generic ADO.NET classes?

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  - 1
    - Databinding problem Hello, I have problem that was described under the link below http://support.microsoft.com/default.aspx?scid=kb;EN-US;321504 I did follow the steps described in the artice with no success. Does anyone know a solution for the problem listed or should I just give up and follow a different method? Thank you for your help. Tag: generic ADO.NET classes? Tag: 92750
  - 2
    - How to use SQLBinary? I have a varbinary field in my table. (It has the potential of being rather large.) I need to read this value, change it and write it back. I have gotten as far as using the GetSQLBinary method of the SqlDataReader. What I don't know is what do I actually have at that point. I would assume that somewhere this information is going to be presented as an array of something or perhaps as a BitArray? How do I actually manipulate the contents of the varbinary column in my application code? Thanks ------------------------------------------- Roy Chastain KMSystems, Inc. Tag: generic ADO.NET classes? Tag: 92742
  - 3
    - Getting data in class hierarchy (C#) I have a class hierarchy that is, for simplicity sake, two levels deep. User -> MoreSpecificUser In most cases it will only be necessary for me to retrieve information for one or the other. I figure if I dont need all the data that the parrent has to offer why get it. So here was my solution, I have an interface that all classes must implement, this exposes Save, Load and Delete. If I want just the MoreSpecficUser data then I just call its Load() method. If I want the parent info I call base.Load(). Fine the coupling is low and maintenance is easy. Here's my only quibble. If I wanted to do this: public class User: IMyInterface { public void Load() { //open db connection //fill dataset //unpack dataset and fill load object members //close connection } } public class MoreSpecficUser : User { //other interface implementations here public override void Load() { base.Load(); //open db connection //fill dataset //unpack dataset and fill load object members //close connection } } As you acn see I've simply called the base Load method to get all the info available to this user. However it involves TWO database connections. Now this make life easy in terms of code maintenance and flexibility in the app but not sure how comfortable I am about makng two connections to fill and object. Tag: generic ADO.NET classes? Tag: 92737
  - 4
    - Update in DataGrid Hi everyone, how could i update in datagrid & then update in the database??? Thx & Regards begin 666 smiley_doh.gif M1TE&.#EA$ `0`.8``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```````````````````````````"'Y! 44`!\` M+ `````0`! ```?C@!^"@C%07EH\/6%2-(.")61X=&MO&1D#)E=+@SAW9A8" M!3LF"!D]`RU1'R5W2@$"!@HA/0]G`V\(4A]B9@"P"@P2.DI6/7$S4B5X$ 2Q M# X1&!PN1CYU9T=T! <+7]Y.3&!=4RQV1UEKW T4&ALU6"<I+#!R7EYM# T. M$Q@='O$O8-B04R9;@P@5^GD@D>*%C!L_S,7 @^)"OQ$D5CB\`80*GA(?T+@! MT0'C"B%$F@`I,H<-H3MC1LA[L64+ER%R[H 4U$E.$($Y@%3)B</1*C62Y,RQ 0@X?-3J.KCI3Q<B2&T4 `.P`` ` end Tag: generic ADO.NET classes? Tag: 92734
  - 5
    - how to use default value in sqlCommand In Sql Server, I can use syntax to insert a record with default value: insert table1(a,b,c)values('A','B',default) But in .Net, if I want to use default value in Adapter.InsertCommand,for example, SqlAdapObj.InsertCommand.Parameters.Add(New SqlClient.SqlParameter("@testField")) SqlAdapObj.InsertCommand.Parameters("@testField").Value=default There is no "default" in C# language, so it says error occurred,what const variable should I use to do so Tag: generic ADO.NET classes? Tag: 92733
  - 6
    - Please install MDAC error When I try to connect to an Access db, I get the following error: The .Net data OLE DB Provider(System.Data.OleDb) requires MDAC version 2.6 or later ... The code is: OleDbConnection JetCon; string sMyConnection = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + fnDB + ";Jet OLEDB:System Database="; JetCon = new OleDbConnection(sMyConnection); JetCon.Open(); I have msjet40.dll installed and the registry reports that I have MDAC v2.71.9030.4 installed. What have I missed? --- Posted using Wimdows.net NntpNews Component - Post Made from http://www.DotNetJunkies.com/newsgroups Our newsgroup engine supports Post Alerts, Ratings, and Searching. Tag: generic ADO.NET classes? Tag: 92732
  - 7
    - Trouble accessing db while using ASP.Net Group, I read Jeff Prosise's article: "An Introductory Guide to Building and Deploying More Secure Sites with ASP.NET and IIS, Part 2" as well as part 1. I think that articles are great. I had no problems running the example code in the first article, but I am having problems with the example as outlined in Figure 4. Specifically, I seem to be having troubles opening a connection to the database, and that's why I am posting to this group. When I try to open the connection ("connection.Open ();"), I am receiving this exception: "Exception Message: Login failed for user 'FormUser'. Reason: Not associated with a trusted SQL Server connection. Stack Trace: at System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction) at System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction) at System.Data.SqlClient.SqlConnection.Open() at ASP.LoginPage_aspx.CustomAuthenticate(String username, String password) Invalid login User name: jeff" [end of exception] The user "FormUser" was created by using this script: EXEC sp_addlogin 'FormUser', 'formuser', 'WebLogin' EXEC sp_grantlogin 'BILLDESKTOP\FormUser' EXEC sp_grantdbaccess 'BILLDESKTOP\FormUser', 'formuser' I have attached a copy of my LoginPage.aspx as well as the associated web.config file. Can you tell me what is going wrong here? I have tried to do research on this error, and as far as I can see, I have taken care of all of the isses. Also, if I turn impersonation on, I get the same error, but complaining about a differant user. I am using MSDE and Windows XP Pro. Also, I did send a similar EMail to the author, but I am sure that he gets a lot of bulk email from confused people like me, so I hope that one of you could help me. Thanks, Bill _________________________________________ login.aspx: <%@ Import NameSpace="System.Data.SqlClient" %> <html> <body> <h1>Please Log In</h1> <hr> <form runat="server"> <table cellpadding="8"> <tr> <td> User Name: </td> <td> <asp:TextBox ID="UserName" RunAt="server" /> </td> </tr> <tr> <td> Password: </td> <td> <asp:TextBox ID="Password" TextMode="password" RunAt="server" /> </td> </tr> <tr> <td> <asp:Button Text="Log In" OnClick="OnLogIn" RunAt="server" /> </td> <td> <asp:CheckBox Text="Keep me signed in" ID="Persistent" RunAt="server" /> </td> </tr> </table> </form> <hr> <h3><asp:Label ID="Output" RunAt="server" /></h3> </body> </html> <script language="C#" runat="server"> void OnLogIn (Object sender, EventArgs e) { if (CustomAuthenticate (UserName.Text, Password.Text)) FormsAuthentication.RedirectFromLoginPage (UserName.Text, Persistent.Checked); else Output.Text += "Invalid login" + "<br>" + "User name: " + UserName.Text; } bool CustomAuthenticate (string username, string password) { SqlConnection connection = new SqlConnection ("server=BILLDESKTOP\\JMSDEV1;database=weblogin;Integrated Security=SSPI;uid=FormUser;pwd=formuser"); try { connection.Open (); //this is where the excpetion is thrown StringBuilder builder = new StringBuilder (); builder.Append ("select count (*) from users " + "where username = \'"); builder.Append (username); builder.Append ("\' and cast (rtrim (password) as " + "varbinary) = cast (\'"); builder.Append (password); builder.Append ("\' as varbinary)"); SqlCommand command = new SqlCommand (builder.ToString (), connection); int count = (int) command.ExecuteScalar (); return (count > 0); } catch (SqlException se) {//this is where the exception is caught Output.Text += "Exception Message: " + se.Message + "<BR>"; Output.Text += "Stack Trace: " + se.StackTrace + "<BR>"; return false; } finally { connection.Close (); } } </script> ____________________________ web.config: <configuration> <system.web> <authentication mode="Forms"> <forms loginUrl="LoginPage.aspx" /> </authentication> </system.web> </configuration> Tag: generic ADO.NET classes? Tag: 92731
