Dbcontext database sqlquery not found. Jan 31, 2025 · Set Up EF Classes To work with a table in a database, you need to add EF into your project and set up an entity class to map each field in your table to a property in a class. Oct 11, 2019 · 11 I had similar issue with dbContext. EF Core Raw SQL Query Entity Framework Core is an Object-Relational Mapping (ORM) framework for . Dec 22, 2020 · 183 My command keeps timing out, so I need to change the default command timeout value. SqlQuery (Entity Framework 6. ConnectionString Or with Entity Framework 6: this. NET layer. Jul 18, 2024 · I tried re-generating just to see if there is any difference and I noticed that the DBContext doesn't have any parameterless base constructor anymore? Would you know how to automatically add it when re-generating the classes? Aug 24, 2013 · DbContext class is the one among others that the Entity Framework team has created, in order to facilitate developers when accessing and manipulating database data. The type does not have to be an entity type. Those entities need to be configured, preferably as DbSet properties in the DbContext object. Sequences. For example, if the object class is defined as: Oct 26, 2024 · Currently I am going to add my first migration. Jun 20, 2020 · One thing I am missing in EntityFramework Core is a way to run raw SQL queries and map the results to a class, just like the EntityFramework 6 DbContext. Product. Cheers! In this tutorial, you will learn how to use the EF Core ExecuteSQLRaw() method to execute a raw SQL statement. This method returns an integer specifying the number of rows affected by the SQL statement passed to it. Jun 27, 2013 · DataContext. Null is returned if the entity is not found in the context or in the database. Database property. SqlQuery<return Datatype>("name", parameter) but, when i want to execute a stored procedure with no parameters and receive data, how to do that i try dataContext. Let me explain the scenario in detail. Any parameter values you supply will automatically be converted to a Dec 10, 2018 · 0 I've been googling this for a bit but I haven't found anything useful regarding the differences between DbContext. No errors either. LINQ queries can be written using query this. net Core project. Nov 12, 2024 · Patterns for creating and managing DbContext instances with or without dependency injection Nov 27, 2024 · Context When using EF Core together with Sql Server, we catch exceptions from the database (mostly SqlException s) and convert them to domain-specific custom exceptions. SqlQuery("StoredProcedureName @ParamName", new SqlParameter("@ParamName", paramValue); If you use the first syntax, EF will actually wrap your arguments with DbParamater classes, assign them names, and replace {0} with the generated parameter name. I'm your scenario, a null value would indicate something that you couldn't find, so return a 404 - Not Found. Async operations are important for keeping a responsive UI in rich client applications, and can also increase throughput in web applications where they free up the thread to service other requests in web applications. SQL queries for non-entities are created using the System. e. Now, EF 6 provides the DbContext. Oct 18, 2018 · 'DatabaseFacade' does not contain a definition for 'SqlQuery' and no accessible extension method 'SqlQuery' accepting a first argument of type 'DatabaseFacade' could be found (are you missing a using directive or an assembly reference?) Jun 8, 2015 · please extend DbContext. NET Framework that provides query capability against collections in C# or VB. Data. I have a MSSQL stored procedure that returns me output value. Most commonly it is used with any TextWriter by setting it to the “Write” method of that TextWriter. ExecuteSql The ExecuteSql method in Entity Framework Core (EF Core) allows you to execute raw SQL We would like to show you a description here but the site won’t allow us. Database Sep 13, 2023 · Update: Since you have a firm reason for wanting to preserve the original database as much as possible, recreating a project is no longer an option for you. Oct 14, 2020 · Querying and Finding Entities in Entity Framework 6The Find method on DbSet uses the primary key value to attempt to find an entity tracked by the context. 