Nested DataRelation

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  - 1
    - How to create a new DataRow - curious NewRow behavior I am wondering how to create an instance of a row of a table in a typed dataset to use as a local variable. I can't use the DataTable's method NewRow() because it seems that the table has a new row buffer, to which it returnes a reference on every call to NewRow() Take a look at the following code: Dataset1 ds = new Dataset1(); DataRow nr = ds.Tbl.NewRow(); ds.Tbl.Clear(); //DataRow nr2 = (new Dataset1()).Tbl.NewRow(); DataRow nr2 = ds.Tbl.NewRow(); nr2["ID"] = 1; nr2["Name"] = "Name"; ds.Tbl.Rows.Add(nr2); //data result //nr["ID"] is "1" //nr["Name"] is "Name" nr2 = ds.Tbl.NewRow(); nr2["ID"] = 2; nr2["Name"] = "Name2"; ds.Tbl.Rows.Add(nr2); ds.Tbl.AcceptChanges(); nr["ID"] = ds.Tbl.Rows[1]["ID"]; nr["Name"] = ds.Tbl.Rows[1]["Name"]; //data result //ds.Tbl.Rows[0]["ID"] is "2" //ds.Tbl.Rows[0]["Name"] is "Name2" You see from the data results that when a value is changed to a row that is created with NewRow() the values in the other row that we create with NewRow() are also changed. A way to work this around is to call NewRow() method of a new dataset's table, as commented out in the code: //DataRow nr2 = (new Dataset1()).Tbl.NewRow(); Any other ideas? Well, i just realised that I can use ds.Tbl.Clone().NewRow() instead of (new Dataset1()).Tbl.NewRow() that lowers the overhead but the problem still remains. Any oppinions are appreciated. P.S. I'm using the following dataset: <?xml version="1.0" encoding="utf-8" ?> <xs:schema id="Dataset1" targetNamespace="http://tempuri.org/Dataset1.xsd" elementFormDefault="qualified" attributeFormDefault="qualified" xmlns="http://tempuri.org/Dataset1.xsd" xmlns:mstns="http://tempuri.org/Dataset1.xsd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"> <xs:element name="Dataset1" msdata:IsDataSet="true"> <xs:complexType> <xs:choice maxOccurs="unbounded"> <xs:element name="Tbl"> <xs:complexType> <xs:sequence> <xs:element name="ID" type="xs:int" minOccurs="0" /> <xs:element name="Name" type="xs:string" minOccurs="0" /> </xs:sequence> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> <xs:key name="PK_Tbl" msdata:PrimaryKey="true"> <xs:selector xpath=".//mstns:Tbl" /> <xs:field xpath="mstns:ID" /> </xs:key> </xs:element> </xs:schema> Tag: Nested DataRelation Tag: 87431
  - 2
    - Does anybody use Data Access Application Block in Asp.Net? I found "Data Access Application Block" has a feature of caching sqlparameters. I'm doubt that feature can use under multi-thread environment such as Asp.Net. Maybe one SqlParameter instance is using by SqlCommand.ExecuteXXX(), while another SqlCommand attempt to use the SqlParameter instance again! Tag: Nested DataRelation Tag: 87419
  - 3
    - "Additional information: Object must implement IConvertible." HI I am using Microsft Data Access building block And i am getting following error An unhandled exception of type 'System.InvalidCastException' occurred in eval.ex "Additional information: Object must implement IConvertible. my code look like thi SqlParameter paramFName = new SqlParameter("@FNAME",SqlDbType.Char,25) paramFName.Value = "A" SqlParameter []parm = new SqlParameter[1] {paramFName }; SqlHelper.ExecuteNonQuery(this.connectionstring1, "AddPatient", parm) thanks in advanc -p Tag: Nested DataRelation Tag: 87418
  - 4
    - OUTPUT parameters Hi everybod I have a Stored procedure(SyBase 12.5) that returns a OUTPUT value, but it always returns a DBNull. I test the SP in other application (DBArtisan like a Query Analizer) and it returns the correct value, but when I test in my NET application (made in C#) it returns DBNull. If I try to make a cast I get the exception "Object cannot be cast from DBNull to other types This is my code my SP CREATE PROCEDURE dbo.sp_Prueba @vsTransId char(4) @vsContratoId varchar(4) @vsLoginUser varchar(40) @vsParamList varchar(200) @iResp int OUTPU A Declare @iError in Declare @OK in BEGI Select @iError = Select @OK = BEGIN TRAN Prueba Insert into LogTransacc Values (@vsTransId,@vsContratoId,@vsLoginUser,"Pruebas Juan",@vsParamList,"Ini",getdate() Select @iError = @@erro if(@iError = @OK) Begi Select @iResp = @OK COMMIT TRAN Prueba En els Begi Select @iResp = @iErro ROLLBACK TRAN Prueba En EN And this my function private void Insertar() string strcadena = cadenaConn OleDbConnection oleConn = null try oleConn = new OleDbConnection(strcadena) oleConn.Open() OleDbCommand oleCmmd = new OleDbCommand() oleCmmd.CommandType = CommandType.StoredProcedure oleCmmd.Connection = oleConn oleCmmd.CommandText = "sp_Prueba" oleCmmd.Parameters.Add("@vsTransId",OleDbType.Char,4) oleCmmd.Parameters["@vsTransId"].Value = "9500" oleCmmd.Parameters.Add("@vsContratoId",OleDbType.VarChar,4) oleCmmd.Parameters["@vsContratoId"].Value = "0000" oleCmmd.Parameters.Add("@vsLoginUser",OleDbType.VarChar,40) oleCmmd.Parameters["@vsLoginUser"].Value = "Juan Carlos Gonzalez" oleCmmd.Parameters.Add("@vsParamList",OleDbType.VarChar,200) oleCmmd.Parameters["@vsParamList"].Value = "Esta es una prueba para insertar utilizando Threads" oleCmmd.Parameters.Add("@iResp", OleDbType.Integer) oleCmmd.Parameters["@iResp"].Direction = ParameterDirection.Output oleCmmd.ExecuteNonQuery() if(oleCmmd.Parameters["@iResp"].Value.Equals(System.DBNull.Value) MessageBox.Show("OUTPUT Null") els MessageBox.Show("OUTPUT No null") oleCmmd.Dispose() catch(Exception Ex) Console.WriteLine(Ex.Message) finally if(oleConn != null) if(oleConn.State != System.Data.ConnectionState.Closed) oleConn.Close() Does someone help me, please Regard J.C. Tag: Nested DataRelation Tag: 87409
  - 5
    - Drop Down List Help Hey guys! I wrote a script with 2 dropdown lists. When the value on one is selected it should automatically load the corresponding value from the table on the second list. This for some apparent reason is not working. Label1.Text=this.ddList1.SelectedItem.ToString(); SqlCommand sqlCmd2 =new SqlCommand("SELECT Name FROM pricesTB1 WHERE Location="+Label1.Text,conn); conn.Open(); SqlDataReader read2=sqlCmd2.ExecuteReader(); while (read2.Read()) { //ListItem NewItem2 = new ListItem(); //NewItem2.Text=read2.GetString(0); //NewItem2.Value = read2.GetValue(0).ToString(); //ddList2.Items.Add(NewItem2); Label2.Text=this.ddList1.SelectedItem.ToString(); } conn.Close(); It works fine when i explicitely define the SQL Command but when i read it using this.ddList1.SelectedItem.ToString(); it messes up...Please help me. Thanks Tag: Nested DataRelation Tag: 87407
