How can I write this using fewer variables? 1. I am using the Fluent API of Entity Framework CTP5 to create the model. As a final thought have you considered: 1. With EF 4.1 Fluent Code First, you may inherit tables per type. Creating the master table as suggested by the other commentators as a single table . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Where we can provide fixed string of table name we want to map to. Find centralized, trusted content and collaborate around the technologies you use most. Can FOSS software licenses (e.g. EF Core 2.0/2.1 - How to efficiently handle large, infrequently accessed columns? please reconsider the entity-relation. The plugins to be used are not known during compile-time, only at runtime. table_1, table_2. Thanks for helping me out, I was really struggling with this one. Summary. MVC3 - Sorting db query when using Include, validation filter for inherited property mvc model, Referencing Primary Keys as Foreign Keys in other tables, SQL Server ASP.NET Web App, How to fetch all data using join three tables using Entity Framework, .net Core EF - Dynamically Add to DbSet by string name or type. EF Core allows to map two or more entities to a single row. https://entityframeworkcore.com/knowledge-base/48041821/dynamically-access-table-in-ef-core-2-0#answer-0. Movie about scientist trying to find evidence of soul. I have an entity class with 5 properties. How can I determine the block height on a certain day? Is there any alternative way to eliminate CO2 buildup than by breathing or even an alternative to cellular respiration that don't produce CO2? When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. Connect and share knowledge within a single location that is structured and easy to search. EF core not creating tables on migrate method, .NET Core 2.1 Identity : Creating a table for each Role + bridge M:M table, EF Core is creating table from abstract class, Can i create multiple tables using same model in EF core asp.net, Configuring abstract base class without creating table in EF Core. To test my repository, I created a fake Entity Framework 4.1 DbContext. Use (either in raw SQL, a stored procedure, or in Linq) the **Field1 = filter OR filter = ""** method. Will Nondetection prevent an Alarm spell from triggering? 2 Answers. As an example, the ASP.NET CORE controller for one of the SQL tables is shown below. I want to be able to do db.GetTable("Namespace.MyTable").Where(). Thanks for contributing an answer to Stack Overflow! Is there a term for when you use grammar from one language in another? You can't perform .Where on Iqueriable without generic typing. 36. that might help. or if you were able to develop your own System implementation. In Startup.cs I add both contexts. I tried to Google but haven't found any relevant reference. How actually can you perform the trick with the "illusion of the party distracting the dragon" like they did it in Vox Machina (animated series)? EF Core Power Tools. What is the use of NTP server when devices have accurate time. in my case IQueryable does not contain definition of Where :(, @mzain It doesn't. Once you have the type, the problem is how to get the corresponding DbSet. Since the tablenames are not static and known at build time, I want to add tables to a SQLCe database during runtime. Option 1 - Apply migration using dotnet ef. There will not be any relation with any other entity. @KennetsuRinn thanks for the suggestion. Any reference or tutorial will be helpful. I'm also huge fan of DML based relational mapping ( micro ORMs ). apply to documents without the need to be rewritten? rev2022.11.7.43013. To which I should be able to provide parameter that which table to query on. code first entity framework 4.1 The permission to CREATE DATABASE was refused in the database'master.'. If he wanted control of the company, why didn't Elon Musk buy 51% of Twitter shares instead of 100%? This is the most powerful method of configuration and allows configuration to be specified without modifying your entity classes. Create the database. What is this political cartoon by Bob Moran titled "Amnesty" about? Accepted Answer. To learn more, see our tips on writing great answers. I did it through ADO.NET capabilities provided by EF Core. // Inherits from DBContext, but takes in a generic type T public class . C# is not an interpretative language like JavaScript. Sci-Fi Book With Cover Of A Person Driving A Ship Saying "Look Ma, No Hands! Entity Framework 4.1 Fake DbContext for Testing. table_3, .table_N should map to "table" class. In this example, there will be about 100 tables, all of which have the same model structure but different table names and different sets of data. Why do all e4-c5 variations only have a single name (Sicilian Defence)? I found this answer: https://stackoverflow.com/a/28101268/657477. It includes reverse engineering of DbContext and entity classes from existing databases and SQL Server DACPACs, management of database