I translate one dsl (A) to another dsl (B) create in xtext.
The code generation of A looks like
override void doGenerate(Resource resource, IFileSystemAccess2 fsa, IGeneratorContext context) {
fsa.generateFile('transformed.wp', resource.allContents.filter(typeof(ActionSystem)).map [
compile
].join(', '))
val rs = new ResourceSetImpl();
val r = rs.getResource(URI.createPlatformResourceURI('transformed.wp'), true);
val List<EObject> contentOfYourFile = r.getContents();
}
the error is then I call URI.createPlatformResourceURI('transformed.wp') the file cannot be found.
How do I access the file 'transformed.wp'.
The idea will be to copy part of the emf model of A to the model of B after the code was generated.
The solution was in IFileSystemAccess2
//create the file name
var fileuri = fsa.getURI('transformed.wp');
//get the name of the resource
var resource_name = fileuri.toString();
//get eh name of the resource
var file = fileuri.lastSegment;
Given the following test:
// setup
OClass driver = getDatabase().getMetadata().getSchema().createClass(DRIVER);
OClass car = getDatabase().getMetadata().getSchema().createClass(CAR);
car.createProperty(DRIVERS, OType.EMBEDDEDLIST, driver);
OClass team = getDatabase().getMetadata().getSchema().createClass(TEAM);
team.createProperty(CARS, OType.EMBEDDEDSET, car);
// exercise
ODocument alonso = new ODocument(DRIVER).field("name", "Fernando Alonso").field("nationality", "Spanish")
.field("yearOfBirth", 1981);
ODocument button = new ODocument(DRIVER).field("name", "Jenson Button").field("nationality", "british")
.field("yearOfBirth", 1980);
ODocument mp30 = new ODocument(CAR).field(DRIVERS, Arrays.asList(new ODocument[] { alonso, button }));
Set<ODocument> cars = new HashSet<>();
cars.add(mp30);
ODocument mclarenF1Team = new ODocument(TEAM).field(CARS, cars);
mclarenF1Team.save();
// verify
assertEquals(1, getDatabase().countClass(TEAM));
assertEquals(1, getDatabase().countClass(CAR));
assertEquals(2, getDatabase().countClass(DRIVER));
The second assertion fails:
java.lang.AssertionError: expected:<1> but was:<0>
at org.junit.Assert.fail(Assert.java:88)
at org.junit.Assert.failNotEquals(Assert.java:834)
at org.junit.Assert.assertEquals(Assert.java:645)
at org.junit.Assert.assertEquals(Assert.java:631)
at foo.orientdb.dataaccessapi.StoreJSonIT.testSchemaFull(StoreJSonIT.java:68)
Why does it fail?
The properties CAR and DRIVER are created as embedded list and embedded set, shouldn't a single save in mclarenF1Team do a cascade save for the embedded documents?
Embedded List/Set means that the documents you create will be embedded (Saved) in the parent document and not in his own class/cluster.
IF you want to achieve that behaviour you should use links
See here
http://orientdb.com/docs/2.1/Concepts.html#relationships
Here is my problem.
I use a dynamic connection string for my Entity Framework context.
//In Web Config
add key="DataSource" value="WIN-QBRH0MJL8IT\ISS" />
//In my EntityFactory.cs
public static DBEntities GetEntity()
{
var scsb = new SqlConnectionStringBuilder();
scsb.DataSource = ConfigurationManager.AppSettings["DataSource"];
scsb.InitialCatalog = "db1";
scsb.MultipleActiveResultSets = true;
scsb.IntegratedSecurity = true;
if (HttpContext.Current.Session["DBName"] == null)
{
HttpContext.Current.Response.Redirect("/Account/Step1");
}
else
{
scsb.InitialCatalog = HttpContext.Current.Session["DBName"].ToString();
}
var builder = new EntityConnectionStringBuilder();
builder.Metadata = "metadata=~/bin/Models/DBModel.csdl|~/bin/Models/DBModel.ssdl|~/bin/Models/DBModel.msl";
builder.Provider = "System.Data.SqlClient";
builder.ProviderConnectionString = scsb.ConnectionString;
DBEntities db = new DBEntities(builder.ConnectionString);
return db;
}
I Know the problem is for this line :
builder.Metadata =
"metadata=~/bin/Models/DBModel.csdl|~/bin/Models/DBModel.ssdl|~/bin/Models/DBModel.msl";
I check and the csdl, ssdl, msl are in /mvcinfosite/bin/Models/.csdl,.ssdl,.msl
The configuration for my edmx is:
Metadata Artifact Processing : Copy to Output Directory
Here is the full error
The specified metadata path is not valid. A valid path must be either
an existing directory, an existing file with extension '.csdl',
'.ssdl', or '.msl', or a URI that identifies an embedded resources
Thanks
Try to remove ~ character and use valid relative path to your app root. I think it is not able to work with this special character used on in ASP.NET application.
