data access

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- Previous
  - 1
    - What is "Any instance members are not guaranteed to be thread safe" ? Hello all, I was developing an ASP.NET application using c#, and I was thinking for adding some instance variables for my xyz.aspx like this :- public class SetCustomers : System.Web.UI.Page { private string s_workemail = ""; private void Page_Load(object sender, System.EventArgs e) { I however came across this in the Page Class definition :- Thread Safety Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe. so I got confused, my question is, does this mean that my instance variable s_workemail is NOT thread safe? i.e if user A and user B access my page and modify the value at the same time, will I get wrong results? or will there be 2 variables, 1 on every thread? Thanks for your help. Tag: data access Tag: 108044
  - 2
    - problem with nested relations in typed datasets hi.. i have 2 problems if i create a table relationship between 2 tables and define it as nested in the "is nested" property schema it does not create any DataRelations if i try to define a nested Relation in runtime but with a constructor it will be ignored. only using isNested Property of the date Relation will work Tag: data access Tag: 108041
  - 3
    - DataColumn.Caption I've set the Caption property for a table in DataSet, so when hte DataSet is binded to a Datagrid, the caption is displeyd instead of the column name. But it doesn't work. I get the column name instead of caption. What may be the cause? Tag: data access Tag: 108036
  - 4
    - How to use Like in free text search on Datadview.Rowfilter or DataTable.Select() Hello, I need to implement a free text search on an asp.net page. I need to search two columns based on a text entered in a tex box. it should be possible to search any subsrting included in one of the two columns. I did the following: DataView dv=MyOriginaleDataTable .DefaultView; dv.RowFilter=" column1 Like ' "+srearchstring.text +" ' or column2 Like ' "+ srearchstring.text+ " ' "; ..... MydataList.DataSource =dv. ......... This is not working. Can someone tel me what i'm doing wrong? Many thanks JB Tag: data access Tag: 108034
  - 5
    - Bug of SqlClient?! Problem with output parameter/SQL Server 2000! Here is the simple test stored procedure: <code> CREATE PROCEDURE pr_test ( @xParam1 nvarchar(200) = null output ) as --set @xParam1 = newid() select result = @xParam1 set @xParam1 = newid() </code> If I run the following test SQL script in Query Analyzer, I get expected result: declare @x nvarchar(500) <code> set @x = '1234' exec pr_test @x output select result = @x </code> <output> result -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 1234 (1 row(s) affected) after ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- 92CBE528-6097-48C6-A0C4-C152425D180A (1 row(s) affected) </output> However, in Visual Studio .NET 2002/2003, the following code does not get expected result: <code> DataSet ds = new DataSet(); this.sqlDataAdapter1.SelectCommand.Parameters["@xParam1"].Value = "1234"; this.sqlDataAdapter1.Fill(ds); this.dataGrid1.DataSource = ds.Tables[0]; this.Text = this.sqlDataAdapter1.SelectCommand.Parameters["@xParam1"].Value.ToString(); </code> The output paramter @xParam1 has been setup correctly. The datagrid always shows the value of 'result' column as 'null'. Do I have misunderstanding of ADO.NET/SqlClient or this is simply a bug? Tag: data access Tag: 108028
  - 6
    - Using Transactions in C# Hi, i have some wired behaviour using c#, ado and sql server. There are two tables on sql server: Order and Orderdetails. (Order_ID is primary key on Table Order and foreign Key on Orderdetails.) I have two c# Classes calles Order and Orderdetails. They contain two Methods for inserting Orders or Orderdetails on Database. (Parameterized with an sql connection an an transaction.) On the main programm a transaction is started an calling Order.Insert(...) Then, i do serveral Orderdetails.Insert(...) before committing the transaction. This works as supposed, but there is one big issue i cant figure out: I start debugging the app and opend query-analyzer. After calling Order.Insert(...)-but not yet committed the transaction - i am able to do a "select * from order where order_id = 1". BUT: After calling Orderdetail.Insert(...)in the code -but not yet committing the transaction- i cant do a "select * from orderdetail where order_id = 1), because Query Analyzer is waiting until the transaction is commited. Why that? I mean it did work for Order.Insert; why not for Orderdetail.Insert??? When i use the command "select * from orderdetail with (readpast) where order_id = 1" it asap returns data. (There are about 1000 Datarows in the Tables; that with order_id = 1 has been already inserted. The isolationlevel is set to IsolationLevel.ReadUncommitted) Can anyone help? Thanks, bye DS Tag: data access Tag: 108027
  - 7
    - DeriveParameters and Jet OLEDB Provider Hi I've just discovered that the Jet OLEDB Provider does not support OleDbCommandBuilder.DeriveParameters, to discover the number and type of parameters expected by a Microsoft Access query. I'm a little surprised, as it was always possible to use the ADO Refresh method with this provider to populate a Paramters collection. Is there a reason for this? Is there a workaround? I know that it's an expensive operation which should be avoided anyway, but it's sometimes useful, and I'd like to use the same code against both Access and SQL Server. Thanks in advance. -- Doug Tag: data access Tag: 108024
