Just look your database again. How to create and add initial data row to new table using Entity Framework 6 Code First migrations C# Entity Framework : Rename table field without losing data, using automatic migrations Change types for both. The Index() action returns all of the movie records from the Movie database table by taking advantage of the Entity Framework. This is not the case when configuring the migrations history table. This is entity framework tutorials series part-5 . You just need to override the OnModelCreating method and use fluent API to configure the table. While using this site, you agree to have read and accepted our terms It will change generated entity class name without changing the database table nama. Notice that a safelist is supplied to specify the exact properties to update. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. 43,737 Solution 1. This has changed in Entity Framework 6 however and the migrations history table is no longer marked a system table. Manually edit the Up and Down methods of the migration to use the RenameColumn method to replace the AddColumn and DropColumn that it automatically generates for you. This should result in adding to the database a migrations history table configured according to the details you specified in your HistoryContext derived class. You can open the Entity Designer at any time by double-clicking the MoviesDBModel.edmx file contained in the Models folder within the Solution Explorer window. of use and privacy policy. Just look your data in database with old field. Without lost our data we achive it. The constructor initializes a class-level field named _db. SQL Script: Rename Table in MySQL, PostgreSQL, and SQLite ALTER TABLE Employee RENAME TO Emp; Finally, we used the Entity Framework to insert, update, and delete database records. is it possible to change table name after compiled? Unix to verify file has no content and empty lines, BASH: can grep on command line, but not in script, Safari on iPad occasionally doesn't recognize ASP.NET postback links, anchor tag not working in safari (ios) for iPhone/iPod Touch/iPad, Adding members to local groups by SID in multiple languages, How to set the javamail path and classpath in windows-64bit "Home Premium", How to show BottomNavigation CoordinatorLayout in Android, undo git pull of wrong branch onto master, EF database first, rename entity table name, Navigate to your entity under YourModel/Entity Types, right click on your entity on the design pane + Properties from context menu. Listing 4 contains two new controller actions named Edit(). Entity Framework Migrations APIs are not designed to accept input provided by untrusted sources (such as the end user of an application). In order to use theMoviesDBEntities class in the Home controller, you must import the MovieEntityApp.Models namespace (MVCProjectName.Models). For example, you can build your MVC Model classes using other O/RM tools such as Microsoft LINQ to SQL, NHibernate, or SubSonic. The ToList() method is used to convert the set of movies into a generic collection of Movie objects (List). Entity Framework : A Comprehensive Course. tricks on C#, .Net, JavaScript, jQuery, AngularJS, Node.js to your inbox. DataAnnotations is used to configure the classes which will highlight the most commonly needed configurations. You could achieve this by creating the following class derived from HistoryContext: C# If you want to rename an entity class, you can double-click on the class name in the Entity Designer and enter a new name (see Figure 6). The _db field is an instance of the MoviesDBEntities class that was generated by the Entity Designer. Let's start building our Movie Database application by creating a page that displays a list of movie records. Notice that the second Add() action is decorated with the AcceptVerbs attribute. Follow these steps. Because we will use this class to represent a particular Movie instance, we should rename the class from Movies to Movie. The Edit view, contained in Listing 5, includes a hidden form field that represents the Id of the database record being edited. Otherwise, the controller action will not know which record to update in the underlying database. The view in Listing 2 contains a foreach loop that iterates through each movie record and displays the values of the movie record's Title and Director properties. Enable-Migrations and Update-Database detailed explanation, here. The following two statements do the very same thing: Use whichever LINQ syntax method syntax or query syntax that you find most intuitive. Next, the Add() action performs some simple form validation. . You can follow almost the same approach to edit a database record with the Entity Framework as the approach that we just followed to insert a new database record. In this tutorial, you learn how to use ASP.NET MVC with the Microsoft Entity Framework. Figure 5 The ADO.NET Entity Data Model Designer. If you want to extend the functionality of the entity classes defined in the Designer.cs file then you can create partial classes in separate files. You learned how to build an application that enables you to select, insert, update, and delete database records. . Use the sp_rename built-in stored procedure to rename a table in the SQL Server database. You can take advantage of the Visual Studio Entity Data Model Wizard to generate an Entity Data Model from a database automatically. Don't modify the code in the Designer.cs file since your changes will be overwritten the next time you use the Entity Designer. It overrides the default convention in EF 6 and EF Core. There are several alternatives to the Entity Framework that you can use with ASP.NET MVC. If I understood question correctly OP wants to use, in database tableName = dvtable_5b607ffc_7ea2_47b1_90d4_bb72a0fe7280, in db.Context i want use tableName = Persons instead dvtable_5b607ffc_7ea2_47b1_90d4_bb72a0fe7280. We'll create a