Data Reader Or Data Adapter With Data Set?
Dec 4, 2007
I have used both data readers and data adapters(with datasets) in the projects that I have worked on. I am trying to get some clarification on when I should be using which one. I think I am doing this correctly but I want to be sure I am developing good habits.
As the name might suggest, it seems like a datareader is for only reading data. I have read that the data adapter and dataset are for a disconnected architecture. Or, that they can be used for this type of set up. I have been using the data adapter and datasets when writing to a database and the datareader when reading from a database.
Is this how these should be used? Is the data reader the best choice for reading data? Am I doing this the optimal way from a performance stand point?
......................................................thanks in advance
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Apr 16, 2008
I am a business user trying to build an incremental ETL package with SSIS. I have a working prototype on SQL Server 2005 where I select the max(ID) from the last successful run and pass that value into a variable. Then, in my Data Flow step, I select an OLE DB source adapter and use this variable in a custom select statement.
Here's my challenge....the live data is actually in a Postgres DB so I have to use a Data Reader Source adapter. When I try to pass my variable to this adapter the job bombs out. Does anyone know how to dynamically update the query text inside a Data Reader source adapter using variables or otherwise?
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Sep 9, 2015
I have a table that is returning rows from a table query. It seems I have done it before but I cannot seem to get the right procedure to obtain the values. I will paste in the code below in which you will see my bad attempts at accomplishing what I need.
Dim uid As String
Dim pw As String
Dim em As String, fn, ln, mi As String
Dim par As String
Dim Field, n, j As Integer
Dim JJ As Integer
[code]...
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Apr 2, 2008
I hope someone has seen this one...I've got a very simple web method that returns a DataTable from my database. It worked fine until I changed this line of code:
string SqlString = @"SELECT Timestamp, Confession FROM Confessions WHERE ConfessionID = ? ORDER BY Timestamp desc";
To this line of code:
string SqlString = @"SELECT Timestamp, Confession FROM Confessions WHERE ConfessionID = ? AND CategoryID = ? ORDER BY Timestamp desc";
Here is the complete webmethod:
[WebMethod]
public DataTable GetConfession (int ConfessionID, int CategoryID) {
DataTable dt = new DataTable();
dt.TableName = "XMLConfession";
string SqlString = @"SELECT Timestamp, Confession FROM Confessions WHERE ConfessionID = ? AND CategoryID = ? ORDER BY Timestamp desc";
using (OleDbConnection cn = new OleDbConnection (ConnectionString)) {
using (OleDbCommand cmd = new OleDbCommand (SqlString, cn)) {
cmd.CommandType = CommandType.Text;
cmd.Parameters.AddWithValue ("@ConfessionID", ConfessionID);
cmd.Parameters.AddWithValue ("@CategoryID", CategoryID);
cn.Open();
OleDbDataAdapter da = new OleDbDataAdapter (cmd);
da.Fill (dt);
}
}
return dt;
}
To cause the error, all I did was add the AND statement into the query. Now I get this .NET error message every time I try to run this program:
System.Web.Services.Protocols.SoapException: Server was unable to process request. ---> System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. at System.Data.Common.UnsafeNativeMethods.ICommandWithParameters.SetParameterInfo(IntPtr cParams, IntPtr[] rgParamOrdinals, tagDBPARAMBINDINFO[] rgParamBindInfo) at System.Data.OleDb.OleDbCommand.ApplyParameterBindings(ICommandWithParameters commandWithParameters, tagDBPARAMBINDINFO[] bindInfo) at System.Data.OleDb.OleDbCommand.CreateAccessor() at System.Data.OleDb.OleDbCommand.InitializeCommand(CommandBehavior behavior, Boolean throwifnotsupported) at System.Data.OleDb.OleDbCommand.ExecuteCommand(CommandBehavior behavior, Object& executeResult) at System.Data.OleDb.OleDbCommand.ExecuteReaderInternal(CommandBehavior behavior, String method) at System.Data.OleDb.OleDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.OleDb.OleDbCommand.System.Data.IDbCommand.ExecuteReader(CommandBehavior behavior) at System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior)
I am using SQL Server Compact Edition 3.5 and C# .NET 2.0. It's worth noting that the web service does this outside of the program as well, so I don't think the problem is in the code that calls it. Also worth noting is that the query itself works fine when I substitute values in and run it in .NET Server Explorer.