  - 8
    - ADO.NET 2.0 - Question for Microsoft Employees Okay, so we have a new Isolationlevel for transactions in ADO.NET - the snapshot isolation. That exists at System.Data - which leads me to believe that nothing really stops me from setting that isolation level on Oracle. So my question is - by setting that on Oracle, does it mean the same as SET TRANSACTION READ ONLY Or does Isolationlevel.Snapshot not work on Oracle? (Frankly my opinion, IsolationLevel.Snapshot not working on Oracle is not a good answer, but if that is what it does, then that is what it does ..) Can anyone advise? :) - Sahil Malik [MVP] http://codebetter.com/blogs/sahil.malik/ Tag: data access Tag: 108021
  - 9
    - Casting IntPtr/Byte etc... Trying to get HP's Biometric API for the .NetCF to work by storing fingerprint data in a DB and then retrieving it. First problem: casting to the right types to store in the DB. Right now I'm casting each fingerprint property to OleDbType.Variant prior to inserting in the DB and then in a stored procedure casting each property to either Int, Binary or smallint before storing it in a table. I get a problem when retrieving though - exceptions on pretty much each data type. System.UInt32 Length; System.Byte HeaderVersion; BioAPI_BIR_DATA_TYPE Type; System.UInt16 FormatOwner; System.UInt16 FormatID; SYstem.Byte Quality; BioAPI_BIR_PURPOSE Purpose; BioAPI_BIR_AUTH_FACTORS FactorsMask; System.IntPtr BiometricData; System.IntPtr Signature; The 3 custom datatypes are either of type UInt8 or type UInt32. I'm even having problems with re-casting (i.e. after retrieving info back from the DB) type Byte (ex: HeaderVersion, "An unhandled exception of type 'System.InvalidCastException' occured"). Could anyone point me out as to what I should do. And also how I can cast, or import, data that has type System.IntPtr. Thanks so much! Tag: data access Tag: 108019
  - 10
    - Datarepeater Hi, NG! Is there any updated version (.Net) of the Datarepeater control or do I have to use the old (VS6.0) version? Thanks. pax Tag: data access Tag: 108014
  - 11
    - Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraint We've moved a database from one SQL server to another using a backup and restore, we had some problems because the location was slightly different when we moved the database, then we had to create all the users again. We're now receiving an error when opening the client utility - which is "Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraint" Any suggestions? database was working beforehand so i can't see why it would be an error in the code Regards Paul PS SQL2000 with SP3 Tag: data access Tag: 108004
  - 12
    - ExecuteNonQuery returns ORA-01036 illegal variable name/number I have used ExecuteNonQuery with no trouble for inserts, updates and deletes. The best practices book I have says this is also the most efficient way to return multiple column values from a single row. The requested fields can be changed by users adding/removing fields from the form, so a stored proc will not work - variable number of return values. I tried: Select name, rank into ( :V1, :V2 ) from mytable where keyvalue = :V3 and get ORA-01036. The bound parameters are named to match the sql statement. IN params work fine, but I cannot make it happy with the OUT params. Any help would be appreciated. Tag: data access Tag: 108002
  - 13
    - how to connect Access database I was using the following classes to get data from. Now I would like to know which class shall I use from Windows Forms VC++ 2005. CDaoDatabase m_Dao; // Variables in String Table // m_file = "C:\\Program Files\\Onair\\InVer.mdb" // m_upass = "password" m_Dao.Open(m_file ,FALSE, FALSE, m_upass); CDaoRecordset m_Set; COleVariant m_varprofile; COleVariant m_varsection; m_Set.GetFieldValue ("Profile", m_varprofile); etc.., Tag: data access Tag: 108001
  - 14
    - Case-sensitivity in a stored procedure Hi there! How can I toggle case-sensitivity within a stored procedure? I'd like to compare 2 passed in parameters against fields in a table. The first comparison is case-sensitive, the second is not. How can I do that? By default it seems they're not case-sensitive. Thanks in advance. -- /Matthias Tag: data access Tag: 107999
  - 15
    - To Insert Multiple Rows in Oracle using oledbCommand I need to know how to Insert Multiple Rows in Oracle using oledbCommand -------------------------------- From: Mose Joseph ----------------------- Posted by a user from .NET 247 (http://www.dotnet247.com/) <Id>wLuDr7c3DU+/lMo6w74RrQ==</Id> Tag: data access Tag: 107991
  - 16
    - (Q for David Sceppa!) Problems submitting hierarchical changes to DB Hello, On page 786 of the ADO.NET Core Reference (chapter 11 - Advanced Updating Scenarios), David Sceppa gives the basic steps for submitting hierarchical changes (paraphrased): 1. Submit new master rows 2. Submit new detail rows 3. Submit modified master rows 4. Submit modified detail rows 5. Submit deleted detail rows 6. Submit deleted master rows I took this process and applied it to a rather large, normalized data structure. However, the modified detail row changes would never make it to the database. I stepped through the code and found that after updating the modified master rows (step 3), the related detail rows' RowState would change from Modified to Unchanged. This, of course, keeps the detail rows from being sent to the database. After swapping steps 3 and 4, the database was successfully updated. My questions...why does that happen in the first place? Will swapping steps 3 and 4 have some other adverse effect? Thank you! Eric Tag: data access Tag: 107989