Movie Database application that enables you to display and edit movie database records. More info about Internet Explorer and Microsoft Edge, Right-click the App_Data folder in the Solution Explorer window and select the menu option. The following LINQ to Entities statement grabs the first database record that matches a particular Id: Next, the TryUpdateModel() method is used to assign the values of the HTML form fields to the properties of the movie entity. The Wizard created a new data access class named Movies. The HistoryContext class is derived from the DbContext class so configuring the migrations history table is very similar to configuring EF models with fluent API. At the moment there is no built-in support for changing the database schema at runtime. Finally, the user is redirected back to the Index view. TutorialsTeacher.com is optimized for learning web technologies step by step. If you don't like writing/changing the required code in the Migration class manually, you can follow a two-step approach which automatically make the RenameColumn code which is required: Step One Use the ColumnAttribute to introduce the new column name and then add-migration (e.g. And Add new Rename Column part and change old name to newName. Alternatively, you can change the name of an entity in the Properties window after selecting an entity in the Entity Designer. The Index() action in Listing 1 uses LINQ method syntax to retrieve the set of database records. In order to illustrate how you can use the Microsoft Entity Framework with ASP.NET MVC, we'll build a simple sample application. , table: "tablename", newName: "newname", schema: "schema"); Ishika Jain 717. score:4 . How to rename a database column in Entity Framework 5 Code First migrations without losing data? After you complete these steps, the ADO.NET Entity Data Model Designer (Entity Designer) opens. Figure 1 Creating a new Entity Data Model, Figure 4 Choose Your Database Objects. Expand the MoviesDB.mdf database connection, right-click the Tables folder, and select the menu option. The second Edit() action attempts to update the database. https://entityframework.net/knowledge-base/28015771/renaming-dbo-aspnetusers-table#answer-0. If it is not your application may break at runtime or behave in unpredictable ways. The final database operation, which we need to tackle in this tutorial, is deleting database records. This tutorial assumes that you have Visual Studio 2008 or Visual Web Developer 2008 with Service Pack 1. Coding example for the question How to rename a database column in Entity Framework 5 Code First migrations without losing data?-Entity Framework. Rename a property or give an alias name in Entity Framework? Open Entity Model Browser; Navigate to your entity under YourModel/Entity Types; right click + Properties; You can chance entity type name here; Or using designer: right click on your entity on the design pane + Properties from context menu ; Change Name property value; It will change generated entity class name without changing the database . Listing 1 Controllers\HomeController.cs. EF6 Onwards Only - The features, APIs, etc. More info about Internet Explorer and Microsoft Edge, You need to change names and/or facets of the columns to enable a 3, You need to use a non-default schema for the __MigrationHistory table, You need to store additional data for a given version of the context and therefore you need to add an additional column to the table. Add-Migration ColumnChanged) Listing 3 contains two new actions added to the Home controller class that you can use to insert new records into the Movie database table. Migrations history table is a table used by Code First Migrations to store details about migrations applied to the database. The second Edit() action starts by retrieving the Movie record from the database that matches the Id of the movie being edited. The view in Listing 2 is used to display the movie records. In addition your DBA would like you to rename the MigrationId column to Migration_ID. In the Table Designer, add the Id, Title, and Director columns. Add new column for names and keep it unique and indexed. In other words, the Wizard gave the class the very same name as the database table. This action can be invoked only when performing an HTTP POST operation. EntityFramework.dll Represents renaming an existing table. The Home controller in Listing 1 exposes an action named Index(). In order to use the Entity Framework, you need to create an Entity Data Model. This will configure the migrations history table in the default way which you then tweak in the overriding method. In this video, I am going to show you, How to change Database table name in ASP.NET CORE. Different databases support the different syntax to rename a table. c#.net entity-framework entity-framework-5. Just run your migration. Make sure that the original table name is correct, and the new name has not been used with other database objects; otherwise, it will raise an error. You can use the Entity Framework to make it easy to insert new records into a database table. One to many relationship between AspNetUsers (Identity) and a custom table, Invalid object name 'dbo.AspNetUsers' in Asp.NET MVC 5 Entity Framework, How to map AspNetUser table id as foreign key to another table. Accepted Answer The database needs to be updated. or is it possible to make the table name to read from an Appsettings from .config file? Let's say you want to rename the migrations history table and put it to a custom schema called "admin". If there are no validation errors then a new movie record is added to the Movies database table with the help of the Entity Framework. The view contains a form for adding a new movie database record (see Figure 8). In this part we will see how to update entity data model based on database changes like add a new table in. 2. Now, to the code. There is no difference in performance between the two