Part 2 entity framework code first apporach and change. Entity framework change schema name at runtime oracle. Therefore, what i want to accomplish is giving the connection string as a parameter to a controller and change it at runtime. Setting a log4net adonetappender connection string at runtime. 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. Dbcontext has a constructor overload that accepts the name of a connection string or a connection string itself. How should i edit an entity framework connection string. Changing databases at runtime using entity framework. The transform is good for deploying a connection string that only changes for the different evironments test, production. The dbcontext would be generated like below when i add entity data model. Gets or sets the name of a section as defined in a configuration file. To continue using database first or model first ensure that the entity framework connection string is specified in the config file of executing application. 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. Entity framework dbcontext constructor with connection string.
I create entity through wizard with one of the databases. How to change the connection string in the entityframework. Can i change the ef core connection string at runtime from a controller. Ef7 change connectionstring at runtime connection string entity framework core runtime. Entity framework articles entity framework 6 tutorial. If this is not possible, is there any other solution. Instead, the connection string will be a simple ado. I want to use the same web api same controllers, same functionalities, etc. Dec 30, 2015 for a customer i needed to customize the way an entity framework 6 databasefirst project connects to a sql server database. 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. Connection strings used by the entity framework contain information used to connect to the underlying. Dim sqlbuilder as new sqlconnectionstringbuilder set the properties for the data source. Database connection string error after changing dbcontext.
Ef7 change connectionstring at runtime entity framework core. However, if the connection found in the config file is a special entity framework connection string, then the dbcontext will use databasemodel first and the model specified in the connection string will be used. Nov 08, 20 shows setting up an entity framework connection string to connect to sql server. The syntax highlighting was added when the article was migrated here. I ran into an issue recently with rdp connections being blocked by the firewall in norton security suite. This was required, as leaving them out of the setup call was not allowed. I recently spent some time writing unit tests for some code that required me to mock an object that has a method with optional properties. Mar 04, 2011 change the connection string dynamically for edmx entity during run time. Everything works fine with single database but in my scenario user can use multiple databases, i mean the user should be able to change the connection string at runtime. How to change the entity framework connection string in. Connection strings go in the standard connectionstrings element and do not require the entityframework section. Get the keyvalue connection string from app config var sect namevaluecollectionconfigurationmanager.
Just open the context file of entity framework and modify the code as in the following. Gets or sets the metadata locations in the connection string. Net framework will attempt to automatically reconnect broken sql connections. The syntax depends on the data provider, and the connection string is parsed during the attempt to open a connection. Gets or sets the inner, providerspecific connection string.
Dynamically change entity framework connection string. Set the connection string for entity framework at runtime. Config as is checked, and that the value is set to adonetentities, as shown in figure 10. This also would be useful if you want to encrypt the connection string using your own. This page provides more details on how entity framework determines the database to be used, including connection strings in the configuration file. Entity framework 6 dynamic connections string using simple. Initially my application will connect with master database. Change the connection string dynamically for sqldatasource during run time. May 27, 20 entity framework change schema name at runtime nswandel may 27, 20 7. The approach of adding a constructor which takes the connection string name in a separate file to extend the partial dbcontext class allows the connection to be switched at runtime.
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. Hi all i make an entity framework for a database sql and another one for oracle using third party. Is it possible to change the connection string and scope name at runtime for synchronization of the sql server ce 3. Please, i have tries a lot but i nothing seems to be working so i need your help. I want to change the connection string of my application dynamically. Change entity connection string on runtime stack overflow. 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. Change connection string to sql server in entity framework. I have 4 identical databases on 4 different servers. Database connection string in entity framework core. Apr 24, 2015 the windows form application can open different sql server ce 3.
Change the connection string dynamically for sqldatasource. Open the nfig and comment on the connection string save file open the edmx go to properties, the connection string should be blank, close the edmx file again. If user is valid user then i will get the data base connection string of. I have to change default connection factory runtime using code first ef6. Changing entity framework model at runtime out of the box there is no way, or at least not an easy one, to change table or schema names used by the entity framework at runtime. Jul 21, 20 change connection string created by the wizard at runtime. Conclusion by using the above code, a user can switch over to any server and database at runtime instead of editing nfig file each time for adding a new connection string. This shows how to set or change the connection string for entity framework at run time programmatically. Changing efs default connection factory from localdb to sql. Aug 02, 2011 set the connection string for entity framework at runtime. 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. Change the connection string dynamically for edmx entity during run time.
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. You can choose either to use windows authentication or sql authentication. We create separate database per each project that user creates in the application. Blogposts as table name during development you can not use mydbname. The way the connection string is specified has changed from the previous version of the entity framework. How to change databases at runtime in a userfriendly manner. Amastaneh blog is a discussion site on software development, programming, algorithms, software architectures, software runtime errors and solutions from software engineers who love building great softwares. Net framework data provider in the connection string. This also would be useful if you want to encrypt the connection string. One of the things in my old project is that i was able to change the database connection string at runtime in ef 4. Dec 01, 2017 so after setting up a section in the nfig i swaped out the datasource and then pass it into the dbcontext as the connection string.
Use a custom connectionstring in entity framework obelink. Mvc entity framework connection string to remote sql. Change the connection string dynamically for edmx entity. Implement your own version and pass it to the base constructor. You can read it database connection string in entity frame work. How can i use ef codefirst auto database migration and have it to work.
