Is there any difference in case of connection string using in Entity Framework Data Model and Linq to SQL?
The connection string in app.config file is shown below
In linq <add name="EFProject.Properties.Settings.TestDBConnectionString" connectionString="Data Source=datasourse;Initial Catalog=TestDB;User ID=uname;Password=pwd" providerName="System.Data.SqlClient" />
In entity framework : <add name="TestDBEntities" connectionString="metadata=res://*/TestDB.csdl|res://*/TestDB.ssdl|res://*/TestDB.msl;provider=System.Data.SqlClient;provider connection string="data source=datasourse;initial catalog=TestDBDB;user id=uname;password=pwd;multipleactiveresultsets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
The syntax difference means....?
The EntityFramework connection string contains details of the metadata files that define your model. These are the .ssdl, .csdl, and .msl files that are specified. Collectively they make up the edmx file.
Related
I have two projects
MyProject //MVC 3 app
MyProject.DAL //Class Library project type
Inside MyProject.DAL there is a folder EntityModels which contains generated entity (EF Code-First approach):
namespace MyProject.DAL.EntityModels
{
using System;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
public partial class myEntities : DbContext
{
public myEntities() : base("name=myEntities")
{
...
}
}
}
app.config:
<add name="myEntities" connectionString="metadata=res://*/EntityModels.DBMainModel.csdl|res://*/EntityModels.DBMainModel.ssdl|res://*/EntityModels.DBMainModel.msl;provider=..." providerName="System.Data.EntityClient" />
then, I want to use that entity in my MyProject project, so I add the same connection string in the web.config file.
But, I get the Unable to load the specified metadata resource. error. I tried make some modifications in the web.config like
<add name="myEntities"
connectionString="metadata=res://*/MyProject.DAL.EntityModels.DBMainModel.csdl|
res://*/MyProject.DAL.EntityModels.DBMainModel.ssdl|
res://*/MyProject.DAL.EntityModels.DBMainModel.msl;provider=..." providerName="System.Data.EntityClient" />
<add name="myEntities"
connectionString="metadata=res://MyProject.DAL.EntityModels.DBMainModel.csdl|
res://MyProject.DAL.EntityModels.DBMainModel.ssdl|
res://MyProject.DAL.EntityModels.DBMainModel.msl;provider=..." providerName="System.Data.EntityClient" />
<add name="myEntities"
connectionString="metadata=res://MyProject.DAL/EntityModels.DBMainModel.csdl|
res://MyProject.DAL/EntityModels.DBMainModel.ssdl|
res://MyProject.DAL/EntityModels.DBMainModel.msl;provider=..." providerName="System.Data.EntityClient" />
but nothing works. How to fix it ?
If it's code-first, you should put pure connectionString value in your appropriate .config file (You're dealing with SqlClient not EntityClient).
To find out more about ConnectionString values, take a look at http://www.connectionstrings.com/sql-server/.
For SQL Server databases, basically it is like below:
<add name="MyEntities" connectionString="Data Source=myServerName\myInstanceName;Initial Catalog=myDataBase;User Id=myUsername;Password=myPassword;" providerName="System.Data.SqlClient"/>
I use Entity Framework Code First,
My connection string is in a configuration file:
<connectionStrings>
<clear/>
<add name="ApplicationServices" connectionString="Data Source=PC-X;Initial Catalog=MYdb;Integrated Security=True"/>
</connectionStrings>
When I try to access the data (something that should create the DB) is falling with the following error:
The connection string 'ApplicationServices' in the application's
configuration file does not contain the required providerName
attribute."
What am I missing?
You're missing the following piece of code after the connectionString attribute (assuming that you're using SQL):
providerName="System.Data.SqlClient"
Sometime in the future. the complete code
<add name="YouContext" connectionString="Integrated Security=True;Persist Security Info=False;Initial Catalog=YourDatabaseName;Data Source=YourPCName;" providerName="System.Data.SqlClient"/>
Go down in your web.config until you reach the providers tag.
For instance, here's my providers statement:
<providers><provider invariantName="System.Data.SqlClient" ... /></providers>
you should add this System.Data.SqlClient as a provider name in your connection string
so your connection string should look like this:
<connectionStrings>
<add name="ApplicationServices" providerName="System.Data.SqlClient" connectionString="Data Source=PC-X;Initial Catalog=MYdb;Integrated Security=True"/>
</connectionStrings>
In my case the problem was with an incorrect StartUp project target. In the PM console the target migration assembly project was correct.
I have a multiproject solution and the target was on some web-service project.
So I changed the StartUp to the main WebSite project and the migration have complited without errors.
I developed a web site on my local pc and local database using entity framework, Now I gave all the code to my client now the entity framework gives an error underlying provider failed on open I modified data source, initial catalog, user id and password of the connection string of entity framework but of no use please help. below is my connection string.
<add name="SBV_dbEntities" connectionString="metadata=res://*/SBVEntityModel.csdl|res://*/SBVEntityModel.ssdl|res://*/SBVEntityModel.msl;provider=System.Data.SqlClient;provider connection string="data source=.\SQLEXPRESS;initial catalog=yagnesh_db;user id=yagnesh;password=yagnesh#123;multipleactiveresultsets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
use like below.Give a connection string to the SQL server is as below (This is a sample code).