Thanks in advance for any assistance.
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Apr 11, 2007
I'm trying to figure this out
I have a store procedure that return the userId if a user exists in my table, return 0 otherwise
------------------------------------------------------------------------
Create Procedure spUpdatePasswordByUserId
@userName varchar(20),
@password varchar(20)
AS
Begin
Declare @userId int
Select @userId = (Select userId from userInfo Where userName = @userName and password = @password)
if (@userId > 0)
return @userId
else
return 0
------------------------------------------------------------------
I create a function called UpdatePasswordByUserId in my dataset with the above stored procedure that returns a scalar value. When I preview the data from the table adapter in my dataset, it spits out the right value.
But when I call this UpdatepasswordByUserId from an asp.net page, it returns null/blank/0
passport.UserInfoTableAdapters oUserInfo = new UserInfoTableAdapters();
Response.Write("userId: " + oUserInfo.UpdatePasswordByUserId(txtUserName.text, txtPassword.text) );
Do you guys have any idea why?
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Apr 16, 2008
Hi all, i got this error:
[DTS.Pipeline] Error: "component "Excel Source" (1)" failed validation and returned validation status "VS_NEEDSNEWMETADATA".
and also this:
[Excel Source [1]] Warning: The external metadata column collection is out of synchronization with the data source columns. The column "Fiscal Week" needs to be updated in the external metadata column collection. The column "Fiscal Year" needs to be updated in the external metadata column collection. The column "1st level" needs to be added to the external metadata column collection. The column "2nd level" needs to be added to the external metadata column collection. The column "3rd level" needs to be added to the external metadata column collection. The "external metadata column "1st Level" (16745)" needs to be removed from the external metadata column collection. The "external metadata column "3rd Level" (16609)" needs to be removed from the external metadata column collection. The "external metadata column "2nd Level" (16272)" needs to be removed from the external metadata column collection.
I tried going data flow->excel connection->advanced editor for excel source-> input and output properties and tried to refresh the columns affected.
It seems that somehow the 3 columns are not read in from the source file?
ans alslo fiscal year, fiscal week is not set up up properly in my data destination?
anyone faced such errors before?
Thanks
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Mar 18, 2007
A data reader is using a connection manager to connect to an ODBC System DSN . A query in the SqlCommand property is provided. Data is being truncated in the only string column . The data type in data reader output-->external columns shows as Unicode string [DT_WSTR] Length 7.
The truncated output in a text file is the first 3 characters from left to right . Changing the column order has no effect.
A linked server was created in SQL Server Management Studio to test the ODBC System DSN using the following:
EXEC sp_addlinkedserver
@server = 'server_name',
@srvproduct = '',
@provider = 'MSDASQL',
@datasrc = 'odbc_dsn_name'
Data returned using "OPENQUERY" does not truncate the string column indicating that the ODBC Driver returns data as expected with sql 2005, but not with the Data Reader.
Any assistance would be appreciated.
Thanks,
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May 3, 2007
Hi I have written a piece of code for Login form which reads the user id and password from db. It works fine with the Sql server 2000 but I get a error with Sql server 2005. SqlConnection conn = new SqlConnection("Data Source=D\SQLEXPRESS;Initial Catalog=model;Integrated Security=True"); SqlCommand cmd = new SqlCommand("Select * from JsLoginDetails", conn); conn.Open(); SqlDataReader dr = cmd.ExecuteReader(); while (dr.Read()) { if ((Login1.UserName == dr.GetValue(0).ToString()) && Login1.Password == dr.GetValue(1).ToString()) { Response.Redirect("MainJs.aspx"); } else { Login1.FailureText = "Invalid Userid Or Password"; } } dr.Dispose(); conn.Close(); } I get and error Invalid object name 'JsLoginDetails'. pls help thnksdiv
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Apr 22, 2008
I am having a very wierd issue regarding a DB2 sql query. I need to get data from Db2 and insert into our sql server database. Using data flow task, to get data I am using the data reader source. COnnection is ado.netodbc connection.
