Ef core create table dynamically. Apr 2, 2023 · The above is missing a lot of information.

Ef core create table dynamically 2. Take for example this DbContext: public class StackOverflowDbContext : DbContext { public DbSet<MyClass> Test { get; set; } } Jun 6, 2018 · I have problem on dynamic table or user will create table in the web application and will insert record after. Net Core 3. Please refer below code Mar 15, 2011 · In LINQ to SQL, I can create a repository dynamically using DataContext. public class MyContext : DbContext , IDbContextSchema { private readonly string _connectionString; public string Schema {get;} public MyContext(string connectionString, string schema) { _connectionString = connectionString; Schema = schema; } protected override void OnConfiguring Jun 25, 2015 · Here's a simple solution using a switch to associate a particular Type to a table. Mar 7, 2024 · @Ben EF Core and DbContext are already fully dynamic. I have two potential solutions though. For most of the tables I need a read-only access and I'd like to use a single EF Core DbContext. I want to automatically create the database and tables when the app is first run. May 24, 2017 · Have a requirement to create instance of Entity Framework generated Model class dynamically by passing table name as parameter (Model generated in DB first approach and using EF 6. I want to create a service that has many parameters for sorting and filtering (over 50). var tableName = "Table1"; // Get proper return type. However, not all of the tables reference this single table directly. Mar 7, 2018 · With 20 lines or so of code we’re able to dynamically create a new Type as well as an Expression Entity Framework can use to populate that Type. That holds the mapping Sep 7, 2021 · Entity framework dynamic table name part. Where("Name=@0 And UserName=@1", name, name); } return query; 'System. Open(); // If you want transaction, place it inside the query. Access a Class (dbcontext) Property Oct 18, 2020 · For how to add a new table to the database with ef core code first, you can follow the below steps: 1. Length) . Modified 5 years, Create Table, Run Time using entity framework Code-First. I will look for a WEB API tutiorial, then perhaps marry your code somehow. All in the same step. NET Core will use EF Core with SQLite. NET Core 2. This is the code I am working with so far. But if I were you I'd try to figure out a different way to do it with a static schema. Database has a few methods you can call to manage migrations programmatically. GetType(Assembly. The whole code snippet is the same, except for the table name. Feb 26, 2023 · Method 1: Use EF core to execute the dynamically generated SQL commands. I’m using SQLite, but this should work with any relational database that can store text in a column. Design (this is installing with Package Manager Console): Jun 27, 2015 · I have many tables with the same model structure but with other table names with other data (in this case will be ~100 tables). It's my understanding that EF is static, so all new tables would need to be created through migrations. I will be getting object from gui where these will be filled out and query will be executed from a single service method. As an example, the ASP. Based upon the source, I need to call the different table name and get the records. Currently we have solved this by creating dynamic class at the client side. They need complex filtering and sorting and grouping and other functions, mixed together, to extract data from a relational structure. We are using . Have a think about the last project you worked on: I reckon 95% of you will be thinking about a forms-over-data application. I'm using VS22. It is much cleaner; besides, you can use EF and Dapper in same project side-by-side. Aug 7, 2021 · Dynamic DbSet in Entity Framework Core. May 28, 2015 · Well, its the create table statements out the context. So during runtime I call something like the following code (actually my implementation is a little bit different as I need to choose my database during runtime): var db = new DbContext(); db. Advantages to this approach: Less complexity in database schema design (just another column) Feb 13, 2021 · With previous versions of Entity Framework, you could write a query with just a table name like this: Type t = Type. A DbContext is a multi-entity Unit of Work, not a connection and doesn't deal with tables. Normally during the time you develop your application, you mostly create your entity classes or types at your coding for your database objects and so model your EF Core by the help Jun 14, 2022 · The next step is to set up the conversion as part of the Entity Framework Core configuration. 