0, but I can't figure out how to do so. Find(cartID); // here check. The only method I've seen to build a raw SQL query in Entity Framework Core is via dbData. If you want to call a stored procedure from a DbContext put the code in the DbContext class itself and use its built-in methods to execute SQL queries instead of going through the database connection. The idea is to introduce introduce a separate single-entity DbContext type for each ad-hoc query type. Any parameter values you supply will automatically be converted to a DbParameter. I found only 1 way in which such queries work, but it is not recommend Oct 16, 2023 · Navigations are not supported when using 'SqlQuery". SqlQuery<Student Apr 8, 2016 · When using DbContext. I'm currently using . config file can be a normal database connection string (not a special Entity Framework connection string) in which case the DbContext will use Code First. See System. Instances of this class are typically obtained from Database and it is not designed to be directly constructed in your application code. NET's job. What's reputation and how do I get it? Instead, you can save this post to reference later. For custo Jan 24, 2024 · I am transforming some functions to their asynchronous version, I am using the SqlQuery method, but these asynchronous versions hang. Aug 10, 2022 · Entity Framework Core allows us to drop down to raw SQL queries when working with a relational database. SqlQuery<myEntityType> ("mySpName", param1, param2, param3); At first I tried using `SqlParameter` objects as the params but this didn't work and threw a `SqlException` with the following message: > Procedure or function 'mySpName' expects parameter '@param1 Apr 14, 2012 · It is a DbContext ( sorry, it did not realise that Entity Framework could have different things - I am obviously new to this game). this. In Java/Hibernate, equivalent behavior can be achieved by setting the property hibernate. Jan 16, 2019 · I am using ASP. ExecuteSqlRaw () and it has been fixed by installing package Microsoft. DataBase. May 25, 2021 · check = dbcontext. Possibly like using a factory to create instances on the fly. SqlQuery<YourEntityType>("storedProcedureName",params); But if your stored procedure returns multiple result sets as your sample code, then you can see this helpful article on MSDN Stored Procedures with Multiple Result Sets Jul 10, 2019 · I have a stored procedure that has three parameters and I've been trying to use the following to return the results: context. System. SqlQuery but my colleague is using . Please find the code for the player class. Dec 21, 2022 · In function execution calls of dbContext. Apr 6, 2017 · So, in this case I need to use SqlQuery either off DbContext. Does knowing it is DbContext mean you can help me? Aug 4, 2018 · You can't execute SqlQuery in EF Core, it requires to define a POCO class and a DbSet for that class. How can I set the command timeout in Entity Framework 5 ? Dec 9, 2020 · SomeMethod is using a global DbContext instance that's already been disposed. Address#Address'. SqlQuery<SomeModel> ("Raw The type or namespace name 'DbContext' could not be found (are you missing a using directive or an assembly reference?) The type or namespace name 'DbSet' could not be found (are you missing a using directive or an assembly reference?) Jun 24, 2020 · I am working on a ASP. In this approach, you reverse-engineer a model from an existing database, resulting in the generation of an EDMX file that contains the model definition and mapping information. I've found myDb. So why on earth would you want to execute raw SQL? For small projects it's much simpler to write a small query, than fiddling with abstractions like May 18, 2018 · In Entity Framework 6, I can execute a raw SQL query on the database using the following command: IEnumerable<string> Contact. This is exactly what Dapper offers out of the box, and it's good to see EF Core catching up. a Full Text Search), if the generated SQL is not efficient enough, if you want to make use of existing stored procedures, or if you just prefer to write your own queries in SQL. So just add an extension method like this: public static class SqlQueryExtensions { public static IList<T> SqlQuery<T>(this DbContext db, Func<T> targetType, string sql, params object Jun 23, 2023 · EF generally does not support nullable keys: if you look at the database schema created from your model, you'll see a NOT NULL column for SecondID even though the . Additionally, add OSS project Dapper for extra goodness. In EF Core you can use FromSql, FromSqlRaw or FromSqlInterpolated Apr 15, 2023 · EF Core is getting many new and exciting features in the upcoming version. Tooling support for the EDMX file was dropped in Entity Framework Core in favor of using commands to reverse-engineer class files May 30, 2014 · The right tool to use here is the SqlQuery method (also available from the Database property of the DbContext object). SqlQuery<T> method. Mar 7, 2024 · public Address? Address { get; set; } public required Customer Customer { get; set; } } Now when I run the command Add-Migration, I get the following errors: Unable to create a 'DbContext' of type ''. Data querying in EF Core is performed against the DbSet properties of the DbContext. g. DbSqlQuery for a non-generic version of this class. Mar 31, 2025 · What problem are you trying to solve? I would like to have value type support. Is it possible to return a result from SqlQuery as Dictionary of key/value or DataTable? Jan 7, 2020 · You can also query types not registered in your DbContext. In addition, you need to create a DbContext class, add a connection string to point to your database table and configure some DbSet properties in your DbContext class. An instance of DbContext represents a session with the database which can be used to query and save instances of your entities to a database. DbSet in Entity Framework Database First Approach with Examples In this article, I am going to discuss DbSet Class in Entity Framework Database First Approach with Examples. The source for this content can be found on GitHub, where you can also create and review issues and pull requests. The DbSet represents a collection of entities of a specific type - the type specified by the type parameter. It may not be the zero-width space causing the problem, but it couldn’t hurt to take a look at the table definition (ie. It reads like I need to create a new dbContext each time I want to query the database. Upvoting indicates when questions and answers are useful. SqlQuery to support dynamic type for map query to a list of dynamic objects. 0) This is the SqlQuery method found in Entity Framework 6. Second, Please click EF Designer from database and click Next. LINQ queries against a DbQuery<TQuery> will be translated into queries against the database. SqlQuery () The SqlQuery method on DbSet allows us to write and execute Native SQL query in Entity Framework that will return entity instances. Entity Framework Core does not have this and the only alternative is 4 times the amount of code. FromSql("SQL SCRIPT"); which isn't useful as I have no DbSet that will map the rank I return in the query. Jul 15, 2014 · Migrating an Entity Framework project from ObjectContext to DbContext, I have found no means to execute an E-Sql query string directly with DbContext. ArgumentException: The specified type ' Asynchronously executes the given DDL/DML command against the database. SqlQuery not returning list of objects i declare Asked 10 years ago Modified 10 years ago Viewed 5k times Oct 20, 2019 · Can EFCore run raw Query useing context. Currently you get this Unhandled exception. DbContext in EF Core allows us to perform the following tasks: Manage database Jan 30, 2017 · I can get a valid DbContext and write into the database so everything has been setup correctly. Plus it provides mechanisms for executing raw SQL queries directly against the database using ADO. Forgetting to catch an exception could result in a 500 - Internal Server Error, which is a catch-all status when something catistrophic happens in your application (like a bug). Prior to EF 6, we used the database tracing tool or a third-party tracing utility to trace database queries and commands sent by Entity Framework. Database. Connection. The latter uses Database. May 29, 2019 · When I save changes to DbContext, it doesn't update my database. I mean everything we usually used do not work: dbContext. 1. title FROM a JOIN b ON b. SqlQuery<myEntityType>("mySpName", param1, param2, param3); At first I tried using SqlParameter objects as the params but this didn't work and threw a SqlException with the following message: Procedure or function 'mySpName' expects parameter '@param1', which Sep 15, 2025 · Entity Framework 8 has a new feature that allows you to execute raw SQL queries against the database and return results as unmapped types. Finally, we could see the generted code Jul 25, 2022 · The DbContext. SqlQuery is not available. The following example demonstrates executing a raw SQL query to MS SQL Server database. Executes the given SQL against the database and returns the number of rows affected. For an introductory comparison of these two techniques, see the Overview page on saving data. SqlQuery (sql) get a wrong result 1. DBContext class is used to interact with the database. The results of this query are never tracked by the context even if the type of object returned is an entity type. Please note the lines Aug 4, 2016 · Discussion on the issue of SetCommandTimeout not working for connection. NET standard, EF Core provides asynchronous counterparts to all Feb 16, 2023 · Now I am not 100% sure of what that means exactly, but I do not think getting a dbContext for the life of the 'UserControl' in this instance is shortlived. . Sep 14, 2020 · Summary It is not only possible but also surprisingly easy to run any SQL on the database with Entity Framework Core 5. Feb 2, 2011 · I have a stored procedure that has three parameters and I've been trying to use the following to return the results: context. SqlQuery<> functions with npgsql, but have error. Jun 4, 2011 · With the release of Entity Framework 4. 