THis sql query also has some comments in it.
The first wierd thing is...
1. On Development server, when I run this query manually, meaning using toad, winsql (connection to the db2 database), the query runs fine. Brings back approx 667 rows which is correct. ON the same server when I try to run this query, via a SSIS pkg, data flow task, using data reader source, gives me error on those comments that exist in that query. But if I run the same SSIS pkg on another server (Integration server). It runs fine. The same pkg also runs fine if I run it from my machine. SO What is different on my Dev server compared to the Integration server.
2. Say if I take those comments out from the sql query, then try to run the ssis pkg. The query is stuck at the first record and goes in an infinite loop mode. though my query is not a procedure, it is just a sql statement. But this ssis pkg with the query runs absolutly fine on the other server. I aslo tried using the other types of connection and ole db source but still the same problem on the Dev server.
What do I need to look for that is so different on the dev server compare to the INT server. I also checked the version on both these server for Visual Studio 2005(by going to About Microsoft Visual Studio), it is the same.
This is what I have on both the servers....
Microsoft SQL Server Integration Services Designer
Version 9.00.3042.00
Please HELP !!!!
Thank you.
Jinita
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Jul 18, 2006
hi all,
i have a package in ssis that needs to deliver data from outside servers with odbc connection. i have desined the package with dataflow object that includes inside a datareader source. the data reader source connect via ado.net odbc connection to the ouside servers and makes a query like: select * from x where y=? and then i pass the data to my sql server. my question is like the following:
how do i config the datasource reader or the dataflow so it will recognize an input value to my above query? i.e for example:
select * from x where y=5 (5 is a global variable that i have inside the package). i did not see anywhere where can i do it.
please help,
tomer
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Feb 13, 2008
Hi,
I can populate a dataTable with type double (C#) of say '1055.01' however when I save these to the CE3.5 database using a float(CE3.5) I lose the decimal portion. The 'offending' code is:
this.court0TableAdapter1.Update(this.mycourtsDataSet1.Court0);
this.mycourtsDataSet1.AcceptChanges();
this.court0TableAdapter1.Fill(this.mycourtsDataSet1.Court0);
This did not happen with VS2005/CE3.01.
I have tried changing all references to decimal (or money in CE3.5) without luck.
I'm beginning to think that string may be the way to go!!!!!!!
Can someone shed some light on my problem.
Thanks,
Later:
It's necessary to update the datatable adapter as the 3.01 and 3.5 CE are not compatible.
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Feb 23, 2007
Ok, I know my connection string and config file are good. Once the rest of the code is added I receive this error:
"SQL Server does not exist or access denied. "
I'm using the 1.1 framework and my hosting company provides MSSql 2005.
Thanks for your time,
Charlie
Here's the code in my cond behind file.
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
namespace blog
{
/// <summary>
/// Summary description for WebForm1.