0) will retrieve the set for you, but you cannot operate on it since it is of type IQueryable and not IQueryable<T>. Jan 17, 2022 · Basically what this code does it applies properties over previous modifying pe variable on every loop creating property chain. If you want to use a different table name specify it with ToTable() Sep 5, 2022 · In earlier version of the product we were calling SP to check for the columns and created them dynamically in table. EF is using LINQ, and the important part of that is IQueryable. Feb 16, 2022 · Thank you for your answer. Name; //Add a table with the name tableName to DbContext } Sep 20, 2022 · Using dynamically created fields or even entities in raw SQL shouldn’t be a problem, but it gets more challenging when working with Entity Framework Core (EF). Linq' allows to predicates from strings. I found this code in some article Jul 26, 2016 · Entity Framework doesn't work well with temporary tables. EntityFrameworkCore. May 14, 2020 · adding new columns to existing tables ; adding new tables; I want to use Entity Framework Core to access such model. For example: public class MyController : Controller { priv My application being ported to . Is there a way to dynamically select the table to which to add a new entity? The code I have thusfar to dynamically create an entity (untested, so I hope): Sep 6, 2016 · I want to change the table name or view name dynamically based on conditions. I want to write a where LINQ query which will filter the table based on those dynamic filtering options. Summary. Tables. Take(model. Aug 11, 2021 · How to handle dynamic tables in Entity Framework. I have multiple tables generated at runtime. EF Core is designed to work with preset schema. EF does not support this complexity of queries. This means an entity and matching SQL statement cannot dynamically be thrown at EF Core at runtime, and have data successfully returned. Mar 29, 2023 · In this article. Oct 9, 2018 · In my DB i've got some tables which are really similar each other, so the idea was to create a dynamic table-update method which would be good for every table, just passing to this method the table name, the ID of the row to update and the JSON containing data to update. My questions: Is this the proper way to create the database dynamically based on EF Core 2. 0) like, // In Oct 3, 2023 · The EF api doesn't contain the add migration command method, since the add-migration command will firstly build the project and then generate the migrate class based on your build well project. Create() that I want, but on a database that already exists with other schema s like [dbo] [b2] [b3] etc. Each db table contains different columns, but are in corresponding order with the Excel columns. Net core 2. I'm able of creating the types for the new tables and fields using reflection but I'm not able of creating the DbSet members inside the DbContext class for these new types as the DbSet needs to know the type at compile time. It's more easy to explain with my following code, where I'm simply trying to apply some filters basing on what i receive in input: Oct 24, 2019 · EF is not made to create temporary tables. I found an interesting approach here enter link description here that allows to dynamically generate an object[] array with the columns to be fetched. GetRelationalModel(). Consider TableTypeDictionary to be a Dictionary<string, Type> mapping DbSet types with their type names. ToTable("Managers") but as the OnModelCreating method is only called once I can't map it to other table names on the fly. For example, using (IDbConnection conn = new SqlConnection(DataBaseConnectionString)) { conn. Aug 2, 2020 · I am using EF Core 3. IndexOf(f)}"; var parameterizedCondition = string. Given your comment: All 3 tables have unique_id field, which I receive from another software. I m using Microsoft approach to create navigation property. 0 Code First and apply migrations? Assuming I have my context: CustomDbContext, and in the Registration Action I have like this: Dec 27, 2024 · We are now transitioning to Entity Framework Core, and I’m unsure how to replicate this dynamic behavior using C#. First create manually mapping table that is also included in ApplicationDbContext like new DbSet Jun 11, 2018 · The way I can imagine to go forward is to not rely on dependency injection, but instead create a dbcontext object on request and dynamically point it to the user's individual database. net core api I am working with connects to multiple databases based on the header metadata on each request. Jul 28, 2019 · Table Per Hierarchy (TPH) Table Per Type (TPT) Table Per Concrete Type (TPC) In EF core only the first one is applicable. I have a method which receives Entity name as