  - 6
    - using hyperlink on data grid, need to spawn new window I am using a hyperlink as a column in a datagrid. I noticed that it does redirect to the hyperlink but just wondering ho to have it open a new broswer window, leaving the window with the datagrid open in the background Thanks Paul. Tag: Nested DataRelation Tag: 87405
  - 7
    - Simple Q: SqlParameter.Value and Boxing After posting this in .performance newsgroup, I thought it may be more appropriate here. In the following code, when I assigned a ValueType to the Value of a SqlParameter, it gets boxed System.Data.SqlClient.SqlCommand Cmd = new System.Data.SqlClient.SqlCommand("T-SQL HERE", Cn) Cmd.Parameters.Add("@my_id", SqlDbType.Int) Cmd.Parameters["@my_id"].Value = prmMyId; //Boxing of integer happens here Is there any way around this Tag: Nested DataRelation Tag: 87403
  - 8
    - OleDb.OleDbParameterCollection does not work over DBLink Hi, I am trying to pre-fetch parameter info for a stored procedure in a remote DB over a dblink. When I execute the DeriveParameter statement I get an exception message: "The stored procedure" {name} doesn't exist". However, if I add the parameter manually and call ExecuteNonQuery, the call succeeds. Info: .NET v1.1 Oracle 9i client driver private synonym for SP on local DB (DBINST1) SP resides on DBINST2 public DBLink below is the code that fails: string ConnectionString = "Provider=MSDAORA;Data Source=DBINST1;User ID=user;Password=..."; System.Data.OleDb.OleDbConnection con = new OleDbConnection(ConnectionString); try { con.Open(); OleDbTransaction tx = con.BeginTransaction(); OleDbCommand cmd = new OleDbCommand(_spName,con, tx); cmd.CommandType = CommandType.StoredProcedure; /* THE OFFENDING CODE THAT THROWS THE EXCEPTION */ if( _callDeriveParam ) { System.Data.OleDb.OleDbCommandBuilder.DeriveParameters ( (System.Data.OleDb.OleDbCommand) cmd ); } else cmd.Parameters.Add("@PID", OracleType.Number).Value = 102; cmd.ExecuteNonQuery(); con.Close(); MessageBox.Show("Call to stored procedure using MS OLEDB succeeded"); } catch ( Exception ex) { MessageBox.Show("ERROR: " + ex.Message + '\n' + ex.StackTrace, "Call to OleDBCommandBuilder.DeriveParameters failed!", MessageBoxButtons.OK, MessageBoxIcon.Error); } } Any help would be appreciated. -Arif Tag: Nested DataRelation Tag: 87399
  - 9
    - rowchanged event Hi, This is a half question/half gripe: In the RowChanged event of a DataTable, if the event signals a row addition (e.Action == DataRowAction.Add), why oh why is the DataRow added only after the event has been fired? This is completely unintuitive, and seems just plain wrong. It also allows for the following code: private void DataTable_RowChanged(object sender, DataRowChangeEventArgs e) { if (e.Action == DataRowAction.Add) // evaluates true! { if (myDataTable.GetChanges() == null) // quite possibly evaluates true! { BecomeFrustrated(); QuitJob(); StartDeliveringPizza(); } } } Erik Tag: Nested DataRelation Tag: 87398
  - 10
    - Like problem and question I am using an access database and executing the following piece of code: IDbConnection con = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\\test.mdb;Persist Security Info=False"); try{ con.Open(); IDbCommand cmd = con.CreateCommand(); cmd.CommandText = "SELECT * FROM MyTable WHERE Tag Like 'A*'"; IDataReader reader = cmd.ExecuteReader(); if(!reader.Read()) MessageBox.Show("Fail"); else reader.Close(); } The fail message box is always shown, what means that no data was found. My column "Tag" has several registers with the value "AlrDigCmd[1]". If I try to use Tag = 'AlrDigCmd[1]', it works. I need to use wildcards, does anyone know what am I doing wrong? Also, is the "Like" predicate available to any provider or it may not be depending on the implementation? Another issue that I have is that I would like a case insensitive query. What would be the best way to do it? I would really appreciate any help. Lourenço. Tag: Nested DataRelation Tag: 87397
  - 11
    - Multi-table DataSet...Select statement?? Hi, I am fairly new to DataSets and such and am hoping there is am obvious answer to my problem. I am retrieving data from XML and dumping it into an dataset. The resulting dataset contains 4 related tables, that is, the data relations are already there. Now to my problem. I want to be able to select only certain colunms of data from accross the tables in the dataset. Basically, I just need to do a T-SQL like multi-table join. Is there a way to retrieve my records in this way? The idea is to retrieve only the columns of data I need and then insert them into my database. If not possible, perhaps using a dataset is the wrong way to go. Any help would be greatly appreciated. Thanks. -Phil Tag: Nested DataRelation Tag: 87390
  - 12
    - DataSet/DataTable relationships question Hi.. I've been working with standalone DataSets and DataTables. I've defined a schema to model some xml data like the following <Root><Client id="1" total="Sum(Child(rel).cost)" updated="Max(Child (rel).updated"><Order id="1" cost="12" updated="<date>"/><Order id="1" cost="3" updated="<date>"/ .. </Client .. </Root With the schema to represent this, I end up with 2 tables, Client and Order with a relationship defined making Order the child of Client. Two columns in Client are defined as operations on the child table orders The problem I'm running into now is that after the first query on Client, total and updated both get set according to the current state of Order but never get updated again. Subsequent queries on Client after there have been changes on Order don't reflect the Order changes Is there a way to structure this or a flag to set to allow this to work Thank -Mar Tag: Nested DataRelation Tag: 87381
  - 13