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Data.SqlClient.SqlConnection sqlConnect;
protected System.Web.UI.WebControls.DataList dList;
protected System.Data.SqlClient.SqlDataAdapter DA;
protected System.Data.SqlClient.SqlCommand sqlSelectCommand1;
protected System.Web.UI.WebControls.LinkButton linkAdmin;
protected System.Web.UI.WebControls.Image header;
protected blog.DS ds1;
private void Page_Load(object sender, System.EventArgs e)
{
DA.Fill(ds1, "blogEntry");
dList.DataBind();
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.sqlConnect = new System.Data.SqlClient.SqlConnection();
this.DA = new System.Data.SqlClient.SqlDataAdapter();
this.sqlSelectCommand1 = new System.Data.SqlClient.SqlCommand();
this.ds1 = new blog.DS();
((System.ComponentModel.ISupportInitialize)(this.ds1)).BeginInit();
this.linkAdmin.Click += new System.EventHandler(this.linkAdmin_Click);
//
// sqlConnection String
//////////////////webserver////////////////
this.sqlConnection1.ConnectionString = "Server=xxx.xxx.xxx.x;Database=myDataBase;User ID=myID;Password=myPass";
//////////////////local///////////////////
//this.sqlConnect.ConnectionString = "workstation id=HAL;packet size=4096;integrated security=SSPI;data source=HAL;pers" +
//"ist security info=False;initial catalog=blog";
//
// DA
//
this.DA.SelectCommand = this.sqlSelectCommand1;
this.DA.TableMappings.AddRange(new System.Data.Common.DataTableMapping[] {
new System.Data.Common.DataTableMapping("Table", "blogEntry", new System.Data.Common.DataColumnMapping[] {
new System.Data.Common.DataColumnMapping("bodyID", "bodyID"),
new System.Data.Common.DataColumnMapping("linkID", "linkID")})});
//
// sqlSelectCommand1
//
this.sqlSelectCommand1.CommandText = "SELECT id, wxID, dateID, titleID, bodyID, linkID FROM blogEntry ORDER BY id DESC";
this.sqlSelectCommand1.Connection = this.sqlConnect;
//
// ds1
//
this.ds1.DataSetName = "DS";
this.ds1.Locale = new System.Globalization.CultureInfo("en-US");
this.Load += new System.EventHandler(this.Page_Load);
((System.ComponentModel.ISupportInitialize)(this.ds1)).EndInit();
}
#endregion
private void linkAdmin_Click(object sender, System.EventArgs e)
{
Server.Transfer("logOn.aspx",true);
}
}
}
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Nov 24, 2006
Hi, all here,
Thank you very much for your kind attention.
I am wondering if it is possible to use SSIS to sample data set to training set and test set directly to my data mining models without saving them somewhere as occupying too much space? Really need guidance for that.
Thank you very much in advance for any help.
With best regards,
Yours sincerely,
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Sep 24, 2007
is it possible to use a data reader to read from 2 tables with 1 store procedure(sp)?
-------------------------------------------------
ex:
create sp1
as
select * from tbl1
select * from tbl2
-------------------------------------------------
how can i use a data reader to read the items from tbl2?
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Feb 22, 2008
Hi Guys,I have a quick question about DataReader, I have a function called "ExportTotal" i am calling this function from another function. what it does is it will put the Total for each Network in the Line 34. Right now what it is doing is It is putting the First Networktotal,2ndNetwork total,3rdNetwork total....... in the line 34. what i want is if the control comes to first network then it has to put only 1st network total and for the 2nd network only 2nd network total and so on. Please see my function below. Can you guys tell me what i am doing wrong?ThxPrivate Function exporttotal() As String Dim sql As String Dim dbFunctions As New DatabaseUtilities Dim tempinvoicetotal As String 'Dim rateactuals As String Dim filetext As String Dim tempclientname As String Dim strconn As String Dim prev_network As String = "" Dim current_network As String = "" strconn = CONNECTIONSTRING sql = "SELECT CAST(SUM(tblSpot.rateActual) AS int(4)) AS Rateactuals, SUM(tblSpot.rateActual * 0.85) AS netrate, SUM(tblSpot.rateActual * 0.15) AS commrate,TBLCLIENT.CLIENTNAME " & _"FROM tblSpot INNER JOIN tblContract ON tblSpot.fkContract = tblContract.pkid INNER JOIN " & _ " tblClient ON tblContract.fkClient = tblClient.pkid WHERE tblSpot.fkContractType = 'UNWIRED' AND " & _ "fkInvoiceNumber = '" & Me.txtinvoicenumber.Text & "' GROUP BY TBLCLIENT.CLIENTNAME" Dim myConn As New SqlConnection(CONNECTIONSTRING) Dim myCommand As New SqlCommand(sql, myConn) myConn.Open() Dim dbreader As SqlDataReader = myCommand.ExecuteReader() While dbreader.Read() Try Dim Rateactuals As String If dbreader("Rateactuals") Is DBNull.Value Then Rateactuals = "" Else Rateactuals = dbreader("Rateactuals") tempinvoicetotal = Rateactuals End If Dim clientname As String If dbreader("clientname") Is DBNull.Value Then clientname = "" Else clientname = dbreader("clientname") tempclientname = clientname End If If prev_network = "" Then filetext = filetext & vbCr & "34;;" & tempinvoicetotal & "00" & ";"Session("EDIExport4") = filetext prev_network = tempclientname Else current_network = tempclientname If prev_network <> current_network Then filetext = filetext & vbCr & "34;;" & tempinvoicetotal & "00" & ";"Session("EDIExport4") = filetext prev_network = tempclientname Else End If End If Catch SqlEx As SqlClient.SqlException Session("Error") = SqlEx.Message.ToString Response.Redirect("Error.aspx?Form=" & Request.Path) Catch Ex As System.Exception Session("Error") = Ex.Message.ToString Response.Redirect("Error.aspx?Form=" & Request.Path) End Try dbFunctions = Nothing End While myConn.Close() End Function
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Jun 11, 2007
Hi All,
I got an error while running this code.There is already an open DataReader associated with this Command which must be closed first
How can I resolve the error?