Given two different revisions need to get the differences between them, I intend to use the method duvuelve Diff but I anything as a result, it could be? Thanks.
My code is as follows
using (SvnClient client = new SvnClient())
using (MemoryStream result = new MemoryStream())
{
client.Authentication.DefaultCredentials = new NetworkCredential("asdf", "asdf/*");
try
{
//SvnUriTarget is a wrapper class for SVN repository URIs
SvnUriTarget target = new SvnUriTarget(textBox1.Text);
if (client.Diff(target, rango, result))
MessageBox.Show("Successfully para" + rango.ToString() + ".");
StreamReader strReader = new StreamReader(result);
string str = strReader.ReadToEnd();
}
}
The stream that is returned from the Diff() function is positioned at the end of the stream, so before creating your stream reader, you need to reposition it at the beginning of the stream:
result.Position = 0;
StreamReader strReader = new StreamReader(result);
I need to change the storage schema of the entities on runtime.
I've followed a wonderful post, available here:
http://blogs.microsoft.co.il/blogs/idof/archive/2008/08/22/change-entity-framework-storage-db-schema-in-runtime.aspx?CommentPosted=true#commentmessage
This works perfectly, but only for queries, not for modifications.
Any idea why?
Well, I was looking for this piece of code all around the Internet. In the end I had to do it myself. It's based on Brandon Haynes adapter, but this function is all you need to change the schema on runtime - and you don't need to replace the autogenerated context constructors.
public static EntityConnection Create(
string schema, string connString, string model)
{
XmlReader[] conceptualReader = new XmlReader[]
{
XmlReader.Create(
Assembly
.GetExecutingAssembly()
.GetManifestResourceStream(model + ".csdl")
)
};
XmlReader[] mappingReader = new XmlReader[]
{
XmlReader.Create(
Assembly
.GetExecutingAssembly()
.GetManifestResourceStream(model + ".msl")
)
};
var storageReader = XmlReader.Create(
Assembly
.GetExecutingAssembly()
.GetManifestResourceStream(model + ".ssdl")
);
XNamespace storageNS = "http://schemas.microsoft.com/ado/2009/02/edm/ssdl";
var storageXml = XElement.Load(storageReader);
foreach (var entitySet in storageXml.Descendants(storageNS + "EntitySet"))
{
var schemaAttribute = entitySet.Attributes("Schema").FirstOrDefault();
if (schemaAttribute != null)
{
schemaAttribute.SetValue(schema);
}
}
storageXml.CreateReader();
StoreItemCollection storageCollection =
new StoreItemCollection(
new XmlReader[] { storageXml.CreateReader() }
);
EdmItemCollection conceptualCollection = new EdmItemCollection(conceptualReader);
StorageMappingItemCollection mappingCollection =
new StorageMappingItemCollection(
conceptualCollection, storageCollection, mappingReader
);
var workspace = new MetadataWorkspace();
workspace.RegisterItemCollection(conceptualCollection);
workspace.RegisterItemCollection(storageCollection);
workspace.RegisterItemCollection(mappingCollection);
var connectionData = new EntityConnectionStringBuilder(connString);
var connection = DbProviderFactories
.GetFactory(connectionData.Provider)
.CreateConnection();
connection.ConnectionString = connectionData.ProviderConnectionString;
return new EntityConnection(workspace, connection);
}
The resulting EntityConnection should be passed as a parameter when instantiating the context. You can modify it, so all ssdl models are modified by this function, not only the specified one.
