I'm trying out this ORM & new to this. I have following code:
IObjectScope scope = Database.Get("MyConnection").GetObjectScope();
try
{
scope.Transaction.Begin();
Reading r = new Reading();
r.ReadingURL = reading.ReadingURL;
r.IsActive = true;
scope.Add(r);
scope.Transaction.Commit();
}
finally
{
scope.Dispose();
}
When I run this I get following error on "Add":
Telerik.OpenAccess.Exceptions.InvalidOperationException: Class
'WritingChallenge.Reading' is persistent but not known in this
context.
It seems for some reason database connection is lost? I'm not sure what is the issue here.
The issue here is that the model that was connected to the WritingReplacementConnection was having no information about the WritingChallenge.Reading type.
Did you specify a mappingConfiguration that included this type?
You can also ask this kind of questions in the forums at Telerik Forums - .NET ORM.
Related
I´m developing a data-extraction tool that gets data out of DynamicsCrm.
I have a few tables tough where i get the following exception:
Additional information: The 'RetrieveMultiple' method does not support entities of type 'mailboxstatistics'.
Reading online, using fetchxml is supposed to be the solution.
For me, it looks like i´m already using fetchxml.
My code:
private static EntityCollection RequestEntityCollection(String FetchXML, Microsoft.Xrm.Client.CrmConnection c)
{
using (OrganizationService service = new OrganizationService(c))
{
EntityCollection r = service.RetrieveMultiple(new FetchExpression(FetchXML));
return r;
}
}
I´m currently using the CRM2013 SDK so EntityCollection is from the Microsoft.Xrm.Client.dll in v6.0.0.0.
Also the documentation is using the RetrieveMultiple method.
Do you have some suggestions or is this not supported and the online suggestions are misleading?
Thank you!
The message is a bit misleading.
You get that error with MailboxStatistics because the entity is for internal use only.
I am struggling with SQL Server CE 4.0 almost all day. I get this error when I try to save new record (entity) to my database.
First a little preview - I installed SQL Server CE 4.0 via NuGet and I created a database for my project. Then I created the Entity Framework model layer and started working with that.
When I get this error my inner exception says this :
The column cannot be modified. [ Column name = Id ]
I did a little research and find out that this may be cause because of my settings for the Id property so I changed it like that :
I already have 17 records that I have inserted manually for testing purposes but I doubt this may cause any problem.
So what I try to do is this:
public override void Save()
{
using (RalBaseEntities ctx = new RalBaseEntities())
{
System.Data.Entity.DbSet<MainInfo> mainInfoEntity = ctx.Set<MainInfo>();
MainInfo entity = new MainInfo();
entity.Manager = txtManager.Text;
entity.Broker = txtBroker.Text;
mainInfoEntity.Add(entity);
ctx.SaveChanges();
}
}
So when I try to execute the Save() method I get the error above. I wrote that in previous versions one should have to create the id manually, but it's fixed in v. 4.0 and judging by the settings that I show as an image here I don't see a reason just to get a new record with an auto generated unique Id.
The word Update in DbUpdate Exception that I get is worrying me a bit. Maybe I'm trying to save the data in a wrong way but I spend a lot of time googling and it seems to be the right way.
I've searched all over and I now have to ask SO. I'm trying to construct a simple dataflow using EzAPI. It's been anything but easy, but I'm committed to figuring this out. What I can't figure out is how to get the EzOleDBDestination working. Here's my complete code
var a = new Application();
// using a template since it's impossible to set up an ADO.NET connection to MySQL
// using EzAPI and potentially even with the raw SSIS API...
