I have the following SQL statement in the DataReader.SQLCommand.
select * from myTable where DataEdited > 'some hard coded date data'
I want to read the above 'some hard coded date data' from a table sitting in different database which is not the same server where the DataReader is connected.
How to do that?
I can populate the 'some hard coded date data' to a SSIS variable but do not know how to embed that in the SQL statement.
HiI'm trying to loop through all the records in a recordset and perform a database update within the loop. The problem is that you can't have more than one datareader open at the same time. How should I be doing this? cmdPhoto = New SqlCommand("select AuthorityID,AuthorityName,PREF From qryStaffSearch where AuthorityType='User' Order by AuthorityName", conWhitt)conWhitt.Open()dtrPhoto = cmdPhoto.ExecuteReaderWhile dtrPhoto.Read()If Not File.Exists("D:WhittNetLiveWebimagesstaffphotospat_images_resize" & dtrPhoto("PRef") & ".jpg") ThencmdUpdate = New SqlCommand("Update tblAuthority Set NoPhoto = 1 Where AuthorityID =" & dtrPhoto("AuthorityID"), conWhitt)cmdUpdate.ExecuteNonQuery()End IfEnd WhileThanks
I have gathered from reading online that I need to create a 2nd connection to SQL Server if I want to insert records into the database while in a "while (reader.Read())" loop.
I am trying to make my code as generic as possible, and I don't want to have to re-input the connection string at this point in my code. Is there a way to generate a new connection based on the existing open one? Or should I just create 2 connections up front and carry them around with me like I do for the 1 connection now?
I have a multiple form project for a Windows CE 5.0 device (Symbol MC3000) written in VB.NET (Visual Studio 2005) using SQL Server Compact 3.5.
If I create the database on the SD Card, the program works fine until the unit is "suspended". When the power resumes, I can still continue to work and save/access data in the database as long as I do not go to another form. If I go to another form, I get an access violation error (0xC0000005).
If the database is installed in main memory the prorgam works properly even after the power is cycled.
Unfortunately, due to the memory size restrictions on the device, there are cases where the database needs to be stored on the SD Card.
Currently the program uses a single "global" SQLCeConnection and the connection is closed prior to the device being powered off. However, each procedure/event in the program uses it's own SQLCeCommand and SQLCeDataReader objects (which are created and closed/disposed prior to the end of the procedure).
I have tried everything I can think of, including OS updates, .NET Compact Framework 2.0 updates and modifications to the program to correct this, but the results are the same.
Would creating a global SQLDataReader and SQLCeCommand object help with this issue or should the way that this is currently being handled work?
This is my code:1 If Session("ctr") = False Then 2 3 Connect() 4 5 SQL = "SELECT * FROM counter" 6 SQL = SQL & " WHERE ipaddress='" & Request.ServerVariables("REMOTE_ADDR") & "'" 7 dbRead() 8 9 If dbReader.HasRows = True Then 10 11 dbReader.Read() 12 hits = dbReader("hits") 13 hits = hits + 1 14 dbClose() 15 16 SQL = "UPDATE counter SET hits=" & hits 17 SQL = SQL & " WHERE ipaddress='" & Request.ServerVariables("REMOTE_ADDR") & "'" 18 dbExecute() 19 20 Else 21 22 SQL = "INSERT INTO counter(ipaddress,hits)" 23 SQL = SQL & " VALUES('" & Request.ServerVariables("REMOTE_ADDR") & "',1)" 24 dbExecute() 25 26 End If 27 28 Session("ctr") = True 29 30 End If 1 Public Sub Connect() 2 Conn = New SqlConnection("Initial Catalog=NURSETEST;User Id=sa;Password=sa;Data Source=KSNCRUZ") 3 If Conn.State = ConnectionState.Open Then 4 Conn.Close() 5 End If 6 Conn.Open() 7 End Sub 8 9 Public Sub Close() 10 Conn.Close() 11 Conn = Nothing 12 End Sub 13 14 Public Sub dbExecute() 15 dbCommand = New SqlCommand(SQL, Conn) 16 dbCommand.ExecuteNonQuery() 17 End Sub 18 19 Public Sub dbRead() 20 dbCommand = New SqlCommand(SQL, Conn) 21 dbReader = dbCommand.ExecuteReader 22 End Sub 23 24 Public Sub dbClose() 25 SQL = "" 26 dbReader.Close() 27 End Sub
the class code: Dataase.cs: using System; using System.Data; using System.Configuration; using System.Linq; 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.Xml.Linq; using System.Data.SqlClient; using System.Data.Common; using System.Web; /// <summary> /// Summary description for DataBase /// </summary> public class DataBase { private SqlConnection con=new SqlConnection(); private void Open() { if (con==null) { con = new SqlConnection("Data Source=58.17.30.81;Initial Catalog=a1230192748;Persist Security Info=True;User ID=a1230192748;Password=***"); } if (con.State == System.Data.ConnectionState.Closed) { con.ConnectionString = "Data Source=58.17.30.81;Initial Catalog=a1230192748;Persist Security Info=True;User ID=a1230192748;Password=****"; con.Open(); } } public void Close() { if (con != null && con.State != System.Data.ConnectionState.Open) con.Close(); } public DataBase() { // // TODO: Add constructor logic here // } public string liuyan(string id,string sign) { string com=string.Empty; switch(sign) { case "xiaobiaoti": com="Select subject from liuyan where liuyanid='"+id+"'"; break; case "def_message": com="Select message from liuyan where liuyanid='"+id+"'"; break; } SqlCommand myCommand=new SqlCommand(com,con); Open(); try { SqlDataReader sdr=myCommand.ExecuteReader(); if (sdr.Read()) { return sdr[0].ToString(); } else { return ""; } sdr.Close(); //what i have written.} catch (Exception ex) { HttpContext.Current.Response.Write("<script>alert('error:" + ex.Message + "')</script>"); return ""; } finally { myCommand.Dispose(); Close(); } } }
it was instantiated once in aspx.cs code.I invoke liuyan(string id,string sign) twice.The first one is OK and the second one makes an exception.