    - How do I write a "null" into dateTime and decimal columns? I am attempting to parse data from a flat file into a DataSet table. Some of the columns are amount fields (decimal) or dateTime. The flat file can contain spaces or low-values in cases where there is no valide money or date. These should be treated as "null". How do I initialize these columsn to null in this case. (I'm thinking of something like DBNull) Tag: Nested DataRelation Tag: 87377
  - 14
    - Newbie - Development vs Deployment with MSDE Hi all! I have installed MSDE on the development machine. Server Name = DevComp When using the wizard to generate the SqlConnectCommand it sets the server name to DevComp. Thinking ahead to when I deploy this application... The end user's computer will not be DevComp, it may be DaComputer (who knows). What is the best way of handling this? Tag: Nested DataRelation Tag: 87376
  - 15
    - Datagrid Child Insert New Row ForeignKeyConstraint Problem Hi, This is a strange problem... I have a Access database with 2 tables, a master with 1 primary key (pk) and a child with 2 pk's. One client can have one or more orders. Clients *id name Orders *fkClient *id units price So far so good. I created in VS2003 using the "DataForm Wizard" a simple master-detail form with the "Single record with individual controls" option. (I only have this problem with this option, there's no problem with to data grids). This creates a simple data form with some text boxes and a data grid, witch is ok view data.. The problem is, when i add a new record (this only happends to the new added records) and when a insert a new row on the data grid I get the folowing error "Error when commiting the row to the original data store : ForeignKeyConstraint rel_FKClient_ID requires a child key value (1) to exist in the parent table. Do you want to correct the value?" The dataset is MyDS and the relation is parent.id to client.fkClient. I beliave that this is due to the fact that the new created record does not yet exist in the parent dataset. But why!? Instead of having individual controls if I put 2 datagrid, one for the parent and the one for the child, this problem does not exist. I have tried to put an autoincrement, just for testing, and when i add a new row to the orders datagrid the correct client id appears, but the problem remains. How can I overcome this without having to update the dataset before adding a new row to the child datagrid. Please share some information, cause I'm freaking out....... Thanks to all. -------------------------------- From: Rui Gon?alves ----------------------- Posted by a user from .NET 247 (http://www.dotnet247.com/) <Id>rxyhmE7dn06wiA5MoAlEiw==</Id> Tag: Nested DataRelation Tag: 87375
  - 16
    - Recursive fill of a tree from sql query Hello, Has anyone here ever used recursion to take the results of ONE sql = query, and fill a tree object accordingly. Here is my situation. I'm = storing data on "templates", and certain templates can fall under other = templates. From a data standpoint in sql server, I have a [parent] = column, that contains the id of its parent (the primary key of the = table), if this parent is "0", I'm assuming its parent will be my root = node. My strategy for doing this was to have one datatable (the results of the = query), and then set dataviews in the recursive function to look at the = desired [parent], if one exists, add that node to the tree, then call = the same function again with the new parent. Here is my code I have: 'dt is my datatable, it is filled before this Dim node As TreeNode =3D New TreeNode node.Text =3D "All Templates" node.NodeData =3D "0" FillTemplates(dt, "0", node) tv.Nodes.Add(node) ... Private Sub FillTemplates(ByRef dt As DataTable, ByVal parent As = String, ByRef node As TreeNode) Dim dv As DataView =3D dt.DefaultView dv.RowFilter =3D "[parent] =3D '" & parent & "'" Dim i As Integer, count As Integer count =3D dv.Count - 1 For i =3D 0 To count Dim newNode As TreeNode =3D New TreeNode newNode.Text =3D CStr(dv.Item(i)("label")) newNode.NodeData =3D CStr(dv.Item(i)("tmpID")) FillTemplates(dt, newNode.NodeData, newNode) node.Nodes.Add(newNode) Next End Sub .... This works..., until I have a nested depth of 3, then it breaks (the = dataviews are getting messed up from prior recursive calls). I'm not = really after fixing this function just yet, I'm throwing this question = out in hopes someone may offer an entirely different way of going about = this. Anyone ever know of an easier way? --Michael Tag: Nested DataRelation Tag: 87373
  - 17
    - How fill Dataset from XML file? How do I use an XML file to fill a dataset? Any code examples? XML format: <Server> <Name></Name> <Ip></Ip> <OS></OS> </Server> The XML file has 10 of these records. Thanks! Tag: Nested DataRelation Tag: 87371
  - 18
    - hellp datagrid/dataset columns is there a way to set a column in a datagrid to a size and not wrap text nor expand the column to allow the all the items in that cell to be seen. I want the string in that dataset to be cut short if the string is too long for the cell? Tag: Nested DataRelation Tag: 87365
  - 19
    - datagrid question Hi all, I bind an sql table to a datagrid. The table has a status column, this is smallint. I would like to write "Busy" to the datagrid, if status=0, "Done", if status=1, and "error" if status=2 and not 1,2,3. How can I solve this problem? Thank you very much in advance! Best regards, Bálint Tóth Tag: Nested DataRelation Tag: 87364
  - 20
    - Visual Database Tools and Oracle 9i I'm stumped. We recently switched from Oracle 8i to Oracle 9i and now I am unable to use the Visual Database Tools on them in Visual Studio Tag: Nested DataRelation Tag: 87356
  - 21
    - OlsDbCommand.Cancel does not stop SQL Dear Newsgroup when I kick off stored procedure through an OleDbCommand, it seems impossible to stop it again. In a different thread, I call OleDbCommand.Cancel, but this call waits for the stored procedure to finish instead of killing it. Unlike SQL Query Analyzer, my c#-programm can not interrupt a running stored procedure What's the trick ?? Tag: Nested DataRelation Tag: 87355
  - 22
    - getting ADO-like properties from OleDbConnection ADO connection objects had a Properties array which you could iterate to determine connection string values, such as "Persist Security Info" and the like. Is there any facility in ADO.NET to do this aside from parsing the ConnectionString? Tag: Nested DataRelation Tag: 87348