  - 8
    - How do I change the size of a boundcolumn when in edit mode? Hi, I want to change the size of my datagrid fields when I'm editing the record, how can I do this? Is there a property that I can use? Moe <asp:BoundColumn HeaderText="First Name" DataField="firstname" /> Tag: generic ADO.NET classes? Tag: 92728
  - 9
    - Use of radio buttons Hey fellows, I feel stupid asking this question because I'm sure the answer is so simple but it eludes me. In VB6 a standard practice was to but multiple radio buttons into a groupbox (called a frame) and assign each of the bottons a value. The frame then had the value of the button that was clicked and it's value could be bound to a data source. How the heck do you do that in VB7? There is a GroupBox control and a Panel control that will allow only one radio button to be the one selected but how does one bind that value into a database? I have an application involving persons and I want to have a GroupBox that has two option buttons on it, Male and Female and have the result be stored in as database as Male=0, Female = 1 in a bit column. Can anyone point me in the right direction as to how to do this simple thing? Many thanks. Spence Tag: generic ADO.NET classes? Tag: 92721
  - 10
    - memory leak when quering from SQL server Hi I have a query that gets binary info from the SQL Server. The problem is that the query is very large and the process that performs it consumes a lot of memory. Actually it consumes the amount of memory as defined in the SQL Server properties (memory tab). The problem is even bigger, because the process does not release the consumed memory and if I decrease it then i get a lot of page faults. Any help would be appreciated Uzi Tag: generic ADO.NET classes? Tag: 92719
  - 11
    - XSD From SQL Table Hi, What would be the shortest way to generate an XSD for a SQL table? Thanks, Alan Tag: generic ADO.NET classes? Tag: 92714
  - 12
    - SqlCommandBuilder unable to Update a dataset I am using SqlCommandBuilder to update,insert,delete my data. I can do for insert and delete. My code is string sql=" select * from "+dbname; SqlDataAdapter sdata=new SqlDataAdapter(); sdata.SelectCommand=new SqlCommand(sql,scon); SqlCommandBuilder scom=new SqlCommandBuilder(sdata); sdata.UpdateCommand=scom.GetUpdateCommand(); sdata.RowUpdating+=new SqlRowUpdatingEventHandler(sdata_RowUpdating); sdata.RowUpdated+=new SqlRowUpdatedEventHandler(sdata_RowUpdated); sdata.Update(ds,dbname); but when I reach the SqlRowUpdating Event my event argument command is undefined. But my dataadapter take the update command correctly. How can I solve this problem Thanks for all. Tag: generic ADO.NET classes? Tag: 92710
  - 13
    - HOWTO: NEWBIE: Query Data from Access Using ADO.NET? Hi There! How to query Access DB using ADO.NET and get Recordsets? e.g. I want the following sql... SELECT * FROM Authors query Access DB using ADO.NET and returned records will be displayed in a drop-down box in ASP.NET. Please help! Thanks in advance! Don Tag: generic ADO.NET classes? Tag: 92706
  - 14
    - Oracle connection string with IP address With SQL Server, I can create a connection string to a remote server using an IP address such as: "Data Source=190.190.200.100,1433;..." where 1433 is the port (1433 is the default) This works just fine. Is it possible to use the "Microsoft Managed Provider for Oracle" and connect via an IP address using something like the string below to connect to a remote Oracle 8i or 9i database server: "Data Source=190.190.200.100,1521;..." -- it is my understanding that 1521 or 1526 are the ports that are similar to 1433 If that is not the correct syntax, could you please identify how to do this. I have searched the web and discussion groups and can find nothing on connecting to a remote Oracle database server. Any help or advice would be much appreciated. Thanks. Ron _____________________________________ Ron Fluegge ronflueggeATswbellDOTnet Power corrupts, and absolute power is actually pretty neat... Tag: generic ADO.NET classes? Tag: 92705
  - 15
    - why can I set grid's DataSource to a DataSet but not to a table in the DataSet? I have a DataGrid on a WebForm. When I select that DataGrid and go to the "DataSource" property in the properties box, the drop-down lets me select dataSet11, which is the name of an object instance of class DataSet1, which VS.Net created for me derived from DataSet. However, DataSet1 has a schema with two tables in it -- if I right-click dataSet11 and pick "View Schema" it shows two tables, wbuser and BennettEmployee. Now, as soon as I set the DataSource property of my DataGrid to dataSet11, the layout of the DataGrid on the WebForm changes to display the columns "myusername", "mynickname", and "ID" -- these are the columns in the wbuser table from the DataSet1 schema. So, two questions: - Does this mean that "wbuser" is somehow the "default" table in the DataSet1 schema, so that if the DataSource is set to dataSet11, it automatically maps to the "wbuser" table of that DataSet, as opposed to the "BennettEmployee" table? Is there a way to change the default table to "BennettEmployee"? - More importantly, why does the DataSource dropdown in the IDE only let me set the DataSource to a *DataSet*, instead of a table within that DataSet? Since the data in the DataGrid is being pulled from a table, why won't it let me specify a table? Am I looking at this in some fundamentally wrong way? -Bennett Tag: generic ADO.NET classes? Tag: 92704
  - 16
    - Oracle connection string with IP address I can connect to a remote SQL Server database via an IP address by using a connection string such as: "Data Source=190.190.200.100,1433;..." where 1433 is the port to use (1433 is the default). If I use the Microsoft Managed Provider for Oracle, is it possible to connect to a remote Oracle database via an IP address by using a similar connection string such as: "Data Source=190.190.200.100,1521;..." where 1521 is the port? If I understand correctly, 1521 and 1526 are the Oracle listener counterparts to the 1433. If not, what is the proper connection string syntax to connect to a remote Oracle database? Thanks ... Tag: generic ADO.NET classes? Tag: 92703
  - 17
    - Oracle connection via an IP Address With SQL Server, you can enter an ADO.NET connection string using an IP address such as "Data Source=190.190.200.100,1433;...." to connect to a remote server. Can you do something similar with the Microsoft managed provider for Oracle such as "Data Source=190.190.200.100,1521;.." attaching to a remote Oracle database using either ports 1521 or 1526 similar to the 1433 for SQL Server? Tag: generic ADO.NET classes? Tag: 92702
  - 18