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?
i am using visual web developer 2005 and SQL 2005 with VB as the code behindi am using INSERT command like this Dim test As New SqlDataSource() test.ConnectionString = ConfigurationManager.ConnectionStrings("DatabaseConnectionString1").ToString() test.InsertCommandType = SqlDataSourceCommandType.Text test.InsertCommand = "INSERT INTO try (roll,name, age, email) VALUES (@roll,@name, @age, @email) " test.InsertParameters.Add("roll", TextBox1.Text) test.InsertParameters.Add("name", TextBox2.Text) test.InsertParameters.Add("age", TextBox3.Text) test.InsertParameters.Add("email", TextBox4.Text) test.Insert() i am using UPDATE command like this Dim test As New SqlDataSource() test.ConnectionString = ConfigurationManager.ConnectionStrings("DatabaseConnectionString").ToString() test.UpdateCommandType = SqlDataSourceCommandType.Text test.UpdateCommand = "UPDATE try SET name = '" + myname + "' , age = '" + myage + "' , email = '" + myemail + "' WHERE roll 123 " test.Update()but i have to use the SELECT command like this which is completely different from INSERT and UPDATE commands Dim tblData As New Data.DataTable() Dim conn As New Data.SqlClient.SqlConnection("Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|Database.mdf;Integrated Security=True;User Instance=True") Dim Command As New Data.SqlClient.SqlCommand("SELECT * FROM try WHERE age = '100' ", conn) Dim da As New Data.SqlClient.SqlDataAdapter(Command) da.Fill(tblData) conn.Close() TextBox4.Text = tblData.Rows(1).Item("name").ToString() TextBox5.Text = tblData.Rows(1).Item("age").ToString() TextBox6.Text = tblData.Rows(1).Item("email").ToString() for INSERT and UPDATE commands defining the command,commandtype and connectionstring is samebut for the SELECT command it is completely different. why ?can i define the command,commandtype and connectionstring for SELECT command similar to INSERT and UPDATE ?if its possible how to do ?please help me
i am using a OLE DB Source in my dataflow component and want to select rows from the source based on the Name I enter during execution time. I have created two variables,
enterName - String packageLevel (will store the name I enter)
myVar - String packageLevel. (to store the query)
I am assigning this query to the myVar variable, "Select * from db.Users where (UsrName = " + @[User::enterName] + " )"
Now in the OLE Db source, I have selected as Sql Command from Variable, and I am getting the variable, enterName,. I select that and when I click on OK am getting this error.
Error at Data Flow Task [OLE DB Source [1]]: An OLE DB error has occurred. Error code: 0x80040E0C. An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80040E0C Description: "Command text was not set for the command object.".
Can Someone guide me whr am going wrong?
myVar variable, i have set the ExecuteAsExpression Property to true too.
Hi. I am writing a program in C# to migrate data from a Foxpro database to an SQL Server 2005 Express database. The package is being created programmatically. I am creating a separate data flow for each Foxpro table. It seems to be doing it ok but I am getting the following error message at the package validation stage:
Description: An OLE DB Error has occured. Error code: 0x80040E0C.
An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80040E0C Description: "Command text was not set for the command object".
.........
Description: "component "OLE DB Destination" (22)" failed validation and returned validation status "VS_ISBROKEN".
This is the first time I am writing such code and I there must be something I am not doing correct but can't seem to figure it out. Any help will be highly appreciated. My code is as below:
private bool BuildPackage()
{
// Create the package object
oPackage = new Package();
// Create connections for the Foxpro and SQL Server data
MessageBox.Show("The DTS package was not built successfully because of the following error(s):" + sErrorMessage, "Package Builder", MessageBoxButtons.OK, MessageBoxIcon.Information);
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();
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....
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 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
hi 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);
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)
'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.
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?
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.
I have data I am retrieving using a datareader...and SQLSERVER It could return 1 row of information or perhaps 3 rows of information I need to know how to use an array here I would guess so I can access each element in this row or rows.
