How to change the connection string in the entityframework. Stack overflow for teams is a private, secure spot for you and your coworkers to find and share information. Unable to convert runtime connection string to its designtime equivalent. Net that support the development of dataoriented software applications. When metadata is loaded, the entityconnection verifies that the conceptual model, the storage model, and the mapping file are all present. The way the connection string is specified has changed from the previous version of the entity framework. Since both are pointing to the same physical sql server, we would like to remove the entity framework connection string from the config file and then auto build the string based on the current ado. There are several ways by which you can provide the connection string to ef core application.
The reason is, when the first request hits a controller to fetch data, the connection string will be formed and it will be used by every subsequent request. This page describes the behavior of entity framework with regard to passing connections to the context and the functionality of the database. Database first and entity framework dynamic connection string tag. This connection string does not include references to metadata files, so entityframework does not know where to find them. In the code page for your application, add the following using statements imports in visual basic. Theyre very easy to use, you can work with them either on powershell or on the package manager console. I hold a bs degree in software engineering and am a microsoft certified solution developermcsd. The entity framework is a set of technologies in ado. In this case the metadata is locked at construction time.
Connection strings in entity framework core learn entity. Pass connection string at run time to entity framework. Answer dbcontext has a constructor overload that accepts the name of a connection string or a connection string itself. Idbcontextfactory needs to have configuration string to the database. In this example we have implemented a singleton class to supply the connection string. That is so it will work for anyone who downloads and installs the application. You are getting the code first mode exception because you are passing a dbconnection built with the ado. The nfig file is also copied on build to the bindebug directory and renamed to. An invalid provider connection string will cause a runtime error when it is evaluated by the data source.
Set the connection string for entity framework at runtime codeproject. But, the dbcontext resides in the repository layer. Net connection string is used rather than the entity framework connection string used by database first or model first paths. Connection strings go in the standard connectionstrings element and do not require the entityframework section. This article deals with how to solve the problem of building and setting an entity framework connection string at runtime, based on a databasefirst approach i. May 18, 2010 entity framework connection strings always includes paths to the three files that make up the data model, the database connection string and provider information. Add the adventureworks sales model to your project and configure your project to use the entity framework. Dynamically change entity framework connection string. They must model the entities, relationships, and logic of the business problems. But there is no way that migrations gets the connection string from nfig. Like entity framework where connection string names can be. Architects and developers of dataoriented applications have typically struggled with the need to achieve two very different objectives. The ultimate guide to connection strings in nfig elmah. Why shouldnt i use the repository pattern with entity framework.
Jul 18, 2014 when using entity framework, the database connection string is stored in the nfig file by default, and the entity object references that to connect to the database. Net framework will attempt to automatically reconnect broken sql connections. Preparing an entity framework model for multi provider. Entity framework and changing schema values oracle community. In this article, we are going to focus on the ability to dynamically set the connection string for your entity framework model. When setting in the startup the connectionstring for entityframeworkserviceoptions and then registering it in the identityserverservicefactory. That is, currently the connection string autogenerated for me has an absolute path in it. Managing connection strings in entity framework core connection strings contain information about the data source that is being connected to. To create a dbcontext with an appropriate programmatically set connection string, use the entityconnectionstringbuilder class. This information varies from provider to provider, but will usually include the name and location of the source, and optionally some means of authenticating the user.
If, for any reason, a user needs to change the database, he can do so simply by editing that file prior to running the program. We have to select a connection string of the database. Entity framework 6 dynamic connections string using simple. Database connection string error after changing dbcontext. Select required database objects you want to manage in this example there is only a table named people. This topic covers how entity framework discovers which database connection to use, and how you can change it. Entity framework and changing schema values b66f6fa5e98b4d0386c82123218258f0 nov 6, 20 9. How should i edit an entity framework connection string. Passing connections to the context behavior for ef5 and earlier versions. A connection string pointed to the cms files is added to the nfig file. Id like to supply the connection string for my database at runtime. Database first and entity framework dynamic connection string. We are in a mixed environment where our application is using both ado.