0 Nov 21, 2019 · @nmess88 - The reason that your attempt to retrieve the data again from the database is showing "Inactive" is because that DbContext is still tracking the reference to the entity that you modified. SenderId IN (SELECT FollowingId FROM Feb 11, 2025 · 0 I've got a case where I run a query using my DbContext, and then I need to run a raw SQL query to retrieve some related data from elsewhere. The following example returns all the students from the database. Dec 11, 2021 · Dynamic Context (for Entity Framework Core) A guide to returning projected, anonymous and simple type values dynamically Published on Saturday, 11 December 2021 May 18, 2021 · ExecuteSqlRaw returns the number of rows affected by the SQL command, and not its result - see the API doc page. I think one solution you can take at this time is the CodeFirst migration of EF Core, which will generate corresponding entity classes and relationships between entities based on your database. ExecuteFunction. Given that you don't want any mapping capabilities, what exactly would EF be adding over ADO? Perhaps providing an example code snippet would help. For example, the results Entity Framework Core provides the DbSet. Sep 13, 2019 · In this article we look at how to run SQL Server queries with Entity Framework Core using the DbSet. For more information, see our contributor guide. EF doesn't currently have a direct way of executing a raw SQL query and retrieving a result which isn't an entity in the model (for that, see raw SQL queries). Now i know that i can run raw sql in entity framework by following var students = Context. Jan 23, 2023 · Using DbContext. So to solve your problem you can just remove the NotMapped attribute since you're selecting the CustomerName from the database. Valid operations are INSERT, UPDATE, and DELETE. Types that are not part of your Database model While the current EF version already supports that you can write your own SQL queries with FromSql<TEntity> and its variants, this method only works with types that are part of your database model. NET 7 platform. All code mentioned here can be found on my GitHub, feel free to experiment with it. In a nutshell, DbContext, DbSet,… Dec 26, 2021 · To support this, I have found no other way but to manually create the SQL, and use the demoContext. May 26, 2023 · You can also compose LINQ operators over your SQL query. SqlQuery vs ObjectContext. Which to use depends on what exactly you want to do. Mar 4, 2021 · Learn how to utilize SQL with your Entity Framework Core 5 DbContexts and entities. Note that the current ExecutionStrategy is not used by this method since the SQL may not be idempotent and In this article, I will discuss the DbContext Class in Entity Framework Core. The following is our . Feb 10, 2016 · I migrate my application to ASP. Either include this type in the model and use 'FromSql' for the query, or ignore this property using the '[NotMapped]' attribute. json: "DbConnectionString": "Server=s;Database=db;Trusted_Connection=True;", 2) Read the line in you Startup. Hello, How to do a simple sql query withing the dbContext. In that project, I need to execute an SQL string query and retrieve the result to a custom model. BeginTransaction (), use dbContext. Sep 16, 2022 · If you were using string interpolation, as in $"DELETE FROM {variable}", then you were using dynamic SQL and parameters which does not work since "databases do not allow parameterizing column names (or any other part of the schema). Query<Ques Provides access to database related information and operations for a context. EF is an ORM, not a data access library or driver, that's ADO. SqlQuery<string>(testQuery); is expected a single string value per row so the following query would satisfy this setup select 'HITHERE' as firstval When you set a property as [NotMapped], you're telling EF to ignore the field when getting data from the database. " Logging Database Commands in Entity Framework 6 Here, you will learn how to log commands & queries sent to the database by Entity Framework 6. ExecuteFunction, so got curious as to why would one be used over