var pkg = new EzPackage(a.LoadPackage(#"C:\...\Package.dtsx", null));
pkg.Name = "Star";
var df = new EzDataFlow(pkg);
df.Name = "My DataFlow";
var src = new EzAdoNetSource(df);
src.Name = "Source Database";
src.SqlCommand = "SELECT * FROM enum_institution";
src.AccessMode = AccessMode.AM_SQLCOMMAND;
src.Connection = new EzConnectionManager(pkg, pkg.Connections["SourceDB"]);
src.ReinitializeMetaData();
var derived = new EzDerivedColumn(df);
derived.AttachTo(src);
derived.Name = "Prepare Dimension Attributes";
derived.LinkAllInputsToOutputs();
derived.Expression["SourceNumber"] = "id";
derived.Expression["Name"] = "(DT_STR,255,1252)description";
// EDIT: reordered the operation here and I no longer get an error, but
// I'm not getting any mappings or any input columns when I open the package in the designer
var dest = new EzOleDbDestination(df);
dest.AttachTo(derived, 0, 0);
dest.Name = "Target Database";
dest.AccessMode = 0;
dest.Table = "[dbo].[DimInstitution]";
dest.Connection = new EzConnectionManager(pkg, pkg.Connections["TargetDB"]);
// this comes from Yahia's link
var destInput = dest.Meta.InputCollection[0];
var destVirInput = destInput.GetVirtualInput();
var destInputCols = destInput.InputColumnCollection;
var destExtCols = destInput.ExternalMetadataColumnCollection;
var sourceColumns = derived.Meta.OutputCollection[0].OutputColumnCollection;
foreach(IDTSOutputColumn100 outputCol in sourceColumns) {
// Now getting COM Exception here...
var extCol = destExtCols[outputCol.Name];
if(extCol != null) {
// Create an input column from an output col of previous component.
destVirInput.SetUsageType(outputCol.ID, DTSUsageType.UT_READONLY);
var inputCol = destInputCols.GetInputColumnByLineageID(outputCol.ID);
if(inputCol != null) {
// map the input column with an external metadata column
dest.Comp.MapInputColumn(destInput.ID, inputCol.ID, extCol.ID);
}
}
}
Basically, anything that involves calls to ReinitializeMetadata() results in 0xC0090001, because that method is where the error happens. There's no real documentation to help me, so I have to rely on any gurus here.
I should mention that the source DB is MySQL and the target DB is SQL Server. Building packages like this using the SSIS designer works fine, so I know it's possible.
Feel free to tell me if I'm doing anything else wrong.
EDIT: here's a link to the base package I'm using as a template: http://www.filedropper.com/package_1 . I've redacted the connection details, but any MySQL and SQL Server database will do. The package will read from MySQL (using the MySQL ADO.NET Connector) and write to SQL Server.
The database schema is mostly irrelevant. For testing, just make a table in MySQL that has two columns: id (int) and description (varchar), with id being the primary key. Make equivalent columns in SQL Server. The goal here is simply to copy from one to the other. It may end up being more complex at some point, but I have to get past this hurdle first.
I can't test this now BUT I am rather sure that the following will help you get it working:
Calling ReinitializeMetadata() causes the component to fetch the table metadata. This should only be called after setting the AccessMode and related property. You are calling it before setting AccessMode...
Various samples including advice on debugging problems
define the derived column(s) directly in the SQL command instead of using a EzDerivedColumn
try to get it working with 2 SQL Server DBs first, some of the available MySQL ADO.NET provider have some shortcomings under some circumstances
UPDATE - as per comments some more information on debugging this and a link to a complete end-to-end sample with source:
http://blogs.msdn.com/b/mattm/archive/2009/08/03/looking-up-ssis-hresult-comexception-errorcode.aspx
http://blogs.msdn.com/b/mattm/archive/2009/08/03/debugging-a-comexception-during-package-generation.aspx
Complete working sample with source
I've had this exact same issue and been able to resolve it with a lot of experimentation. In short you must set the connection for both the source and destination, and then call the attachTo after both connections are set. You must call attachTo for every component.
I've written a blog about starting with an SSIS package as a template, and then manipulating it programmatically to produce a set of new packages.
The article explains the issue more.
I have a project that runs some code on SSIS in SqlServer 2005 and SqlServer 2008. My problem is that i maintain two Visual Studio solutions for this, because the data types for the two versions of the SQL Server are different (ends with ..90 on SQL Server 2005 and ...10 on SQL Server 2008). They are in different assemblies also.
Is there an easy way to manage this, both in development and in build, i hate having to enter my code in two places (each solution) and with SQL Server 2011 coming i suspect that i will have to do it three times. How do you solve this, or any advice on how to solve this in general?