migrations, and model visualizations. I am storing the table name in a separate table and I want to get the data from this table using the store table name. The plugins are each divided in separate projects and they have have their own DbContext class. and also I need to insert ,delete and update the data in the asp.net mvc or asp.net. Fluent API configuration has the highest precedence and . First you need to get the type of the entity from the name (in case you have the type, just use it directly). Are witnesses allowed to give private testimonies? Once you have the type, the problem is how to get the corresponding DbSet<T>. Once you have the type, the problem is how to get the corresponding DbSet<T>. in that table, I need to create dynamic columns. First I tried to do that by overriding OnModelCreating but I failed. So use direct SQL and use EF to materialize the result into your mapped entity class: var table = context.ExecuteStoreQuery<ResultTableTemplate> ("SELECT . Not the answer you're looking for? But it is not working in asp.net core 2.0. In the details of below shown code section, the storage of the . One cannot create a class, a concreate type, dynamically at runtime. Dynamically build the query string and execute it directly. Any way around this? How to bind input fields to two different models? I want to also be able to select the table by name. Accepted Answer. Not the answer you're looking for? Cant create classes. The simplified version of that table would be: create table Subscriptions ( Id, CellPhoneNumber, ServiceId, Date, ActionId ) And these can be records: John,+1-541-754-3010,15,2019-10-13 12:10:06.153,1 John,+1-541-754-3010,15,2019-10-18 12:10:06.153,2. You have to implement such (DEL,ADD,CHANGE) methods for each table : . rev2022.11.7.43013. Find centralized, trusted content and collaborate around the technologies you use most. How can you prove that a certain file was downloaded from a certain website? How to create a table corresponding to enum in EF Core Code First? For the purpose of this post, we're going to discuss option (1). but I need to create my database/tables on runtime. Why was video, audio and picture compression the poorest when storage space was the costliest? How to create table columns dynamically in entityframework. trying looking into 'custom claims'. Accepted Answer. Bring the data down to the client, and filter it there. public class MyContext : DbContext { protected override void . Why are standard frequentist hypotheses so uninteresting? In EF Core 6 is it possible to take an IEntityType and get a DBSet to work with, Get ConnectionString from appsettings.json instead of being hardcoded in .NET Core 2.0 App, ASP.NET Core 2.0 authentication middleware. How to deal with ASP.NET Core 2.0 Chunked Web Api Call with EF Core, EF Core 2.1.2 and .net core 2.0 - Linq2Entities causes 'must be reducible node' error. The first one contains information about users (including the db scheme they should address), the second one contains user-specific data. EF Core currently does not provide non generic . [AttributeUsage (AttributeTargets.Class)] public class PersistentAttribute : Attribute { } Now you can add some logic to the OnModelCreating method of your context to scan assemblies and add any classes with the [Persist] attribute as shown below. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Beyond that, if existing tables never need to be modified, then you could look into using context.GetService<IRelationalDatabaseCreator>().CreateTables().You might need to create a temporay DbContext containing just the new entity types so EF . There are many tables. Apply the database migration to create the database. (clarification of a documentary). Fetch the connection string with ConfigurationBuilder. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Handling unprepared students as a Teaching Assistant. For those of you like me reading this question now and on newer versions of Ef Core you can just do the following (ef core 5): To subscribe to this RSS feed, copy and paste this URL into your RSS reader. How to rotate object faces using UV coordinate displacement. No overload for method 'Set' takes 1 arguments. Dynamic entity results Projected entity. All the options have merit, depending on the use case. How can I create a database and tables at runtime using Entity Framework 6? I created one table EmpTable. 