  - 17
    - Get the name of the primary key Working with a Microsoft Access database, what is the best way to get the name of the primary key field? I know the table name. Tag: data access Tag: 107988
  - 18
    - Parameter expected? It keeps saying the stored procedure expects the parameter '@entity' which was not suppplied, but I'm supplying it: OdbcConnection cn = new OdbcConnection(CNSTR); OdbcCommand cmd = new OdbcCommand("GetMyList", cn); cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.Add("@entity", OdbcType.VarChar, 4); cmd.Parameters.Add("@type", OdbcType.VarChar, 4); cmd.Parameters["@entity"].Value = "PRAC"; cmd.Parameters["@type"].Value = "TYPE"; cn.Open(); OdbcDataReader reader = cmd.ExecuteReader(); cn.Close(); If I substitute a SQL statement (no parameters) all is good. What I am I doing wrong on the parameter creation/adding? Thanks in advance. Tag: data access Tag: 107986
  - 19
    - Generic error in GDI+ I'm loading thousands of images into a SQL Server 2000 database. I have a .NET windows application that I'm working on written in C# that retrieves the fileinfo of the directory and then loads all of the images into an image field in the database. The problem I'm having is that I get an unhandled exception after loading about 900 images that says "A generic error occured in GDI+". I've determined that it has something to do with loading the images. If I do everything but actually retrieve and load the images it runs fine. Here is the code that retrieves and loads the images to the database: string strSQL = @"INSERT INTO page(page_image) VALUES (@page_image)"; SqlCommand sqlCommand_page = new SqlCommand(strSQL, sqlConnection_DocImage); SqlParameterCollection pc_page = sqlCommand_page.Parameters; pc_page.Add(new System.Data.SqlClient.SqlParameter("@page_image", System.Data.SqlDbType.VarBinary, 2147483647, "page_image")); Image img; sqlConnection_DocImage.Open(); foreach(FileInfo row in jpgFileInfo) { using(MemoryStream imageMS = new MemoryStream()) { img = Image.FromFile(row["fullname"].ToString()); img.Save(imageMS, ImageFormat.Jpeg); pc_page["@page_image"].Value = imageMS.ToArray(); } sqlCommand_page.ExecuteNonQuery(); } sqlConnection_DocImage.Close(); The error message gives me no clue to diagnose what's happening. It sounds like a resource isn't being disposed of. Thanks in advance for any help. HArlan Marshall Tag: data access Tag: 107983
  - 20
    - Errors connecting with Microsoft.Jet.OLEDB.4.0 Hi, I install Crystal Reports 8, and some permissions for the= registry subkeys and their lower-level subkeys are modified=2E I= used a Crystal restoration utility, and everything come back= fine again, all except for the OLEDB connections using= Microsoft=2EJet=2EOLEDB=2E4=2E0 provider, I can't connect to excel files anymore, I guess is= something about the registry subkeys=2E Thanks=2E -------------------------------- From: Javier Villarreal ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>scAM4u3dcUKg/FQYxOGZeQ=3D=3D</Id> Tag: data access Tag: 107980
  - 21
    - VB.Net Joining Paradox and SQL Server Table? Has anyone done this yet? I know it is easily done in Paradox, but I would like to do it in VB.Net. Can anyone point me in the right direction? Thanks, Rog Tag: data access Tag: 107972
  - 22
    - dataadapter and component I'm creating a component that contains a function. This function is to return a data set of state values (AL,IL,TN,CA,...). I'm new to dataadapters this is my first, but something just doesn't seem right. the function return a dataset, but do it need to define a dataset in the body of the function as well as in the calling routine? 2. can i bind this dataset to two different drop down lists? here is my function. Public Class states Inherits System.ComponentModel.Component Public Function GetStates() As DataSet Dim ddlStates As DataSet = New DataSet Dim strcon As String = "DSN=SE;" Dim conSE As New OdbcConnection(strcon) Dim strSQL As String = "select staStateName, staLongName from sta where 1=1 order by staStateName" Dim daStates As OdbcDataAdapter daStates = New OdbcDataAdapter(strSQL, conSE) 'Fill dataset conSE.Open() daStates.Fill(ddlStates, "states") conSE.Close() Return ddlStates End Function Tag: data access Tag: 107970
  - 23
    - Filter Dataset Correct me if I'm wrong, but once I have my data returned from a stored procedure, in a dataset and displayed in a DataGrid (ASP.Net)...I can filter the data correct, without making a return trip to the server? Anyone have an example of how this works? Thanks Tag: data access Tag: 107962
  - 24
    - No cursor when compared with ADO After a dataset has been populated, it no longer reflects changes in database. It is the shortcoming I found in ADO.NET. In ADO, we have dynamic recordset, keyset recordset which can reflect the changes to database done by other users immediately. Why can't I find these useful stuff in ADO.NET? Tag: data access Tag: 107961
  - 25
