How can I connect to SQL server with Entity? - entity-framework

I'm following a tutorial (http://www.asp.net/mvc/overview/getting-started/introduction/accessing-your-models-data-from-a-controller)
And in there he's using SQL server localdb.
This is my first try with MVC. Last project I did with asp and had no trouble connecting to the database (which runs on a different server)
So how can I connect to my SQL server 2014 using entity?
Thanks.

Go in your web.config file
Find the connectionStrings section.
Setup your connection string to use the sql server 2014
<
add name="DefaultString" providerName="System.Data.SqlClient" connectionString="Server=YourServer;Database=YourDatabase;UID=YourUserId;PWD=YourPassword;" >
For more information on connection string

Others
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework">
<parameters>
<parameter value="(localdb)\mssqllocaldb" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
<connectionStrings>
<add name="DefaultConnection"
connectionString="Data Source=localhost;Initial Catalog=Vidly;Integrated Security=True" providerName="System.Data.SqlClient"/>
</connectionStrings>

Connecting to SQL Db with the help of Entity framework is very easy and interesting.
The link which you are following is incomplete because they haven't shown how to connect with DB
For connecting DB there are multiple ways,In this example i will show you DB first method.
Create a DB in your SQL server.
Go to your MVC project -> right click on Models folder -> Add ->ADO.NET entity Data Model -> Enter any name for your Model -> Press Ok -> This will prompt You " Entity Data Model Wizard " -> Select Generate from Database -> Press Next-> New Connection ->This will prompt you Connection Properties,from here you just select your Database. this is how you can connect with your DB ,These are are steps you have to follow first,then continue with you Tutorial Link.Connection Properties configuration Screenshot

Related

EntityFramework connect to Visual Studio SQL Server (localdb)

I am running a local instance of Sql Server through Visual Studio:
It is online and I am able to view the data in the database through the UI.
My App.config file looks like the following:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/>
</configSections>
<connectionStrings>
<add name="EntitiesContext" connectionString="Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=master;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False" providerName="System.Data.SqlClient"/>
<add name="DefaultConnection" connectionString="Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=master;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False" providerName="System.Data.SqlClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="mssqllocaldb" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient"
type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
<startup><supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1"/></startup>
</configuration>
And my EntitiesContext looks like the following:
Could someone please help with what I am missing as this keeps failing connection with the following:
System.Data.SqlClient.SqlException: 'A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)'
Inner Exception
Win32Exception: The system cannot find the file specified
The issue is that the connection string you are using is reverting to a named pipe connection, and it's telling you that nothing is listening on that Pipe.
Changing it to "localhost\MSSQLLocalDB;...." should work if your local database is set up for Shared Memory connections.
To check what protocols are enabled on your server you can run MMC.exe then add the plugin for SQL Server Configuration Manager. Under SQL Server Network Configuration it will show whether your SQL Server instance is allowing Named Pipes or TCP/IP. I believe by default SQL Express only enables Shared Memory which is fine for local testing purposes.

Exception while deploying ASP.NET Website after Using EF

I have two projects, one containing WS which access to the DB and the other one is front-end.
The two projects are deployed on seperate servers.
Before Using EF and linq for accessing the DB in the WS project, everything was working fine, but after that I got and exception saying "the underlying provider failed on open".
Please ca you help me with that. Thank you in advance.
Here is my ConnectionString (WS Project):
<connectionStrings>
-->
<add name="ConString1" connectionString="Data Source=#address,1433;Initial Catalog = MpCarteCoBrandee;MultipleActiveResultSets=True;Trusted_Connection=True;" providerName="System.Data.SqlClient" />
<!--<add name="ConString" connectionString="Data Source=AOUS-PC;Initial Catalog=TestMobilePayment;Integrated Security=SSPI" providerName="System.Data.SqlClient" />-->
<add name="MobilePaymentEntities" connectionString="metadata=res://*/MobilePayment.csdl|res://*/MobilePayment.ssdl|res://*/MobilePayment.msl;provider=System.Data.SqlClient;provider connection string="data source=#address,1433;initial catalog=MobilePayment;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />

MVC Connection Strings/LocalDb

Fairly new to MVC so this probably seems like a fairly newbie question.
I've been developing my application using a SQLExpress instance/LocalDb, I'm now ready to deploy my site to production, so my question is how do I configure my web.config file for this environment?
My database has been created in production, I'm just struggling with establishing the connection strings.
I'm using a host that I think does not support LocalDB (GearHost), but sources seem to suggest this is possible (even though I've not found any decent examples).
My current development connection strings are below.
Thanks
<connectionStrings>
<add name="DefaultConnection" providerName="System.Data.SqlClient" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-MyApp-20160204160648;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-MyApp-20160204160648.mdf" />
<add name="MyEntities" connectionString="metadata=res://*/Models.Model1.csdl|res://*/Models.Model1.ssdl|res://*/Models.Model1.msl;provider=System.Data.SqlClient;provider connection string="data source=MyPC\SQLEXPRESS;initial catalog=MyDB;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework"" providerName="System.Data.EntityClient" />
</connectionStrings>
I have a MVC project.I use two conectionString as following
<add name="matematikEntities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=MySql.Data.MySqlClient;provider connection string="server=MYSERVERNAMEONHOST;user id=MYUSERID;password=MYPASSWORD;persistsecurityinfo=True;database=MYDBNAME"" providerName="System.Data.EntityClient" />
<add name="matematikEntities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=MySql.Data.MySqlClient;provider connection string="server=localhost;user id=root;password=MYPASSWORD;persistsecurityinfo=True;database=MYDBNAME"" providerName="System.Data.EntityClient" />
When i publish the project,i comment first one and second is active,when i work on my PC i comment second and first one is active.This works.

How to prevent EF to create localdb if connectionString is wrong (or missing at all)

I've a group of modules (persistence, service, mvc web, tools...) sharing common configuration parameters and allowing local overrides for particular environment/developer in app.config/web.config files using pre-build events.
Persistence module is based on EF 6.1 Code First with default initialization strategy i.e. CreateDatabaseIfNotExists.
Everything works smoothly except connection string is error or missing at all and update-database command is executed: if this is the case, EF ignores error connection string, somehow builds its own one and silently creates a new LocalDb database in current user folder.
How to prevent this behaviour? I want to create a new database, but only if there is a valid connection string. On invalid connection string an exception should be thrown.
If you want to change the default behaviour, Then you should change the default connection factory:
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0" />
</parameters>
</defaultConnectionFactory>
</entityFramework>
So if you don't provide the connection string, EF uses that as a default connection string. So you can change it easily:
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework">
<parameters>
<parameter value="Data Source=.; Integrated Security=True; MultipleActiveResultSets=True" />
</parameters>
</defaultConnectionFactory>
</entityFramework>
more info.

EF4 The provider did not return a Provider Manifest Token string

Yes, one more question about Provider manifest token. Unfortunately all previous 22 questions was not useful to solve my problem. I developing simple web application using MVC4 + Code First + Sql Express.
Here is my context descendant:
public class MCQContext : DbContext
{
public MCQContext()
: base("name=ApplicationConnection")
{
}
...............
}
And here - part of web.config related to the problem:
<configuration>
<configSections>
<section name="entityFramework"
type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
requirePermission="false" />
</configSections>
<connectionStrings>
<add name="ApplicationConnection"
connectionString="Data Source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|aspnetdb.mdf;User Instance=true"
providerName="System.Data.SqlClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework">
<parameters>
<parameter value="name=ApplicationConnection" />
</parameters>
</defaultConnectionFactory>
</entityFramework>
So, as you can see, correct connection string passed to base of context class (I got the same error if I rename connection string to "MCQContext" and do not pass anything to parent context class).
I have no idea how to fix it. This behavior reproduced if I creating absolutely empty MVC4 application, remove all packages (I prefer manually specify required assemblies and do not use NuGet) and fix references (including reference to sqlserver express).
The problem with your connection string here is:
<add name="TrempimModel"
connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;
AttachDBFilename=|DataDirectory|aspnetdb.sdf;
User Instance=true"
providerName="System.Data.SqlClient" />
You're basically defining what "server" you're connecting to - but you're not saying what database inside the file to connect to. Also - the file extension for SQL Server Express database files is .mdf (not .sdf - that's SQL Server Compact Edition) - you need to take that into account, too! (was a typo, according to comment by OP).
You need to define an extra database=.... (or Initial Catalog=.....) in your connection string:
<add name="TrempimModel"
connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;
database=YourDatabaseName;
AttachDBFilename=|DataDirectory|aspnetdb.mdf;
User Instance=true"
providerName="System.Data.SqlClient" />
Then it should work just fine.