    - Switch to GUIDs - changing the way I code? When using Integer as PK, I would often have functions that would return the Integer when searching for a specific row in a datatable. I am trying to switch to GUID. Before, if the function returned a zero, I would assume the PK didn't exist. Now, if I make a call to lookup the GUID, and that row doesn't exist yet, I can't seem to figure out the simplest way - without doing a redundant function to check if exists first - causing two loops. Simple Example of my Integer based Code: Table1 - TableID(Int), Description(Nvarchar) Private Function GetTableIDByDescription(sDescription as String) as Integer Private iID as integer = 0 For each row If Description = sDescription Then iID = Row.TableID Return iID Private i as integer = GetTableIDByDescription(id) If i = 0 then ' New Record - insert Else ' Use the ID With GUID?: Table1 - TableID(GUID), Description(Nvarchar) Private Function GetTableIDByDescription(sDescription as String) as GUID Private iID as New Guid ' ?? For each row If Description = sDescription Then iID = Row.TableID Return iID Now, without two functions (one for Exists, one for GetID), is there a way that I can rewrite all these code sections? Masa Tag: generic ADO.NET classes? Tag: 92693
  - 19
    - Binding a datareader to a grid Is there a Winforms grid to which I can readily bind a datareader (purely for read-only visualisation of the datareader data and using the 1.1 framework)? Or is this in some way not regarded as a legitimate use for the datareader? JGD Tag: generic ADO.NET classes? Tag: 92683
  - 20
    - xml and csv with ado.net Hello everybody out there, I got a problem with a db-format, the metadata is written in XML (such things like tables names, paths, fieldnames and delimiter etc.), the data is written in .csv-files. How can I put this two thinmgs together in one dataset? Thanx Lars Tag: generic ADO.NET classes? Tag: 92677
  - 21
    - FillDataset only fills the first two tables. All, I have a typed dataset DS contains 4 tables (say TA, TB, TC,TD). I have one stored procedure contains 4 select (no relationship) SELECT * FROM TA SELECT * FROM TB SELECT * FROM TC SELECT * FROM TD I use MS Application block FillDataset as follow DS ds= new DS(); sp = "sp_SelectFour"; string[] tables = {"TA", "TB", "TC", "TD" }; SqlHelper.FillDataset(connString, CommandType.StoredProcedure, sp, ds, tables); but i only see TA and TB are filled with data. I checked sp using SQL Query Analyzer, it does return 4 result sets. To make sure I can get TC and TD filled: I change sp to only select TC and TD. and change tables = {"TC", "TD"}; I am able to fill TC and TB. So, Is there a limit that only two result sets can be fetched at a time? TIA. John Tag: generic ADO.NET classes? Tag: 92668
  - 22
    - Can't find primary key I have a dataset that I first do a FillSchema(dataset, SchemaType.Mapped, "Table") on, and yet it still throws System.Data.MissingPrimaryKeyException when I do a dataset.tables("Table").Rows.Find(key). The column is marked as a primary key in the table and the sql statement is just "SELECT * FROM tableName" Anybody have any idea why this can happen? P.S. Sorry if I didn't give enough info, but I am patching together someone else's mess, so I haven't gotten a chance to read it all yet. -Thanks Tag: generic ADO.NET classes? Tag: 92662
  - 23
    - How to merge two DataView objects Hi, I have two DataView objects sharing the same DataTable. I want to merge these two. Ideally the DataView class would have a Merge(DataView dv) method, but it doesn't. Does anyone know how to do this? Here is what Im trying to accomplish. Say I am using the Northwind database and I want to display 2 DataGrids, one representing the Customer table and one for OrderDetails table. Everytime I select a customer in the Customers table I would like to show all the order details in the Orders table for all the orders for that customer. So say the DataRowView representing the customer is customerDataRowView, then I will get all the children in the Orders table for that customer by ordersDataView = customerDataRowView.CreateChildView(CustomerToOrdersDataRelation); Then I want to say: orderDetailsDataView = new DataView(); foreach(DataRowView drv in ordersDataView.Rows) { DataView dv = drv.CreateChildView(OrdersToOrderDetailsDataRelation); orderDetailsDataView.Merge(dv); } Thanks in advance for all your help. Nima Tag: generic ADO.NET classes? Tag: 92661
  - 24
    - Inserting string into SQL Server image column I have a stored procedure in SQL Server that inserts a row into a table. One of the columns of the table has the "image" data type, which maps to a byte array in ADO SqlClient. The problem I have is that the data that I'm adding as a parameter when calling the stored procedure comes from a TextBox on the web page, which is of type string. As a result, I keep getting errors because it can't convert a string to a byte array. I cannot seem to find any kind of method that would do that for me. Does anyone know what would be the correct procedure to pass data for inserting into a column of type image, when the data is coming as a string from a text box? Or, if nothing else, how could I convert a string to a byte array? Thanks Tag: generic ADO.NET classes? Tag: 92660
  - 25
    - Problem with DatatableMapping I have a number of tables in my dataset and each is mapped as follows With mSQLDA .TableMappings.Add("tblClassificationResource", "tblClassificationResource") .TableMappings.Add("tblResourceProperty", "tblResourceProperty") End With but when i set the insert/update and delete commands for the dataadapter and run an update nothing happens, unless i clear the tablemapings and add a new one as follows mSQLDA.TableMappings.Clear() mSQLDA.TableMappings.Add("Table", "tblResourceProperty") then the update works Can someone please explain what i'm missing here? Thanks John Tag: generic ADO.NET classes? Tag: 92653
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  - 1
    - No error information available: DB_SEC_E_AUTH_FAILED(0x80040E4D)??? I have recieved this error message when trying to open a connection to an access database. What I don't understand is why earlier in the submit_click method the connection opened properly, yet in the loadTable method it throws the error "No error information available: DB_SEC_E_AUTH_FAILED(0x80040E4D)". I have included my code to help visualize what I am tryin to to. 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.OleDb; namespace dynamicAccess { /// <summary> /// Summary description for WebForm1. /// </summary> public class WebForm1 : System.Web.UI.Page { //declares the object that are in the web application protected System.Data.OleDb.OleDbCommand oleDbCommand1; protected System.Web.UI.WebControls.Button Submit; protected System.Data.OleDb.OleDbConnection myConnection; protected System.Web.UI.WebControls.Button LoadTable; protected System.Web.UI.WebControls.DropDownList DropDownList; protected System.Web.UI.HtmlControls.HtmlInputFile File1; protected System.Web.UI.WebControls.DataGrid DataGrid1; private void Page_Load(object sender, System.EventArgs e) { // Put user code to initialize the page here } #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.myConnection = new System.Data.OleDb.OleDbConnection(); this.oleDbCommand1 = new System.Data.OleDb.OleDbCommand(); this.Submit.Click += new System.EventHandler(this.Submit_Click); this.LoadTable.Click += new System.EventHandler(this.LoadTable_Click); // // myConnection // this.myConnection.ConnectionString = @"Jet OLEDB:Global Partial Bulk Ops=2;Jet OLEDB:Registry Path=;Jet OLEDB:Database Locking Mode=1;Mode=Share Deny None;Jet OLEDB:Engine Type=5;Provider=""Microsoft.Jet.OLEDB.4.0"";Jet OLEDB:System database=;Jet OLEDB:SFP=False;persist security info=False;Extended Properties=;Jet OLEDB:Compact Without Replica Repair=False;Jet OLEDB:Encrypt Database=False;Jet OLEDB:Create System Database=False;Jet OLEDB:Don't Copy Locale on Compact=False;User ID=Admin;Jet OLEDB:Global Bulk Transactions=1"; this.Load += new System.EventHandler(this.Page_Load); // // oleDbCommand1 // this.oleDbCommand1.CommandText = "SELECT * FROM"; this.oleDbCommand1.Connection = this.myConnection; } #endregion /* after the user finds the database they wish to open they must hit the submit button to * populate the dropdownlist. The Submit_Click populates the drop down list and updates * the command text.