    - Memory leak in OleDbCommand.ExecuteNonQuery()? Maybe there's something I'm doing wrong here. I'm open to any suggestions. I'll see if I can explain this clearly... I have a C# application that runs 24x7 collecting data from some source and storing the data in a Microsoft Access database. The problem is, every time it stores the data using a call to OleDbCommand.ExecuteNonQuery(), the applications memory usage grows. After a few days, the application has consumed most of the systems' virtual memory and grows more and more sluggish and unresponsive. The only solution right now is to restart the application every couple of days. Since the app uses one database and stores the same database fields with only the data changing, I set up everything at the start of the program. After that, as data comes in, only the stored data parameter values change. The first thing I do is open the MS Access database using an OleDbConnection with a Microsoft.Jet.OLEDB.4.0 provider. I then create a OleDbCommand with a command string that basically consists of "INSERT INTO table (field1, field2...) VALUES (?,?...)". Next I use OleDbCommand.Parameters.Add to add OleDbParameter data parameters that correspond to each field to the OleDbCommand, with the proper datatype for each field. Lastly I set the OleDbConnection in the OleDbCommand. As the data is collected I go through each OleDbParameter and set its Value to either the data collected or DBNull.Value if the data is missing. Then I call OleDbCommand.ExecuteNonQuery to actually store the data. That occurs successfully, but the virtual memory alllocation goes up and up each time the data is stored. I monitor the memory usage with Sysinternals ProcExp, and if I comment out the call to actually store the data, the memory usage remains constant. So am I doing something wrong, or is there a memory leak in OleDbCommand.ExecuteNonQuery? Tag: data access Tag: 107957
- Next
  - 1
    - SQLConnection connection pool issue I have a similar problem to several other people who have posted= here - I can only open up to <Max Pool Size> connections=2E After= that I get a timeout expired exception=2E Looking at the open / pooled connections in perfmon (in both SQL= Server stats, and the CLR runtime), there are never more than 5= / 6 connections open, but without fail, I cannot open more than= <Max Pool Size> connections, even when I change this value or= don't specify it=2E I have already tried several suggested solutions - disabling SQL= Server debugging in VS=2Enet, running in release mode, connecting= to several other databases on several other computers, but= nothing seems to have any effect=2E I have gone through the code= with a fine tooth-comb, and put "open connection" counters into= my database class (all the connections are opened and closed by= a single pair of shared functions - and yes, the connection= object is passed by ref=2E), and ensured that the connections are= actually reporting they are closed (via SqlConnection=2EState)= both inside and outside the function that closes them=2E I'm all out of ideas now=2E Any suggestions would be greatly= appreciated=2E -------------------------------- From: Rory Smith ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>gdTZqEcYx0eoUbAQReEUNQ=3D=3D</Id> Tag: data access Tag: 107956
  - 2
    - XML Schema (XSD) and ADO.net DataSet - limitations mapping between them The following valid XSD schema can NOT be successfully read by the ReadXMLSchema method of the DataSet object - it errors out with a "NonEmptyString not defined" error. This schema is more complex than a plain vanilla schema, but doesn't strike me as obscenely complex. Are there general rules for what can an can not be mapped between any XSD schema & a .net DataSet? Thanks <?xml version="1.0" encoding="UTF-8" standalone="yes"?> -- edited with XMLSpy v2005 rel. 3 U (http://www.altova.com) by Wheels Inc (Wheels Inc) -->  <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified"> <xs:element name="CollisionTemplateA1"> <xs:complexType> <xs:sequence> <xs:element ref="FullName"/> <xs:element ref="Hometown"/> <xs:element ref="Province"/> </xs:sequence> </xs:complexType> </xs:element> <xs:element name="FullName"> <xs:complexType> <xs:simpleContent> <xs:extension base="NonEmptyString"> <xs:attribute name="from" fixed="/LR/Deeper/IsDriverInsane"/> <xs:attribute name="conditional" fixed="yes"/> <xs:attribute name="source1" fixed="/LR/Deeper/Name"/> <xs:attribute name="source2" fixed="/LR/Name"/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> <xs:element name="Hometown"> <xs:complexType> <xs:simpleContent> <xs:extension base="NonEmptyString"> <xs:attribute name="from" type="xs:string" fixed="/LR/City"/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> <xs:element name="Province"> <xs:complexType> <xs:simpleContent> <xs:extension base="NonEmptyString"> <xs:attribute name="from" type="xs:string" fixed="/LR/State"/> </xs:extension> </xs:simpleContent> </xs:complexType> </xs:element> <xs:simpleType name="NonEmptyString"> <xs:restriction base="xs:string"> <xs:minLength value="1"/> </xs:restriction> </xs:simpleType> </xs:schema> Tag: data access Tag: 107953
  - 3
    - Extracting enum from table Hi, I'm reading the result of a query using MySqlDataReader. I'd like to extract information about the row datatypes that are returned. For example, myDataReader.GetFieldType(1).TosTring() will easily return values such as "System.UInt32" or "System.Byte". My problem is that i'd like to retrieve information about enum types. My datatype in the MySQL db is defined as: ENUM('red','blue','orange') but the above code will return "System.String". I'm interested in retrieving something that will give me all valid input types for an enum field in the database. I've also tried looking at the System.Data.DataTable object but didn't find any clues on how to solve this. Any help is greatly appreciated. -------------------------------- From: Morten Skov ----------------------- Posted by a user from .NET 247 (http://www.dotnet247.com/) <Id>ltesbJ0arEScu0cv8VUUKQ==</Id> Tag: data access Tag: 107952
