:
e:asp.net
egisteration
egister.aspx.cs Line: 43
Stack Trace:
[SqlException: SQL Server does not exist or access denied.] System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction) System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction) System.Data.SqlClient.SqlConnection.Open() System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState) System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) Registeration.WebForm1.Page_Load(Object sender, EventArgs e) in e:asp.net
egisteration
egister.aspx.cs:43 System.Web.UI.Control.OnLoad(EventArgs e) System.Web.UI.Control.LoadRecursive() System.Web.UI.Page.ProcessRequestMain()
Version Information: Microsoft .NET Framework Version:1.1.4322.573;
ASP.NET Version:1.1.4322.573
how can i solve this problem??? thank you...
hi
this is probably a piece of pie to fix but i be having some problems......
i have this peice of code to update the sql dataapadapter
Dstest1.Tables("test").Rows(0)("hello") = Me.textboxhello.Text
SqlDataAdapter1.Update(Dstest1, "test")
this does not work, it does work however if i replace the Me.textboxhello.Text
with a value in quotation marks or with another text box not linked to that feild in the table... it does not work with the relevant text box!!!!!!!!
thanks for all your help
cq
Hy, again! I am at the begining of an application. I have some modules that insert, delete and update only one row at one table. My question is should I use dataadapter.Update() or ExecuteNonQuery(). I prefer ExecuteNonQuery because I want to build a class : DataLayer to implement my own InsertProcedure(), UpdateProcedure(),DeleteProcedure(). I want speed in my application, so which is the best: dataadapter.Update() OR ExecuteNonQuery(). Thank you!
View 5 Replies View Related
Good day,
I just like to ask if anybody has experienced getting empty rows from SQL data adapter? I'm using SQL Server 2005. Problem is when the sql is run on Query Analyzer it retrieves a number of rows but when used in my application it returns 0 or empty rows.
I thought the connection is not the problem since I got my columns right. Below is my code snippet.
Thanks!
const string COMMAND_TEXT = @"select distinct somefield as matchcode, count(somefield) "
+ "as recordcount from filteredaccount where StateCode = 0 group by somefield having count(somefield) > 1";
SqlDataAdapter adapter = new SqlDataAdapter(COMMAND_TEXT, connection);
DataTable dt = new DataTable(sometablename);
adapter.Fill(dt);
For some reason I've had trouble with this today... can anyone provide me with a generic code snippet that programatically allows me to select data from a database limited by a parameter and then fills a datatable?
View 4 Replies View RelatedI am having trouble getting an Update call to actually update records. The select statement is a stored procedure which is uses inner joins to link to property tables. The update, insert, and delete commands were generated by Visual Studio and only affect the primary table. So, to provide a simple example, I have a customer table with UID, Name, and LanguageID and a seperate table with LanguageID and LanguageDescription. The stored procedure can be used to populate a datagrid with all results (this works). The stored procedure also populates an edit page with one UID (this works). After the edit is completed, I attempt to update the dataset, which only has one row at this time, which shows that it has been modified. The Update modifies 0 rows and raises no exceptions. Is this because the update, insert, and delete statements do not match up one-to-one with the dataset? If so, what are my choices?
View 1 Replies View RelatedHi,
I'm using DataAdapter.Update() to update data in a table. My question is; how do I create a trigger that works after the update has completely finished?
For example if my update adds 50 new rows to a table the trigger I've currently got fires after each new row that is added ie 50 times in total. Is it possible to get it to trigger after the last (ie 50th) row is added???