*/ private void Submit_Click(object sender, System.EventArgs e) { myConnection.ConnectionString += ";Data Source=" + File1.PostedFile.FileName; myConnection.Open(); DataTable schemaTable = myConnection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, new object[] {null,null,null,"TABLE"}); myConnection.Close(); DropDownList.DataSource=schemaTable; DropDownList.DataTextField = "TABLE_NAME"; DropDownList.DataValueField = "TABLE_NAME"; DropDownList.SelectedIndex = DropDownList.SelectedIndex; DropDownList.DataBind(); DropDownList.Items.Insert(0, new ListItem("Select a Table")); DropDownList.SelectedIndex = 0; oleDbCommand1.CommandText += " " + DropDownList.SelectedItem.Text; } /* This event fills the data grid so that the user can see the contents of the table selected. * At this time I am recieving an error when trying to open the connection. * (No error information available: DB_SEC_E_AUTH_FAILED(0x80040E4D))*/ private void LoadTable_Click(object sender, System.EventArgs e) { myConnection.Open(); System.Data.OleDb.OleDbDataReader Reader; Reader = oleDbCommand1.ExecuteReader(); DataGrid1.DataSource = Reader; DataGrid1.DataBind(); Reader.Close(); myConnection.Close(); } } } Tag: generic ADO.NET classes? Tag: 92646
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    - Help with SqlDataAdapter Update command (C#) This is a multi-part message in MIME format. ------=_NextPart_000_000A_01C470C1.0AB15790 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I am pulling my hair out over this one. I have done this same kind of = thing in VB.Net but in C# it doesn't work. I dont' receive any errors = either, it just won't update the pubs.Authors table. Here is the code: private void CodedDataGrid_Load(object sender, System.EventArgs e) { //create a new connection object String ConnectString =3D "Server=3D" + "MyMachine" + "; " + "User ID=3D" = + "sa" + "; Password=3D" + "password" + "; initial catalog =3D " + = "pubs" + ";"; conn =3D new SqlConnection(ConnectString); //create a new adapter adp =3D new SqlDataAdapter("Select au_id,au_lname,au_fname,contract FROM = authors",conn); //creat ea new dataset ds =3D new DataSet(); adp.Fill(ds); this.dbGrid.DataSource =3D ds; } private void btnNew_Click(object sender, System.EventArgs e) { AdapterInsert(); =20 //add a new record to the dataset, but first try { adp.Update(ds,"Table"); } catch (System.Data.SqlClient.SqlException sqlEx) { MessageBox.Show(sqlEx.Message); } catch(System.Exception ex) { MessageBox.Show(ex.Message); } } private void AdapterInsert() { insComm =3D new SqlCommand(); adp.InsertCommand =3D insComm; adp.InsertCommand.Connection =3D conn; adp.InsertCommand.CommandType =3D=20 CommandType.StoredProcedure; adp.InsertCommand.CommandText =3D "InsertAuthor"; SqlParameter MySqlParam1 =3D new = SqlParameter("@au_id",SqlDbType.VarChar); MySqlParam1.Value =3D this.txtID.Text; MySqlParam1.SourceColumn =3D "au_id"; adp.InsertCommand.Parameters.Add(MySqlParam1); SqlParameter MySqlParam2 =3D new = SqlParameter("@au_fname",SqlDbType.VarChar); MySqlParam2.Value =3D this.txtFName.Text; MySqlParam2.SourceColumn =3D "au_fname"; adp.InsertCommand.Parameters.Add(MySqlParam2); SqlParameter MySqlParam3 =3D new = SqlParameter("@au_lname",SqlDbType.VarChar); MySqlParam3.Value =3D this.txtLName.Text; MySqlParam3.SourceColumn =3D "au_lname"; adp.InsertCommand.Parameters.Add(MySqlParam3); SqlParameter MySqlParam4 =3D new = SqlParameter("@contract",SqlDbType.Bit); MySqlParam4.Value =3D "1"; MySqlParam4.SourceColumn =3D "contract"; adp.InsertCommand.Parameters.Add(MySqlParam4); } What the heck am I missing here? Thanks. =20 ------=_NextPart_000_000A_01C470C1.0AB15790 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2900.2162" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY> <DIV><FONT face=3DArial size=3D2>I am pulling my hair out over this one. = I have done=20 this same kind of thing in VB.Net but in C# it doesn't work. I dont' = receive any=20 errors either, it just won't update the pubs.Authors table. Here is the=20 code:</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>private void CodedDataGrid_Load(object = sender,=20 System.EventArgs e)<BR>  {<BR>  //create a new = connection=20 object<BR></FONT><FONT face=3DArial size=3D2>String ConnectString =3D = "Server=3D" +=20 "MyMachine" + "; " + </FONT><FONT face=3DArial size=3D2>"User ID=3D" + = "sa" + ";=20 Password=3D" + "password" + </FONT><FONT face=3DArial size=3D2>"; = initial catalog =3D "=20 + "pubs" + ";";<BR></FONT><FONT face=3DArial size=3D2>conn =3D new=20 SqlConnection(ConnectString);</FONT><FONT face=3DArial=20 size=3D2>   //create a new adapter<BR>adp =3D new=20 SqlDataAdapter("Select </FONT><FONT face=3DArial=20 size=3D2>au_id,au_lname,au_fname,contract FROM = authors",conn);<BR></FONT></DIV> <DIV><FONT face=3DArial size=3D2>   //creat ea new=20 dataset<BR>   ds =3D new=20 DataSet();<BR>   adp.Fill(ds);<BR>   this.d= bGrid.DataSource=20 =3D ds;</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>   }</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>  private void = btnNew_Click(object=20 sender, System.EventArgs=20 e)<BR>  {<BR>   AdapterInsert();</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial = size=3D2>   <BR>   //add a new=20 record to the dataset, but first</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial=20 size=3D2>   try<BR>   {<BR>  &nbs= p; adp.Update(ds,"Table");<BR>   }<BR>  &nb= sp;catch=20 (System.Data.SqlClient.SqlException=20 sqlEx)<BR>   {<BR>    MessageBox.Show(= sqlEx.Message);<BR>   }<BR>   catch(System.= Exception=20 ex)<BR>   {<BR>    MessageBox.Show(ex.= Message);<BR>   }</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>  }<BR>  private = void=20 AdapterInsert()<BR>  {<BR>   insComm =3D new=20 SqlCommand();<BR>   adp.InsertCommand =3D=20 insComm;<BR>   adp.InsertCommand.Connection =3D = conn;</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial = size=3D2>   adp.InsertCommand.CommandType =3D=20 </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial=20 size=3D2>CommandType.StoredProcedure;<BR>   adp.InsertComm= and.CommandText=20 =3D "InsertAuthor";</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>   SqlParameter = MySqlParam1 =3D new=20 </FONT><FONT face=3DArial=20 size=3D2>SqlParameter("@au_id",SqlDbType.VarChar);<BR>   M= ySqlParam1.Value=20 =3D this.txtID.Text;<BR>   MySqlParam1.SourceColumn =3D=20 "au_id";<BR>   adp.InsertCommand.Parameters.Add(MySqlParam= 1);</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>   SqlParameter = MySqlParam2 =3D new=20 </FONT><FONT face=3DArial=20 size=3D2>SqlParameter("@au_fname",SqlDbType.VarChar);<BR>  &nbs= p;MySqlParam2.Value=20 =3D this.txtFName.Text;<BR>   MySqlParam2.SourceColumn = =3D=20 "au_fname";<BR>   adp.InsertCommand.Parameters.Add(MySqlPa= ram2);</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>   SqlParameter = MySqlParam3 =3D new=20 </FONT><FONT face=3DArial=20 size=3D2>SqlParameter("@au_lname",SqlDbType.VarChar);<BR>  &nbs= p;MySqlParam3.Value=20 =3D this.txtLName.Text;<BR>   MySqlParam3.SourceColumn = =3D=20 "au_lname";<BR>   adp.InsertCommand.Parameters.Add(MySqlPa= ram3);</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>   SqlParameter = MySqlParam4 =3D new=20 </FONT><FONT face=3DArial=20 size=3D2>SqlParameter("@contract",SqlDbType.Bit);<BR>   My= SqlParam4.Value=20 =3D "1";<BR>   MySqlParam4.SourceColumn =3D=20 "contract";<BR>   adp.InsertCommand.Parameters.Add(MySqlPa= ram4);</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>}<BR></FONT></DIV> <DIV><FONT face=3DArial size=3D2>What the heck am I missing = here?</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Thanks.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2> </DIV></FONT> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>  </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV></BODY></HTML> ------=_NextPart_000_000A_01C470C1.0AB15790-- Tag: generic ADO.NET classes? Tag: 92645
