VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library)

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  - 1
    - Question on SqlDataReader.Close Hi all, According the MSDN documentation on the SqlDataReader.Close method, it says that: The Close method fills in the values for output parameters, return values and RecordsAffected, increasing the amount of time it takes to close a SqlDataReader.... Is that mean before I can retrieve the value of stored procedure output parameters, I should call the SqlDataReader.Close method? But in some sample code I found on the web, it reads the output parameters before calling the Close method? Which is more appropriate? Thanks for help! Best Regards, Tony Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109774
  - 2
    - Lightweight Dataset I am planning to design a lightweight dataset, any links or any pointers will be helpful. Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109772
  - 3
    - Version of Excel in Connection String Hello: I am using the following connection string in my program Code: XLFileConn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & filename & _ ";Extended Properties=""Excel 8.0;HDR=YES;IMEX=1""" Is there any other versions of Excel i can put in this connection string instead of Excel 8.0. Can I put excel 9.0 or 10.0. Is it possible to put an earlier version like 5.0 (is there an excel 5.0?). I guess i want to know what are my options are for that value. Thank You Prasun Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109770
  - 4
    - bindingnavigator save button I installed the VS.NET 2005 Beta 2. I used a bindingnavigator on a form. Set its datasource property do a bindingsource. But, navigator does not show a Save button. Add new and delete buttons are there but there is no save button.. what is the problem.? thanks... Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109769
  - 5
    - Detect change in DataBase Hello everybody, In my apps I use MSDE and I want detect all chanege in one table (most inportant is INSERT). This table is very long (over 50000 records). I want very fast refresh data in my DataSet. Thx Pawel Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109761
  - 6
    - Req: Need suggestions for search algorithm Hi I'm working on a site which requires the users to specify a hotel at which they're staying in London. The complete list of hotels comes to something like 1600 records. Each record consists of Hotel Name, Street Address and Postcode. We need to make it as simple as possible for users to pick their hotel, but I don't want to put 1600 hotel names in a drop-down list, and we have to consider the fact that not every user is going to know the full name and address of their hotel. Furthermore, we have to assume that misspellings will be common and also the shortening of address elements. For example, "Road" could be entered as "Rd", "Rd." or "Road" "Street" could be "St", "St." or "Street" "Lane" could be "Ln", "Lne" or "Lane" etc Taking all these scenarios and requirements into hand can anyone suggest a fool-proof yet easy to use mechanism for providing this sort of search capability on a web-page? I'm using ADO.NET to interface to Sql Server 2000 db. Would Full-text indexing on this table be of any use? I'm intersted to know how people would go about this themselves. Thanks Ben Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109758
  - 7
    - Power raising in a datacolumn expression Hello, Does anybody know how to use power raising in a datacolumn expression ?? Example: NewColumn = FirstColumn ^ 1.2345 or NewColumn = Power (FirstColumn,1.2345) -- Thanks in advance Jos Beelen Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109757
  - 8
    - DataGrid with Master-Detail DataSet I have a DataSet with two tables which are in a master-detail relationship. How do I show a detail table in datagrid and some columns from a master table. (Ex.: Orders and a customer name for every order comes from a Customers table). Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109749
  - 9
    - Problems with XML, XSD, Web, Services & InfoPath Hi all, Have been playing about with web services but unable to achieve what I am wanting and in attempts finding strange problems. I have created a web service for retrieving customer data and for updating the data using datasets. I have created a XML schema. I decided to use InfoPath for testing things out. Works great for getting the data. The data table on SQL Server 2000 allows nulls. If I was to change this I would have to split my customers into 2 tables. The table allows customer details to be stored as an individual or organisation. As a result some fields don't require any values so I have allowed nulls. When I come to update the data on InfoPath I can't edit the fields that contain nulls and the update fails because InfoPath only sends fields in the XML that do not contain null values. My thought of the way round this was to set minOccurs and maxOccurs to 1, I have also marked the elements with default values and set nill to true. When I test the web service method on the server minOccurs is set at 0 but the XML schema shows as 1. The Schema file is publicly available and this shows correct. Any ideas folks? Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109747
  - 10
    - Date Format Problem - SQL Server Insert From Web Application Hi, I've written a short aspx file so that end users can insert lines into our SQL server database. The following string is sent by Internet Explorer to the database where it updates the relevant table - INSERT INTO Tbl_Manual([Data Date],[Staff ID], Flag1, Flag2, Flag3, Ref1, Ref2, Timestamp, Inputter) values('15/05/2005', '89', '1', '0', '0', '77', '8', '01/05/2005 08:54:10', 'HOME\username') The 2nd date is sent as a string into an nvarchar field so it causes no problems but the first (which is heading for a datetime field) is assumed by SQL to be MM/dd/yyyy format no matter what I try to do. All regional settings are set to UK English & the table in SQL correctly uses dd/MM/yyyy format so the above insert command fails thinking that I'm trying to add a date of the 5th of month 15. If I try input a date as mm/dd/yyyy format into the aspx page, an error is thrown back. Any ideas as to what's going wrong ? Thanks Steve Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109738