  - 23
    - General Network Error I get the following exception when doing a simple statement like SELECT * FROM MyTable, I am using SQL Server 2000 and ADO.Net as the client using framework 1.1, I get this error periodiodically. Please help, Exception message: iE.AM.Runtime.AMSQLException: Unable to perform SqlCmd --- > System.Data.SqlClient.SqlException: General network error. Check your network documentation. at System.Data.SqlClient.SqlConnection.OnError (SqlException exception, TdsParserState state) at System.Data.SqlClient.SqlInternalConnection.OnError (SqlException exception, TdsParserState state) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParser.ReadNetlib(Int32 bytesExpected) at System.Data.SqlClient.TdsParser.ReadBuffer() at System.Data.SqlClient.TdsParser.ReadByteArray(Byte [] buff, Int32 offset, Int32 len) at System.Data.SqlClient.TdsParser.ReadDouble() at System.Data.SqlClient.TdsParser.ReadValue (_SqlMetaData md, Int32 length) at System.Data.SqlClient.TdsParser.ProcessRow (_SqlMetaData[] columns, Object[] buffer, Int32[] map, Boolean useSQLTypes) at System.Data.SqlClient.SqlDataReader.PrepareRecord (Int32 i) at System.Data.SqlClient.SqlDataReader.GetValues(Object [] values) at iE.AM.Sql.Utilities.SqlBase.ProcessSqlCurOpenOperation (Object param) --- End of inner exception stack trace ---: General network error. Check your network documentation.: at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, TdsParserState state) at System.Data.SqlClient.SqlInternalConnection.OnError (SqlException exception, TdsParserState state) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParser.ReadNetlib(Int32 bytesExpected) at System.Data.SqlClient.TdsParser.ReadBuffer() at System.Data.SqlClient.TdsParser.ReadByteArray(Byte [] buff, Int32 offset, Int32 len) at System.Data.SqlClient.TdsParser.ReadDouble() at System.Data.SqlClient.TdsParser.ReadValue (_SqlMetaData md, Int32 length) at System.Data.SqlClient.TdsParser.ProcessRow (_SqlMetaData[] columns, Object[] buffer, Int32[] map, Boolean useSQLTypes) at System.Data.SqlClient.SqlDataReader.PrepareRecord (Int32 i) at System.Data.SqlClient.SqlDataReader.GetValues(Object [] values) at iE.AM.Sql.Utilities.SqlBase.ProcessSqlCurOpenOperation (Object param) Tag: Nested DataRelation Tag: 87345
  - 24
    - Creating Access 97 database programatically HI , Can anyone tell me how can i create a .mdb(access 97) database using ado.net in vb.nety. I dont want to use adox. Can this be acheived in ado.net . any help will be appreciated. Cheers, Jiten --- Posted using Wimdows.net NntpNews Component - Post Made from http://www.DotNetJunkies.com/newsgroups Our newsgroup engine supports Post Alerts, Ratings, and Searching. Tag: Nested DataRelation Tag: 87342
  - 25
    - "A connection pooling error has occurred." exception thrown randomly when SqlConnection.Close(). (In Dispose() method) I'm making a databse management tool with VS.NET 2003 C#. The InvalidOperationException occured RANDOMLY. "A connection pooling error has occurred." I'm accessing SQL server 2000 (MSDE Release A) through SqlConnection. The database that I'm using is set as SINGLE USER by EM. So I created one connection object and reused it repeatly. (Connection is keeping open during application is running.) No exception when working and running, but the exception thrown when application closing. (Exactly, when SqlConnection.Close () method called.) I searched ms .net newsgroup (by google), I know I have not to use SqlConnection.Close() in any destructor routine, and my code has no destructor at all project. (Even no "~" character on whole sources.) I didn't call Close() method at any destructor, and Close () method is places on Dispose() method currently. My SqlConnection is wrapped by a component that placed on a form by the designer. PS. I have to use SINGLE USER option, cause there is special reason, please don't discuss about it. THIS IS EXCEPTION DETAILS: - $exception {System.InvalidOperationException} System.InvalidOperationException - System.SystemException {"A connection pooling error has occurred."} System.SystemException - System.Exception {"A connection pooling error has occurred." } System.Exception System.Object {System.InvalidOperationException} System.Object _className null string _COMPlusExceptionCode -532459699 int _exceptionMethod <undefined value> System.Reflection.MethodBase _exceptionMethodString null string _helpURL null string _HResult -2146233079 int _innerException { } System.Exception _message "A connection pooling error has occurred." string _remoteStackIndex 0 int _remoteStackTraceString null string _source null string + _stackTrace {System.Array} System.Object _stackTraceString null string _xcode -532459699 int _xptrs 0 int HelpLink null string HResult -2146233079 int InnerException { } System.Exception Message "A connection pooling error has occurred." string Source "System.Data" string StackTrace " at System.Data.SqlClient.SqlConnection.Close()\r\n at F176.Database.Generator.Dispose()\r\n at F176.Database.Server.Dispose()\r\n at F176.Database.Manager.Dispose(Boolean disposing)\r\n at System.ComponentModel.Component.Finalize()" string + TargetSite {System.Reflection.RuntimeMethodInfo} System.Reflection.MethodBase + this {F176.Database.Generator} F176.Database.Generator Tag: Nested DataRelation Tag: 87339
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  - 1