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    - can u set a SQL table constraint from within VS.NET? Hi I have an table on an SQL server and need to set a constraint like do not allow an insertion of a record of the first field (a varchar) matches any of the existing records. Just wondering if this can be done from within .NET? I think it can be done from the enterprise manager tool but not sure. Thanks. -- Paul G Software engineer. Tag: generic ADO.NET classes? Tag: 92642
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    - Data adapter UPDATE command not working I'm trying to either modify or insert new records in a database with the code listed below. I tried adding the RowUpdating and RowUpdated events and put breakpoints there, but it never gets there. I'm not sure why. I've checked the dataset and it gets modified after the LoadDataRow command executes. Any help would be appreciated. Thanks, John --------------- code snippet from the btnSave_Click event ------------- object[] objRow = new object[7]; if (mode != "NewRecord") {objRow[0] = lblOrganizationID.Text;} objRow[1] = txtOrganization.Text; objRow[2] = txtAbbreviation.Text; objRow[3] = cboParent.SelectedValue; objRow[4] = cboHierarchy.SelectedValue; objRow[5] = cboSector.SelectedValue; objRow[6] = cboIndustry.SelectedValue; DataRow rowUpdate; dsOrganizations1.Tables["Organizations"].BeginLoadData(); rowUpdate = dsOrganizations1.Tables["Organizations"].LoadDataRow(objRow,true); dsOrganizations1.Tables["Organizations"].EndLoadData(); this.daOrganizations.Update(dsOrganizations1,"Organizations"); Tag: generic ADO.NET classes? Tag: 92635
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    - ERROR: ORA-00162: external dbid length 17 is greater than maximum (16) QUESTION: I am receiving this error when I open a connection " ORA-00162: external dbid length 17 is greater than maximum (16) " What is wrong? ANSWER: If you are using System.OracleClient.dll version 1.0.5000.0, you can modify your TNSNAMES.ORA and make alias shorter. TNSNAMES.ora is in oralcle/network/admin directory. For example: tnsnames.ora file has... short122.world = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST = 133.231.113.280) (PORT = 1521) ) (CONNECT_DATA = (SID = ORAQ38) ) ) NOTE: If you are using the System.OracleClient.dll version 1.0.3300.0, you don't get this problem. EXAMPLE: In .NET Winforms, populate the datagrid upon button1 click. private void button1_Click(object sender, System.EventArgs e) { Cursor.Current = Cursors.WaitCursor; OracleConnection objOraConn = new OracleConnection("user id=yourid;data source=\"short122.world\";password=password"); objOraConn.Open(); string commandString = " SELECT * FROM A_MYTABLE" ; OracleCommand cmd = objOraConn.CreateCommand(); cmd.CommandText = commandString; cmd.Prepare(); OracleDataAdapter da = new OracleDataAdapter(cmd); DataSet ds = new DataSet(); da.Fill(ds); objOraConn.Close(); // Execute the statement dataGrid1.DataSource = ds.Tables[0].DefaultView; Cursor.Current = Cursors.Default; } Tag: generic ADO.NET classes? Tag: 92634
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    - Can't get value from DataSet without explicity type casting? Hey guys, got a question! I've got a DataSet/DataTable, created by using a DataAdapter.Fill call. I'm writing a C# class that handles all the ADO.NET work I need, and a different class will call the public methods of this class. So; I've created the two public fields I need- Public String _custId and Public DateTime _orderDate. But, I can't get the values out of the DataSet/DataTable/DataColumn without doing (in my mind) useless casting! For instance, this doesn't work: _custID = dsOrders.Tables["tblOrd"].Rows[iCurrentRow][0]; I get the message "Cannot implicitly convert type 'object' to 'string' ". To make it work, I have to do: _custID = (String)dsOrders.Tables["tblOrd"].Rows[iCurrentRow][0]; ....or.... _custID = dsOrders.Tables["tblOrd"].Rows[iCurrentRow][0].ToString(); I'm confused as to why? The following line displays "System.String": Console.WriteLine(dsOrders.Tables["tblOrd"].Rows[iCurrentRow].Table.Columns[ 0].DataType); So, shouldn't that mean that I don't have to do anything else? Why do I need to use (String) or .ToString() ? And I also can't get the DateTime into a variable. Trying _orderDate = dsHousing.Tables["tblOrd"].Rows[iCurrentRow][1]; gives me "Cannot implicitly convert type 'object' to 'System.DateTime' ". And, again, if I display the value for Columns[1].DataType, it shows me "System.DateTime". Worse, there's no ".ToDateTime()" method of the Column object, so the only way I can get the DateTime field out is to cast it to a string, and then convert it back to a DateTime. Compared to my problem with the String column, I'm doing twice the un-necessary work just to get the DateTime column! Is this really what's supposed to happen? If the DataType shows string, why do I need to perform an explicit conversion from object to string? It seems like I'm doing un-necessary work; if the value is stored as a certain datatype, I should be able to pull it out of the DataTable and put it into a variable of the same type. I even toyed with the idea of .NET assuming I wanted the DataColumn being put into a String- but I can't find a property of DataColumn that just gives me the value. In classic ADO, there was a Field object, which had a Value property. I can understand "DataColumn" being an object, but is there a specific property for pulling the value out of DataColumn? For instance, if those code samples I just gave would be in classic ADO, I would be trying to say _CustID = rs.Fields(x).Value. Oh I'm using VS 2003.NET EA, with WinXP, .NET 1.1, and have "Using System.Data" and "Using System.Data.OracleClient" at the top of my C# class definition. At first I thought this might be Oracle related, but DataSet/DataTable/DataColumn is part of the System.Data namespace. Thanks! -Thomas Tag: generic ADO.NET classes? Tag: 92627
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    - Creating a DataRelation Hi, Creating a DataRelation among two tables seems to be pretty simple (according to ADO.NET Core Reference). However, I'm not sure of the best time to create it. Is it better to create the DataRelation between the tables after the tables have been filled, or is it better to create ForeignKeyConstraints when creating the columns of each table? Roshawn Tag: generic ADO.NET classes? Tag: 92621