Thanks
hi friends,
i look forward an answer that solves my problem.
iam trying too populate a DropDown list . here is the codings. Previously it was working. suddenly,
it s generating error.
strConnectionString = "Provider = SQLOLEDB;Integrated Security=False; User ID=sa;Password=;Data Source=GIREESH-AC720F7;Initial Catalog=NorthWind"
in page_load event
dim sql as string
sql = "select AthleteNameKey from athletes"
result_adap = DbAccess.ExecuteAdaP(sql)
result_adap.Fill(result_ds, "athletes")
cboAthleteName.DataSource = "athletes"
cboAthleteName.DataTextField = "AthleteNameKey"
cboAthleteName.DataValueField = "AthleteNameKey"
cboAthleteName.DataBind()
Public Function ExecuteAdaP(ByVal sqls As String) As OleDbDataAdapter
'Dim ds As New OleDbDataAdapter
Dim da As New OleDbDataAdapter(sqls, strConnectionString)
'da.Fill(ds)
Return da
End Function
Hi,
I am trying to use DataAdapter.Update to save a file stream into SQl Express.
I have a dialog box that lets user select the file:
openFileDialog1.ShowDialog();
I want to put
openFileDialog1.OpenFile();
Into
this.documentTableAdapter.Update(this.docControllerAlphaDBDataSet.Document.DocumentColumn);
I am thinking that it might just be some syntax issue, but I looked online, and didn't find much answers.
Thanks,
Ke
Hi!
I am trying to insert data into 2 different tables. I am using dataadapter and dataset.
Protected Sub SubmitButton_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles SubmitButton.Click
Call ConnectionString()
Dim insertSQL As New SqlCommand()
insertSQL.Connection = sqlConn
insertSQL.CommandText = "SELECT location.CountryName, location.CityName, location.BuildingName, location.FloorID, rooms.name, rooms.FloorID AS Expr1 FROM location INNER JOIN floors ON location.FloorID = floors.id INNER JOIN rooms ON floors.id = rooms.FloorID"
Dim ds As New DataSet()
Dim da As New SqlDataAdapter()
da.SelectCommand = insertSQL
Dim scb As New SqlCommandBuilder(da)
Try
da.Fill(ds)
Dim ndr = ds.Tables("location").NewRow
Dim ndr2 = ds.Tables("rooms").NewRow
ndr("FloorID") = FloorIDDDL.SelectedValue
ndr("CountryName") = CountryNameTextBox.Text
ndr("CityName") = CityNameTextBox.Text
ndr("BuildingName") = BuildingNameTextBox.Text
ndr2("name") = RoomNameTextBox.Text
ndr2("FloorID") = FloorIDDDL.SelectedValue
ds.Tables("location").Rows.Add(ndr)
ds.Tables("room").Rows.Add(ndr2)
da.Update(ds)
ErrMsgLbl.Text = "Information saved successfully"
Catch ex As Exception
ErrMsgLbl.Text = ex.ToString
End Try
sqlConn.Close()
End Sub
The above code does not throw any error. It also does not update the tables.
Your help will be appreciated.
Thanks!
I'm using DataList to return vales stored in an SQL database, of which one of the fields contains the date the record was added.
I am trying to fill the dataset with items only from the last 30 days.
I've tried a few different ways, but all the database rows are returned.
What is the WHERE clause I sholud use to do this??
Thanks
My DataAdapter.Update() Method is running this query against my database and all the parameters and the formatting looks correct to me. I was wondering if anyone could identify obvious errors.... Thanks!
exec sp_executesql
N'NewUpdateCommand',
N'@Name nvarchar(50),
@PriContactFName nvarchar(50),
@PriContactLName nvarchar(50),
@PriContactWork nvarchar(20),
@PriContactFax nvarchar(20),
@PriContactCell nvarchar(20),
@PriContactEmail nvarchar(50),
@MainOfficeLocationAddr1 nvarchar(50),
@MainOfficeLocationAddr2 nvarchar(50),
@MainOfficeLocationCity nvarchar(50),
@MainOfficeLocationState nvarchar(50),
@MainOfficeLocationZip nvarchar(15),
@Description nvarchar(50),
@Original_ClientID int,
@ClientID int',
@Name=N'Brinker International',
@PriContactFName=N'Steves',
@PriContactLName=N'Maubley',
@PriContactWork=N'913-876-9876',
@PriContactFax=N'913-098-8765',
@PriContactCell=N'913-987-7654',
@PriContactEmail=N'a@b.c',
@MainOfficeLocationAddr1=N'1234 Burkwood',
@MainOfficeLocationAddr2=NULL,
@MainOfficeLocationCity=N'Tallahassee',
@MainOfficeLocationState=N'Florida',
@MainOfficeLocationZip=N'99111',
@Description=N'This is a good client.',
@Original_ClientID=1,
@ClientID=1
Msg 102, Level 15, State 1, Line 15
Incorrect syntax near 'NewUpdateCommand'.