the other. I have a need to execute raw SQL query. show_sql=true. and here is the code: string UserId = "a5bddfc0-ee0d-4d33-b384-60629154aad9"; using DBContext db = DbFactory. This is the SqlQuery method found in Entity Framework 6. But there are cases where using raw SQL statements are useful, or even necessary. However, since your SQL becomes a subquery whose output column needs to be referenced by the SQL EF adds, you must name the output column Value. Mar 21, 2024 · In this Azure tutorial, we will discuss fixing the error, the type or namespace name ‘dbcontext’ could not be found, which I got while working with the Azure Function Project. After searching I found the way by casting DbContext into ObjectContext and setting value for CommandTimeout property of objectContext. You can include parameter place holders in the SQL query string and then supply parameter values as additional arguments. NotSupportedException : Invalid setup on a non-virtual (overridable in VB) member: x => x. try install-package Microsoft. Yes, the connection string is correct, I know this because I'm able to ret Mar 31, 2017 · Generally you are going to want to read it from config at start-up, and then use the connection string to configure an Entity Framework DbContext service for your process. In this week's newsleter, I'm going to cover how to use EF Core for The DbContext exposes a Database property which includes a method called ExecuteSql. net framework 4. NET Core 2. When I write Add-Migration initialMigration I get following error: More than one DbContext named ' Jul 6, 2017 · I want to get Count of row from in a function that send the DbContext and Dbset instance to it as below : public int GetRowCount(DbContext DatabaseContext, DbSet TableEntity) Aug 11, 2015 · context. [GetAge] @age int AS SELECT Name from Employee where Age>@age RETURN 0 Second, Please add a new item called ADO. Single(); 2 Reply Automatic-Deal-8268 OP • 2 yr. May 8, 2025 · The `DbContext` and `Database` classes form the core API foundation in Entity Framework 6, providing the primary interface for applications to interact with databases. ) method, to extract the data - which work fine in my first test. FromSql("SELECT * FROM Books"). SqlQuery<> (. Open() inside a try statement. EntityFrameworkCore. Please read our previous article where we discussed DbContext in Entity Framework. Nov 21, 2017 · In Entity Framework, there is a method to execute a query against the database and return a specified object type. Database, called SqlQuery, lets you pass in a raw SQL query to get scalar data directly from the database. SecondID == null) can never return any values and EF translates it to WHERE 1=0. May 6, 2020 · The Database class represents the underlying database and provides various methods to deal with the database. To execute raw SQL that's not tied to a model, use the Database property off you DbContext dbContext. Description I have two database tables have not any association: msystems id name 1 sys1 2 sys2 3 sys3 4 sys4 flows id name 1 flow1 2 flow2 3 flow3 4 flow4 Now, I need get a one lin May 20, 2022 · CREATE PROCEDURE [dbo]. Entity. Note that this method does not start a transaction. EF7 introduced support for returning scalar types using SQL queries. Log property can be set to a delegate for any method that takes a string. ExecuteSqlCommand() or context. When calling SqlQuery, you also specify the class to be used with the results of your query. May 8, 2023 · ExecuteUpdate and ExecuteDelete are a way to save data to the database without using EF's traditional change tracking and SaveChanges () method. DbContext. Database? So we can select query with return data type c# maybe dateTime, or string or int, or Guid? Feb 3, 2015 · To use SqlQuery, just assemble your SQL statement as a string and then pass it to the SqlQuery method (SqlQuery is available from the Database property of your Entity Framework DbContext object). If the entity is not found in the context then a query will be sent to the database to find the entity there. NET Core. The output value is of int type. This approach worked fine for most cases, however when we execute a stored procedure via a call like DbContext. I want to log all the SQL queries executed by the Entity Framework DbContext for debugging/performance-measurement purpose. Queries are specified using Language Integrated Query (LINQ), a component in the . Each would be initialized and cached seperately. Posts. However, there might be times where you just want to execute a raw SQL query to return some arbitrary shape that is not necessarily part of your EF entities, i. 1. Log property to log the SQL generated by DbContext. The query is not executed when this object is created; it is executed each time it is enumerated, for example by using foreach. While googling, I can see that the extension SqlQuery was changed to Sep 8, 2017 · I want to execute an SQL command from Entity Framework Core 2. 