a string (along with If you're using a Code First approach then Entity Framework will build the table for you. Net Core and Entity Framework Core. EnsureCreated(); Aug 13, 2023 · In my c# EF Core 6 application I am looking for a solution to dynamically choose the fetched columns in the SELECT statement. Tables in database are dynamically adding and deleting by other script. With the new NET Core feature - collectible assemblies , you can unload an assembly from memory, which helps to avoid memory leaks and performance problems. I used unique flag on that column and it might be a problem if i put all entries to the same table Jun 8, 2020 · The problem with LinqKit and similar packages is that AsExpandable replaces the query provider, which for EF Core is not good in general because it blocks EF Core specific extensions like Include, AsNoTracking() etc. If you wanted to use it in this way you would have to have a static schema determined ahead of time. Empty; //Ensures that the database for the context exists. &quot; + &quot; Jan 31, 2021 · Introduction. Asset Table -> Id, Name, Path, AssetType(Enum -> user, company), ParentEntityId I have Asset table that contains media files for multiple other tables( e. Mar 9, 2023 · The names are already dynamic. There are many tables. Instead, you might want to look at Dapper. Jul 16, 2014 · If now I run a database - table 'Person' is not create. Sep 4, 2017 · I am new to EF Core, and as I tried using it I found out that you need to add migrations for it to create a database from models. Create new entities derived from the original Test class, and use them in your context: Mar 9, 2022 · However 3 tables will have the ability for users to add columns of their own . I learned that one the hard way. Based on the linked question, the code looks for instance like this: May 19, 2019 · Can't there be a mapping of multiple tables (dynamically N tables) to same class. Model. Apr 12, 2018 · The normal method of injecting a DbContext into your Controller works fine, as long as you are doing a small amount of work during an HTTP request. Aug 29, 2018 · How can I create database table using EF Core at run time? 4. NET 5 and EF Core 5. NET platform through discussions and solutions on Stack Overflow. Jan 13, 2014 · In the end, it reduces the final SQL size because EF Core removes all the columns that are not in our column selection. So I'm trying to dynamically access the tables in my context. DbContext:MyContext class:Student. 0. Core for dynamic Query. For example, the following code would not work unless the BlogUrl type has been added as a DbSet to the DbContext. Entity framework core creating additional table columns. Generic; using System. g. Here we use EF Core to easily switch the language that a website displays. Working with Oracle, but think questions would apply generically. How to dynamically change column name on model creating in Entity Framework context class. 0) May 2, 2021 · @Charlieface, this is not the similar question. Mar 14, 2021 · Add the EF Core nuget packages and tools Install the EF Core nuget packages. Skip(model. If you then select for example only 10 columns, the original query for all columns is reduced from 2000 lines of SQL to 30 lines where only the necessary data will be considered. Set<Company> to access the entity set (not query, entity set. . Oct 10, 2020 · Entity Framework Core is primarily concerned with defining and executing pre-defined queries on a DB table, or executing a simple join on two of more tables. Is it possible to dynamically create a Entity Framework Entity Data Model? Persistance datalayer in EF core Apr 28, 2022 · I am creating a procedure that performs a dynamic select of the fields. Aug 30, 2023 · These packages will allow us to use Entity Framework Core, read configuration values from the appsettings. Set<>() or Set provide access to the entities, they don't map them - unless the type is encountered for the first time. DbContext. Apr 24, 2022 · Add table dynamically in Entity framework in MVC. based on Ivans answer this is what i came up with. I needed all tables in one database. My problem is that I can access the Properties… Nov 20, 2020 · Coding Tutorial: The mapping between tables and entities doesn't have to be fixed. NET 8 using Entity Framework Core. In Chen Li example, I was able to fill in the blanks. Define your context and pass the schema to the constructor. a. Introduction Custom database tables let you store additional data in the Umbraco database that you don't want to be stored as normal content nodes. Here are the challenges I'm facing: Dynamic table and column mapping The database table names are not intuitive. Net Framework. The SQL query I want is: SELECT * FROM Users WHERE externalId IN ('1234', '5678'); Models: Aug 6, 2020 · Now we will display in the console the names of the tables from the database, and count of entries in each of them: Using a small amount of code, we can dynamically create an EF Core DbContext Jul 7, 2012 · Ok, I figured out a way of creating the tables and database (not necessarily the best way). 