approaches the only difference is style. You learn how to use the Entity Wizard to create an ADO.NET Entity Data Model. You could achieve this by creating the following class derived from HistoryContext: Once your custom HistoryContext is ready you need to make EF aware of it by registering it via code-based configuration: Thats pretty much it. In addition your DBA would like you to rename the MigrationId column to Migration_ID. Next, you learn how to use LINQ to Entities to retrieve a set of database records from a database table. This article assumes you know how to use Code First Migrations in basic scenarios. Finally, if there are no validation errors, then the underlying Movies database table is updated with any changes by calling the SaveChanges() method. However unless you're also renaming the column in the database you'll need to add a ColumnAttribute to the property specifying the real DB column name. When editing database records, you need to pass the Id of the record being edited to the controller action that performs the database update. The TryUpdateModel() method takes the fields in the FormCollection passed to the Add() method and assigns the values of these HTML form fields to the Movie class. If either property is missing a value, then a validation error message is added to ModelState and ModelState.IsValid returns the value false. Zzz-19 and Zzz-23 explain the database-first technique using the Asp.net Identity Entity Framework, which is not exactly simple. If you are using an earlier version, some or all of the information does not apply. discussed in this page were introduced in Entity Framework 6. and Update-Database Step 3. Writing our model classes and configurations is the goal of the EF code first method, and if we make changes, we use EF migrations to update the database schema. First, we discussed how you can use the Entity Data Model Wizard to generate an Entity Data Model from within Visual Studio. The expression _db.MovieSet represents all of the records from the Movies database table. update-database Step 4. Now you can go to the Package Manager Console, Enable-Migrations, Add-Migration and finally Update-Database. Invalid object name 'dbo.EdmMetadata' and 'dbo.__MigrationHistory', Migrating to Asp.Net Identity 2.0: new columns not being created in AspNetUsers table, ASP.NET Identity remove column from AspNetUsers table, AspNetUsers' ID as Foreign key in separate table, one-to-one relationship, InnerException : Table 'xxx.aspnetusers' doesn't exist. Remember to save your Entity Data Model after making a modification by clicking the Save button (the icon of the floppy disk). If input is accepted from such sources it should be validated before being passed to these APIs to protect against SQL injection attacks etc. Over the course of this tutorial, we build a web application that illustrates how to select, insert, update, and delete database data by using the Entity Framework. detailed explanation, here. You can use the controller action in Listing 6 to delete a particular database record. Double-click the MoviesDB.mdf file to open the Server Explorer/Database Explorer window. Step 2. Notice that an Edit and Delete link is displayed next to each record. You can view these classes by opening the MoviesDBModel.Designer.cs file from the Solution Explorer window. Behind the scenes, the Entity Designer generates a set of C# classes. The new record is added to the database with the following two lines of code: The first line of code adds the new Movie entity to the set of movies being tracked by the Entity Framework. You need Service Pack 1 in order to use the Entity Framework. The second Add() action creates a new instance of the Entity Framework Movie class with the help of the ASP.NET MVC TryUpdateModel() method. You have 2 options: 1. The Microsoft Entity Framework is an Object Relational Mapping (O/RM) tool that enables you to generate a data access layer from a database automatically. If you're doing Database First and are using the EDMX designer then you must use the designer to rename the column. Step 1. Right-click the App_Data folder in the Solution Explorer window and select the menu option Add, New Item. The database needs to be updated.Enable-Migrations The action verifies that both the Title and Director properties have values. When using the Entity Framework, you must supply a "safelist" of properties when using the TryUpdateModel or UpdateModel methods to update the properties of an entity class. SQL Script: Rename Table in MySQL, PostgreSQL, and SQLite. Next, some simple validation is performed to verify that both the Movie Title and Director properties have values. Post Views: 2,649 SQL - Rename Tables in the Database Different databases support the different syntax to rename a table. The Table attribute can be applied to a class to configure the corresponding table name in the database. The Movie Database application uses a database table named Movies that contains the following columns: You can add this table to an ASP.NET MVC project by following these steps: After you create the Movies database table, you should add some sample data to the table. Typically when you configure EF models you dont need to call base.OnModelCreating() from the overridden OnModelCreating method since the DbContext.OnModelCreating() has empty body. I want use human names in code. Use the following ALTER TABLE RENAME script to rename table names in the MySQL, PostgreSQL, and SQLite database. How to rename a database column in Entity Framework 5 Code First migrations without losing data? First, you will need to create a class derived from System.Data.Entity.Migrations.History.HistoryContext class. The first Edit() action returns an HTML form for editing a movie record. In Entity Framework 5 this table was a system table if the application used Microsoft Sql Server database. Types should match.
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