  - 11
    - Advice on "converting" one DataTable to a different structure? Hi everyone-- I have a one-row DataTable that I need to manipulate. It consists of a series of three columns of related information. All the columns are strings. For example-- Col1 Col1Descrip Col1Value Col2 Col2Description Col3Value <etc> "AUTHOR" "email author" "John" "CC" "the copyee" "Rebecca" What I'd like to do is "pivot" the table, so to speak, so that it only has three columns; one for the field name, the field description, and the value. The single row I have now would be broken into separate rows of three columns each. Again, here's an example of what I'd like see in the end: NewCol NewColDescrip NewColValue "AUTHOR" "email author" "John" "CC" "the copyee" "Rebecca" Is there an optimal way of doing this? I suppose I could create a new DataTable with three columns, then walk through the original DataRow and build a new row every three columns along....it just sounds a little kludgey. I don't know, but I thought I'd ask if there were another, better way to do it. Thanks for the advice. Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109728
  - 12
    - Double lock on iseries db2 ado.net transaction I'm seeing some odd locking behavior when using an DB2400 database and running an ado.net transaction. My code -- in simplified form, appears at the bottom. I want to run several INSERT statements using the same iDB2Connection and iDB2Command. Then I want to Commit() so that either all the data goes in, or not. What happens though is this: 1. After the first INSERT, a lock appears on the FILE 2. After the second INSERT, another lock appears on the FILE. 3. I can then add several more records, and no more locks appears 4. After the Commit(), one lock disappears but not the other. I have run the code with every available IsolationLevel, including the default, and the result is the same. My questions are: 1. Where could this second lock come from? 2. Why does Commit() not remove it? 3. What additional properties or commands do I need to account for to remove this lock? 4. I have read that there may be a journaling property that sets up an 'autocommit/rollback' in the event of a system crash -- could this be what's causing it? using System; using IBM.Data.DB2.iSeries; using System.Data; using System.Diagnostics; namespace simpleTtest { /// <summary> /// Summary description for Class1. /// </summary> class Class1 { /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main(string[] args) { // // TODO: Add code to start application here string connStr= "Data Source=192.168.NNN.NNN;User Id=XXXXXX;Password=XXXXX;Default Collection=DataLibrary;"; iDB2Connection p_iconn = new iDB2Connection(connStr); iDB2Transaction itrans=null; iDB2Command icmd=new iDB2Command("INSERT INTO " + "$MANINV.PEM610WD"+ "(" + "W1BATCH)" + "VALUES('100')", p_iconn); p_iconn.Open(); itrans = p_iconn.BeginTransaction( IsolationLevel.RepeatableRead ); icmd.Transaction=itrans; try { icmd.ExecuteNonQuery(); //after this statement a lock is generated icmd.ExecuteNonQuery(); //after this statement a second lock appears icmd.ExecuteNonQuery(); //no more locks; there are still two(2) at this point itrans.Commit(); // after commit, one lock is removed -- one remains! why...? } catch(Exception e) { Debug.WriteLine(e.ToString()); itrans.Rollback(); } finally { p_iconn.Close(); } } } } -- Texeme Construct http://texeme.com Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109727
  - 13
    - Re: Using ms access how do I set column that can be of zero length TIA Sorry , I should have made it clear, how do I do it in code. Thanks. Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109725
  - 14
    - Importing existing data Hi vs2005 beta2. I have created a sql server data file from within vs. Is there any way to import existing access tables & data into the sql server datafile? I have tried installed sql server 2004 developer from msdn but did not see any enterprise manager type tools that come with sql server 2000. What am I missing? Thanks Regards Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109723
  - 15
    - IDataReader Read() method question Hello All! I am going to crazy and feeling myself so stupid but I don't understand such behavior. I have code: public int getNextAgentId() { Int32 agent_id = 0; IDataReader dr = dbap.DBDataReader("SELECT MAX(agent_id) FROM Agents"); if(dr.Read()) { agent_id = dr.GetInt32(0); } dr.Close(); return agent_id + 1; } where dbap is an instance of DB abstraction class, hence using IDataReader interface instead of concrete DB DataReader such as SqlDataReader. SELECT returns null due to database table is empty and I have error message "Data is Null. This method or property cannot be called on Null values." on line agent_id = dr.GetInt32(0); As I understand in the beginning datareader positioned before first record and when I call Read method it should point to first record but why it returns true in conditions when now rows returned from DB? Any ideas? Thanks in advance to all. Below my code of abstraction class (dbap is instance of DBAbstractionProcessor class): public class DBAbstractionProcessor { // implemented DB provider types public enum DbType { SQLServer, OLEDb, ODBC }; private DbType dbtype; private AbstractDBFactory dbf; public DBAbstractionProcessor(DbType db_type) { this.dbtype = db_type; } private void selectDbType() { switch(this.dbtype) { case DbType.SQLServer: this.dbf = new SQLServerDb(); break; case DbType.ODBC: this.dbf = new OdbcDb(); break; case DbType.OLEDb: this.dbf = new OleDb(); break; } } public void init(string dburl) { this.selectDbType(); this.dbf.init(dburl); } public void init(string dburl, string user, string passwd) { this.selectDbType(); this.dbf.init(dburl,user, passwd); } public void connect() { dbf.connect(); } public void disconnect() { dbf.disconnect(); } public DataSet DBAPSelectQuery(string cmd) { return this.dbf.DBSelectQuery(cmd); } public void DBAPInsertQuery(string