    - "A connection pooling error has occurred." exception thrown randomly when SqlConnection.Close(). (In Dispose() method) I'm making a databse management tool with VS.NET 2003 C#. The InvalidOperationException occured RANDOMLY. "A connection pooling error has occurred." I'm accessing SQL server 2000 (MSDE Release A) through SqlConnection. The database that I'm using is set as SINGLE USER by EM. So I created one connection object and reused it repeatly. (Connection is keeping open during application is running.) No exception when working and running, but the exception thrown when application closing. (Exactly, when SqlConnection.Close () method called.) I searched ms .net newsgroup (by google), I know I have not to use SqlConnection.Close() in any destructor routine, and my code has no destructor at all project. (Even no "~" character on whole sources.) I didn't call Close() method at any destructor, and Close () method is places on Dispose() method currently. My SqlConnection is wrapped by a component that placed on a form by the designer. PS. I have to use SINGLE USER option, cause there is special reason, please don't discuss about it. THIS IS EXCEPTION DETAILS: - $exception {System.InvalidOperationException} System.InvalidOperationException - System.SystemException {"A connection pooling error has occurred."} System.SystemException - System.Exception {"A connection pooling error has occurred." } System.Exception System.Object {System.InvalidOperationException} System.Object _className null string _COMPlusExceptionCode -532459699 int _exceptionMethod <undefined value> System.Reflection.MethodBase _exceptionMethodString null string _helpURL null string _HResult -2146233079 int _innerException { } System.Exception _message "A connection pooling error has occurred." string _remoteStackIndex 0 int _remoteStackTraceString null string _source null string + _stackTrace {System.Array} System.Object _stackTraceString null string _xcode -532459699 int _xptrs 0 int HelpLink null string HResult -2146233079 int InnerException { } System.Exception Message "A connection pooling error has occurred." string Source "System.Data" string StackTrace " at System.Data.SqlClient.SqlConnection.Close()\r\n at F176.Database.Generator.Dispose()\r\n at F176.Database.Server.Dispose()\r\n at F176.Database.Manager.Dispose(Boolean disposing)\r\n at System.ComponentModel.Component.Finalize()" string + TargetSite {System.Reflection.RuntimeMethodInfo} System.Reflection.MethodBase + this {F176.Database.Generator} F176.Database.Generator Tag: Nested DataRelation Tag: 87338
  - 2
    - Transaction deadlock Hi All, Does anyone know how to prevent dead lock when selecting records within Transaction?? Let me describe abit clear. I created & open a transaction and before i commit/ rollback the transaction i have to select few records within the same table but the problem is once i execute a select sql statement for serveral times (usually more than 2 times)... the select sql will be hold and the whole application will be hung... I guess the reason is because the transaction haven't finished and as a result the select sql should be on queue I have tried various solutions like changing the transaction level ... but none of them work as needed so.. please tell me if anyone know the solutions... thanks to all Ivan Tag: Nested DataRelation Tag: 87335
  - 3
    - sqlpp framework hi! Have someone work with the sqlpp framework so we can share experiences. sqlpp is a full Database Abstraction Layer Generator. Since version 2.14 sqlpp use a xml to generate c# modell and connection classes, sql querrys and stored procedures. Some interesting features are: * No SQL manipulation: with the generator, you don't write a single line of SQL, * Multiple Database system support: MSSQL, MySQL. Others could be implemented easily, * Handles the stored procedure problem by storing the queries in the web.config if necessary, * Supports complex table join: the generator uses the Boost.Graph.Library on the background to generate the queries * The C# code is documented ! * It's totally free for non-commercial and commercial use!!! (source http://www.codeproject.com/cs/database/dalgen.asp is not up tp date) project homepage: http://sourceforge.net/projects/sqlpp/ Tag: Nested DataRelation Tag: 87332
  - 4
    - Are ado.net apps supported on this platform Hi Can I write ado.net apps that would run on this device; http://www.xda-2.co.uk/under_the_bonnet.html If yes, is an emulator available? Thanks Regards Tag: Nested DataRelation Tag: 87324
  - 5
    - MS DataProvider for Oracle / GUIDs Hi there, are there any future plans to support the GUID datatype within MS DataProvider for Oracle? GUIDs could easily be mapped to a RAW(16) coulnn. Right now I have to do on-the-fly conversion (GUID to Bytearray), and still, OracleCommandBuilder does not seem to map Bytearrays to RAW-columns either (optimistic locking syntax fails on equals operator, as the Bytearray is expanded to lowercase symbols (e.g. 'ff'), where Oracle expectes uppercase symbols). Kind regards, Arno Huetter Tag: Nested DataRelation Tag: 87319
  - 6
    - Replication notification. I am calling a web service that is generating some data that will be replicated to a SQL Server. I would like to know what is the best way to wait for the replication. I would either like to have a function that does not return until replication occurs on a specified table (this particular replication will add a row although there are some instances where the row is simply updated) or somehow flush the information that is replicated. The problem that I am seeing is I am calling the web service but when I look at the DB the row is now present. I have tried to sleep for up to 10 seconds and still I don't see the added row. If I run query analyzer after the web service call I can see the added row. It seems that the thread that called the web service never sees the updated record. Any suggestions Thank you Kevin Burto kburton@visa.co Tag: Nested DataRelation Tag: 87317
  - 7
    - Test - Ignore Tag: Nested DataRelation Tag: 87314
  - 8
    - Dynamic CommandText for an SqlDataAdapter I'm using a DataGrid to display and edit entries from a database= table called Contacts=2E I've completed the MSDN document= "Walkthrough: Using a DataGrid Web Control to Read and Write= Data" and it's working out fine=2E My SQL select command looks= like this: SELECT Id, Name, Phone, Email FROM Contacts Now I want to restrict that query to only display entries with a= certain OrganizationId=2E The OrganizationId I want to use can be= found in Session["OrganizationId"]=2E I basically want this: SELECT Id, Name, Phone, Email FROM Contacts WHERE OrganizationId= =3D THE_ID_FROM_THE_SESSION What I'm asking is how I should do this=2E I've tried editing the= sqlSelectCommand manually in "Web Form Designer generated code"= that was generated for me by the SqlDataAdapter wizard, but if I= even touch that code, VS=2ENET freaks out and removes the= CommandText property completely (and then I am unable to re-add= it!)=2E I guess I could add it via the properties for the= SelectCommand for the SqlDataAdapter in design mode, but I can't= see how to add dynamic data such as a session variable in that= textbox=2E What am I missing/doing wrong? -------------------------------- From: Rickard Andersson ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>Tbf5aLbxl0q3Fn6LEuWR9A=3D=3D</Id> Tag: Nested DataRelation Tag: 87311