12th December 2021 In EF 4.1, how can I foreach through my dbcontext entities? asp.net core, Ef core : Dynamically map repository and services in run time, Using DataTable as a Table Valued Parameter in EF Core 2.0, Eager Loading "No coercion operator is defined between types" after .NET Core/EF Core 2.0 Upgrade, Error adding new migration EF Core 2.0 on ASP.Net Core 2.0, EF core 2.0 one to many share the same table, Add pre-existing table to code-first migration in EF Core 2.0. It might be possible to have the base tables all inherit from a virtual base class which would help a bit - you could then create a dictionary which the base class could use to switch the final data source on the fly. var result = db.Database.SqlQuery<YourModel> (string.Format("SELECT * FROM 123-asd-45 ", tableName)); [AttributeUsage (AttributeTargets.Class)] public class PersistentAttribute : Attribute { } Now you can add some logic to the OnModelCreating method of your context to scan assemblies and add any classes with the [Persist] attribute as shown below. How to get DbSet dynamically in EF Core 3? All the LINQ extension methods are defined for. @Dharmendra Kumar if you would have to persist to do that, you could create custom Attribute class in which might to save table name, override OnModelCreating funtion in which might to query table name from Attribute class and create new table. 503), Mobile app infrastructure being decommissioned, 2022 Moderator Election Q&A Question Collection, How to get DbSet from entity name in EF Core / .NET Core 2.0, Dynamically Instantiate Model object in Entity Framework DB first by passing type as parameter. For instance: foreach (var item in collection) { string tableName = "PersonTable_"+item.Name; //Add a table with the name tableName to DbContext } Ok that will work, but How could we reflect the created table on our backend, I mean adding Entity and creating class on backend ? Dynamically get a DbSet by Entity class name, How to use the where clause with IQueryable. No, that I know about in EF Core and non Core, and in general with.NET an Object Oriented language, one cannot create a DBSet object dynamically during runtime. Does subclassing int to forbid negative integers break Liskov Substitution Principle? @Guerrilla How does this work great? What is the rationale of climate activists pouring soup on Van Gogh paintings of sunflowers? As part of .NET 6, Entity Framework Core introduced migration bundles and support for temporal tables. But you can still get the corresponding DbSet as IQueryable by either using some EF Core internals: or (preferable) invoking the generic Set method via reflection: In both cases you can use something like this: EF Core no longer has a non generic Set method but This extension class makes it easy to query your table based on a string using dynamic linq. You can use reflection for that, but probably the correct way for EF Core is to use FindEntityType method. Consider TableTypeDictionary to be a Dictionary mapping DbSet types with their type names. Now in EF Core I thought that there would be a method like "UpdateDatabase" where you can just add tables to the existing database, but I was wrong. As tables are generated at runtime. E.g. How to rotate object faces using UV coordinate displacement. You could use the following; however, because it loses the database when the model is changed, it's unclear if it will function in a production setting. You know the table name and you know the table structure - it is fixed. A planet you can take off from, but never land back. Space - falling faster than light? you could create table group & table group-person-relation. ", Replace first 7 lines of one file with content of another file. Can you please help me this. Stop requiring only one assertion per unit test: Multiple assertions are fine, Going from engineer to entrepreneur takes more than just good code (Ep. Stack Overflow for Teams is moving to its own domain! Covariant derivative vs Ordinary derivative, Concealing One's Identity from the Public When Purchasing a Home. FROM " + tableName); The disadvantage is that you cannot use Linq in this approach but your requirement is not very . how to verify the setting of linux ntp client? When I try to create a database script using dotConnect for Oracle 6.0.70.0 and .NET 4, the result is an empty string. You can override the OnModelCreating method in your derived context and use the ModelBuilder API to configure your model. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Can you say that you reject the null at the 95% level? Is this at all doable with EF, or do I need to use some other method to make these? 2. I am using System.Linq.Dynamic.Core to dynamically add in lambda expressions to queries in EF. Now it is time to define the types and properties that have been created by Reflection Emit. This works great. Did the words "come" and "home" historically rhyme? Get monthly updates by subscribing to our newsletter! Why are UK Prime Ministers educated at Oxford, not Cambridge? Source code in GitHub. Is it possible for a gas fired boiler to consume more energy when heating intermitently versus having heating at all times? @HGMamaci I've edited the answer to cover your question. Return Variable Number Of Attributes From XML As Comma Separated Values. EF Core currently does not provide . Is this meat that I was told was brisket in Barcelona the same as U.S. brisket? EF Core Power Tools is a Visual Studio extension that exposes various EF Core design-time tasks in a simple user interface. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. When the migration is complete, you will access your Teams at stackoverflowteams.com, and they will no longer appear in the left sidebar on stackoverflow.com. 503), Mobile app infrastructure being decommissioned, 2022 Moderator Election Q&A Question Collection, Dynamic Controls in a Strongly Typed View (ASP.NET MVC). EF Core can read and write entity instances from/to the database, and if you're using a relational database, EF Core can create tables for your entities via migrations. For this table only, not using entity framework. How do I utilize migrations on a production database prepared using Entity Framework 4.1? If you want, I can send you the code. Aug 30 2018 2:11 AM. Asking for help, clarification, or responding to other answers. Including a DbSet of a type on your context means that it is included in EF Core's model; we usually refer to such a type as an entity. Get monthly updates by subscribing to our newsletter! Type returnType; switch (tableName) { case "Table1": returnType = typeof (Table1EntityType); break; case "Table2 . For this scenario, I would suggest you use direct SQL and use EF to materialize the result into your mapped entity class (code as below) if you know the table structure. I am using Entity Framework Core 6.0.2. I know I can use the following command to add a new migration and create the database : dotnet ef migrations add MigrationName -c DbContextName dotnet ef database update -c DbContextName. ObjectContext vs. dbContext in Entity Framework 4.1, DbContext Override SaveChanges to Audit Property Changes in Entity Framework 4.1. Use fluent API to configure a model. Currently onmodelcreating we are using fixed string method named "toTable". 2 Responses to "Dynamic Database Creation in Entity Framework" Gerhard Sommer Says: January 4th, 2011 at 11:35 am. How can I create database table using EF Core at run time? if not, I think you could use ado.net to work around. ASP.NET Core 1.0 upgrade to ASP.NET Core 2.0 Upgrade Authentication in ConfigureServices - How do I use Fields in Core 2.0? Any reference or tutorial will be helpful. Did find rhyme with joined in the 18th century? You can use reflection for that, but probably the correct way for EF Core is to use FindEntityType method. Use the database. public class DynamicDbContext<T> : DbContext where T:class { public DynamicDbContext ( [NotNull . How to understand "round up" in this context? Create database migration. Are witnesses allowed to give private testimonies? In the following code, the type of domainObject varies (but ends with DO, which I trim then to get the corresponding table name).Having the name of the table and its type, I want to update an existing object - its name is the same as the tableName due to the EF - in the database with the new property values from domainObject.Therefore, I have to find the POCO in the table with the same ID . Shared-type entity types. EF Core 6 new features and changes for .NET 6 Check out what's new in EF Core 6. How to set dynamic entity to dbcontext Entity Framework Core? It's fantastic that EF will automatically generate the complete database and the tables when the DbContext is defined statically with Person. What are the weather minimums in order to take off under IFR conditions? Add a design-time context factory. Code First allows you to define your model using C# or VB.Net classes. 3. 2.Entity Framework is not designed for DDL, it's an ORM tool for data access. Option 2 - Apply migration from the code. This video and step-by-step walkthrough provide an introduction to Code First development targeting a new database. Can an adult sue someone who violated them as a child? myDbContext.Set<T> (); And so a simpler design is to just use a single generic type that you specialize at runtime with the dynamic entity type. This scenario includes targeting a database that doesn't exist and Code First will create, or an empty database that Code First will add new tables to. It's fantastic that EF will automatically generate the complete database and the tables when the DbContext is defined statically with Person. EF Core 6.0.2 || Create table dynamically at run time with custom name, Entity Framework Code First - Changing a Table Name, Create Table, Run Time using entity framework Code-First, Stop requiring only one assertion per unit test: Multiple assertions are fine, Going from engineer to entrepreneur takes more than just good code (Ep. Do we ever see a hobbit use their natural ability to disappear? We cannot really get around this requirement - EF Core always need the entity be added as a DbSet, however what if it was added dynamically at runtime? MIT, Apache, GNU, etc.) Get monthly updates by subscribing to our newsletter! I came across an issue with this method. I cannot use DbSet I must use DbSet it says in error message. 