7 Create Table, Run Time using entity framework Code-First The issue here is that EF Core requires the retrieval to be executed off a DbSet. Feb 9, 2022 · I'm working in EF Core 5 with Razor pages connecting to SQL Server and am trying to develop a generic form that handles multiple lookup tables. Image 14. condition, parameterName This tutorial will show you how to get started with creating custom database tables with the Entity Framework Core in Umbraco. edmx). Linq' is available as a nuget package. Source Code: GitHub Jan 11, 2021 · I am working on creating a generic dynamic filter on a front-end table. He I would like to know what is the best way of creating dynamic queries with entity framework and linq. edmx)? If so, you will create your table in the database, then update your data model (. See also Entity Framework 6 Creating Two table from the same entity object. json file, and configure our application using Microsoft’s dependency injection framework. EF Core offers a lot of flexibility when it comes to mapping entity types to tables in a database. 4 Table Per Type Fluent Mapping in Entity Framework. first you must add Class(Student) in MyContext and you replace name Context( MyContext) with your Context and you need Extensions for get TableName and you need System. Exact requirement: I have two tables 'Sample' & 'Sample_History' and I want to acheive somthing like this: Oct 28, 2024 · Database-Update: Applies the migration to your database, creating the necessary tables. I'm trying to make a class to perform a dynamic filters, depending on what parameters I'll send to its "filter" method but I'm facing some difficulties on building my query. As tables are generated at runtime. Entity(Of Person)(). Dec 21, 2020 · And here is how I initialized the DbContext, in "tables" variable I can see the "Article" table added dynamically using context. The column names must be completely dynamic and selected values. Nov 3, 2022 · Thank you both for your quick responses. In this article, we’ve explored how to create a model and map it to a database table in . using System; using System. I wrote, a lot for navigation property I know that does not support automatic lazy loading on EF Core at this time. You might be interested in a little extension I wrote that allows you to convert an object to a dynamic which would allow you to hook into the runtime dynamic binding on each object. Value > 1 is not compiled into a lambda. Source Code: GitHub Jan 12, 2023 · EF uses the IModelCacheKeyFactory to generate cache keys for models; by default, EF assumes that for any given context type the model will be the same, so the default implementation of this service returns a key that just contains the context type. I have the following scoped registration that connects the api to different To add to this, it's not just EF Core. 1 Scaffolding - DatabaseFirst - How to add more tables. I want to change sql connection string in controller, not in ApplicationDbContext. Collections. net core -EF-, that is received tables and columns names from user, and then create SQL query depended on theses inputs, to generate dynamic report, I searched how can create SQL query, but most ways were with one table,, but in my project, there is must multiple tables (inner join),, Dec 29, 2017 · 1st - this is an example, not a solution for your specific problem. E. Aug 7, 2020 · Seems to be an problem of the FromSql method with the string interpolation. Currently I can do something like modelBuilder. Dynamic. 2 Entity Framework Core - Creating a dynamic DbSet Model from TableName. I'm getting the filter conditions in JSON and I'm deserializing it into an object. I`m trying to create a many-to-many relationship. My question is, do we have another option aside from migrations to dynamically create the database on run time just like what it was in EF 6? Thanks. Create a base class and derive from it. public static class ExpressionUtils { public static Expression<Func<T, bool>> BuildPredicate<T>(string propertyName Apr 2, 2023 · Using EntityFramework Core and SQL Server to create a dynamic IQueryable filtering that is not susceptible to SQL injection attacks and resolves in the SQL statement rather than applied after data is returned. 0 and have a requirement to change table name dynamically for which I am thinking to create an extensiion method. EBusiness Database created. 