  - 9
    - SortOrder's column in GetOLEDBSchemaTable Hi, How do I know SortOrder(ASC or DESC) of key fields in ADO.NET? I could get SortOrder by using ADOX. I can't find near column by GetOLEDBSchemaTable.Primary_Keys/Foreign_Keys. Thanks Tom -------------------------------- From: Tom Hadler ----------------------- Posted by a user from .NET 247 (http://www.dotnet247.com/) <Id>z96rY7znZU2INR0oSrCqQg==</Id> Tag: Nested DataRelation Tag: 87310
  - 10
    - nothing or dispose hi iam closing the connection and later iam using dispose method should i need to use nothin is it neccessary to use nothing for an object?????? pls give me suggestion Tag: Nested DataRelation Tag: 87309
  - 11
    - creating a setup to install into GAC, where can I find an example? Could anyone suggest me some examples/articles on creating a setup program in VS.NET that can install the assembly into the GAC? I have done some search and research myself and have some basic understanding on how to create a setup program. All the articles about Windows Installer 2.0 is the best way to install your assembly into GAC but I haven't found one shows what exactly I need to do differently in my VS.NET setup project in order for it to stick the assembly into GAC. Bob Tag: Nested DataRelation Tag: 87303
  - 12
    - Strongly typed DataSet with xsd.exe I generate an XML file with the WriteXmlShema method of the DataSet object. Then, I use xsd.exe to make it a strongly typed DataSet, witch generate a Visual basic code file, MyDataSet.vb. xsd.exe /d /l:VB "MyDataSet.xsd" When I add both files, MyDataSet.xsd and MyDataSet.vb, to my Visual Studio project, MyDataSet.vb does not appears as a child node of MyDataSet.xsd like when you create a strongly typed Dataset by dropping a table on the DataSet designer. Is there a way to tell VSNet that MyDataSet.vb is to be linked with MyDataSet.xsd? Thanks a lot Frederic Goulet Tag: Nested DataRelation Tag: 87301
  - 13
    - Exporting XML Schema This is a multi-part message in MIME format. ------=_NextPart_000_00A3_01C4382A.B02408F0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I know there is a way to do this as I have done it before with Crystal = Reports tech support on the phone. I (mistakenly) have misplaced that = code. What I need to do is convert a dataset into an XML schema file = that I can use to generate another Crystal Report.=20 Thanks in advance for any help that you can give me. ------=_NextPart_000_00A3_01C4382A.B02408F0 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 6.00.2800.1400" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>I know there is a way to do this as I = have done it=20 before with Crystal Reports tech support on the phone. I (mistakenly) = have=20 misplaced that code. What I need to do is convert a dataset into an XML = schema=20 file that I can use to generate another Crystal Report. </FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Thanks in advance for any help that you = can give=20 me.</FONT></DIV></BODY></HTML> ------=_NextPart_000_00A3_01C4382A.B02408F0-- Tag: Nested DataRelation Tag: 87299
  - 14
    - What's the benefit of using VS.Net's "Generating Dataset..."? This may be a newbie question. I used to just define (VB.Net for example): dim dt as new DataTable dataAdp.fill(dt) But in VS.Net, You can also right click the SQLDataAdapter1 component and click "Generating Dataset...", after specify a name, the new xsd file will be created as well as a correspond vb file. The VB file basically created another class inherit DataSet class. But in the vb code, it seems still need to do: dataApt.fill(AutoGeneratedDataset, "SameNameOfTheTableWhenGenerating") What's the benefit to use this function of VS.Net? I know one is you can use the visual tool to do data binding after you have generated dataset placed on the form designer.... Others? Tag: Nested DataRelation Tag: 87297
  - 15
    - Populating disconnected ADODB.Recordset with System.Data.DataTable data. I need to support a VB6 application that will be receiving disconnected ADODB.Recordset from out DotNet solution. Our dotnet solution deals with System.Data.DataTable. I need to populate a disconnected ADODB.Recordset from System.Data.DataTable data. Below is the source code I am implementing to test the process. I do not get any error, that I can see. The problem I have is that at the end, the recordset seems to be empty. Any suggestions are very much appreciated. At this moment I do not know what to do. Thank you so much for the time and effort you may spend on this matter. Elcc. private bool testConvertDT_RS() { System.Data.DataTable dt; ADODB.Recordset rs; // create dummy data table. dt = PopulateDataTable( ); // attempt to populate disconnected ADODB.Recordset with System.Data.DataTable data rs = ConvertToRS ( dt ); if( null == rs ) { throw new Exception(" Recordset is null."); } if( 0 == rs.Fields.Count ) { throw new Exception(" Recordset Field count is zero."); } return true; } private System.Data.DataTable PopulateDataTable() { System.Data.DataTable dt = new System.Data.DataTable(); System.Data.DataRow dr; string[,] ColValues = {{"R1-C1", "R2-C1", "R3-C1", "R4-C1", "R5-C1"} , {"R1-C2", "R2-C2", "R3-C2", "R4-C2", "R5-C2"} , {"R1-C3", "R2-C3", "R3-C3", "R4-C3", "R5-C3"}}; dt.Columns.Add(new System.Data.DataColumn("Column01", System.Type.GetType("System.String"))); dt.Columns.Add(new System.Data.DataColumn("Column02", System.Type.GetType("System.String"))); dt.Columns.Add(new System.Data.DataColumn("Column03", System.Type.GetType("System.String"))); for( int i = 0 ; i < 5 ; i++ ) { dr = dt.NewRow(); for( int n = 0 ; n < 3 ; n++ ) { dr[n] = ColValues[ n, i]; } dt.Rows.Add(dr); } return dt; } private ADODB.Recordset ConvertToRS(System.Data.DataTable dt) { ADODB.Recordset rs = new ADODB.Recordset(); try { rs.CursorLocation = ADODB.CursorLocationEnum.adUseClient; rs.ActiveConnection = null; for( int i = 0; i < dt.Columns.Count; i++) { rs.Fields.Append( dt.Columns[i].ColumnName, ADODB.DataTypeEnum.adBSTR, dt.Columns[i].MaxLength, ADODB.FieldAttributeEnum.adFldUnspecified, null ); } rs.Open( Type.Missing, Type.Missing, ADODB.CursorTypeEnum.adOpenStatic, ADODB.LockTypeEnum.adLockOptimistic, -1); foreach(System.Data.DataRow dr in dt.Rows) { rs.AddNew(Type.Missing, Type.Missing); for( int n = 0; n < dt.Columns.Count; n++) { rs.Fields[n].Value = dr[n]; } rs.Update(Type.Missing, Type.Missing); } rs.Close(); return rs; } catch(Exception e) { throw e; } } Tag: Nested DataRelation Tag: 87295