Change database name and click connect again and verify that the new database is connected. This page describes the behavior of entity framework with regard to passing connections to the context and the functionality of the database. I checked the traffic rules under settings firewall traffic rules and found that it was enabled by default and couldnt be edited. We will be focusing our efforts in the most recent version which as of this writing is entity framework version 6. What is the need for creating connection string dynamically for entity framework. Net entity framework and can step through my code linebyline while debugging and watch sql server profiler for every query executed, but i cant figure out where all those sql commands are coming fromsometimes when i execute savechanges, the entity framework performs. I hold a bs degree in software engineering and am a microsoft. But lets assume you have a fully working instance of sql server that you wish to work against instead of localdb. Make sure that save entity connection settings in app. This is the connection string that belongs to a databasefirst edmx model. Models created with code first and the ef designer are both covered in this topic. How can i see pending changesim creating an application with the ado.
This shows how to set or change the connection string for entity framework at run time programmatically string connectionstring new system. Keep the format of connection string in appsettings and change the datasource dynamically and create your objectcontext, till the time schema remains same it will work perfectly. Discussion of open issues, suggestions and bugs regarding entity framework support in ado. This topic covers how entity framework discovers which database connection to use, and how you can change it. Typically an entity framework application uses a class derived from dbcontext. You can set connection string used by ef core context in runtime. 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. Change the connection string dynamically per request on entity framework 7 mvc 6 core coremvc azuresqldatabase entity framework core english en. Setting connection strings at runtime with entity framework 5.
Aug 14, 2012 when you create a new project that makes use of entity framework 5, youll notice how it uses localdb by default now. Create dynamic connection database using application settings vb. It contains a path to the metadata files that are generated as resources into the assembly. In the previous versions of ef we were able to alter the dbcontext connection string as below. However, with questions like these we can nowadays luckily look at the sourcecode in github. Now i want to modify the connection string on runtime, to connect with other databases. Change the ef core connection string at runtime from a. Open the nfig and uncomment the connection string save file open the edmx, go to properties, you. Mar 20, 2016 so here im showing the simplest way to force the entity framework to create your database into sql server installed to the local system. Entity framework runtime due to forgetfulness, i forgot to change the execution environment from.
This article was originally posted here at programmers ranch on saturday 16th november 20. How to change entity framework connection string dynamically. Dynamically generating connection string for entity framework. Add the adventureworks sales model to your project and configure your project to use the entity framework. So here im showing the simplest way to force the entity framework to create your database into sql server installed to the local system. Part 2 entity framework code first apporach and change connection. Entity framework change connection at runtime exceptionshub. If i comment out the database initializer, it works. You can create objectcontext based on dynamic connection string if you use the nondefault overloaded constructor.
Change connection at run time ef pending changes ef performance ef tutorial entity framework vs dapper. Net core and ef core for the creation of a web api. Mvc entity framework connection string to remote sql server. 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. To use these classes, that were generated from database first or model first, with code first add any additional configuration using attributes or the dbmodelbuilder api and then remove the. I used the moq framework, and when i set up the method in question, i defaulted the optional parameters. Entity framework change connection string at runtime explanation needed 0. So if youre going to learn entity framework and you are struggling to find a good tutorial. It would be nice to have this set in a configuration file so. An existing or explicitly created dbconnection can also be used instead of the database connection name. Passing connections to the context behavior for ef5 and earlier versions. When using entity framework, the database connection string is stored in the.
Programmatic connection strings in entity framework 6. Mvc using entity framework connection string setup to authenticate sql server remote database of godaddy. Oct 15, 2018 a connection string contains initialization information that is passed as a parameter from a data provider to a data source. Pass connection string at run time to entity framework. Part 2 entity framework code first apporach and change connection string. In my experience, i used the database first mode in ef 6.
Changing entity framework model at runtime benny michielsen. But during further research, i found this page on nortons support site which discusses the different trust levels of networks and mentions that, for the. If user is valid user then i will get the data base connection string of that particular user from data base. If you have visual studio, then you most likely already have sqlce installed. Jun 27, 2012 check that the dropdown is populated correctly. Normally you specify the connectionstring including some metadata about the model in the nfig file.
In the code page for your application, add the following using statements imports in visual basic. Change connection string created by the wizard at runtime. In this article, we are going to focus on the ability to dynamically set the connection string for your entity framework model. You dont need to worry, here is the list of free online tutorials. With codefirst, ef will generate the meta data at runtime. There are several ways by which you can provide the connection string to ef core application. I want to change the connection string parameters that created by entity framework in nfig file in runtime. In this example we have implemented a singleton class to supply the connection string. Change connection at run time entity framework entity framework. Figure 11 shows the choose your database objects dialog box that appears. Dim databasename as string adventureworks initialize the connection string builder for the underlying provider. Sep 17, 2017 mvc using entity framework connection string setup to authenticate sql server remote database of godaddy.1206 53 81 694 1430 76 660 1006 746 67 93 1170 737 1634 229 1609 576 1018 726 949 696 1340 1412 622 1346 49 957 525 1640 1464 1661 1651 314 1613 751 550 1249 1195 16 1343 294 609 68 1214 912 1238