1 So I tried this: db. Following the . SqlQuery<T> and the SQL itself is quite complex. If you’ve ever encountered a situation where you need to fetch generic objects from a SQL Server database using table names and object IDs in an ASP. Jan 3, 2014 · You can call a stored procedure in your DbContext class as follows. The Log Jan 2, 2018 · You'll need to complete a few actions and gain 15 reputation points before being able to upvote. SqlQuery<TElement> (sql,params) with a generic type Asked 2 years, 7 months ago Modified 2 years, 7 months ago Viewed 402 times Apr 10, 2019 · The worst case, I may try to create a transaction outside and, do NOT use dbContext. Status = 10"); On a new project, I am trying to use Entity Framework Core 2. Entity Framework allows you to achieve this by creating a context – with behavior defined by your tests – that makes use of in-memory data. To use this method with a transaction, first call BeginTransaction(DatabaseFacade, IsolationLevel) or UseTransaction(DatabaseFacade, DbTransaction). x allows you to execute the raw SQL query for the underlying relational database using SqlQuery () and ExecuteSqlCommand methods. Previous versions of Entity Framework support a Database-First approach to development. DbContext is a combination of the Unit Of Work and Repository patterns. If you are using Entity Framework and you just need to run an odd query that doesn't match any entity, you can do so through the context Database property. The exception 'No suitable constructor was found for entity type 'Account. SqlQuery, which was available from the DbContext's Database object, allowed you to submit any SQL statement to create any set of objects you wanted. CreateCommand() in Entity Framework Core, with steps to reproduce and insights. With the SqlQuery method, you must specify the stored procedure's return type, in addition to providing the name of the stored procedure to execute and any required parameters. Nov 5, 2014 · I am using entity framework 5. Typical code looked like this: var cNames DbContext in Entity Framework Core The DbContext class is an integral part of the Entity Framework. Third, Please choose database and click Next. Sep 1, 2022 · When writing tests for your application it is often desirable to avoid hitting the database. Cart. Entity Framework 6. Jul 7, 2021 · However, calling DbContext. Apr 12, 2019 · 总结：以上的SqlQuery和ExecuteSqlCommand方法均是DbContext对应数据库实例的方法，如果是执行原始的未经处理的SQL语句时，请一定注意SQL注入攻击等安全性问题！ Sep 24, 2023 · Dynamic SQL Query for Retrieving JSON Objects in ASP. A DbQuery<TQuery> can be used to query instances of TQuery. NET Core application, you might have found it challenging Aug 8, 2022 · But I am very kindly being informed that: 'DatabaseFacade' does not contain a definition for 'SqlQuery' and no accessible extension method 'SqlQuery' accepting a first argument of type 'DatabaseFacade' could be found (are you missing a using directive or an assembly reference?) I am using System. 0 with . 0 code first approach. Where(z => z. for example: Jun 3, 2015 · When i call a sp using EF with return data i use dataContext. Can you provide a solution that works with both the mapping you laid out and SqlQuery? Nov 15, 2022 · The SqlQuery is a method for entity framework (EF), and it does not belong to EF Core. Originally we were doing this as a try / catch inside an override of SaveChangesAsync in our DbContext. Entity Framework Core provides mechanisms for executing raw SQL queries directly against the database in circumstances where you cannot use LINQ to represent the query (e. Creates a raw SQL query that will return elements of the given type. SqlQuery () returns a value of any type. NET features. Infrastructure. When I run the test I am getting this error: Message: System. ago Jan 8, 2025 · A new method of DbContext. - The reason why I need to, is that I want to delete all data from a database table, and using Mar 9, 2023 · This behavior is by design. NET Entity Data Model to my project. This page explains how these com Apr 12, 2018 · It's critical to understand that FromSql is much more limited than SqlQuery in terms of what it can return. As the docs explain, when you compose LINQ operators over your SQL query, EF must know what the column name is that's coming out of it - your SQL query is integrated as a subquery in the larger query. Nov 28, 2018 · You