  - 4
    - Broken Web Links Within Microsoft Access I have built a database in Microsoft Access 2003 that has a number of links that go out to the web. Does anyone know of a way I could set up my database to check which links are active and which ones are inactive? Because the links are added and removed, I would need to run this once a day, so any automation would be nice. While researching this, I came across (is broken) and (ConectionState) am I on the right track. Thank you for any help Corey -- Message posted via http://www.dotnetmonster.com Tag: data access Tag: 107951
  - 5
    - Dataset: expression columns recalculation Hi there I'm having a typed dataset, where a datatable has some columns which are expressions. After doing a Merge, i was expected that my expression columns were calculated, but they were not. Although, if i do this foreach(System.Data.DataColumn column in dataset.myDataTable.Columns) { if (column.Expression!=null && column.Expression.Length>0) column.Expression =column.Expression; } they are calculated... is this by design ? thanks! www.dotnetx.org Tag: data access Tag: 107949
  - 6
    - C# and ADO.Net - Cheap Question! Hi, I'd like to INSERT a string into a database using C#. The way I've tried it is the following: sQuery = string.Format("INSERT INTO myTable (Header, Body) VALUES ('{0}','{1}')", sHeader, sBody); It works fine until I have an occurence of ' (an apostrophy) in either the string-variables sHeader or sBody. How can I circumvent this? Thanks in advance! -- /Matthias Tag: data access Tag: 107932
  - 7
    - Problem with RowChanged event and bindingcontext Hello all, IÂ´m experiencing a problem ( maybe a bug ...), with the rowchanged event. When i change the position in a table after alter a field the datarowchanged event starts only if the navigation path of the databinding is not a relationship: Ej... ds.Tables["house"].RowChanged +=...; texto.DataBindings.Add("Text", "house.doors"); this.BindingContext(ds,"house").Position++; in this case the event starts correctly Ej... ds.Tables["requirements"]..RowChanged +=...; // requirements is the relations between "house" and "requirements" tables texto.DataBindings.Add("Text", "house.requirements.pay"); this.BindingContext(ds,"house").Position++; in this case the event doesnt starts, but the DataRow of the relation table is altered. Does anyone know something about this? is a bug? it is its normal way of working? Greetings and excuse my poor english Tag: data access Tag: 107927
  - 8
    - sqlcommand parameters with null Is there an easier \ shorter way of doing this? If txtreason.Text = "" Then NoteCmd.Parameters.Add("@reason", SqlDbType.VarChar, 100).Value = vbNull Else NoteCmd.Parameters.Add("@reason", SqlDbType.VarChar, 100).Value = txtreason.Text End If thanks gv Tag: data access Tag: 107926
  - 9
    - Strange slow down with imbricated DataReader (Oracle, c#) This is my first c# windows app. I create a data reader on an Oracle table. Returns 552 rows. I iterate thru them, goes like light speed. Next, for each row returned, I need to fetch from another table to get some other information. When I do that, my program takes 20s instead of 1s. I even downgraded my inner SQL to become "select 1 from dual", same performance hit! Is there a problem with Oracle under c# using two DataReader at the same time? Here's the code: con = new System.Data.OracleClient.OracleConnection(); con.ConnectionString = "user id=xx;data source=xx;password=xx"; public void Process(ProgressBar progBar) { OracleDataReader dr; OracleCommand cmd; dr = GetMainDR() while (dr.Read()) { // get some columns ... cmd = new OracleCommand("select 1 from dual", con); Decimal i = (Decimal) cmd.ExecuteScalar(); <----- slows down everything cmd.Dispose(); ... } } public OracleDataReader GetMainDR() { OracleDataReader dr; OracleCommand cmd; cmd = new OracleCommand("select * from TABLE_OF_552_ROWS", con); // change dr = cmd.ExecuteReader(); return dr; } Tag: data access Tag: 107924
  - 10
    - first chance exception of type 'System.Data.SqlClient.SqlException' occurred in system.data.dll Hi all, I thought I would help out on a Error that comes up for a lot of people when calling a stored procedure from your application using sqlcommand object and passing parameters. this error comes up in VB.NET "first chance exception of type 'System.Data.SqlClient.SqlException' occurred in system.data.dll" this took me awhile but figured it out. Make sure in the stored procedure you declare the variable like this for variables that might not have any data: Make it equal nothing or null @mainnotes TEXT = '', or @mainnotes TEXT = null This fixed my problem, and I'm sure there are more solutions but, I hope this helps. The error could also come up if SQL permissions are not correct. Gerry Tag: data access Tag: 107923
  - 11