HOw might I use reader.read and get it into the array
I want to create a DataList that shows products, which will be on multiple pages. I have my stored proc to show paged results, which contains a return value for more records. I have found examples of coding the DataReader, defining all the parameters etc, but what about the drag and drop SqlDataSource?? You can select the DataSource Mode to be "DataReader". I can put select parameters in, with input and my return value. I don't know how to then access the return value, or output value if needed, from this? My DataList references the SqlDataSource, but I don't know how to get the return/output value out??? This is very frustrating, cause I can't find any info about it anywhere. Always input parameters, but no output. This is my current SqlDataSource...
If I take out the RETURN_VALUE Parameter, my results display in my data list, but that's useless if I can't access the return value to determine the remaining number of pages etc. Is my RETURN_VALUE parameter wrong? How do I access that? My stored proc is shown below...
CREATE PROCEDURE sp_PagedItems ( @Page int, @RecsPerPage int, @CategoryID int ) AS
-- We don't want to return the # of rows inserted -- into our temporary table, so turn NOCOUNT ON SET NOCOUNT ON
--Create a temporary table CREATE TABLE #TempItems ( ID int IDENTITY, No varchar(100), Name varchar(100), SDescription varchar(500), Size varchar(10), ImageURL varchar(100) )
-- Insert the rows from tblItems into the temp. table INSERT INTO #TempItems (No, Name, SDescription, Size, ImageURL) SELECT No, Name, SDescription, Size, ImageURL FROM Products WHERE CategoryID=@CategoryID
-- Find out the first and last record we want DECLARE @FirstRec int, @LastRec int SELECT @FirstRec = (@Page - 1) * @RecsPerPage SELECT @LastRec = (@Page * @RecsPerPage + 1)
-- Now, return the set of paged records, plus, an indiciation of we -- have more records or not! SELECT *, MoreRecords = ( SELECT COUNT(*) FROM #TempItems TI WHERE TI.ID >= @LastRec ) FROM #TempItems WHERE ID > @FirstRec AND ID < @LastRec
I am very disappinted where Datareader have no RecordCount where I can get the total records it read. I guess I found a way:
sql = "SELECT *, ROW_NUMBER() OVER (ORDER BY id DESC) AS c FROM ACCOUNTS ORDER BY c DESC"Dim command As SqlCommand = New SqlCommand(sql, New SqlConnection(_DBConnectionString)) command.Connection.Open() _ReturnDataReader = command.ExecuteReader(CommandBehavior.CloseConnection) command.Dispose() _TotalRecord = _ReturnDataReader.GetInt64(_ReturnDataReader.GetOrdinal("c")) Have SQL Server 2005 count for me....
As a beginner, I'm attempting to set up security for SQL Server But it's not working and am fairly confused at the moment.
The current problem is to do with getting SQL Security logins to work. I've added a login for a 'reader' user (no updates allowed) and have set the database user to use only the 'db_datareader' role. Yet, when I logon as that user, I can update data without a problem.
The system is a standalone PC using XP Pro with SQL Express installed.
The connection string is valid (and works, allowing access to all data) and is of the type: "server=xxxxx;database=xxxx;Trusted_Connection=True;"
The application is written is VB.NET
I hope I'm making some simple mistake here and I'd really appreciate any thoughts ...
Hi All, I am the following problem retrieving Float data from a Compact SQL database, it worked perfectly with 1.1 .Net CF, but since updating to 2.0 .Net CF its crashing with a "InvalidCastException" Error, have checked the DB its a Float...
I am using a DataReader to read an ODBC Data Source.
Some of my dates are not valid. I would like to have the DataReader just treat the bad dates as Null. However I cannot seem to find a setting that will get me past the DataReader.
In SQL 2000 DTS I was able to use a script to skip the bad dates.
Please help because I don't want to have to run SQL 2000 DTS on SQL 2005.
the following is the code,....When i run this code I get "Invalid operation exception", Trying to read when no data is present, but the query returns result in query analyser...can anyone suggest what the problem is ... Connection is open and the query is simple select statement
SqlCommand myCommand = new SqlCommand(query,myConnection); myConnection.Open();
i have 2 database queries. One fetches data from a table and other according to first query result second query fetches record from another table both of these queries make use of datareader and while loop for inserting data to dropdownlist , but instead of that i want to add all my row fetched by second query store one by one in a dataset for some time .in simple words i want to insert datareader record one by one in dataset. i am using asp.net2.0,c#, Sql server 2000
hi, i have this code it gets the records from db i need to add the results of the datareader to a label but label control does not have a datasource property second problem is how to comma separate the results.with array? or what please help i need to show the results like this: record1,record2,record3Dim Conn As New SqlConnection(ConfigurationManager.ConnectionStrings("Conn").ConnectionString) Dim strSQL As StringDim dr As SqlDataReader Dim userID As Integer = Session("cmmLogonUserID") strSQL = "select id,extension from musicExt"Dim cmd As New SqlCommand()cmd = New SqlCommand(strSQL, Conn) Conn.Open() dr = cmd.ExecuteReader()
'txtMediaFormats.Text = dr ??????? ' ddlGenres.DataBind() ???????? Conn.Close()