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    - Re: Microsoft Data Access Block for .NET and the "like" statement I am a little confused by your response. In your example you show a select based on the CustomerID, in this case "ALFKI." I don't see how this would produce a 'like' statement. In this case there is only one customer in Northwind..Customers whose id is like 'ALFKI%'. To use a specific example from the Customer table I would like to create a query similar to: select * from Northwind..Customers where ContactName like 'Maria%' Paul =?Utf-8?B?RGF2dWQgQnJuY2g=?= wrote: > Yes here is a sample: > System.Data.SqlClient.SqlParameter[] parms = new System.Data.SqlClient.SqlParameter [1]; > DataSet ds; > parms[0] = new SqlParameter( "@CustomerID","ALFKI"); > ds = SqlHelper.ExecuteDataset(ConnectionString,CommandType.Text,"Select * >From Customers where CustomerID= @CustomerID",parms); > return ds; > > David > > > > "Paul Wolpe" wrote: > > > Is there a way to use a like statement with a SqlParameter and the > > Microsoft Data Access Block? > > > > I would like to be able to do this: > > > > int CustomerID = (int) SqlHelper.ExecuteScalar( > > ConfigurationSettings.AppSettings["connectionString"], > > CommandType.Text, > > @"select CustomerId > > from Northwind..Customers > > where ContactName like '%@customer_name%'", > > new SqlParameter("@customer_name",CustomerName) > > ); > > > > Since the DAB already quotes my SqlParameter, SqlServer ends up seeing > > extra quote signs. Something like: > > > > where ContactName like '%'John Doe'%' > > > > Any thoughts? > > > > -Paul > > > > Microsoft Data Access Block: > > http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html/daab-rm.asp > > Tag: generic ADO.NET classes? Tag: 92618
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    - Issues with connecting from .NET to Sybase ASE 12 If anyone out there has been successful in connecting to Sybase ASE 12 from Visual Studio .NET 2003 either in a Windows Forms or Reporting Services project, can you please help me. .... In summary, I wish to: (a) create a Windows Forms application using VB.NET (Visual Studio .NET 2003 and .NET Framework 1.1) that will connect to Sybase ASE 12.0 to execute stored procedures. (b) create a SQL Server Reporting Services report using Visual Studio .NET 2003, .NET Framework 1.1 and SQL Server Reporting Services that will connect to Sybase ASE 12.0 also via stored procedures. I have Sybase 12 Client installed on my development machine and am able to connect to a test server from this machine using SQL Advantage. My code for (a) is: >>>>> Dim sybaseconn As System.Data.OleDb.OleDbConnection Dim sybaseconnstring As String = "Provider=Sybase.ASEOLEDBProvider;Server Name=XXXXXX;Initial Catalog=YYYYYY;User ID=UUUUUU;Password=PPPPPP;" Try sybaseconn = New System.Data.OleDb.OleDbConnection(sybaseconnstring) sybaseconn.Open() Catch ex As Exception MsgBox(ex.Message) Finally Select Case sybaseconn.State Case ConnectionState.Broken, ConnectionState.Closed Case Else sybaseconn.Close() sybaseconn.Dispose() End Select sybaseconn = Nothing End Try >>>>> When I run this, I receive the following message on the Open() line: "The 'Sybase.ASEOLEDBProvider' provider is not registered on the local machine." and this is the exception: ?ex {System.InvalidOperationException} [System.InvalidOperationException]: {System.InvalidOperationException} HelpLink: Nothing InnerException: {System.Data.OleDb.OleDbException} Message: "The 'Sybase.ASEOLEDBProvider' provider is not registered on the local machine." Source: "System.Data" StackTrace: " at System.Data.OleDb.OleDbConnection.CreateProviderError(Int32 hr) at System.Data.OleDb.OleDbConnection.CreateProvider(OleDbConnectionString constr) at System.Data.OleDb.OleDbConnection.Open() at Sybase_Stuff.Form1.Button1_Click(Object sender, EventArgs e) in C:\Documents and Settings\allchini\My Documents\Visual Studio Projects\Sybase Stuff\Form1.vb:line 98" TargetSite: {System.Reflection.RuntimeMethodInfo} My problem with (b) is as follows: In my Reporting Services project in Visual Studio .NET 2003 I attempt to set up a shared data source by selecting Add New Datasource. This displays the Data Link Properties dialog. On the Provider tab, I select "Sybase ASE OLE DB Provider". When I press Next or OK, I receive the following message: Microsoft Data Link Error Provider is no longer available. Ensure that the provider is installed properly. Can you tell me how to achieve (a) and/ or (b)? Thanks Ian Allchin Tag: generic ADO.NET classes? Tag: 92615
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    - testing try/catch when filling a data adapter Hello. This may be a dumb question, but it's driving me crazy. The function is supposed to to fill a datatable. It works just fine, but I'm testing to make sure my error handling works so I changed the name of the stored procedure so I know I will get an error. However, for some reason, my try/catch does not catch the error. Instead, the program seems to stop. Does this make sense? Do you have any ideas why this happens? Thank you! Protected sub Run(ByVal sprocName As String, ByVal parameters() As SqlParameter, ByRef dataTable As DataTable) Dim command As SqlCommand command = CreateCommand(sprocName, parameters) Dim dataAdapter As SqlDataAdapter dataTable = New DataTable dataAdapter = New SqlDataAdapter dataAdapter.SelectCommand = command dataAdapter.Fill(dataTable) End Function Tag: generic ADO.NET classes? Tag: 92611
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    - cSharp ADO.NET sample .. plz.. Hi.. I am new to Csharp.. I would like to get some source for SELECT , UPDATE , DELETE , INSERT samples .. I need it states from Declaration of Connection Object to displaying selected Records... Is there anyone to help me?. Plz let me get out of .NET hell.. TIA Tag: generic ADO.NET classes? Tag: 92608
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    - dev connections work, test does not VB .net 2002 crystal reports 9 .net framework 1.1 All connections worked on my box. Having compiled the application and run the .exe on a test box, I find all three db connections now fail. The MS documentation advised to include "Imports Microsoft.Data.Odbc" but that was not an option in my environment, so I tried "Imports Microsoft.VisualBasic.OpenAccess" in my vb file. It didn't work. My connections to the 3 dbs are: 1. An odbc system connection using the format ... Dim crDatabase As Database Dim item As String Dim crTables As Tables Dim crTable As Table Dim crTableLogOnInfo As TableLogOnInfo Dim crConnectionInfo As ConnectionInfo Dim subrpt As New ReportDocument() With crConnectionInfo .DatabaseName = "" .Password = "xx" .ServerName = "xxx" .UserID = "xx" End With 2. Dim m_cnADONetConnection As New OleDb.OleDbConnection() m_cnADONetConnection.ConnectionString = "Provider=Microsoft.Jet.Oledb.4.0;Data Source=YYYYYYY\yy\ABC.mdb" 3. Dim m_cnADONetConnection2 As New OleDb.OleDbConnection() m_cnADONetConnection2.ConnectionString = "Provider=Microsoft.Jet.Oledb.4.0;DataSource=BBBBBBBBBBB\bbbbbbbbbb\CC.mdb;" Please help! What do I need to do now to make this work? Much appreciated, -Helen Tag: generic ADO.NET classes? Tag: 92607
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    - Odd error messages Hi When I open some asp.net pages (VB code behind) in VS2003 I am getting the errors below. Funnily enough the project will compile and run. I am just curious as to what they are and how to fix them. Note the errors refer to the page's class (the code behind page): * The DataTableMappingCollection only accepts non-null DataTableMapping type objects. Parameter name: value * Exception has been thrown by the target of an invocation. The other thing is if I try and open the tablemappings property of a data adapter, I get the following messagebox: "Unable to retrieve the schema from the database table. Source column mapping information will not be available. Would you like to continue? Any pointers? Note I am running VS2003, DNF 1.1, SQL Server 2000. Thanks Alex Tag: generic ADO.NET classes? Tag: 92606