cmd) { this.dbf.DBInsertQuery(cmd); } public IDataReader DBDataReader(string query) { return this.dbf.DBDataReader(query); } } Factory class which implements factory design pattern: /// <summary> /// Factory Design Patterns implementation. /// At the present time abstraction if MS SQL Server, ODBC and OLEDB /// interfaces implemented. In case of neccessety, any other interfaces /// can be easily implemented. /// </summary> public abstract class AbstractDBFactory { // database url string protected string url = null; // database username protected string username = null; // database password protected string password = null; // simple initialize by url public void init(string dburl) { if(dburl == null) { throw(new ArgumentException("Illigal agruments")); } this.url = dburl; } // full initialize public void init(string dburl, string user, string pass) { this.init(dburl); this.username = user; this.password = pass; } // clear all settings public void destroy() { this.url = null; this.username = null; this.password = null; } // abstract methods which implemented by SQLServerDb, OdbcDb and OleDb classes abstract public void connect(); abstract public void disconnect(); abstract public DataSet DBSelectQuery(string cmd); abstract public void DBInsertQuery(string cmd); abstract public IDataReader DBDataReader(string cmd); } And SQL Server implementation: /// <summary> /// MS SQL Server interface implementation. /// </summary> public class SQLServerDb : AbstractDBFactory { // connector private SqlConnection sqlCon; public override void connect() { // if base class which stores url, username and passwords not initilized // throw exception if(base.url == null) { throw(new ApplicationException("Class is not initialized. Please run init() first.")); } else { //Disable pooling for sql server if(base.url.IndexOf("Pooling") == -1) { base.url += ";Pooling=false"; } // if username and password properties exists initilize by them otherwise by url if(base.username != null && base.password != null) { this.sqlCon = new SqlConnection(base.url + ";uid=" + base.username + ";pwd=" + base.password); LoggingProcessor.Info("url uid pwd init"); } else { this.sqlCon = new SqlConnection(base.url); LoggingProcessor.Info("url - " + base.url); } try { sqlCon.Open(); } catch (Exception e) { throw new Exception("SQL Server error: " + e.ToString()); } LoggingProcessor.Info("sql server connection established"); } } // simple select query // returns DataSet public override DataSet DBSelectQuery(string cmd) { DataSet ds = new DataSet(); try { if(this.sqlCon.State == ConnectionState.Closed) { this.connect(); } SqlDataAdapter sqlDA = new SqlDataAdapter(); sqlDA.SelectCommand = new SqlCommand(cmd, sqlCon); sqlDA.Fill(ds); } catch (Exception e) { throw new Exception("SQL Server error: " + e.ToString()); } finally { sqlCon.Close(); } return ds; } // simple insert query public override void DBInsertQuery(string cmd) { try { if(this.sqlCon.State == ConnectionState.Closed) { this.connect(); } SqlCommand sqlCmd = new SqlCommand(cmd, this.sqlCon); sqlCmd.Prepare(); sqlCmd.ExecuteNonQuery(); } catch (Exception e) { throw new Exception("SQL Server error: " + e.ToString()); } } // DBDataReader - provides selection and returns SqlDataReader public override IDataReader DBDataReader(string cmd) { try { if(this.sqlCon.State == ConnectionState.Closed) { this.connect(); LoggingProcessor.Info("connection is not initialized. initializing..."); } SqlCommand sqlCmd = new SqlCommand(cmd, this.sqlCon); LoggingProcessor.Info(cmd); //sqlCmd.Prepare(); return sqlCmd.ExecuteReader(); } catch (Exception e) { throw new Exception("SQL Server error: " + e.ToString()); } } // disconnect public override void disconnect() { if(sqlCon.State != ConnectionState.Closed) { try { this.sqlCon.Close(); } catch (Exception e) { throw new Exception("SQL Server error: " + e.ToString()); } } } } Best regards, /Gelios Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109719
  - 16
    - Opening from Excel into a dataset, issue with mixed datatypes I have an excel sheet with a column of mixed data types, i.e., numeric & text. ADO.NET is scanning the first few rows and deciding on numeric so when we come across text, the data becomes blank. That being the case I set the extended properties setting to include IMEX=1 but this seems to be of no help. Below is the stripped out code of what I am attempting to do. Thank you for your help. string sConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Server.MapPath("~/Output/myData.xls") + ";" + "Extended Properties=\"Excel 8.0;IMEX=1;HDR=NO;\""; OleDbConnection oleCon = new OleDbConnection(); oleCon.ConnectionString = sConnectionString; oleCon.Open(); OleDbCommand objCmdSelect =new OleDbCommand("SELECT * FROM [2005$A5:A133]", oleCon); OleDbDataAdapter objAdapter1 = new OleDbDataAdapter(); objAdapter1.SelectCommand = objCmdSelect; DataSet objDataset1 = new DataSet(); objAdapter1.Fill(objDataset1); DataGrid1.DataSource = objDataset1.Tables[0]; DataGrid1.DataBind(); oleCon.Close(); oleCon.Dispose(); Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109710
  - 17
    - How the frick do you call a stored procedure when using OdbcDataAdapter?!? And why the frick is it sooo damn hard to find information on this crap, anyway?!? Help! -Skipward Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109699
  - 18
    - Scrolling and retrieving rows similar like ado recordset Hi, I working on implementing a scrolling and record navigation with ADO.NET. In ado recordset having builtin caching/paging and record navigation methods. but i could find a similar conecpts in ADO.NET classes.. Am i missing something?? In dataset class i cannot set pagesize/cachesize, so if i execute a query with a large resultsets with dataset all the rows loaded in the memory. so iam not getting any cursor navigation conecpt benefits in ado.net classes??? Hari Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109693
  - 19
    - Needing Help Hi, i am trying to make a window application that create graphs (plot data as in excel) for a given set of points, how can i do this? thanx -- Message posted via http://www.dotnetmonster.com Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109691