protected void Page_Load(object sender, EventArgs e) { string sql; SqlConnection Connection = new SqlConnection("ConnectionString"); sql = "SELECT PO_SE_Line_ID FROM PO_STOCK_QUERY_LINE_DETAILS WHERE TRANS_NUM ='TR-A-00-01-93'";
SqlCommand command = new SqlCommand(sql, Connection); SqlDataReader Dr; Connection.Open(); Dr = command.ExecuteReader(); while (Dr.Read()) {
sql = "SELECT SUPPLIER_ITEM_CODE,SUPPLIER_MAN_DESC,SUPPLIER_PAT_DESC,SUPPLIER_ITEM_DESC,SUPPLIER_ADDIT_DESC,SUPPLIER_SUGG_RETAIL FROM PO_STOCK_QUERY_LINE_DETAILS where TRANS_NUM ='TR-A-00-01-93' and PO_SE_Line_ID=" + Dr["PO_SE_Line_ID"].ToString();
SqlCommand command1 = new SqlCommand(sql, Connection);
SqlDataReader Dr1;
Dr1 = command1.ExecuteReader(); while(Dr1.Read()) {
Response.Write(Dr["SUPPLIER_ITEM_CODE"].ToString()); Response.Write("<br>"); Response.Write(Dr["SUPPLIER_MAN_DESC"].ToString()); Response.Write("<br>"); Response.Write(Dr["SUPPLIER_PAT_DESC"].ToString()); Response.Write("<br>"); Response.Write(Dr["SUPPLIER_ITEM_DESC"].ToString()); Response.Write("<br>"); Response.Write(Dr["SUPPLIER_ADDIT_DESC"].ToString());
}Dr1.Close();
}Dr.Close();
I tried to close the first data reader before opening the second data reader.still the error persists.
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Jun 26, 2007
Hi, i dont know whats gone wrong! but all of a sudden it seems to be throwing an error, i have looked at my previous code and it matches exactly when it was working, here is the code below int i = 0;for (i = 1; i <= 3; i++)
{
//This gets the stock ID from the textbox.string stock_ID = ((TextBox)Panel1.FindControl("txtID" + i.ToString())).Text;
//This is the sql statement.string sql = "SELECT [n_or_sh], [title], [cost_price], [selling_price] FROM tbl_stock WHERE stock_ID = " + stock_ID;
//This creates a sql command which executes the sql statement.SqlCommand sqlCmd = new SqlCommand(sql, myConn);
myConn.Open();
//This is a reader for the results to go in.SqlDataReader dr = sqlCmd.ExecuteReader();
//This reads the first result from the sqlReader
dr.Read();
//This sets the title label text to the value of the description column.TextBox currentBox1 = (TextBox)Panel1.FindControl("txtDesc" + i);
string strtxtDesc = currentBox1.Text;strtxtDesc = dr["title"].ToString();
};
myConn.Close();
i = 0;
the error its throwing is this
CS1519: Invalid token '(' in class, struct, or interface member declaration for the line myConn.Open()
does anybody have any idea how to solve this?