<add name="ContextName" connectionString="Data Source=ServerName;Initial Catalog=DBCatalogName;Integrated Security=True;MultipleActiveResultSets=True;App=EntityFramework"
providerName="System.Data.SqlClient" />
e.g.
<add name="PawLoyalty" connectionString="Server=.;database=PawLoyalty;Trusted_connection=true;pooling=true;MultipleActiveResultSets=True" providerName="System.Data.SqlClient" />
I hope this will help to you.
I am using Entity Framework Code First 4.3 + Azure and having difficulties connecting to the database. The error I get is the following (on the first query):
Keyword not supported: 'server'.
I have the following connection set up in my Web.config
<configSections>
type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.3.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
</configSections>
<connectionStrings>
<add name="TestDBContext"
connectionString="Server=tcp:[SUBSCR].database.windows.net,1433;Database=[MyDB];User ID=[user];Password=[pass];Trusted_Connection=False;Encrypt=True;PersistSecurityInfo=True"
providerName="System.Data.EntityClient" />
</connectionStrings>
My DbContext implementing class uses the connection string's name:
public class MyContext : DbContext, IMyContext
{
public MyContext()
: base("TestDBContext")
{
Configuration.LazyLoadingEnabled = true;
Configuration.ProxyCreationEnabled = true;
}
Can you tell what is going on?
I just had the same problem.
You're missing all the metadata in the connection string that Entity Framework requires. The connection string provided by SQL Azure needs to inserted within the provider connection string parameter of EF's connection string.
<add name="MyConnectionString" connectionString="metadata=res://*/Model.Model.csdl|res://*/Model.Model.ssdl|res://*/Model.Model.msl;provider=System.Data.SqlClient;provider connection string="[PUT SQL AZURE CONN STRING HERE]"" providerName="System.Data.EntityClient" />
You'll need to use the metadata from your own project. I pulled that metadata from an EF project generating from an existing database.
I had the same problem. I solved, putting in the web.config this connectionstring:
<add name="eManagerTurModelConnection" connectionString="metadata=res://*/ORM.eManagerFinanceModel.csdl|res://*/ORM.eManagerFinanceModel.ssdl|res://*/ORM.eManagerFinanceModel.msl;provider=System.Data.SqlClient;provider connection string="Data Source=<server>.database.windows.net;Initial Catalog=eManagerTur;Integrated Security=False;User ID=<user>;Password=<Password>;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
And after I removed the connectionstring of my website, worked, because it was not getting the connection string that I added in my web.config.
English bad... =)
The provider should be providerName="System.Data.SqlClient"
I connected to Azure from VS and then looked at the properties and set my connection string and provider name.
<add name="context" connectionString="Data Source=myServer,myPort;Initial Catalog=myDBName;Persist Security Info=True;User ID=myUserName;Password=myPassword;" providerName="System.Data.SqlClient"/>
I was then able to run update-database with no issues.
i tried like this, it may help you. may be 1433 is making problem, is it port no ? or what? . try like this.
check this link Windows Azure with Sql
<add name="dbContext" connectionString="Server=tcp:xxxxxxxx.database.windows.net;Database=xxxxxxxx;User ID=xxxxxxx#xxxxxxxxx;Password=xxxxxxxxxx;Trusted_Connection=False;Encrypt=True;" providerName="System.Data.EntityClient" />
Try this:
Data Source=tcp:YOUR-DATABASE-HERE.database.windows.net,1433;
Database=GolfRounds;
User ID=YOUR-USERNAME#YOUR-SERVER; Password=YOUR-PASSWORD; Trusted_Connection=False; Encrypt=True;
There is also an MSDN article at http://msdn.microsoft.com/en-us/library/windowsazure/ff951633.aspx that may be helpful.
I had a similar problem where I did not have access to the metadata, in this case you need to use System.Data.SqlClient as the provider. You will also need to add MultipleActiveResultSets=True to your connection string
I was attempting to create a set of custom classes to create my own provider that the Entity Framework would be communicating with. I had created my custom class that inherited from the abstract class DbProviderFactory and had just begun testing to see if I could get it to talk with EF, but I ran into issues.
<configuration>
<system.data>
<DbProviderFactories>
<add name="Custom Data Provider"
invariant="CustomClient"
description=".Net Framework Data Provider for Custom"
type="CustomClient.CustomProviderFactory, CustomClient,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
</DbProviderFactories>
</system.data>
<connectionStrings>
<add name="AdventureWorksEntities"
connectionString="metadata=...;
provider=CustomClient;
provider connection string="data source=.;
initial catalog=AdventureWorks;integrated security=True;
multipleactiveresultsets=True;App=EntityFramework""
providerName="System.Data.EntityClient" />
</connectionStrings>
</configuration>
With my CustomClient defined above I thought it would be smooth sailing into Entity goodness, but when my code attempts to create a new AdventureWorksEntities object I get the following exception:
InvalidOperationException
The requested .Net Framework Data Provider's implementation does not have an Instance field of a System.Data.Common.DbProviderFactory derived type.
Looking over the available overrides for DbProviderFactory makes no mention of an Instance member. I'm not really sure why it is requiring this field if it is not part of the class/interface for DbProviderFactory. Is the fix as simple as providing a field named Instance that returns an object of my custom type?
Add this to your custom provider:
public static readonly CustomProviderFactory Instance = new CustomProviderFactory();
All build in factories have this - they are used as singleton.