3.If you want to interact with a table with a dynamic name or at run time, then you need to choose "classic" ADO.NET. Why bad motor mounts cause the car to shake and vibrate at idle but not when you give it gas and increase the rpms? Dynamically access table in EF Core 2.0. First you need to get the type of the entity from the name (in case you have the type, just use it directly). I tried to Google but haven't found any relevant reference. 4.But you have options to change mapping of existing tables at run time in EF--with regards, Edwin To use table splitting the entity types need to be mapped to the same table, have the primary keys mapped to the same columns and at least one relationship configured between the primary key of one entity type and another in the same table. First you need to get the type of the entity from the name (in case you have the type, just use it directly). ASP.Net Core: Get User Roles with LinQ Select method. EF Core 2 tries to create same table twice, EF Core: Update-Database command not creating user tables. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. In this article. See the class Person as an example: My requirement is: when an admin creates a group and provides the name, I have to create a new table with the above model class' columns with the name as provided by the admin. public class MyContext : DbContext { protected override void . Yes,you can do that. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. @gordon-matt It seems like using Migrations at runtime, which if I remember rightly is what Rowan does in his post, could be a reasonable approach here. A fixture is made up of a home te With Entity Framework 4.1 and DbContext, I attempt to do the following: This fails to execute when attempted with the following error: The model for the current context does not include the entity type Person.. Is it feasible to create a DbSet (together with its schema) in the database and then add it to the DbContext without at runtime? So if admin enters a name like DelhiPerson, then a table should be created in the database with name DelhiPerson with the same columns as shown in the above Person class. Stack Overflow for Teams is moving to its own domain! Other scripts dynamically add and delete tables from the database. You could also maintain use some sort of Dictionary<string, Type> object. Yes,you can do that. interface Data.Entity.IDatabaseInitializer, https://entityframework.net/knowledge-base/8138070/csharp-ef-4-1-create-table-dynamically-within-dbcontext#answer-0. ASP.NET MVC: How to display strongly typed view model, containing list of items, which also contain list of items? var tableName = "Table1"; // Get proper return type. The first issue to resolve, is the ability to populate an entity without having a Dbset added to the DbContext for the entity. I am not able to include nested entities as there is no definition for Include(). What is this political cartoon by Bob Moran titled "Amnesty" about? Implementing OnContextCreated for auditing by assigning SaveChanges an eventhandler using EF 4.1 DBContext. public void ConfigureServices (IServiceCollection services.AddEntityFrameworkNpgsql () .AddDbContext<SharedDbContext> (options => options.UseNpgsql (Configuration . For EF Core: 3, 5, 6. I have an entity class and using that class to fill data and get data from it. Here we can see that John has subscribed to service 15, and has remained in it for 5 days, and . This is called table splitting or table sharing.. Configuration. Here's a simple solution using a switch to associate a particular Type to a table. Why are taxiway and runway centerline lights off center? Entity Framework 6 - Dynamically creating temporary tables from IQueryable (Part 1 of 2) I'm a huge fan of entity based and result set based relational mapping ( classic ORMs ). Connect and share knowledge within a single location that is structured and easy to search. Once you register the types in OnModelCreating, you can get the DbSet's with simply. 2) Introducing the types to EF Core. In general I'm a huge fan of every technology that allows me to get the job done in the best possible way. Making statements based on opinion; back them up with references or personal experience. I'm trying to create a fixture table which will have two foreign keys to the team table. EF Core currently does not provide non generic Set(Type) method similar to EF6, mainly because there is no non generic DbSet class. Using Entity Framework, I want to dynamically change the table name during runtime (for example get name table from routing). Should I use lambda or LINQ for a multi-table join in Entity Framework 4.1? eg. You can use reflection for that, but probably the correct way for EF Core is to use FindEntityType method. https://entityframeworkcore.com/knowledge-base/38532764/create-tables-on-runtime-in-ef-core#answer-0. So if admin enters a name like DelhiPerson, then a table should be created in the database with name DelhiPerson with the same columns as shown in the above Person class.
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