  - 20
    - Bidirectional cursor navigation Hi, Is there any class supports bidirectional cursor in the ADO.NEt framework? I was looking some of the samples and only talks about SqlDataReader (forward only cursor). Or is there any way i can make use of database cursors in my dotnet application to navigate the records from a table.? Hari Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109687
  - 21
    - using a dataReader with StoredProc I have an oracle storedProc that takes one input parameter and 15 output parameters. Can I get the results of the output parameters in a datareader or must I add 15 output parameters? thanks john Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109682
  - 22
    - How to provide a feedback in accessing the BLOB type data? How to let the user know the progress while accessing BLOB type data? The feedback such as the number of bytes readed/written to database. Regards, ZhangZQ Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109679
  - 23
    - Comparing 2 datasets (or datatables) I want to compare two datasets (of 2 datatables). I just need to know whether the 2 datasets are same or different. I do not want to know how it differs. (I would be nice to have though).. Is there any easy way to accompilsh this. Thanks Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109673
  - 24
    - stored proc /w Oracle and Ado.Net Can someone help me with a very simple task I am trying to execute a stored procedure in an Oracle database using Ado.Net. The following is a code snippet conn = New OracleConnection(mOracleConnectionString) cmd = New OracleCommand cmd.Connection = conn conn.Open() cmd.CommandType = CommandType.StoredProcedure cmd.CommandText = "TW_USER_TEST3" cmd.ExecuteReader(CommandBehavior.Default) The stored proc does not have any input or output parameters. I created it for testing purposes. I had a stored proc that did have input and output but I was getting errors so I thought to create the simplest store proc. The proc doesn't even do anything. I am getting the following error: >> An unhandled exception of type 'System.Data.OracleClient.OracleException' occurred in system.data.oracleclient.dll Additional information: ORA-06550: line 1, column 7: PLS-00201: identifier 'BRAVO_CL21.TW_USER_TEST3' must be declared ORA-06550: line 1, column 7: PL/SQL: Statement ignored >> The following is the stored proc: >> CREATE OR REPLACE procedure tw_users_test3 as begin null; end; / >> I would appreciate any help thank you John Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109669
  - 25
    - ODBCConnection and ASP.NET I have an ODBC connection (to Perforce) using a System DSN. In a console app I can open the connection, in an ASP.Net webform I can't, and get the error... [OdbcException: ERROR [HY000] [ ERROR [HY000] [] I assume it must be permissions? I have tried a few things, firstly making ASPNET (I'm running IIS5) andAdmin user, then giving it permissions to the System DSN registry key, but to no avail. I'm using the 1.1 Framework and the System.Data.Odbc.OdbcConnection object. Anbody got any ideas? Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109668
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  - 1
    - Continious DataTable.Select without AcceptChanges on every table leaks memory Hi everybody, we had very strange memory usage in our application when continiously updating a dataset. We were able to exactly localize the problem in the datatable.Select method. Each time we check the datatables for changes with Select, there is an internal index build. These indexes are later deleted when you pass the datatable to the dataadapter. But in our code we have a lot of tables in the dataset where we check all for changes and only update the ones with changes. When the changes only occur in the same tables for a long time, the other tables get more and more indexes consuming a lot of memory. The following piece of code demonstrate this behaviour. It generates more than 400Meg on my machine, and it's the Select method doing this! Only a call of the AcceptChanges method clears the memory. If your machine doesn't have that much memory, be careful! We have not examined the problem on .NET SP1, perhaps it is fixed. For me, creating a static index without reusing it anytime looks like a bug. Are there any designguides saying that this is not the right way to use/update datasets? Doesn't anybody work with datasets like that? Any comments on that? Helge ---------------------------------------------------- class Class1 { [STAThread] static void Main(string[] args) { // build a very simple DataSet System.Data.DataSet ds = new DataSet(); System.Data.DataTable table = ds.Tables.Add("Table"); table.Columns.Add(new System.Data.DataColumn("ID", typeof(Guid))); // add some Data to your one table to make the effect more dramatic ;-) for (int i = 0; i< 10000; ++i) { System.Data.DataRow row = table.NewRow(); row["ID"] = Guid.NewGuid(); table.Rows.Add(row); } table.AcceptChanges(); // dump memory before Class1.DumpMemory(); for(int i = 0; i <10000; ++i) { // this simple select (doing nothing) executed 10000 times generates over 400Meg of memory! // And you don't get rid of it with GC.Collect()! table.Select(null,null,DataViewRowState.ModifiedCurrent); } // dump memory after! Suprise! Class1.DumpMemory(); // only if you call AcceptChanges the memory is cleared! ds.AcceptChanges(); Class1.DumpMemory(); } static void DumpMemory() { System.GC.Collect(); System.Console.WriteLine("TotalMemory: " + GC.GetTotalMemory(true).ToString()); } } Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109667