Jez
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Feb 11, 2008
Hi Guys,I have a quick question about DataReader, I have a function called "ExportTotal" i am calling this function from another function. what it does is it will put the Total for each Network in the Line 34. Right now what it is doing is It is putting the First Networktotal,2ndNetwork total,3rdNetwork total....... in the line 34. what i want is if the control comes to first network then it has to put only 1st network total and for the 2nd network only 2nd network total and so on. Please see my function below. Can you guys tell me what i am doing wrong?ThxPrivate Function exporttotal() As String Dim sql As String Dim dbFunctions As New DatabaseUtilities Dim tempinvoicetotal As String 'Dim rateactuals As String Dim filetext As String Dim tempclientname As String Dim strconn As String Dim prev_network As String = "" Dim current_network As String = "" strconn = CONNECTIONSTRING sql = "SELECT CAST(SUM(tblSpot.rateActual) AS int(4)) AS Rateactuals, SUM(tblSpot.rateActual * 0.85) AS netrate, SUM(tblSpot.rateActual * 0.15) AS commrate,TBLCLIENT.CLIENTNAME " & _"FROM tblSpot INNER JOIN tblContract ON tblSpot.fkContract = tblContract.pkid INNER JOIN " & _ " tblClient ON tblContract.fkClient = tblClient.pkid WHERE tblSpot.fkContractType = 'UNWIRED' AND " & _ "fkInvoiceNumber = '" & Me.txtinvoicenumber.Text & "' GROUP BY TBLCLIENT.CLIENTNAME" Dim myConn As New SqlConnection(CONNECTIONSTRING) Dim myCommand As New SqlCommand(sql, myConn) myConn.Open() Dim dbreader As SqlDataReader = myCommand.ExecuteReader() While dbreader.Read() Try Dim Rateactuals As String If dbreader("Rateactuals") Is DBNull.Value Then Rateactuals = "" Else Rateactuals = dbreader("Rateactuals") tempinvoicetotal = Rateactuals End If Dim clientname As String If dbreader("clientname") Is DBNull.Value Then clientname = "" Else clientname = dbreader("clientname") tempclientname = clientname End If If prev_network = "" Then filetext = filetext & vbCr & "34;;" & tempinvoicetotal & "00" & ";"Session("EDIExport4") = filetext prev_network = tempclientname Else current_network = tempclientname If prev_network <> current_network Then filetext = filetext & vbCr & "34;;" & tempinvoicetotal & "00" & ";"Session("EDIExport4") = filetext prev_network = tempclientname Else End If End If Catch SqlEx As SqlClient.SqlException Session("Error") = SqlEx.Message.ToString Response.Redirect("Error.aspx?Form=" & Request.Path) Catch Ex As System.Exception Session("Error") = Ex.Message.ToString Response.Redirect("Error.aspx?Form=" & Request.Path) End Try dbFunctions = Nothing End While myConn.Close() End Function
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Feb 29, 2008
I have an extremely simple (couldn't be simpler) WML query that I'm trying to use to populate a variable, and no matter what I try, I keep getting:
Error: 0xC002F304 at WMI Data Reader Task, WMI Data Reader Task: An error occurred with the following error message: "Invalid query ".
Here is exactly how I have the connection manager and task set up:
WMI Connection Manager:
ServerName = "\localhost"
Namespace = "
ootcimv2"
UseWindowsAuth = True
WMI Data Reader Task:
WmiConnection = WMI Connection Manager
WqlQuerySourceType = Direct input
WqlQuerySource = "SELECT Name FROM CIM_Datafile WHERE Name = 'C: est.txt'"
OutputType = Property value
OverwriteDestination = Overwrite destination
DestinationType = Variable
Destination = User::WmiVariable
I've tried setting the WmiVariable to both String and Object data types. I've tested the WMI connection (both within SSIS and through a sample VBS script), and that works just fine.