    - Architecture: One Producer, Many Consumers Hi all, This sounded like a really easy R&D challenge but .NET is leaving me with too many options and I don't have six months to experiment and find the best one. Hence I would like to lean on this board's expertise. Environment is C#/.NET/SQLServer2k/VisStudio .NET. I have several remote applications that are delivering data to a central server. This server process is archiving the data in an SQL 2000 db. Now I also have one to about a dozen fixed clients on a WAN, which need to be notified when a change takes place to the central database so they can update their UI to reflect the changes. What is everyone's suggestion for doing this? Any resources out there you can point me at? I've run the gamut from remoting, to serialising the DataSets (which scares me due to the amount of data that may start going over the channel), to considering whether the remote clients should be writing directly to the db (although bandwidth limitations tend to prohibit TCP-like connections), to wondering why there doesn't seem to be any way for a client to simply connect to an SQL database and be told when changes occur... and so on. Is there something I've missed? This seems like a straightforward client-server requirement. Any help gratefully appreciated, and thanks in advance. Neil B Tag: data access Tag: 107919
  - 12
    - Trouble with creating DataRelations - Need Help I am building an App that takes an Excel file and populates 3 DataTable's in a Dataset. I then was to create a relationship between these 3 DataTables. After dong so I want to run some code to process / modify the data in the tables and then return the result back into an Excel file. I am a beginner at VB and i chose this as a starter project. I get the following exception when i try to create the DataRelation: An unhandled exception of type 'System.ArgumentNullException' occurred in system.data.dll Additional information: 'column' argument cannot be null. Am i coding this correctly? When i run the fill command, will the table automatically pick the column header and other schema info? Once this is done I would like to create some DataRelationships between the three tables. Will there be an error because the table schema was not detected? I am curious about the concepts themselves rather than my code. I have already tried to read up on all the info online, but nothing addresses my situation. Listed below is the code I have. All help would be appreciated Thank You Private Sub cbConvert_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cbConvert.Click 'Convert button click event Dim filename As String filename = tbInputFileBrowser.Text() Dim XLFileConn As New OleDbConnection XLFileConn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & filename & _ ";Extended Properties=""Excel 8.0;HDR=YES""" Try XLFileConn.Open() Dim XLFileCmd1 As New OleDbCommand XLFileCmd1.Connection = XLFileConn Dim XLFileDA As OleDbDataAdapter = New OleDbDataAdapter XLFileDA.SelectCommand = XLFileCmd1 Dim XLFileMainDS = New DataSet("MainDataSet") Dim TableMain As DataTable = XLFileMainDS.Tables.Add("TableWithMain") XLFileCmd1.CommandText = "SELECT * FROM [Sheet1$] WHERE Modify <> 'TC' OR '26'" XLFileDA.Fill(XLFileMainDS, "Sheet1") Dim TableTC As DataTable = XLFileMainDS.Tables.Add("TableWithModTC") XLFileCmd1.CommandText = "SELECT * FROM [Sheet1$] WHERE Modify = 'TC'" XLFileDA.Fill(XLFileMainDS, "Sheet1") Dim Table26 As DataTable = XLFileMainDS.Tables.Add("TableWithMod26") XLFileCmd1.CommandText = "SELECT * FROM [Sheet1$] WHERE Modify = '26'" XLFileDA.Fill(XLFileMainDS, "Sheet1") 'XLFileDA.FillSchema(XLFileMainDS, SchemaType.Source, "Sheet1$") Dim ParentCol As DataColumn Dim Child1Col As DataColumn Dim Child2Col As DataColumn ParentCol = XLFileMainDS.Tables("TableWithMain").Columns("Proc Code") Child1Col = XLFileMainDS.Tables("TableWithModTC").Columns("Proc Code") Child2Col = XLFileMainDS.Tables("TableWithMod26").Columns("Proc Code") Dim RelProcCode As DataRelation Dim RelProcCode1 As DataRelation RelProcCode = New DataRelation("ProcCodeTC", ParentCol, Child1Col) 'Get an Exception Here RelProcCode1 = New DataRelation("ProcCode26", ParentCol, Child2Col) 'Add the relation to the DataSet. XLFileMainDS.Relations.Add(RelProcCode) XLFileMainDS.Relations.Add(RelProcCode1) Finally XLFileConn.Close() End Try Tag: data access Tag: 107916
  - 13
    - DataTable.Row[i].EndEdit() Hi, How can I know which row is currently being editing when I have some controls bound to a DataSet.DataTable in order to call the EndEdit method prior to update data to the database? Is there any CurrentRecord indexer? When I call Rows.Add metod, the row I am adding will be put at the end? Sorry for these stupid questions but I am newer on .net and ado. Thanks Antonio Tag: data access Tag: 107915
  - 14
    - Decimals truncated in dataset I'm airly new to .net and I can't seem to figure out this problem, I hope you can help... I'm filling a dataset from an Access database with columns of type = Decimal. When I load a datagrid with the dataset, the numbers are truncated, i.e. in Access I see 0.87224505043, in my datagrid i see 0. Why is this happening? Tag: data access Tag: 107914
  - 15
    - closing connection not by design Hi, i wanted to get this groups opinions on a design issue ive run into: a programmer has coded a common data access class which is supposed to be inherited by all data access layers at my firm. This class instantiates a connection in the constructor, relies heavily on OleDb objects by necessity, and does stuff like returns DataReaders and creates DataSets and Command objects. Before using this class i looked thru the methods and noticed that there is no exception handling, so whenever error occurs, open connections and OleDb DataReaders and command objects never get closed/disposed. Being a helpful fool, i suggested to this programmer that it would be good idea to ensure that these methods clean up unmanaged resources that they create per best practice. The response i got is that "you dont understand the design", this decision was intentional... all code that calls this classes methods must write their own code to cleanup these resources in event of an error. He did not want to "restrict users of the class from flexibility in how they handle errors". Given that: 1. No other programmers who use this class were aware of this necessity 2. the programmer who wrote this class himself never checks for errors from code that calls these methods 3. its not possible for others to cleanup resources created within those methods 4. you can still pass exceptions to the caller and still dispose resources you create. 5. there are numerous problems with applications in production which use this data access class. my impression is that instead of accepting that a (fairly common) mistake/oversight was made and quickly taking basic steps to correct it, this programmer has decided to defend the indefensible. What do you think? Premier JiangZemin Tag: data access Tag: 107901