  - 16
    - concurrency questions I am using an access db via ole db from an asp.net page. When I open a connection, if there are no more connections in IIS's connection pool it'll try and open a new connection. If there are no more connections available what exception get's thrown? By the same token, when using a data adapter to do an update, what exception gets thrown if the server (the access mdb) is busy? Lastly, where can I read up on this. I already know about switching the MSDE etc. Sounds great, but not an option for the near term. Thanks ... Ed Tag: Nested DataRelation Tag: 87292
  - 17
    - Storing Date/Time with Daylight savings Dear All, I am developing an application that will save historical data; The table is very simple, it will have a Time Stamp column and other columns to save real values. The application should be able to work with several different databases. My problem now is to make a decision about the date/time to be saved in the Time Stamp; I can use either System Time (GMT) or Local Time; if I choose the first one, the users will get confused when they try to open the tables using a GUI other than mine. On the other hand, if I save using Local Time, I can have problems with Daylight saving. Does anyone have any idea about how to avoid problems with daylight saving other than saving the System Time? Note: I thought about using an additional field (maybe save both, System Time and Local Time), but I think that you experts should have a better solution. Thank you in advance, Lourenço. Tag: Nested DataRelation Tag: 87290
  - 18
    - How to handle NULL fields-error with fill method I have a data adapter that is using a stored procedure and when I get to the fill method to fill a dataset I get the following error Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints. The results of the procedure has 6 columns by 50 rows with some NULL field values throughout so think the NULLs are causing the problem. Just wondering how to handle this? Thanks Paul. Tag: Nested DataRelation Tag: 87289
  - 19
    - OracleType.NVarChar parameters handled differently in framework 1.1? There appears to have been a change in behaviour between handling of OracleType.NVarChar parameters in 1.1? In my case this breaks code using DbType.String or the IDataParameter interface with strings over 2000 characters. A 2001 character string parameter, consisting entirely of 7 bit characters, sent to a 9.2.0.1 stored procedure works under the optional 1.0 Oracle driver. The exact same code and database now falls over with "ORA-01460:unimplemented or unreasonable conversion requested" using the supplied 1.1 OracleClient.dll. This change in behavior leads me to the conclusion that the biggest string you can now pass to an Oracle database using the IDataParameter interface is now only 2000 characters, primarily because OracleClient 1.1 maps the String native type to OracleType.NVarChar with a 4000 byte limit? This 2000 char limit would be required to handle the possibility that the database *may* be configured with a 16bit NLS_NCHAR_CHARACTERSET like AL16UTF16 as is sometimes recommended by Oracle? Even though you are could actually be inserting a plain old ascii string into a plain old varchar2(4000) column on a plain old USASCII7 Oracle instance? Assuming this is the case, can anyone think of a workaround, other than 1. Having to abandon the database independent IDataParameter interface and change all the client code to discover and use whichever native <database>Type is appropriate for the connection? 2. Stick to strings of less than 2000 characters. Rich. Tag: Nested DataRelation Tag: 87288
  - 20
    - Copy data between two dataadapters Hi, we want to build an application which copies all data from the source to the destination without changing anything. We use data adapters for this process. So we open both adapters, use "fill" on the source and give an "update" to the destination. The problem is that the table we want to copy is quite large. So we see quite a memory usage. So we decided to move the data in blocks, 1000 records at a time. We use the dataadpter.fill(dataset,0,1000,tablename) to read the first records, then we do an update, then the next fill (dataadpater.fill(dataset,1001,2000,tablename) and loop that till EOF. We see that the programm moves the first records quite quickly but gets slower and slower over time. Our idea is that the dataadapter take more and more time to skip the first records of the source to get to the real "payload". Is there anything we can do better? We simply want to move the first 1000 records, then the next 1000, and so on... Thanks, Thomas Tag: Nested DataRelation Tag: 87287
  - 21
    - Help... last deleted row not updated Hi group, in a checklistbox I have some item that can occur(when checked) in a datatable. when I uncheck 3 items and press the update button a problem occurs. In the Buttonevent I make a loop where I search for still excisting unchecked(s) searching the id with dataviewtable.find(). If found the datatable.rows[found].delete() is called. I see this happen tree times in debug mode.... so far, so good.... But when I call the adapter.update(ds[table]) only the first two rows are really updated and the last one still is in the sql-server. Do I have todo something extra before calling update or has any one a solution to my problem? Thanks in advance, Rens Tag: Nested DataRelation Tag: 87286