Edit:
Here is a sample of what I'm doing, as i see it its hard to factor this out in an interface, or?
foreach (IDTSVirtualInputColumn90 virtualColumn in virtualInput.VirtualInputColumnCollection)
{
if (string.Compare(virtualColumn.Name, columnTransformation.FromColumn.Name, true) == 0 || (columnTransformation.FromColumn.Preformatted && columnTransformation.FromColumn.Name.EndsWith(" as \"" + virtualColumn.Name + "\"")))
{
convInstance.SetUsageType(input.ID, virtualInput, virtualColumn.LineageID, DTSUsageType.UT_READONLY);
IDTSOutputColumn90 outputColumn = convComponent.OutputCollection[0].OutputColumnCollection.New();
outputColumn.Name = virtualColumn.Name + " (Converted)";
outputColumn.SetDataTypeProperties(columnTransformation.ToColumn.DataType, columnTransformation.ToColumn.Length, columnTransformation.ToColumn.Precision, columnTransformation.ToColumn.Scale, 0);
outputColumn.ErrorRowDisposition = DTSRowDisposition.RD_FailComponent;
outputColumn.TruncationRowDisposition = DTSRowDisposition.RD_IgnoreFailure;
IDTSCustomProperty90 outputProp = outputColumn.CustomPropertyCollection.New();
outputProp.Name = "SourceInputColumnLineageID";
outputProp.Value = virtualColumn.LineageID;
outputProp = outputColumn.CustomPropertyCollection.New();
outputProp.Name = "FastParse";
outputProp.Value = false;
break;
}
}
It's not really clear what your code is doing, but the normal approach to this sort of thing would be to create an interface or abstract class, and then have multiple implementations (or derived classes) for the specialized behaviour. All the common code can just talk to the abstraction, letting the implementation deal with the details.
I'm facing currently a problem regarding Subsonic configuration.
What I want to achieve is using subsonic data access in a System.Web.UI.Design.ControlDesigner class.
This class is hosted in Visual Studio Environment and enables design time operations on the attached System.Web.UI.WebControls.Control.
The only problem is SubSonic seems always looking for SubSonicSection in the application configuration regardless passing connection string to it.
The relevant code snippet:
using (SharedDbConnectionScope dbScope = new SharedDbConnectionScope(new SqlDataProvider(), ConnectionString))
{
Table1 _table1 = new Select().From<..().Where(...).IsEqualTo(...).ExecuteSingle<...>();
Throws exception on ExecuteSingle() method (configuration section was not found)
while
using (SharedDbConnectionScope dbScope = new SharedDbConnectionScope(ConnectionString))
{
Throws exception on new SharedDbConnectionScope() (configuration section was not found)
So the question is:
Is there any way to pass the settings runtime to bypass the configuration section lookup as I don't want to add any subsonic specific configuration to devenv.configuration
Thanks
I don't think you can do this in 2.x without customising the templates (which can obviously give support issues when a newer version of SubSonic is released).
Sorry, don't know about 3.0
I'm assuming you're using SubSonic 2.x based on your query syntax. Have a look at the following two forum posts which should point you in the right direction. What you're trying to do is possible, in fact SubCommander does exactly this, download the source and have a look at the SetProviderManually() method.
http://forums.subsonicproject.com/forums/t/1617.aspx
http://forums.subsonicproject.com/forums/t/1502.aspx
The method to use Subsonic runtime provider configuration:
(example):
private void SetSubsonicProviderManually(string ConnectionString)
{
//clear the providers and reset
DataService.Provider = new SqlDataProvider();
DataService.Providers = new DataProviderCollection();
//instance a section - we'll set this manually for the DataService
SubSonicSection section = new SubSonicSection();
section.DefaultProvider = __SubsonicProviderName__;
//set the properties
DataProvider provider = DataService.Provider;
NameValueCollection config = new NameValueCollection();
//need to add this for now
config.Add("connectionStringName", __ConnectionString__);
//initialize the provider
provider.Initialize(__SubsonicProviderName__, config);
provider.DefaultConnectionString = ConnectionString;
DataService.Providers.Add(provider);
}