My task is to bind and show 3 different values coming from three different queries into three different columns of GridView. I had done this as mention in below. Program was successful. But I want to excute these three queries in same Stored Procedure. I can do that and stored in seperated variables. I need help how to call these three different values in data adapters and store each value in three different columns of grid view.
Simply I want to below statement in stored procedures and call from program. Can any one help me plz.
con = DataBaseConnection.GetConnection();
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter("select isnull(sum(PA_DAmt),0) from PA_Deposits where PA_UID = @PA_UID", con);
da.SelectCommand.Parameters.Add("@PA_UID", SqlDbType.Int).Value = Convert.ToInt32(Session["PA_UID"]);
da.Fill(ds,"Dep");
SqlDataAdapter da1 = new SqlDataAdapter("select isnull(sum(PA_EAmt),0) from PA_Expenses where PA_UID = @PA_UID", con);
da1.SelectCommand.Parameters.Add("@PA_UID", SqlDbType.Int).Value = Convert.ToInt32(Session["PA_UID"]);
da1.Fill(ds,"Exp");
SqlDataAdapter da2 = new SqlDataAdapter("select isnull(sum(PA_IAmt),0) from PA_Income where PA_UID = @PA_UID", con);
da2.SelectCommand.Parameters.Add("@PA_UID", SqlDbType.Int).Value = Convert.ToInt32(Session["PA_UID"]);
da2.Fill(ds,"Inc");
string deposits = Convert.ToString(ds.Tables["Dep"].Rows[0].ItemArray[0]);
string expenses = Convert.ToString(ds.Tables["Exp"].Rows[0].ItemArray[0]);
string income = Convert.ToString(ds.Tables["Inc"].Rows[0].ItemArray[0]);
GridView1.DataSource = ds;
GridView1.DataBind();
GridView1.Rows[0].Cells[0].Text = "Total";
GridView1.Rows[0].Cells[1].Text = deposits
GridView1.Rows[0].Cells[2].Text = expenses;
GridView1.Rows[0].Cells[3].Text = income;
//The above program was success.
// This is another way I had tried. But failed. I am getting Index out of bound error. Can any solve this if possible to u.
SqlCommand cmd = new SqlCommand("select isnull(sum(PA_DAmt),0) from PA_Deposits where PA_UID = @PA_UID", con);
cmd.Parameters.Add("@PA_UID", SqlDbType.Int).Value = (int)Session["PA_UID"];
GridView1.Rows[0].Cells[1].Text = cmd.ExecuteScalar().ToString();
cmd.CommandText = "select isnull(sum(PA_EAmt),0) from PA_Expenses where PA_UID = @PA_UID";
GridView1.Rows[0].Cells[2].Text = cmd.ExecuteScalar().ToString();
cmd.CommandText = "select isnull(sum(PA_IAmt),0) from PA_Income where PA_UID = @PA_UID";
GridView1.Rows[0].Cells[3].Text = cmd.ExecuteScalar().ToString();
ASPX Code for Grid View
<h2>Account Summary</h2><br />
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" emptydatatext="There are no data records to display." Width="238px" >
<Columns>
<asp:TemplateField >
<ItemTemplate>
<asp:Label ID="Label1" runat="server" Text="Total"></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField ><%--HeaderText="Deposits"--%>
<ItemTemplate>
</ItemTemplate>
<HeaderTemplate>
<a href="Deposits.aspx" >Deposits</a>
</HeaderTemplate>
<ItemStyle HorizontalAlign="Center" />
</asp:TemplateField>
<asp:TemplateField >
<HeaderTemplate>
<a href="Expenses.aspx">Expenses</a>
</HeaderTemplate>
<ItemStyle HorizontalAlign="Center" />
<ItemTemplate>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField >
<HeaderTemplate>
<a href="Income.aspx">Income</a>
</HeaderTemplate>
<ItemStyle HorizontalAlign="Center" />
<ItemTemplate>
<%-- <%# Eval("Course") %>--%>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
Plz solve this.