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    - OnRowUpdated, Rollback in DB, ConcurrencyException and RowState question. Please give your opinions. Hello. If you think this post is too long to read please scroll to the bottom and read the last two sentences. Thank you :) I have a problem which I cannot find a good solution to and hopefully I can get some ideas from the readers of this group. I will first describe my environment for you; I have a database without constraints. It has a lot of tables ofcourse and among all of them are two specific tables. Lets call them Customer and CustomerDetails. In the Customer table there are some columns ofcourse and the last column is DetailsId that works as reference to the CustomerDetails table. The column datatype is an int and points out the Id column in the CustomerDetails table. The Id column in CustomerDetails has autoincrement turned on and is the primary key column. In the dataset in the C# application there is a relation between Customer and CustomerDetails (DetailsId in Customer refers to Id in CustomerDetails). Before a Customer has been "opened" for the first time in the Application the CustomerDetails table does not have any entries which is refered to from the Customer row. The DetailsId value of the specific customer is DBNULL. Now, imagine the following scenario: Person A opens up a customer in the application. Automatically a row in CustomerDetails is added and it's Id value is automatically assigned. This value is then, due to the relation between the tables also inserted into the customer row's DetailsId column. Lets say the value is 20 (because there are 19 other entries in CustomerDetails already). Then Person B opens up the same customer in the application. Same thing happens with the CustomerDetails table in the dataset. It gets a new row with Id 20. Person A changes something in the customer row and then saves all changes back to the DB. Everything works fine so far. Person B changes the same value in the customer row and then also tries to save. What happens now is that first the CustomerDetails table in the dataset is saved to the db. When this happens the RowUpdated event triggers and we get a hint that the actual value of Id has changed in the DB so it is now 21 (since 20 was already taken). With the help of the relation between the tables also the DetailsId value in the Customer table is changed to 21. Then some other updates follow, but finally there is a concurrency in the Customer table since both person A and B have tried to changed the very same rowvalues. A rollback is performed in the database. Person B is informed that a concurrenyexception has been thrown and is now given two options. First option is to loose all of his changes due to the concurrency. Second option is to override the data in the database with his specific changes. The person B chooses the second option since he thinks his changes are more important. What happens now is that data is collected from the database into a new dataset. Then this dataset is merged into the first dataset (in which all of person B's changes are). It is merged with the "preserve changes" flag so that all of the changes that person B has made are still there. Since the DetailsId value has been changed in the RowUpdated event to 21 this value is still 21 in both Customer and CustomerDetails. Though, when the new dataset was filled from the database there was already a row in CustomerDetails (with Id value 20). So after the merge the CustomerDetails table now holds two rows. One with Id 20 and one new with Id 21. In the Customer table the row's value is 21 (which is correct). Now, person B saves for the second time to the DB. Now there is no concurrency and everything seemd to work fine. But everything is certainly not fine. The first problem is that no row in the Customer table refers to the row in CustomerDetails which has Id 20. The second problem is that the row in CustomerDetails with Id value 21 is never saved to the DB so the row in the Customer table now refers to a row that does not exist in the DB. The first problem you probably understand why it occured. The second problem is a little more tricky to understand. Atleast it was for me. The thing is that when person B saved to the DB the very first time all of the rows that were saved before the concurrency occured had it's rowstate property changed from added/modified to unchanged. Then the rollback was done in the DB, but the dataset were still "changed". That is why the row in CustomerDetails was not saved when person B saved to the DB the second time. To fix the second problem I have this solution in mind; If I first make a copy of the changes (before person B is saving for the first time) in the dataset with dataset.GetChanges() and use this "copy" when I update the DB. If everything goes fine with the DB update I can merge any changes (that could have been done due to RowUpdated event activity) from the "copy" dataset back to the original dataset. If something goes wrong with the DB update (i.e. if a concurrency exception is being thrown), I will still have the original dataset unchanged with all rowstates. I can then still give person B the option to "override" the concurrency, which means I refresh a new dataset from the DB and merge the changes into it. Then person B tries to save once again. Question now is, what will happen if I implement my solution? What if the DetailsId in person B's dataset is something different from what's already in the DB (say, 22). Will the existing row (21) that person A once saved have it's Id value changed to 22 du to the merge between the newly refreshed dataset and person B's dataset? Or will there just be a new row added (22) to CustomerDetails so that problem 1 occurs (row 21 will be left on it's own with reference from the Customer table) ? I know that this was a quite big post but I felt I needed to explain everything good enough to get good help. I am VERY thankful if you find a working solution for me. Regards, David. Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109666
  - 3