Any ideas?
Thanks in advance.
Jerad
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Jun 1, 2006
Hi,
Quick question on how SSIS handles queries from Data Source in a Data Flow. I noticed that when I run a particular query from Query Analyzer it takes forever. But, when I run the same query in SSIS data source in a data flow. The query results are immediate.
The query plan is already cached in SQL.
Is this just something which I am seeing incorrect or is there some bit of optimization in there in SSIS. As per my understanding SSIS does not optimize the source query.
Thanks,
Gaurav
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Apr 26, 2008
Hi ,
I have a situation where i need to read data from one table and and the result that i get i pass it thru a where clause in another query for which i need to read the database again. Problem iam phasing is with the Sqldatareader in a while loop . When iam trying to open a SqlDataReader with in a SqlDataReader iam getting an error that i need to close the data reader that i have already opened. Is there a way to solve this problem
Code:
public void fnIduction()
{
//Calculating the Deduction of Individual Employees
//Select from the EmployeeMast tableSqlCommand cmdEmp2 = new SqlCommand("select EmpCode,EmpName,DesigCode,DeptCode,BankCode,PFNo,PanNo,BankAcNo,GS,ESINo,PayrollGroup,LICNo,CategCode from EmployeeMast", cn);
cn.Open();SqlDataReader dr02;
dr02 = cmdEmp2.ExecuteReader();while (dr02.Read())
{strEmpCode = dr02["EmpCode"].ToString();
//Select from MondedPay,Deduction tables (Variable Deductions or Monthly Deductions)SqlCommand cmdDed02 = new SqlCommand("Select MondedPay.EmpCode,MondedPay.DedPayCode,Deduction.Name,MondedPay.DedPayMonth,MondedPay.DedPayYear,MondedPay.DedPayAmount from MondedPay,Deduction where Deduction.Code=MondedPay.DedPayCode and EmpCode='" + strEmpCode + "' and MondedPay.mType =1 ", cn);SqlDataReader drDed02;
drDed02 = cmdDed02.ExecuteReader();while (drDed02.Read())
{
strMonDedNam = drDed02["Name"].ToString();dobMonDedAmt = Convert.ToDouble(drDed02["DedPayAmount"].ToString());if (intDedPer == 1)
{
dobMonDedAmt = (dobDedAmt * dobBasic) / 100;
dobMonDedTot = dobMonDedTot + dobMonDedAmt;
}
else
{
dobMonDedTot = dobMonDedTot + dobMonDedAmt;
}
}
drDed02.Close();
}
dr02.Close();
cn.Close();
}
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Feb 28, 2007
Greetings SSIS friends,
I have tried using a sql command for my data reader source. I added the following expression to my datareader source :
"select * from result where result_id > " + @[max_result_id]
but I get the following error message :
The SQL command has not been set correctly. Check SQLCommand property.
I then got rid of the variable (defined at package level) and replaced it with a string like so :
"select * from result where result_id > " + "123456"
but I still get the same error message!
What am I doing wrong?!
Please advise.
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May 1, 2008
Can anyone provide an example or point me to an article that explains how to programmatically set the SQL command for a data reader. I am using a data flow task in a For Loop Container and want to change the SQL command for each loop based on the data from the previous.
Any help is greatly appreciated.
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Aug 31, 2007
Hi,
maybe you can help me with a little SSIS task. I want to fetch some wmi infos from serveral servers with the wmi reader. to read something is no problem, but whats the best way to bring them to a table or the control flow? Read from the generated file cant be a way. I also tried the variable. How do I get them to data flow. I tried a script task but i cant read the resultset. What format has the variable? ado.net, ado?
Whats the best way to get the results into a table?
regards
andreas
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Jan 31, 2006
Hi,
I am using a Ado Connection Manager to connect to a M S Access source.
But when I use this connection Manager in Data Reader Source, I am Not able to Configure Data reader Source. It gives exception "Cannot Acquire Managed Connection From Run Time Connection Manager".
Can anyone help on this.