would use methods of context. Note that the connection found in the app. 1) Add a line to your appsettings. Database. Oct 24, 2021 · In this previous post, I showed how to execute raw SQL query using EF but it requires the entity to be defined and to be accessible via DbSet. It takes 2 parameters effectively doing a BETWEEN operation. I tried different usage options, but every time I get an error related to the parameters. The type can be any type that has properties that match the names of the columns returned from the query, or can be a simple primitive type. The result is a collection you can process using LINQ. It allows you to bypass the LINQ query pipeline and execute custom SQL. GetDbConnection(). Find is different from using a query in two When using Abp, this means I have to create a new repository and add this method inside to call the Stored Procedure using SqlQuery. SqlQuery<T> the following exception: 'The element type 'MyEntity' used in 'SqlQuery' method is not natively supported by your database provi Jul 28, 2022 · This code, the ViewModel type and the path DAL\Concrete\TaskRepository. 6. 0. FromSqlRaw(@$"SELECT * FROM Posts AS P WHERE P. You can execute SQL on a database level, but when you care about the result, you need to add a DbSet representing your results. I need to get the Connection from the DbContext because I have to test for it at application starting using a connection. It sounds like you want EF to do something here. LINQPad automatically refreshes the schema explorer and autocompletion cache whenever the assembly changes. Why is this not available? How do to it? Regard Jun 13, 2025 · Asynchronous operations avoid blocking a thread while the query is executed in the database. SqlQuery<int>("--SQL GOES HERE"). FromSql method, parameterized queries, stored procedures and using the Database. Yes, the incoming form data is filled. ExecuteSqlCommand property. Mar 29, 2011 · 2) Pass DbParameter subclass arguments and use @ParamName syntax. It provides an abstraction over the underlying database so that you can write code that is agnostic to the database management system being used. quantity still equals 9, but the back-end database table shows quantity = 10; In the code comments, when I say "back-end database table shows quantity = xx", i am referring to a SQL query i do direclty on the database with Sql Server Management Studio. -1 is the expected value for queries, which don't affect any rows. Stored Procedure: CREATE procedure… Jul 1, 2022 · I need to execute SQL Command in MS SQL, which is already connected via EF Core 6. SqlServer without even using the package. DbContext. NET Core 2023-09-24 Learn how to retrieve generic objects from SQL Server using table names and object IDs in ASP. ExecuteSqlCommand () DbSet. FromSql() method to execute raw SQL queries for the underlying database and get the results as entity objects. SqlQuery(). Add using Microsoft. First thing I found is: Execute RAW SQL on DbContext in EF Core 2. SqlQuery<TElement>(String, Object[]) results in an exception with the following message: The SqlParameterCollection only accepts non-null SqlParameter type objects, not SqlParameter objects. NET that allows you to interact with your database using C# code instead of writing raw SQL queries. SqlQuery<T> function, which allows to run custom SQL queries directly on the underlying database context. (Entity-SQL is not SQL, but a SQL like query language, see this msdn reference). SqlQuery () DbContext. Entity as the docs say. context The SqlQuery method in Entity Framework Core is used to execute raw SQL queries against the database and return the results as scalar values as result. NET property's type is string?. Jan 23, 2018 · @mrlife As you point out, ADO is the currently recommended way of doing this. ConnectionTimeout, but it's readonly. Nov 28, 2023 · #DBContext. Database or DbSet because I need to use custom sql to get the components out. SqlQuery<T>() method. As such, the query ctx. Example below. cs suggest there's a "bit" of confusion around ORMs, EF Core and application layers. May 11, 2012 · I am looking a way to set CommandTimeout for DbContext. My question is, the result I am returning is not and wont be mapped to any entity. Why is this not available? How do to it? Regard Nov 1, 2020 · Summary If the database says it can’t find a column and you don’t see any typos in your SQL query, you may just have a hidden character in a column name. But, the DbModel that should be used, is created with one naming convention for the C# class and another naming convention for the table column. If there is not a valid connection, the console