    - Require Help Regarding Deployment...... This is a multi-part message in MIME format. ------=_NextPart_000_000A_01C54CB2.5B42EED0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi Every Body, I build an application using vb.net. Now i m deploying on the client system. I know that the deployment automatically check the .net framework on the = client system at startup. I include the .net framework in the deployment setup. I want that if the framework is not installed on the client system then = my deployment wizared automatically install the framework which i = include in the deployment package. How can i do this. What are the setttings are needed regarding this. Regards, Muhammad Jamil Nawaz ------=_NextPart_000_000A_01C54CB2.5B42EED0 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 6.00.2900.2604" name=3DGENERATOR> <STYLE></STYLE> </HEAD><FONT face=3DArial><FONT size=3D2> <BODY> <DIV>Hi Every Body,</DIV> <DIV> </DIV> <DIV>I build an application using vb.net.</DIV> <DIV>Now i m deploying on the client system.</DIV> <DIV>I know that the deployment automatically check the .net framework = on the=20 client system at startup.</DIV> <DIV>I include the .net framework in the deployment setup.</DIV> <DIV>I want that if the framework is not installed on the client system = then my=20 deployment wizared automatically install the framework which i include = in the=20 deployment package.</DIV> <DIV> </DIV> <DIV>How can i do this. What are the setttings are needed regarding = this.</DIV> <DIV> </DIV> <DIV>Regards,</DIV> <DIV> </DIV> <DIV>Muhammad Jamil Nawaz</DIV></BODY></HTML></FONT></FONT> ------=_NextPart_000_000A_01C54CB2.5B42EED0-- Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109657
  - 4
    - Large jumps in number connections to SQL DB and Connection Pool Not really sure if I have a problem or not...but, I want to try and understand what is going on. With that said, I haven't ruled out that it's a code problem, but I want to post to see if anyone has seen similar behavior. Basically, throughout the day, we may see "large" jump in the number of connections to our SQL DB and a corresponding jump in the connection pool within a short period of time, i.e., 100+ connection increase in 2 to 3 seconds. The number of users during these jumps are steady...that is, we don't have a large increase of end users (it's an internal call center app). Like I said, I haven't ruled out there being some kind of problem in the application that generates the connections, but I just want to try and persue all avenues. Thanks in advance. Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109653
  - 5
    - Table Mapping with Typed Dataset I've created a strongly typed DataSet, with a 2 related tables. a couple of the columns in the parent are computed with expressions. One of which is a Sum of a Child.column (Sum(Child.UnitCost). Eitherway, since adding these expressions, I'm getting a InvalidOperationException when I execute the Update method of corresponding DataAdapter on the parent. The column names haven't changed from the underlying data source, a table on sql server. Admittedly, at this point in the execution, the child table has not been filled yet, but that's fine, the expression columns can just stay null at this point. What am I doing wrong? Is it case that all expression columns are not meant to be mapped back, but instead are just for use within the dataset? :O( Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109652
  - 6
    - Using gcroot template class and understanding memory utilization. Hi Guys, Iam using a managed dll in my unmanaged MFC application to use ADO.NET classes. so i have a class in the manged dll declared as follows : class __declspec ( dllexport ) CADOInterface { public: //////////// //---- ////////////// int GetCacheRecordIndex(int recordId); public: ///--- /// other declarations /// gcroot<DataTable*> m_pDataTable; }; In one of the method implementation, i have used a local DataRowCollection class. Since the CADOInterface is created in the unmanaged appllication, do i need to use the gcroot template class with the local DataRowCollection class??? if don't use with gcroot class, is there any memory leak??? int CADOInterface ::GetCacheRecordIndex(int recordId) { /// assume m_pDataTable table has some rows gcroot<DataRowCollection*> rows = m_pDataTable->Rows; if(rows) { gcroot<DataRow*> row; int recId; for(int i=0; i < rows->Count; i++) { row = rows->Item[i]; recId = *dynamic_cast<__box Int32*>(row->get_Item(S"RecordId")); if(recId == recordId) return i; } } return 0; } Also do i need to always use gcroot template class with managed classes, when iam using in a unmanaged class?? Hari Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109650
  - 7
    - Using ms access how do I set column that can be of zero length TIA Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109644
  - 8
    - Finding out ADO.NET version How do i find out what version of ADO.NET is being used in my .NET application. Iam building vc++ application in visual studio.net 2003 (7.1 version) and .NET framework version 1.1. I would like use the new feature of ADO.NET 2.0 and need to know i have the correct ado dll's on my system.? The dlls i have on C:\Program Files\Common Files\System\ado folder is msado15.dll like that, is it 1.x or 2.0 version? Hari Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109643
  - 9
    - Repost:Adding rows to DataTable and DataView issue Hi, I thought I had my problem with the dataview and InsertAt fixed, but nope. It looks like it works at first, but then the dataview starts going nuts. And I experience the issue from my other recent post about the dataview containing datarowviews that don't point to an actual row. In fact, if I check the source table, my table can have say 4 rows. But the DataView will have 5, one of which is this phantom one that doesn't point to a real DataRow. I am experiencing something described here: http://groups-beta.google.com/group/microsoft.public.dotnet.framework.windowsforms/browse_thread/thread/5b274676ce51dc99/dfb4d5d987d4b371?q=DataViewRowState.CurrentRows+insertat&rnum=1&hl=en#dfb4d5d987d4b371 Seems there is no real solution other then to make a fake column that keeps track of row order. Except then, every time you insert one not at the end, you have to renumber all the rows after it. Help, someone, anyone? Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109642
  - 10