1, C# 8) that is using Entity Framework Core. 1 library I need to access to a MySQL database organized in multiple schemas with tables that can have the same name across those schemas. It looks like the table(s) are created e. Question you marked as similar is about Entity Framework which is different framework than EF Core, Question you marked as similar is about passing values to the stored procedure, where this question about using it with the EF query syntax. I don't see a way to do this via DI (pre EF 5. Where("Manufacturer. In addition to entity types, an EF Core model can contain query types, which can be used to carry out database queries against data that isn't mapped to entity types. It is not the ultimate solution, but it is designed to educate me a bit on how this should work: IList<Model> modelCollection; query = query. NET Core Web API project and I use EF Core 8 as my ORM and SQL Server. Hence idea is to get the instance of the model class and query for clientId. Besides, we don't suggest you do the migrate inside the production environment, since modifying the database may delete previous table which caused data Oct 10, 2016 · Entity Framework 6 - Dynamically creating temporary tables from IQueryable (Part 1 of 2) October 10, 2016 entity-framework, performance 0 comments I'm a huge fan of entity based and result set based relational mapping ( classic ORMs ). foreach (var name in names) { query = query. Controller Name matches Database model names inside DB context. If I change the Person. This becomes even more useful when you need to use a database that wasn't created by EF. Name=@0", "German"); //Doesn't Work query = query. I'm using Asp. Dynamic table name EF CORE 2. GetExecutingAssembly(). public class Author { public int Id { get; set; } public string Name { get; set; } //other properties } Sep 20, 2022 · Using dynamically created fields or even entities in raw SQL shouldn’t be a problem, but it gets more challenging when working with Entity Framework Core (EF). I've updated all references to the "Metadatas" table to "Metadata" in my project. I found this code in some article EF Core 2. Nov 26, 2019 · dynamic table creation - ef core migration. private static string GetConnectionString(string postgreSqlConnectionString) { NpgsqlConnectionStringBuilder Those who want to convert Sql database schema to EF core using dotnet core follow the steps: Run all the commands one after one (first command for those who want to create a new project else you can ignore that and just run other given commands from your project root folder) I tried learning EF on a new project a few years back. var rawQuery = new StringBuilder("SELECT * FROM ItemsTable WHERE "); var sqlParameters = new List<SqlParameter>(); foreach (var f in FilterList) { var parameterName = $"@p{FilterList. Is there a similar way to do this in Entity Framework 4 other than declaring the properties on the specific DbContext? For example: public MyDbContext: DbContext { public DbSet<MySet> MySets {get; set;} } I have these three models: public class Card { public int ID { get; set; } public string Name { get; set; } public string Class { get; set; } public string Image { get; set; } } p Sep 29, 2017 · I m using . Oct 2, 2019 · You can do it by dynamically creating a new type that inherits from DbContext and the use Reflection Emit to add the DbSets to this type. Column names: PL03001 Jun 14, 2022 · With Entity Framework Core, you can use conversion methods to serialize data on writes to the database and deserialize data when reading from a table. Set(Type) is for Framework from what I have read. The idea is each column will have a filter, where you can select values of that column. In my application, the user can design a table via a web interface (table name, column names, column types) that becomes a table in the database once saved. CreateDatabaseScript(); // execute the script on the database db. The project supports several tenants and I need to create the databases at run time and chan Nov 17, 2016 · I have some old tables which I have added them to the project by reverse engineering to use them as code first. 5 Create Tables on runtime in EF Core. netcore 2. Entity framework will process it and create appropriate joins. 