  - 22
    - Dataset WriteXML method I have a dataset that was created from a XSD schema. I populate it with data and use WriteXml method to create XML document. Problem is XML tags come out in the order that is different from the order of tags in the XSD. My client requires that XML validates against XSD, and the use XMLSPY to validate it. I ran the same test and XMLSPY complains that tags in the wrong order. Is there a way I can force order of tags with WriteXml method of Dataset? If not what ate the other alternatives? Thank you all very much Tag: Nested DataRelation Tag: 87285
  - 23
    - DataSet/Table/Row questions Hi.. I'm trying to port an old application to .Net and I've been exploring the possibility of using the DataSet, DataTable, and DataRow classes to make an unconnected, in-memory database for a light-weight app. I can already get myself pretty much most of the way there, but there are some questions I have The data I'm trying to work with is serialized as XML and the XML has roughly this structure <Root><Client id="1" total="Sum(Child(rel).cost)" updated="Max(Child (rel).updated"><Order id="1" cost="12" updated="<date>"/><Order id="1" cost="3" updated="<date>"/ .. </Client .. </Root I have the schema to create the DataSet and the tables; it ends up with 2 tables, a parent/child relationship, and some columns in the parent table as operations on the child table For the most part this works pretty well, but there are a few things that are sub-optimal and I was wondering if there might be any suggestions to help smooth things out 1) I'd rather have it as one table, if I could, and then use a Select statement with something like a GROUP BY to create the summaries, but I don't see any easy way to do this. Also, there doesn't appear to be any xml serialization support below the DataSet level 2) Also, while we want to keep a certain amount of data in the in-memory database, we want to be able to select only particular nodes for serialization in xml (i.e. give me the xml tree structure only for nodes where Client.total > 100, for example). But the DataSet xml serialization doesn't seem to support any selection; it only serializes the whole database. Is the only way to work with this to serialize the whole thing out and suck it back into a DOM and do the selection with xpath? Seems a deficiency that the xml serialization doesn't support selection and/or there isn't any serialization support on the table level 3) Multiple part question a) how expensive is it to do a DataSet.Clone, a Select and a Merge? (i.e. a way of getting a dataset with only the data I want to return) b) Since I currently have 2 tables, I would guess I have to do separate selects on the the parent and child tables, resulting in 2 DataRow []. Is doing DataSet.Merge() going to get the row arrays into the right tables c) given a defined relationship between parent and child tables is there any way to write a select that would get both row sets in one call And generally, if anyone can give general tips on how to make this work better, I would appreciate it Thank Mark Tag: Nested DataRelation Tag: 87281
  - 24
    - Multithreading: "There is already an open DataReader associated with this Connection" Hi all I am running multiple threads retrieving information from a SQL database, using sqlDataAdapter and DataSet. I regularly (but not constantly) get an exception "There is already an open DataReader associated with this Connection" thrown. Now, I know that the sqlDataAdapter uses DataReader under the hood, and that DataReader does not accept more than one connection open at a time. How might I work around this issue? Having the threads wait for eachother by calling Join() is not an option. I need to run a large number of threads calling this function I'll add some code to (hopefully) clarify my issue. The function PollSubscriptions is called by multiple threads private void PollSubscriptions(string devicePIN) ArrayList subscriptions = new ArrayList() ArrayList events = new ArrayList() string subscriptionIDs = "" XmlDocument XmlDoc = new XmlDocument() try { sqlListenerThreadDS.Clear() sqlListenerThreadDA.SelectCommand.Parameters["@PIN"].Value = devicePIN.ToUpper() sqlListenerThreadDA.Fill(sqlListenerThreadDS) foreach (sqlListenerThreadDS.subscriptionsRow subscription in sqlListenerThreadDS.subscriptions) subscriptions.Add(subscription.subscriptionID.ToString()) sqlSubscriptionsDA.Fill(sqlUserInfoDS) foreach (string id in subscriptions) sqlUserInfoDS.subscriptionsRow subscription = sqlUserInfoDS.subscriptions.FindBysubscriptionID(Convert.ToInt32(id)) subscription.lastPoll = System.DateTime.Now.ToUniversalTime() sqlSubscriptionsDA.Update(sqlUserInfoDS) catch (Exception ex) logEntry = "Failed to poll subscriptions for device " + devicePIN.ToUpper() + ": " + ex.Message + "\n" + ex.StackTrace eventLog.WriteEntry(logEntry, EventLogEntryType.Error) } Would anyone know a solution? sqlDataAdapter and DataSet are thread-safe, aren't they much regard Eri erik.removethisifyourenobot@thesixthhouse.nl Tag: Nested DataRelation Tag: 87277
  - 25
    - connection string I apologize for such an elementary question. My connection string requires a data source. Is that the server name? The DB name is the Initial catalogue, so that isn't the data source. Thanks for the help SMK Tag: Nested DataRelation Tag: 87269

Am setting DataRelation.Nested = true, because using DataSet.WriteXml() to export and want nesting in resulting doc

Get impenetrable error message when try to turn nesting on in DataRelations, which work fine without nesting (e.g. as created in VS Designer). (Message appears when trying to add the offending data relation, not when exporting.) Looks like the rule appears to be: cannot have more than one nested data relation where parent table == A and child table == B, regardless of columns chosen in each. But I have a pair of tables where A on column A1 is parent of B on column B1 *AND* A is also parent on column A1 of B on column B2

Anyone understand why? Anything I can do about it?

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