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    - multiple instances of named argument has anyone ever experienced this when calling a stored procedure from oracle? when i open up the form and type in my variable to be used in the stored procedure, IT WORKS JUST FINE ONCE. but, to, say, change the variable and look for something else causes this and the only recourse is to close the program - re-open it and make another call. since the arguments come from the client side, i hardly think its an oracle problem and in the stored procedure, i do close the cursor. is there a step im missing? thanks this forum is great rik ********************************************************************** Sent via Fuzzy Software @ http://www.fuzzysoftware.com/ Comprehensive, categorised, searchable collection of links to ASP & ASP.NET resources... Tag: generic ADO.NET classes? Tag: 92601
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    - DataSet/DataTable to Excel Hi, Is there any similiar way to transfer data from DataSet/DataTable to Excel Worksheet providing there is not need to copy each row/column cell individually from DataTable/DataSet into individual cells on excel worksheet. Ideally ADO function CopyFromRecordset would be suitable but my data is in the DataSet/DataTable in .NET app. Thank you, Nataliya Tag: generic ADO.NET classes? Tag: 92598
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    - Access timeout? Is there something in the connection string that will timeout a MS Access connection if left open? The ldb doesn't ever seem to disappear, even no one is using the file. Thanks! Tag: generic ADO.NET classes? Tag: 92596
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    - Insertion of a nodelist using DataSet.WriteXml method. I have created an XML file using DataSet object, in my application. My Dataset consists of 2 tables. I want to insert a set of nodes in the second table. Which means I want to make the child rows of the table 2 of my dataset. The table will be 2 only , but the second table should have a new rowset in the last column. For this if I use WriteXml object, the insertion is at the last, means the insertion being done after the second table. it makes another table. So, i am not able to solve it properly. Actually , how to write the code to create update the XML document by inserting the node set, by using DataSetName.WriteXml method. Tag: generic ADO.NET classes? Tag: 92593
  - 18
    - Optimistic concurrency Hi group. Hope there are some gurus out there that can help me understand this topic. I am about to design a rather large department solution in .NET, utilizing ADO.NET, ASP.NET and XML WebServices. How do ADO.NET handle optimistic concurrency? From what I have read it is built in. But only if you use the CommandBuilder or construct your UPDATE stament/prodcedure so, that every column is checked against, right? I am having trouble finding out on what level the concurrency check is done. This is the "architecture" I plan to use: WebForm->DataBound component->DataSet->DataAdapter->DataSource I understand that if I only use one table, the CommandBuilder can be used to build select, update, delete and insert statements of the DataAdapter. On update all colums are checking against in the WHERE clause, to check if some of them have changed since the DataSet was filled by the DataAdapter. In this scenario it seems like the concurrency is handled at the database level. When not using the CommandBuilder, do I have to provide a "similar mecanism" myself, when writing the code for select, update, delete and insert statements? Sorry for the rather long post...But I hope someone has just a bit of the answers to my quesions.. Thanx in advance Best regards Henrik Tag: generic ADO.NET classes? Tag: 92591
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    - "Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done." I'm trying to do a INSERT in a table with this code: protected int RunProcedure(string storedProcName, IDataParameter[] parameters, out int rowsAffected){ int result=0; rowsAffected = 0; try{ Connection.Open(); OleDbCommand command = BuildIntCommand(storedProcName,parameters); rowsAffected = command.ExecuteNonQuery(); result = (int)command.Parameters["ReturnValue"].Value; Connection.Close(); } catch(OleDbException e){... } private OleDbCommand BuildIntCommand(string storedProcName, IDataParameter[] parameters) { OleDbCommand command = BuildQueryCommand(storedProcName,parameters); command.Parameters.Add(new OleDbParameter("ReturnValue", OleDbType.Numeric, 4, ParameterDirection.ReturnValue, false, 0, 0, string.Empty, DataRowVersion.Default, null)); return command; } private OleDbCommand BuildQueryCommand(string storedProcName, IDataParameter[] parameters) { OleDbCommand command = new OleDbCommand(storedProcName, Connection); command.CommandType = CommandType.StoredProcedure; foreach(OleDbParameter parameter in parameters) { command.Parameters.Add(parameter); } return command; } My DataBase is Access 2000 and the called store is: PARAMETERS [@ID_INTERVENTO] Long; INSERT INTO TABLE_NAME(FIELD1) VALUES ([@PARAM1]); On command.ExecuteNonQuery() i have always this error: "Multiple-step OLE DB operation generated errors. Check each OLE DB status value, if available. No work was done." Have you got any solutions?? thanks Tag: generic ADO.NET classes? Tag: 92587
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    - Access MSysRelationship Hi How to get access to Access database table MSysRelationship. Thanks Konrad Tag: generic ADO.NET classes? Tag: 92581
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    - Oracle update command and timestamp - how to get it back? To all you Oracle gurus out there, I'm updating an Oracle table with an OleDbDataAdapter (win forms). I'm using a timestamp column rather than comparing all the values to determine concurrency violation. The way I set the timestamp column is within the actual dataAdapter update/insert statement. SYS_TIMESTAMP = SYSDATE ..... equivalent of Now() in SQL I believe? Screenshot of update query builder: http://www.insightgis.com.au/web/stuff/update_qry_builder.gif This works fine, when an update is posted to the db it will write the current SYSDATE to the timestamp column. However, the currently displayed record on my form doesn't know about the new timestamp value, therefore if you make a subsequent edit to that same record and try to post changes to the db you get a concurrency violation error. Question is, when the dataAdapter makes the update to the db, can it refresh the local copy of the timestamp with the new value? Or do I have to fish out the whole record from the db again? One of my tables has 160 fields, so I'd rather not have to fish the whole record out again for obvious reasons :-) How do you Oracle people get around this problem? Cheers, PeterZ Tag: generic ADO.NET classes? Tag: 92579
  - 22
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  - 23
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  - 24
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  - 25
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Is there any discussion on the availability of generic classes for ADO.NET
classes to create strongly typed versions? We were able to create typed
datasets easily but it was not easy to create a typed datatable "that could
give a typed DataView" since DataView is what is mostly used for
databinding.