2 || Create table dynamically at run time with custom name. I want to dynamically switch table name in runtime using Entity Framework (for example get name table from routing). One thing that horrified me was I found that if you updated the schema of a table, database migrations by default dropped the table and recreated it to apply the changes, losing any data in the table in the process. For example I know the new table which will be created at the run time will have the specific format like below Feb 19, 2019 · Entity Framework (Core) works the following: By creating a DbContext or any class that derives from it, EF Core checks for DbSets and their related classes in the code. Say there's a project that involves a lot of tables, all of which reference a single table that holds a field called group ID. Tables would be generated when the user registers for our service. In OnModelCreating Set the default schema. Where(a => a. "Temporary" has the meaning of "inside one transaction - so inside a query, you create a table, transform it, get some output and delete it. Set(string name) are the only available functions for EF Core. Start) . ? Alternately if a DLL is created at runtime, how can that DLL be loaded dynamically and added to a DBContext? Entity Framework is my first choice of O/RMs. Something like this: public class User { public string Name { get; set; } public int Id { get; set; } } public class Profile { [Key, ForeignKey("User")] public int Id { get; set; } public string Name { get; set; } public virtual User User { get; set; } } public class EFDbContext Nov 4, 2022 · The current . Mar 12, 2014 · I ran into a similar issue when testing JsonResults. While calling get API, the stored procedure responsible was returning all columns and same was displayed on the blotter. The result of CreateDatabaseScript can be executed: // create the database db. Let’s check whether the database is created or not. Two significant issues come into mind: (1) How to tell EF that the model has changed, and (2) How to use the new fields and entities with LINQ. Now we are looking ahead to migrate to EF Core and we are using EF Core to store config information. CreateDatabase(); // grab the script to create the tables string createScript = db. Here, I am using V_OVT_VLD_340B_DNA_CLD or V_OVT_B_table or V_OVT_c_table to get the records. You could also maintain use some sort of Dictionary<string, Type> object. GetBaseQuery is actually a bug. Net Core. So, I want to disable the database create but allow the table create. I assume you're using an Entity Data Model (. Text; namespace MyIdentityModel { public class IdentityRole { public long Id { get; set; } public string Name { get; set; } = null!; public DateTimeOffset CreatedAt { get; set; } public bool Active { get; set; } public bool Enabled { get; set Feb 6, 2015 · I wanted to know if there is any way to create a dynamic table at the run time using entity framework. There are more than 100 tables in database, each having a different structure/schema. table_1, table_2. I am editing my question Aug 29, 2018 · In a . Dynamically access table in EF Core 2. Studied links. I think I haven't explained the issue properly. If you're using EF Core 2. Sep 25, 2018 · . so the modified code from that answer looks like this: Nov 8, 2020 · C# EF 4. – Nov 27, 2017 · The question is similar to this one, but answer does not provide 2 critical things to me:. Function to create table(s) in Entity Framework. In your answer, there is a class RouteBase, but in my case there is no class like that from which I can get the type. Aug 15, 2016 · Your code won't run. Do you just want to create a table at runtime ? That would be something different. It's a bit of a long solution to try and post into a response here, but here's a GitHub link to a working demo of how it can be done - EF Core Dynamic Db Context Jun 15, 2023 · No, you can't map dynamically like that. Oct 28, 2012 · Learn how to create a dynamic table in C# on the ASP. What is a solution to this? Cant create classes. Jan 17, 2012 · TLDR; How do I read data from a table using Entity Framework, when the table name isn't known at compile-time? There is an external system that processes a bulk of information, and then creates a new table for each batch run, and stores some data in that table. NET6, how can columns be mapped in to the DBSet for a table at runtime, without creating a new class file and compiling it into the app. Net 6. Net Core application I'm building. Mar 29, 2023 · I want to build a dynamic report by Asp. Dynamically Instantiate Model object in Entity Framework DB first by passing type as parameter. Format(f. May 6, 2020 · I need sample solution or reference for creating table dynamically in database during runtime using . I want to make a factory class to return DbContext object where table name will be passed as string. Value > 1); The expression x. Manufacturer. Jan 7, 2025 · I use EF Core in order to dynamically create a test database using the entity classes that I scaffold from the productive database. Bringing it all together, we have: // Pull the Apr 2, 2023 · The above is missing a