This shows how to set or change the connection string for entity framework at run time programmatically string connectionstring new system. The wizard connects to the database and presents a list of the objects that you can include in your model. Changing databases at runtime using entity framework. Just open the context file of entity framework and modify the code as in the following.
Config box, and enter entities in the text box as shown in figure 3. A connection string contains initialization information that is passed as a parameter from a data provider to a data source. Ive been searching a bit,and i tried a lot for windows authentication. How can i use ef codefirst auto database migration and have it to work. Most people are satisfied with that, but based upon a recent experience, i found a different way.
When using entity framework, the database connection string is stored in the nfig file by default, and the entity object references that to connect to the database. Click the yes, include the sensitive data in the connection string. Oct 07, 2010 hi, can someone confirm how to change the autogenerated connection string for an entity framework application so that it is relative. With that done, we need to configure entity framework to use our tenantspecific connection strings. The connection string entry is an element of the connectionstrings section in the configuration file. If i comment out the database initializer, it works.
Although this will typically make apps more reliable, there are edge cases in which an app needs to know that the connection was lost so that it can take some action upon reconnection. If you receive a test connection succeeded message, move on to these steps. Nov 08, 20 shows setting up an entity framework connection string to connect to sql server. The ef connection string that was auto generated for northwind.
If you have visual studio, then you most likely already have sqlce installed. Typically an entity framework application uses a class derived from dbcontext. Oct 15, 2018 a connection string contains initialization information that is passed as a parameter from a data provider to a data source. This page provides more details on how entity framework determines the database to be used, including connection strings in the configuration file. No changes to the connection string are ever allowed. Hey folks, i am using visual studio 20, entity framework 5. The connection string name should match the application context name. This also would be useful if you want to encrypt the connection string using your own. Set the connection string for entity framework at runtime. Aug 16, 2015 this article deals with how to solve the problem of building and setting an entity framework connection string at runtime, based on a databasefirst approach i. This article was originally posted here at programmers ranch on saturday 16th november 20. Entity framework 6 set connection string runtime stack overflow. Sep 17, 2017 mvc using entity framework connection string setup to authenticate sql server remote database of godaddy. Discussion of open issues, suggestions and bugs regarding entity framework support in ado.
Entity framework core migrations with azure service fabric. Aug 02, 2011 set the connection string for entity framework at runtime. The syntax depends on the data provider, and the connection string is parsed during the attempt to open a connection. Entity framework how can i change connection string to be. Aug 18, 2017 ef core allows you to generate a dbcontext based on an existing database connection, databasefirst. Database connection string in entity framework core. We will be focusing our efforts in the most recent version which as of this writing is entity framework version 6. Connection strings used by the entity framework contain information used to connect to the underlying. You can read it database connection string in entity framework. Change connection at run time entity framework entity framework. In this article we will see how to pass a connection string at run time to the entity framework. I want sample connection string for sql server db using entity framework with windows authentication.
Programmatic connection strings in entity framework 6. It is not possible to get migrations to work, as the connection string resides in the nfig. Set entity framework connection string at runtime stack overflow. So when a call is made, i query the configuration database for the connection string for the current user the current unit of work injected points to the configuration database, and somehow instantiate a new scoped unit of work with the new connection string connection using the di container. Estou criando um projeto utilizando entity framework. Setting connection strings at runtime with entity framework 5. Models created with code first and the ef designer are both covered in this topic. The syntax highlighting was added when the article was migrated here. Ef core allows you to generate a dbcontext based on an existing database connection, databasefirst. This topic provides an example of how to build an entityconnection. Implement your own version and pass it to the base constructor. Configuring entity framework as our sample project was created using the boilerplate asp. Mvc entity framework connection string to remote sql server.
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