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Re: generic ADO.NET classes? by Miha

Miha
Mon Jul 26 12:28:15 CDT 2004

Hi Sankar,

Hm, there is no big need for typed dataviews IMO.
You might access the DataRow directly through DataView.Row property and cast
it to strong typed row.

--
Miha Markic [MVP C#] - RightHand .NET consulting & development
miha at rthand com
www.rthand.com

"Sankar Nemani" <snemani@nospamlumedx.com> wrote in message
news:OzfzMLzcEHA.2140@TK2MSFTNGP09.phx.gbl...
> Is there any discussion on the availability of generic classes for ADO.NET
> classes to create strongly typed versions? We were able to create typed
> datasets easily but it was not easy to create a typed datatable "that
could
> give a typed DataView" since DataView is what is mostly used for
> databinding.
>
>

Top

Re: generic ADO.NET classes? by Sankar

Sankar
Mon Jul 26 13:03:51 CDT 2004

But are there any "generic" classes for the common ADO.NET classes for
instance a datatable

"Miha Markic [MVP C#]" <miha at rthand com> wrote in message
news:evutwXzcEHA.1248@TK2MSFTNGP11.phx.gbl...
> Hi Sankar,
>
> Hm, there is no big need for typed dataviews IMO.
> You might access the DataRow directly through DataView.Row property and
cast
> it to strong typed row.
>
> --
> Miha Markic [MVP C#] - RightHand .NET consulting & development
> miha at rthand com
> www.rthand.com
>
> "Sankar Nemani" <snemani@nospamlumedx.com> wrote in message
> news:OzfzMLzcEHA.2140@TK2MSFTNGP09.phx.gbl...
> > Is there any discussion on the availability of generic classes for
ADO.NET
> > classes to create strongly typed versions? We were able to create typed
> > datasets easily but it was not easy to create a typed datatable "that
> could
> > give a typed DataView" since DataView is what is mostly used for
> > databinding.
> >
> >
>
>

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Re: generic ADO.NET classes? by v-kevy

v-kevy
Mon Jul 26 23:06:44 CDT 2004

Hi Sankar,

First of all, I would like to confirm my understanding of your issue. From
your description, I understand that you need to find some generic classes
for common ADO.NET classes for instance a datatable. If there is any
misunderstanding, please feel free to let me know.

As far as I know, there isn't such classes that create typed DataTable or
typed DataViews. Just as Miha mentioned, there is no need for typed
dataviews. You might access the DataRow directly through DataView.Row
property and cast it to strong typed row.

Kevin Yu
=======
"This posting is provided "AS IS" with no warranties, and confers no
rights."

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