lot of information. could you please suggest. For example: List&lt;Company&gt; items = await entity . Hot Network Questions Feb 2, 2017 · You can use a base configuration class: public abstract class ReplaceableConfiguration<T> : EntityTypeConfiguration<T> where T : Replaceable { public Apr 26, 2019 · How to dynamically change column name on model creating in Entity Framework context class. Jul 26, 2016 · Entity Framework doesn't work well with temporary tables. Dec 8, 2016 · 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. ExecuteStoreCommand Dec 24, 2016 · Based on the user selection, I can return the proper collection for binding. It looks like you are not using Code First, so you will have create the table in the database. 1 Release Candidate 1 available since 7 may 2018, you can take advantage of the proposed new feature which is query types:. GetName(). Jul 10, 2020 · I'm developing an application (. From my research it doesn't appear entity framework supports this feature. Is there a way to accomplish this? I was able to generate a separate database for each of the plugins, but that wasn't quite what I had in mind. According to documentation this is done using manual commands : dotnet ef migrations add MyFirstMigration dotnet ef database update Jul 24, 2013 · You can pass the ConnectionString to this function :. But interested to know is it possible to achieve this without client side code and leverage the EF and SQL Server unpivot. 5. Using EF in . Normally during the time you develop your application, you mostly create your entity classes or types at your coding for your database objects and so model your EF Core by the help Oct 4, 2018 · DbContext. We can even create our model in C# and easily migrate it into DB. Mar 21, 2021 · In EF Core, you create migrations when you are first creating the database and tables and also for any database schema changes. Set<BaseEquipmentType>(); string sqlStatement = $"select * from {tableName}"; IQueryable<BaseEquipmentType Oct 31, 2018 · The file's sheet names correspond to table names in the db. The idea is to pass tableName as string in the method which will return object in EF and we can select/update these records. NET Core EF 2. If you want to create tables with dynamic structures you have to go lower level than EF Core. These entities both are derived from Log entity. Is EF can support this problem ? Example Apr 3, 2020 · I had to construct the predicate for the 'Where' clause dynamically based on User Interface selections. So I have 2 questions: Jun 1, 2021 · When I try to access the returned DbSet the result is exception: Cannot create a DbSet for 'Abc' because this type is not included in the model for the context. I'm struggling to achieve the same functionality in . Set and DbContext. For example: Table names: PL03{CompanyCode}00 or SupplyerManager{CompanyCode}{YearERP}. When you write a Where clause from an IQueryable, for example someQueryable. 0. Knowing this limitation, we will be able to trigger this. Linq. In this specific case it doesn't matter, but in general I would avoid it (or just use Expand() when composing expressions). I'm currently using EF code-first as part of an ASP. You already know which entity you want. My entity class. Dynamically get a DbSet. I want to query them. g user, companies, departments ). I'm working in EF Core 5 with Razor pages connecting to SQL Server and am trying to develop a generic form that handles multiple lookup tables. In case you use fluent config it would be: Nov 12, 2017 · I have an application that when user registers, there will be a new database created for that specific user. when I run migration command I can see the tables in the database: dotnet ef migrations add InitialCreate Oct 1, 2016 · EF Core 6. Create your new table as a model. My problem is that I can access the Properties (column names) of the tables themselves but I can't access the keys of the IEnumerable object Feb 25, 2020 · Realize that EF core requires different types for these, but eventually I'd like to use a generic cast on the data, would make it easier to work with the data. See the class Person as an example: public class Person { public int Id{ get; set;} [Required] public string Name{ get; set;} [Required] Dec 21, 2017 · So I'm having trouble determining how to add tables dynamically in a . ToList() public static string TestMethod() { using (var context = new GenericAppContext()) { string result = string. That happens dynamically based on the mapping information provided by conventions, attributes or explicit calls in OnConfiguring. How i can create a model on runtime without knowing number of columns inputted by user. – Using a code-first approach I'd like to map a