    - Filtering on a Hierarchical recordset Hello, I have a dataset with multiple tables linked through parent child relationships. I want the user to be able to filter on a child table and I'm using the DataViewManager to set the rowfilter for all the tables in the dataset. This does not seem to work. Only the filter on the parent table works. This is an examle of what I'm currently doing: //Create DataView settings for each Table using the DataViewManager m_oppDVM = new DataViewManager(myDataset); // Loop through the DataViewSettings and set Rowfilter for each Table individually String oppTable; foreach (DataViewSetting DVS in m_oppDVM.DataViewSettings) { // Set Default Sort Order = Primary Key for all Tables DVS.ApplyDefaultSort = true; // Set individual Sort and Rowfilter ... oppTable = DVS.Table.ToString(); switch (oppTable) { case "Table1": { DVS.RowFilter = "filter"; } case "Table2": { DVS.RowFilter = "filter"; } case "Table2": { DVS.RowFilter = "filter"; } } } To give you an example, if the user sets a filter on table2, I want to be able to show the user all rows (both parent and child) which match the filter. I am using the wrong approach?? Thanks Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109639
  - 11
    - DataView mystery Hi, For some reasons, these lines of code sometimes differ in results: myDataView.Item(1).row("MyColumn") myDataView.Item(1)("MyColumn") Sometimes the second version throws a NullReferenceException in the System.Data.DataView.IsOriginalVersion(Int32 index) method. So the DataRowView object being indexed to exists. And it definitely exists, because the first version of the code works fine. Can anyone tell me why going through the underlying row is OK, but not through the indexer in datarowview directly? Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109638
  - 12
    - N-tier applications with VB.NET: Where to put everything practically? Hi, I'm developping VB.NET-applications for 2 years now, and I'm now moving on to bigger porjects, so I'm examining the use of Visio for enterprise architects, and 'the design' we should use. I'm my whole carreer already using the concept of the 3 tiers (presentation-, business- and datalayer), but I don't now 'the exact way' to do it (shame on me, hehe). Does anybody know some good articles about this subject? So not the theoretical way, but really more practical. What do I have to put actually in which layer? Les't take for exemple a simple application that let the user administer the Northwind-database. - Do I create one big Datalayer-class with different SqlDataAdapters and 1 DataSet? Or one class with one SqlDataAdapter and its own DataSet that I inherit for every object/table? - The logic behind for exemple a "Save"-button on a Form with a DataGrid: Do I put this in the Business Layer, or in the Presentation Layer? - The same with for exemple a button that will open a Form that shows all the Orders of a Customer? Where do I search for its Orders etc? - Do I create for each Form its own Business-class? I know I'm asking some really dumb questions, but I'm getting confused, and I really want to know the 'right' way :-) Thanks a lot for any hints, documents, example Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109636
  - 13
    - DataView.RowFilter and DateTime column I'm trying to set the RowFilter = "MyDateTimeColumn in ('2005-02-21')" but it returns 0 rows. I know the row is there. If change the RowFilter to RowFilter = "MyDateTimeColumn not in (all the other dates but 2005-02-21) it returns the rows. Any suggestions? Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109630
  - 14
    - Adding rows to DataTable and DataView issue Hi, Let's say I have an existing view on a table which has 4 rows. If I add a row to the table at position 2, the view treats it as position 5, instead of it's physical location. Note: there is no sort on the view. So, the order in the datatable, should be exactly the same as the order in the view. Am I missing something obvious? How to make the view look at the row order correctly? Thanks Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109628
  - 15
    - retrieve default values Hi, I am trying to export info about a SQL server database in vb.net. I need to retrieve the following info about the fields in the tables: names, data type, length and default values. I have used the following code to retrieve the first three properies: Dim strSQL As String = "SELECT * FROM " + CStr(DBDS.Tables(0).Rows(count)("TABLE_NAME")) Dim aReader As OleDbDataReader Dim oledbCmd As OleDbCommand = New OleDbCommand(strSQL, oleDBConn) aReader = oledbCmd.ExecuteReader() Dim schemaTable As DataTable = aReader.GetSchemaTable() Dim ColumnName As String = schemaTable.Rows(0)("ColumnName").ToString() Dim Length As String = schemaTable.Rows(0)("ColumnSize").ToString() Dim DataType As String = schemaTable.Rows(0)("DataType").ToString() aReader.Close() However, I cannot find a way to find the default value for each field. Does anyone know how to do this? I have searched the newsgroups and can't find an answer - some people talk about using ADOX, but apparently this doesn't work with .NET? Any help, even just to be told it's not possible, would be appreciated!! Thanks, Kath Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109627
  - 16
    - connection object and GC Hi, I would like to concrete my understanding about my custom object using an ADO.NET connection object and the behavior of garbage collector. I have a simple .NET object public class DBACCESS { public void OpenConnection() { SqlConnection cn = new SqlConnection(connection_string); // some code here } } Here is my client code; DBACCESS db1 = new DBACCESS(); db1.OpenConnection(); db1 = null; Now, I would like to confirm that when the GC collected my db1 object, will it also close/release the connection object used by the object instantiated by my client code (which is the db1)? Thanks! Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109624
  - 17
    - Prevent row access until transaction committed We have a database that is accessed by the web to display the data. We also have programs that insert or update to that database. What I want to be able to do is insert data using a transaction but I don't want the web page to display any new rows being inserted until the transaction is committed. So, for example, the program begins a transaction to insert an order header and a number of order details In the meantime, someone requests data using the web page. I don't want my new rows being returned to the web page until the transaction that is inserting (or updating) them is committed. I tried playing around with the isolation levels but that did not seem to have any effect. Thanks for the help. Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109623