  - 16
    - Vb.net ADO connecting SQL Server and Paradox table to create a query. All, I want to run a query in my vb.net application that will join a table in Paradox and a SQL Server table? The paradox table will be dynamic, meaning based on user input I may point to different folders but same file to get data. Thanks, Roger Tag: data access Tag: 107900
  - 17
    - How does ADO.NET handle transactions when the connection is broken Hi, We are thinking of using ADO.NET to implement transactions on our SqlConnections, but would like to know how ADO.NET and SqlServer handle the situation when the connection gets broken. We have a client application in one location and a SqlServer DB in another location. We have tested the commit and rollback actions on a good connection and everything works great! When the connection gets dropped after the BeginTransaction method gets called however SqlServer seems to take a while before realising the connection has been dropped and rolling back the transaction (5 minutes). This means that the records updated inside the transaction before the connection was dropped remain locked for 5 minutes before being rolled back. Is there any way we can configure or control the timeout period? Here is a basic code snippet: try { db.OpenConnectionAndBeginTransaction(); db.ExecuteSomeSQL(); db.CommitTransaction(); } catch(Exception) { db.RollbackTransaction(); throw; } Any help would be greatly appreciated. Thanks, Rob Tag: data access Tag: 107889
  - 18
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Tag: data access Tag: 107888
  - 19
    - Datatable.Select method - Difference Between %AE% and *AE* Hi, Keyvalue :AETHAE Keyvalue : AETH The problem is that I am using the Datatable .select method and Filter expression is %AE%.This Pattern is searchs only mid string not with starting point. Output: AETHAE IF i use the *AE* , then searches from the starting point Output: AETHAE and AETH Pls. clarify... Thanks Palani Tag: data access Tag: 107885
  - 20
    - How to synchronize Dataset to database In our project we fetched data into dataset from the database. Now we are storing the data in a XML File from the dataset. The modified DataSet is kept in the XML File And dataset is closed. Later at the time of saving we are building the dataset from the XML file and then want to save the dataset into database. We are not able to save the dataset being populated from an xml file into database. Kindly suggest a remedy for our problem Thanks in advance Regards Arnab Tag: data access Tag: 107884
  - 21
    - DataSet and Table join Is there a way to join DataTables, kind of like how you do join in SQL? Tag: data access Tag: 107878
  - 22
    - Having problem with SQLConnection.ChangeDatabase() method. I have multiple databases in which I want to traverse. Each database is secured using Applicaiton Roles. I use the SQLConnection object to connect to the first database. I run the sp_setapprole procedure and I can access the tables with no problem. However, when I try to call the ChangeDatabase method on my connection object, I get an exception thrown stating that my application role user is not a valid user in the database. If I connect to the same database using Open, it works fine. I don't quite understand what is going on here. Can anyone help? -- ----------------------------------- Ken Varn Senior Software Engineer Diebold Inc. EmailID = varnk Domain = Diebold.com ----------------------------------- Tag: data access Tag: 107873
  - 23
    - DataTable Select method I want to know what kind of queries can i execute on datatable select method. The one i am interested in is between query for eg:- this is my sample query Select max(resultan) from TblseasResult Where SeasId='15.3.13.3302005' And Countno between 4801 and 4806 where Countno is numerical field now this is what i want to do DataTable1.select("Countno between 4801 and 4806") so it should return all the rows as Datarow array Thanks -------------------------------- From: Mandar Patankar MCP ----------------------- Posted by a user from .NET 247 (http://www.dotnet247.com/) <Id>yuriN1lzc0ydMcoRYJ+RYw==</Id> Tag: data access Tag: 107871
  - 24