single model to multiple table names dynamically. I need the code to work over navigational properties; I am trying to build extension method May 4, 2011 · I'm quite new to Entity Framework and I have a question about filtering data. Dec 13, 2019 · How can we create dynamic complex queries to be translated at runtime and only return a singular scalar value? Update: Real-world requirements are not hello-world examples. I know the schema of the table that I am going to create at compile time since I use Model-First approach of entity framework. Aug 31, 2020 · The link I posted in comments (Dynamically access table in EF Core 2. For example: foreach (var item in collection) { string tableName = "PersonTable_"+item. Name + &quot;. But the table that is being generated in the database is still "Metadatas". Dec 31, 2017 · 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. 'System. NET CORE controller for one of the SQL tables is shown below. Use the following code to get the table columns: For example: get the Movie's columns I want to change the name of one of my tables generated using Entity Framework code first. Entity Framework Core - Creating a dynamic DbSet Model from TableName. Database. Dec 12, 2024 · I'm developing a multi-tenant ASP. The first step is to install the EF Core packages – Microsoft. I would like to filter a table with several filtering options. 1 Create table dynamically within DbContext. You can do more, but that’s its sweet spot - and for good reason. Since asset remain exactly same for all entities it is rational to create it once and define relationships dynamically. – This has been asked before and answered, but for . Method UpdateRecord: Using a small amount of code, you can dynamically create an EF Core DbContext in runtime. I think there could be a better solution for you by using a simple switch and a common interface on entities instead. This optimize also nested selects and joins. I can't make any changes to the DB since it comes from another company. Ask Question Asked 5 years, 2 months ago. No custom data access-code, no mix Apr 26, 2023 · you can use System. public class Database : DbContext { public DbSet < EntityWithJson > EntityWithJsons { get ; set ; } protected override void OnConfiguring Feb 18, 2022 · I have an entity class with 5 properties. Additionally, you can specify a name and data type for the discriminator column and the values to represent each type. Nov 15, 2011 · When defining the DbContext statically with Person, EF will create the entire database and the tables on the fly, which is great. NET Core web application. Origin. 1. MapSingleType(). Probably it will work if you interpolate the string outside the method, as: public async Task<IEnumerable<BaseEquipmentType>> GetNewAvailableEquipment(string tableName) { DbSet<BaseEquipmentType> dbSet = _context. For example, the db contains a garages table, and each garage is referenced by rows in a cars table, and each car is referenced by rows in a tire table. We can write our queries against DB using C#/LINQ. 1. Jan 3, 2019 · You can make the query parameterized, build a list of SqlParameters, and then pass the query and the parameters into FromSql():. GetTable<T>. 2 with angular 8 and entity framework. Core and Add below Extensions. Select( May 27, 2020 · how can I create dynamic table names with the same columns but different table names in C# and EF Core? For example: we would like to create tables for collecting emails with the same table structure just different names so each customer has its own table for storing emails. I have two various Log entities, they are: DiskLog and NetworkLog. SqlServer and Microsoft. It creates a table 'Entities' with fields Id, FirstName, LastName. Name == "German"); //Doesnt Work modelCollection= await query Dec 21, 2018 · I want to make a universal method for working with tables. Jan 31, 2021 · Introduction. Where(x => x. Change Entity Framework Code First Apr 16, 2021 · How to handle dynamic tables in Entity Framework. Apr 26, 2015 · You can create an EF model dynamically using reflection: Is there a dynamic way to specify table in Entity Framework Core in . public class Person { public int Id {get; set;} public string FirstName {get ;set;} public string LastName {get ;set;} } then created in the database two tables - 'Person' and 'Entities'. I have already created the database, but now I want to change the name. table_3, table_N should map to "table" class. For simplicity, we will use two SQLite databases, but any other database server would work just as well. If you absolutely have to, use _conetxt. This will work only for single relations and not for collections. fdx uje cttdp yzsbo fgpi wxexrzr rozpbq mnj hsosyp cgi