Thanks
Dharmbir
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Oct 16, 2006
Hi guys,
I don't know why on earth. It only inform this: [WMI Data Reader Task] Error: An error occurred with the following error message: "Invalid query ".
My query is a simple one, very well-know for all of us:
strComputer = "SRVDESASQL2005"
Set wbemServices = GetObject("winmgmts:\" & strComputer)
Set wbemObjectSet = wbemServices.InstancesOf("Win32_LogicalMemoryConfiguration")
For Each wbemObject In wbemObjectSet
WScript.Echo "Total Physical Memory (kb): " & wbemObject.TotalPhysicalMemory
Next
Let me know any comment or thought, I'm just a beginner with WMI.
TIA.
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May 2, 2008
Hello everybody.
I recently started a short topic about staging an incremental load, and the answer was to use a variable. I've been fiddling around with it have run into a question about calling the variables.
I've gotten my "Execute SQL Task" to generate a single row result set and store it as a global / package Variable. Now I'm not sure how to call / use this variable when I'm loading data from an ADO.NET Data Reader Source.
Do I need to map the variable to a parameter first? Can I call the variable in the SELECT statement like this?
Code Snippet
SELECT *
FROM source
WHERE date > @variable
I was reading an MSDN page on Using Variables in Packages where they recommended the following syntax:
Code SnippetSELECT * from Production.Product WHERE ProductID = ?
But I'm not sure how to get the variable or parameter mapped to my Data Reader Source.
Any help would be greatly appreciated.
Thanks in advance,
- Trevor
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Feb 20, 2008
Hello,
I have a datareader and whenever the value that it is suppose to display in the Label is empty because there is no Data Entered Yet I gives me and error and I have the event set ONLOAD so the page with no data to disply does not load.
So the Ranking.text = a select statement i have, but when I dont have any data into the SQL database there is nothing to SELECT so the program gives of an error.
Can someone help me with this. Thank you.
Here is the code: Dim objReader As SqlDataReader
conn.Open()
objReader = comm.ExecuteReader()
objReader.Read()lblRanking.Text = objReader("Rating")
objReader.Close()
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Nov 16, 2006
HI,
I am query event log information for a single day using WMI Data reader task and it is taking for ever. I am querying event log for remote servers but the server exectuing the process and queried servers both are in the same domain.
Kindly advise.
Thanks
Shafiq
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Oct 6, 2006
I've created some store procedure for use with Insert. This works great. Now I'd like to be able to use Select statement so I can get the data in some textboxes.
Right now I use Select with SqlCommand and DataReader. This works fine, but I'd like to learn with Stored Procedure with this.
What do I put in the stored procedure to return found records and how what code should I use after executenonquery?
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May 30, 2007
Hello All,
How do I get columns to output when I have a data reader source? My connection is an ODBC and does complex sql. I am connection to a Netezza database and I would like to execute a very complex query, but in essence does
Create newtable as
(select day, sessionId)
from source
// lots of other joins and unions
select day, sessionId from newtable
drop newtable
I have an ODBC connection and I have a Datareader source, I cannot connect this source to my SQL Server destination because no output columns are available. What am I missing here?
Are there any good examples of this, taking data from a ODBC source into SQL server?
Thanks in advance.
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Feb 18, 2008
Hi I'm currently trying to create a few DTS packages that Import some very wide tables, Im using an ODBC data source into a Data Reader. I want to re-direct any errors into an error destination. The problem I've got is that I can go in and set each column to redirect but was hoping I could select or specify that this needs to happen for all the rows? Does anyone know if this is possible and if so how I go about it?
Many thanks....
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May 22, 2007
I am running a sql task which will pass table as object variable to the result set
I have a for each loop container which is used to loop for all the servers. I use two of the parameters to establish connection string in the for each loop task from the reasult set variables.
Now my next step is a data flow task (Data Reader Source) where i have to run a query but the table name and column names are dynamic and i dont see an option to call variables.
can someone tell me if this is possible (var1,var2,... are variables in the package scope)
select var1, var2 from var3.var4
where var5 = 'y'
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