HI!
as far as I know from docs and forum datareader is for .NET data in memory. So if a use a complex dataflow to build up some data and want to use this in other dataflow componens - could i use data datareader source in the fist dataflow and then use a datareader souce in the second dataflow do read the inmemoty data from fist transform to do fursther cals ?
how to pass in memory data from one dataflow to the next one (i do not want to rebuild the logic in each dataflow to build up data data ?
Is there a way to do this ? and is the datareader the proper component ? (because its the one and only inmemory i guess, utherwise i need to write to temp table and read from temp table in next step) (I have only found examples fro .NET VB or C# programms to read a datareader, but how to do this in SSIS directly in the next dataflow?
THANKS, HANNES
Hey guys, whats an easy way to pass a value into a stored procodure?
I tried the code below but I keep on getting a "Procedure 'sp_InsertData' expects parameter '@gpiBatchNo', which was not supplied." error. My stored proc basically gets inserts the passed variable into a databaseSqlConnection sqlSecConnection = new SqlConnection(sqlPriConnString);SqlCommand sqlSecCommand = new SqlCommand();
sqlSecCommand.Connection = sqlSecConnection;
sqlSecCommand.CommandText = "sp_InsertData";sqlSecCommand.CommandType = CommandType.StoredProcedure;sqlSecCommand.Parameters.Add("@gpiBatchNo", SqlDbType.NVarChar) ;
sqlSecConnection.Open();int returntype = sqlSecCommand.ExecuteNonQuery();
sqlSecConnection.Close();
This code is currently loading my DataGridView
How can i change this to use the Datareader
Dim myConnection As SqlConnection = New SqlConnection("Data Source=ANTEC30SQLEXPRESS;Initial Catalog=test;Integrated Security=True;Pooling=False")
Dim myCmd As SqlCommand = myConnection.CreateCommand()
myConnection.Open()
myCmd.CommandType = Data.CommandType.Text
myCmd.CommandText = "Select * From tblParts"
Dim myDataAdapter As SqlDataAdapter = New SqlDataAdapter(myCmd)
Dim myDataSet As DataSet = New DataSet()
myDataAdapter.Fill(myDataSet)
DataGridView1.DataSource = myDataSet.Tables(0)
Hi,
I am facing a problem to access datareader... actually i want to get data on lables from datareader. actually i am having one table having only one column and i hav accessed all data into datareader but the problem is that i just want to get data row by row...
For example there are four labels Label1, Label2, Label3, Label4
and want to print the data from datareader on to thease labels....
plz do reply... i am in trouble
i need help to know what is the best practice
i have a stored proc which returns 4 different resultselts
will that be easy to use dataset or datareader?
my purpose of using dataset/datareader is to load the data in a class
thanks.
Hi,
I cant seem to get this working right...I have a datareader which i loop through...i want to test each value to see if its null but i cant get the syntax right.
I know i use dr.item("columnname") or dr(0) to pick a certain column but i dont know the column names and want to check them all anyway. What is the syntax to do this.
Thanks for any help...this is prob very simple but just cant see it.