I've managed to resolve this issue by using a brilliant library, located in CodePlex (courtesy of Brandon Haynes), named "Entity Framework Runtime Model Adapter", available here:
http://efmodeladapter.codeplex.com/
I've tweaked it a bit, to fit our needs and without the need of replacing the designer code at all.
So, I'm good.
Thanks anyways, and especially to Brandon, amazing job!
I need import data from postgres database. It by default use schema "public". So I use Entity Framework CTP 4 "Code first". It by default use schema "dbo". To change it in runtime I use:
public class PublicSchemaContext : DbContext
{
protected override void OnModelCreating(System.Data.Entity.ModelConfiguration.ModelBuilder builder)
{
builder.Entity<series_categories>().MapSingleType().ToTable("[public].[series_categories]");
}
public DbSet<series_categories> series_categories { get; set; }
}
It work for select, insert, update and delete data. So next test in pass:
[Test]
public void AccessToPublicSchema()
{
// Select
var db = new PublicSchemaContext();
var list = db.series_categories.ToList();
Assert.Greater(list.Count, 0);
Assert.IsNotNull(list.First().series_category);
// Delete
foreach (var item in db.series_categories.Where(c => c.series_category == "Test"))
db.series_categories.Remove(item);
db.SaveChanges();
// Insert
db.series_categories.Add(new series_categories { series_category = "Test", series_metacategory_id = 1 });
db.SaveChanges();
// Update
var test = db.series_categories.Single(c => c.series_category == "Test");
test.series_category = "Test2";
db.SaveChanges();
// Delete
foreach (var item in db.series_categories.Where(c => c.series_category == "Test2"))
db.series_categories.Remove(item);
db.SaveChanges();
}
Not an answer per se but a followup on Jan Matousek's Create[EntityConnection] method showing how to use from a DbContext. Note DB is the DbContext type passed to the generic repository.
public TxRepository(bool pUseTracking, string pServer, string pDatabase, string pSchema="dbo")
{
// make our own EF database connection string using server and database names
string lConnectionString = BuildEFConnectionString(pServer, pDatabase);
// do nothing special for dbo as that is the default
if (pSchema == "dbo")
{
// supply dbcontext with our connection string
mDbContext = Activator.CreateInstance(typeof(DB), lConnectionString) as DB;
}
else // change the schema in the edmx file before we use it!
{
// Create an EntityConnection and use that to create an ObjectContext,
// then that to create a DbContext with a different default schema from that specified for the edmx file.
// This allows us to have parallel tables in the database that we can make available using either schema or synonym renames.
var lEntityConnection = CreateEntityConnection(pSchema, lConnectionString, "TxData");
// create regular ObjectContext
ObjectContext lObjectContext = new ObjectContext(lEntityConnection);
// create a DbContext from an existing ObjectContext
mDbContext = Activator.CreateInstance(typeof(DB), lObjectContext, true) as DB;
}
// finish EF setup
SetupAndOpen(pUseTracking);
}
I was able to convert the solution from Jan Matousek to work in vb.net 2013 with entity framework 6. I will also try to explain how to use the code in vb.net.
We have a JD Edwards Database which uses different Schema's for each environment (TESTDTA, CRPDTA, PRODDTA). This makes switching between environments cumbersome as you have to manually modify the .edmx file if you want to change environments.
First step is to create a partial class that allows you to pass a value to the constructor of your entities, by default it uses the values from your config file.
Partial Public Class JDE_Entities
Public Sub New(ByVal myObjectContext As ObjectContext)
MyBase.New(myObjectContext, True)
End Sub
End Class
Next create the function that will modify your store schema .ssdl file in memory.