app should try to start MySQL Server and retry. CreateDbContext(); var result = db. EF works with entities, not presentation-level viewmodels. Fourth, Please choose the table and the stored procedure and click finish. SqlQuery<string>("SELECT a. The methodDatabase. To use this feature, use the new SqlQuery method on the Database property of your DbContext instance. Oct 14, 2020 · The results returned from SqlQuery on Database will never be tracked by the context even if the objects are instances of an entity type. Then you can use it like: using (var context = new SampleContext()) { var books = context. Try this code sample below. SqlServer in your current project. That gets you to the ADO. Executes the given DDL/DML command against the database. And now we're getting support for querying unmapped types with raw SQL queries in EF8. aId WHERE b. NET 7 console project along with entities and a context (SchoolDbContext) class. Nov 20, 2024 · Currently, Entity Framework does not support using tuples as the generic type in the DbContext. query the INFORMATION_SCHEMA. SqlQuery to get a custom object (not entity), it seems all the object's writable properties should be found in the sql query result columns or the IndexOutOfRangeException will be thrown. cs class (after the Startup method is called to build the Configuration - so . config or web. var Creates a LINQ query based on a raw SQL query, which returns a result set of a scalar type natively supported by the database provider. Books. What would be the return value of your statement? Nov 21, 2017 · In Entity Framework, there is a method to execute a query against the database and return a specified object type. I tried to retrieve the query result using context. You don't need a mapped entity to capture the results. As with any API that accepts SQL it is important to parameterize any user input to protect against a SQL injection attack. COLUMNS table) to find out. UseTransaction (OutsideTran) instead and see if it will work or not. EntityFrameworkCore at the top of the code file. Oct 19, 2024 · The key difference between attempt 1 and this attempt is using SqlQuery here which EF Core will parameterize values sent to the database while attempt 1 used SqlQueryRaw which does not parameterize values sent to the database. This limitation makes it challenging to execute SQL queries that return columns that do not directly map to entities or predefined models in the code. ToList(); } The Database property and SqlQuery method are not marked as virtual so they can't be mocked (using Moq; you could use a different library that can account for this but that may be more inertia than you'd like). 1, the DbContext. Use the SqlQuery(String Oct 15, 2021 · 'DbSet' does not contain a definition for 'ExecuteSqlCommand' and no accessible extension method 'ExecuteSqlCommand' accepting a first argument of type 'DbSet' could be found (are you missing a using directive or an assembly reference?) Mar 7, 2023 · The recently released Entity Framework Core 7. 0 offers a new DatabaseFacade. The method is not used for returning entities. The returned objects will be tracked by the context. without throwing a exception the application is simply close Jan 6, 2025 · Hi gents, can you sort out the following for me. 2 days ago · No, not really. Here you will learn the overview of working with the DbContext to create a database and interact with it using EF Core 7 on the . so, my question is, how to execute a sp if there are results The FromSql method in Entity Framework Core is used to execute raw SQL queries against the database and return the results as entities. 2, EF Core and MOQ. SqlQuery() method offers a way to execute a SQL command then map the returning result set to a strongly typed object or a list of strongly typed objects. Since you're simply returning a number, EF can't build the lasfinitem model sand throws an exception. Entities. ConnectionString Additional Notes You can return to Visual Studio at any time and rebuild - LINQPad will not lock your assemblies. SqlQuery<return Datatype>("name", null) but gives me a error: "The value cant be null". NB: You can easily integrate ADO usage with EF, take a look at the DbContext. Database like context. Id = a. May 31, 2024 · I try use context. NET MVC Core and Entity Framework Core and i found problem. The results of a LINQ query against a DbQuery<TQuery> will contain the results returned from the database and may not reflect changes made in the context that have not been persisted to the database. I have raw SQL query to entity like this var rawSQL = dbContext. aiy cnmg ruq wsod cqnjz lnznil wpob ihuty bxrxcf gkj