--------------------------------------------While dr.Read
If dr(0) Is System.DBNull.Value Then
Return "test"End If
End While
Hello i creae one programm, there is an two data reader and two Gridview or datagrid , and my programm have one error my programm is there using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Data.SqlClient;public partial class aries : System.Web.UI.Page{ SqlConnection con; SqlCommand cmd; SqlDataReader dr; SqlDataReader dr1; SqlCommand cmd1; protected void Page_Load(object sender, EventArgs e) { string str; str = ConfigurationSettings.AppSettings["DBconnect"]; con = new SqlConnection(str); con.Open(); cmd = new SqlCommand("select color from zodiac_color where Sno=1", con); dr = cmd.ExecuteReader(); GridView1.DataSource = dr; GridView1.DataBind(); cmd1=new SqlCommand("select number from zodiac_number where Sno=1",con); dr1 = cmd.ExecuteReader(); GridView2.DataSource = dr1; GridView2.DataBind(); }} i want to calll two value in a same database but the table is diffrent so please help me ?The error is ::--------- There is already an open DataReader associated with this Command which must be closed first. please help me ashwani kumar
View 2 Replies View Relatedhi to all , check this once..this all data related to bus seats SeatNo1,SeatNo2 seats varchar in databaseSt1,St2 status(bit in database sqlserver2000) All my code is working when reader[i + 2].ToString() == "True" is remove from code ..so plz tell me solution gow to ckeck status with datareaderSqlCommand command = new SqlCommand("Select SeatNo1,SeatNo2,St1,St2 from tblSts where
BUSID='S0008'", sqlCon);
sqlCon.Open();
SqlDataReader
reader = command.ExecuteReader();
int x =
0;
while
(reader.Read())
{
for
(int i = 0; i <= reader.FieldCount - 1; i++)
{
x = (i + 1);
System.Web.UI.WebControls.Label myLabel = ((System.Web.UI.WebControls.Label)(Page.FindControl(("Label"
+ x))));
System.Web.UI.WebControls.CheckBox myCheckbox = ((System.Web.UI.WebControls.CheckBox)(Page.FindControl(("Checkbox"
+ x))));
if
(reader[i].ToString() != "NULL"
&& reader[i + 2].ToString() == "True"))
{
myLabel.Text =
reader[i].ToString();
myCheckbox.Checked = false;
}
else
{
myLabel.Text =
reader[i].ToString();
myCheckbox.Visible = false;
}
}
}
sqlCon.Close();
Hi
In my web site I call all the content from the database with the use of querystrings. I use datareader to call the data each time a request appears from the querystring. Although I close all the connections I still get occasionally the following error:
Timeout expired the timeout period elapsed prior to obtaining a connection from the pool. This may have occured because all pooled connections were in use and max pool size was reached.
If it is not a programming error then what could it be? I use sql server 2005 and vs 2005 asp.net 2.0 .
"There is already an open datareader associated with this command which must be closed first."
I have received this same error before, but I'm not sure why I'm getting it here.'Create a Connection object.
MyConnection = New SqlConnection("...............................")
'Check whether a TMPTABLE_QUERY stored procedure already exists.
MyCommand = New SqlCommand("...", MyConnection)
With MyCommand
'Set the command type that you will run.
.CommandType = CommandType.Text
'Open the connection.
.Connection.Open()
'Run the SQL statement, and then get the returned rows to the DataReader.
MyDataReader = .ExecuteReader()
'Try to create the stored procedure only if it does not exist.
If Not MyDataReader.Read() Then
.CommandText = "create procedure tmptable_query as select * from #temp_table"
MyDataReader.Close()
.ExecuteNonQuery()
Else
MyDataReader.Close()
End If
.Dispose() 'Dispose of the Command object.
MyConnection.Close() 'Close the connection.
End With
As you can see, the connection is opened and closed, and the datareader is closed. Here's what comes next...'Create another Connection object.