  - 18
    - data access layer In VS 2003 we used Data access layers intensively. Is the same pattern valid for VS 2005? Or new data source features ceases its existence... Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109617
  - 19
    - Two nested relations, but one is to itself Hi. I have an XSD which describes a set of objects which one is both contained in a parent, as well as referencing itself again (recursively). XSD.exe doesn't like it very much and complains about: "The same table cannot be the child table in two nested relations." I have read all over the web about this, which seems to be a limitation in .Net, but everywhere I read it is regarding an item which is referenced by two different parents. My problem is a little different and I was wondering if anyone has a solution. I have full control over the XSD, but it must be standard (not MS specific) and compliant. My XML looks something like this: <Root> <Main> <Name>Service</Name> <pg> <pg_name>One</pg_name> <pg> <pg_name>One_1</pg_name> </pg> </pg> <pg> <pg_name>Two</pg_name> <pg> <pg_name>Two_1</pg_name> </pg> </pg> </Main> </Root> Both Main and pg are the parents of pg. What XSD can describe this and be .Net friendly? Thanks Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109615
  - 20
    - Connecting to the IdX I need information on how to program to retreive information in the indexing service. Can anybody show me when there examples. Thanks in advance Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109613
  - 21
    - problem wuth oracle 9i unable to load oramts.dll when i am trying to open the connection it is show the above problem. get me the solution. From http://www.developmentnow.com/g/7_2004_6_0_11_0/dotnet-framework-adonet.htm Posted via DevelopmentNow.com Groups http://www.developmentnow.com Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109609
  - 22
    - Could not determine which columns uniquely identify the rows for ..... Ive read about similar problems here. Im using a SQL 2000 db. Im trying to use the VS .NET designer to drag 'n' drop tables from Server explorer to my component and receive this error message. My table is uniquely identified by a primary key, so I dont understand the problem. Do you have any ideas? *** Sent via Developersdex http://www.developersdex.com *** Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109608
  - 23
    - oracleparameter returns empty resultset these two parameter field are varchar type in DB. when I pass an empty string in one of the paramters the result set is empty. but if I one parameter is something other than empty string, and the other is existing value in the db, the result is correct. Any idea ? string SQL = "Select * from GAESTEST where MEMBERNR = :MemberNr or NAME = :Name"; OracleCommand Cmd = new OracleCommand(SQL, OraConn); Cmd.CommandType = CommandType.Text; Cmd.Parameters.Add("MemberNr", txtMemberId.Text); Cmd.Parameters.Add("Name", txtName.Text); OraConn.Open(); Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109607
  - 24
    - Unable to display child rows I created a dropdown list and a datagrid in a webform. When a customer's name is selected in the dropdown list, a "SelectedIndexChanged" event is raised and the orders for that customer would be displayed in the datagrid. The following code was written but the orders were not displayed after a customer is selected from the dropdown list. Anyone knows what's wrong ? ************************************************ Private Sub lstCustomer_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lstCustomer.SelectedIndexChanged Dim drNew As New DataRelation("CustOrders", ds.Tables("Customers").Columns("CustomerID"), ds.Tables("Orders").Columns("CustomerID")) Dim strCurrent As String = lstCustomer.SelectedItem.Value Dim dvCustOrders As New DataView(ds.Tables("Customers")) Dim drView As DataRowView dvCustOrders = drView.CreateChildView(drNew) dvCustOrders.RowFilter = "CustomerID='" & strCurrent & "'" dgCustOrders.DataSource = dvCustOrders dgCustOrders.DataBind() End Sub Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109602
  - 25
    - time keeps converting itself to date! I am accessing an Access db. I generated the adapter and ds thru the wizard. I have a datetime field in the database (simply called Time) that I am posting to from a textbox. I had to convert it to dattime format, which seems to go fine, but when I execute the update, it strips the time portion and just leaves the date. Here is my conversion code: dr("Time") = DateTime.Parse("9:32 PM") Thanks in advance! Tag: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) Tag: 109593

Well I am trying to compile an app With VS2005 Beta 2 that used the
Data Access Application Blocks.

I am getting this error
There is an error in XML document (7, 48).

In my XML it referes to this Application Blocks line
<keyAlgorithmStorageProvider xsi:nil="true" />

Is there a fix or workaround for this?

Thanks,

Ed,

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Re: VS2005 Beta 2 and Data Access Application Blocks (Enterprise Library) by Miha

Miha
Mon May 02 15:29:45 CDT 2005

Hi,

I don't think enterprise library is quite yet ready for .net 2.
You might take a look at the www.gotdotnet.com and its workspaces where
enterprise library home is - they have a well populated forum.

--
Miha Markic [MVP C#] - RightHand .NET consulting & development
www.rthand.com
SLODUG - Slovene Developer Users Group www.codezone-si.info

"gencode" <google@gencode.com> wrote in message
news:1115054639.156872.282180@f14g2000cwb.googlegroups.com...
> Well I am trying to compile an app With VS2005 Beta 2 that used the
> Data Access Application Blocks.
>
> I am getting this error
> There is an error in XML document (7, 48).
>
> In my XML it referes to this Application Blocks line
> <keyAlgorithmStorageProvider xsi:nil="true" />
>
> Is there a fix or workaround for this?
>
> Thanks,
>
> Ed,
>

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