Public Function CreateObjectContext(ByVal schema As String, ByVal connString As String, ByVal model As String) As ObjectContext
Dim myEntityConnection As EntityConnection = Nothing
Try
Dim conceptualReader As XmlReader = XmlReader.Create(Me.GetType().Assembly.GetManifestResourceStream(model + ".csdl"))
Dim mappingReader As XmlReader = XmlReader.Create(Me.GetType().Assembly.GetManifestResourceStream(model + ".msl"))
Dim storageReader As XmlReader = XmlReader.Create(Me.GetType().Assembly.GetManifestResourceStream(model + ".ssdl"))
Dim storageNS As XNamespace = "http://schemas.microsoft.com/ado/2009/11/edm/ssdl"
Dim storageXml = XDocument.Load(storageReader)
Dim conceptualXml = XDocument.Load(conceptualReader)
Dim mappingXml = XDocument.Load(mappingReader)
For Each myItem As XElement In storageXml.Descendants(storageNS + "EntitySet")
Dim schemaAttribute = myItem.Attributes("Schema").FirstOrDefault
If schemaAttribute IsNot Nothing Then
schemaAttribute.SetValue(schema)
End If
Next
storageXml.Save("storage.ssdl")
conceptualXml.Save("storage.csdl")
mappingXml.Save("storage.msl")
Dim storageCollection As StoreItemCollection = New StoreItemCollection("storage.ssdl")
Dim conceptualCollection As EdmItemCollection = New EdmItemCollection("storage.csdl")
Dim mappingCollection As StorageMappingItemCollection = New StorageMappingItemCollection(conceptualCollection, storageCollection, "storage.msl")
Dim workspace = New MetadataWorkspace()
workspace.RegisterItemCollection(conceptualCollection)
workspace.RegisterItemCollection(storageCollection)
workspace.RegisterItemCollection(mappingCollection)
Dim connectionData = New EntityConnectionStringBuilder(connString)
Dim connection = DbProviderFactories.GetFactory(connectionData.Provider).CreateConnection()
connection.ConnectionString = connectionData.ProviderConnectionString
myEntityConnection = New EntityConnection(workspace, connection)
Return New ObjectContext(myEntityConnection)
Catch ex As Exception
End Try
End Function
Make sure that the storageNS namespace hardcoded value matches the one used in your code, you can view this by debugging the code and examining the storageXML variable to see what was actually used.
Now you can pass a new schema name, and different database connection info at runtime when you create your entities. No more manual .edmx changes required.
Using Context As New JDE_Entities(CreateObjectContext("NewSchemaNameHere", ConnectionString_EntityFramework("ServerName", "DatabaseName", "UserName", "Password"), "JDE_Model"))
Dim myWO = From a In Context.F4801 Where a.WADOCO = 400100
If myWO IsNot Nothing Then
For Each r In myWO
Me.Label1.Text = r.WADL01
Next
End If
End Using
These were the .net libraries used:
Imports System.Data.Entity.Core.EntityClient
Imports System.Xml
Imports System.Data.Common
Imports System.Data.Entity.Core.Metadata.Edm
Imports System.Reflection
Imports System.Data.Entity.Core.Mapping
Imports System.Data.Entity.Core.Objects
Imports System.Data.Linq
Imports System.Xml.Linq
Hope that helps anyone out there with the same issues.
I had a lot of problems getting this to work when using EF6 with an OData Data Service, so I had to find an alternate solution. In my case, I didn't really need to do it on the fly. I could get away with changing the schema when deploying to some test environments, and in the installer.
Use Mono.Cecil to rewrite the embedded .ssdl resources straight in the DLLs. This works just fine in my case.
Here is a simplified example of how you can do this:
var filename = "/path/to/some.dll"
var replacement = "Schema=\"new_schema\"";
var module = ModuleDefinition.ReadModule(filename);
var ssdlResources = module.Resources.Where(x => x.Name.EndsWith(".ssdl"));
foreach (var resource in ssdlResources)
{
var item = (EmbeddedResource)resource;
string rewritten;
using (var reader = new StreamReader(item.GetResourceStream()))
{
var text = reader.ReadToEnd();
rewritten = Regex.Replace(text, "Schema=\"old_schema\"", replacement);
}
var bytes = Encoding.UTF8.GetBytes(rewritten);
var newResource = new EmbeddedResource(item.Name, item.Attributes, bytes);
module.Resources.Remove(item);
module.Resources.Add(newResource);
}