    - Problems inserting data into Access database Hi, I'm trying to insert new rows into a table in an Access database. Here's my code: Dim cn As OleDbConnection Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load cn = New OleDbConnection(ConfigurationSettings.AppSettings("cnstr")) Dim TStart, TEnd As Date Dim duration As TimeSpan TStart = Now() Dim table as DataTable = GetData() TEnd = Now() duration = TEnd.Subtract(TStart) Label1.Text = tbl.Rows.Count Label2.Text = "Operation took " & Round(duration.TotalSeconds, 0) & " seconds to execute." End Sub Private Function GetData() As DataTable Dim AWS As New EEC.BookStore.Books() Dim tbl As DataTable = MakeTable() Dim books As EEC.BookResponse Dim i As Integer For i = 1 To 10 'would be to the max number of pages available 'Call the web service and format data as desired; this works Call Me.AddToTable(books)'custom function that adds rows to the table Next cn.Open() Call Me.SubmitInsertViaAdapter() cn.Close() AWS = Nothing Return tbl End Function Private Function MakeTable() As DataTable Dim tbl As New DataTable("Books") Dim col As DataColumn With tbl col = .Columns.Add("ISBN", GetType(String)) col = .Columns.Add("Title", GetType(String)) col = .Columns.Add("Category", GetType(String)) col = .Columns.Add("Authors", GetType(String)) col = .Columns.Add("SImg", GetType(String)) col = .Columns.Add("MImg", GetType(String)) col = .Columns.Add("LImg", GetType(String)) col = .Columns.Add("Pub", GetType(String)) col = .Columns.Add("PubDate", GetType(String)) col = .Columns.Add("Binding", GetType(String)) col = .Columns.Add("NumItems", GetType(String)) col = .Columns.Add("NumPages", GetType(String)) col = .Columns.Add("EAN", GetType(String)) col = .Columns.Add("Keywords", GetType(String)) End With Return tbl End Function Private Function UpdateTable() As OleDbCommand Dim str As String str = "INSERT INTO Books (ISBN, Title, Category, Authors, SImg, MImg, LImg, Pub, PubDate, Binding, NumItems, NumPages, EAN, Keywords) VALUES ([?], [?], [?], [?], [?], [?], [?], [?], [?], [?], [?], [?], [?],[?])" Dim cmd As New OleDbCommand(str, cn) cmd.CommandType = CommandType.StoredProcedure Dim col As DataColumn For Each col In tbl.Columns Dim param As New OleDbParameter(col.ColumnName, OleDbType.VarChar, 255, col.ColumnName) cmd.Parameters.Add(param) Next Return cmd End Function Private Sub SubmitInsertViaAdapter() Dim daBooks As New OleDbDataAdapter() daBooks.ContinueUpdateOnError = True 'daBooks.SelectCommand = Nothing 'daBooks.UpdateCommand = Nothing 'daBooks.DeleteCommand = Nothing daBooks.InsertCommand = UpdateTable() Label3.Text = CStr(daBooks.Update(tbl)) End Sub When all is done, there are rows in the datatable but none of them were submitted to the database. What am I doing wrong? Please help, I have only a few hairs left on my head!! Thanks, Roshawn Tag: data access Tag: 107866
  - 25
    - Can't find stored procedure On Sql Server 2000, my program can't seem to find the Stored Procedure: AddNewResumeTemplate. The error it shows is: Could not find stored procedure 'AddNewResumeTemplate '1234',1001,'This is a test','This is our resume',5'. The problem is that it is there. I even have Sql Profiler running which shows it trying to execute: exec AddNewResumeTemplate '1234',1001,'This is a test','This is our resume',5 Which is correct and when I copy and paste it into Sql Query Analyser, it works. My code is the same as I have been running for a long time, so I can't seem to see what is missing. Here is what it looks like: ********************************************************************************* Dim ConnectionString as String =System.Configuration.ConfigurationSettings.AppSettings("MM_CONNECTION_STRING_ftsolutions") Dim objConn as New SqlConnection (ConnectionString) Dim CommandText as String = "AddNewResumeTemplate '1234',1001,'This is a test','This is our resume',5" Dim objCmd as New SqlCommand(CommandText,objConn) objCmd.CommandType = 4 trace.warn("objConn.ConnectionString = " & objConn.ConnectionString) objConn.Open() objCmd.ExecuteNonQuery ************************************************************************************* The trace.warn shows that it is accessing the correct database on the server, so I don't know why it can't find it. Tom Tag: data access Tag: 107862

Hi all,
I am trying to gather records from different databases into one dataset. I
can do the select statements and get the data into the datatables and then
into a dataset. The problem is then being able to get the data I need from
the dataset so that I can display it for a report. (I am trying to do a
select on the dataset tables) My question is, am I going about this in the
right manner or am I going down the wrong path. From everything I have seen
and read, a dataset query is not possible.
Can anyone steer me in the right direction? Any help or advice would be
appreciated.
Joe Hassan

Top

Re: data access by Alex

Alex
Mon Apr 04 10:50:24 CDT 2005

You can change the DataTable default view and perform some filtering on your
rows:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemdatadatatableclassdefaultviewtopic.asp

I don't believe this will work on the entire set but if you are merging data
from different sources onto the same table and same structure you can filter
it from a single point, or filter on as many tables as you have.

Alex

"joe hassan" <joehassan@discussions.microsoft.com> wrote in message
news:F616AD93-9287-4E8A-B51F-E463912E8029@microsoft.com...
> Hi all,
> I am trying to gather records from different databases into one dataset. I
> can do the select statements and get the data into the datatables and then
> into a dataset. The problem is then being able to get the data I need from
> the dataset so that I can display it for a report. (I am trying to do a
> select on the dataset tables) My question is, am I going about this in
> the
> right manner or am I going down the wrong path. From everything I have
> seen
> and read, a dataset query is not possible.
> Can anyone steer me in the right direction? Any help or advice would be
> appreciated.
> Joe Hassan

Top