ESOConnection = New SqlConnection("...")
If tx_lastname.Text <> "" Then
If (InStr(sqlwhere, "where")) Then
sqlwhere = sqlwhere & " AND lname like '" & Replace(tx_lastname.Text, "'", "''") & "%'"
Else
sqlwhere = " where lname like '" & Replace(tx_lastname.Text, "'", "''") & "%'"
End If
End If
If tx_firstname.Text <> "" Then
If (InStr(sqlwhere, "where")) Then
sqlwhere = sqlwhere & " AND fname like '" & Replace(tx_firstname.Text, "'", "''") & "%'"
Else
sqlwhere = " where fname like '" & Replace(tx_firstname.Text, "'", "''") & "%'"
End If
End If
dynamic_con = sqlwhere & " order by arr_date desc "
'create the temporary table on esosql.
CreateCommand = New SqlCommand("CREATE TABLE #TEMP_TABLE (".............", ESOConnection)
With CreateCommand
'Set the command type that you will run.
.CommandType = CommandType.Text
'Open the connection to betaserv.
ESOConnection.Open()
'Run the SQL statement.
.ExecuteNonQuery()
End With
'query our side
ESOCommand = New SqlCommand("SELECT * FROM [arrest_index]" & dynamic_con, ESOConnection)
'execute query
ESODataReader = ESOCommand.ExecuteReader()
'loop through recordset and populate temp table
While ESODataReader.Read()
MyInsert = New SqlCommand("INSERT INTO #TEMP_TABLE VALUES("......", ESOConnection)
'Set the command type that you will run.
MyInsert.CommandType = CommandType.Text
'Run the SQL statement.
MyInsert.ExecuteNonQuery()
End While
ESODataReader.Close() 'Create a DataAdapter, and then provide the name of the stored procedure.
MyDataAdapter = New SqlDataAdapter("TMPTABLE_QUERY", ESOConnection)
'Set the command type as StoredProcedure.
MyDataAdapter.SelectCommand.CommandType = CommandType.StoredProcedure
'Create a new DataSet to hold the records and fill it with the rows returned from stored procedure.
DS = New DataSet()
MyDataAdapter.Fill(DS, "arrindex")
'Assign the recordset to the gridview and bind it.
If DS.Tables(0).Rows.Count > 0 Then
GridView1.DataSource = DS
GridView1.DataBind()
End If
'Dispose of the DataAdapter
MyDataAdapter.Dispose()
'Close server connection
ESOConnection.Close() Again, a separate connection is open and closed.I've read you can only have 1 datareader available per connection. Isn't that what I have here? The error is returned on this line: MyInsert.ExecuteNonQuery()
Help is appreciated.
Hi
I am using a datareader to access data via a stored procedure. The reason for using the datareader is that the stored procedure is multi level depending on the variable sent to it. However I want to do two things with the data being returned.
The first is to poulate a datagrid - which I've done.
The second is to produce an Infragistic Web Graph. However according to the background reading I have done so far, I can only populate the graph from one of the following: datatable,dataview,dataset,Array or Ilist.
I don't want to make another call to the server for the same information, so how can I get the data out of a stored procedure into a dataset or dataview?
regards
Jim
Why won't this dataReader read?
Dim objCon2 As New SqlConnection()
objCon2.ConnectionString = "a standard connection string"
objCon2.Open()
Dim objCommand As SqlCommand
objCommand = New SqlCommand(strSQL, objCon2)
Dim objReader As SqlDataReader
objReader = objCommand.ExecuteReader()
Label1.Text = objReader("email")
strSQL is a select command which I've checked (using SQL Query analyzer) does return data. I know the connection string is valid (and I presume if it wasn't that it'd fail on objCon2.open, which it doesn't).
So why oh why do I get this error on the last line (and yes, there is an "email" field in the contents of the reader)
System.InvalidOperationException: Invalid attempt to read when no data is present.