Ef core executereader. I'm calling a Stored Procedure in EF Core 2.
Ef core executereader EntityFrameworkCore. 4. This is a sample from Entity Framework Core allows you to drop down to SQL queries when working with a relational database. In EF Core 6 you can map a sequence and use it on a mapped entity. net framework从datareader获取分页数据到datatable 如果 HasResult 为 false，EF 将照常继续。 如果 HasResult 为 true，则 EF 将禁止其将要执行的操作并改为使用 Result 。 对于未尝试更改结果的任何侦听器，此方法的正常实现是返回 result 传入的值，通常使用 FromResult<TResult>(TResult) 实现 with EF Core code first, no idea why. Visual Studio creates a project that uses the Entity Framework Core with ASP. is limiting the time of executing the SQL query (imagine some super complex SQL command with many Entity Framework Core coupled with stored procedures for SQL database data retrieval encounters a constraint: consistent return of all columns required for DbQuery<T> properties. Issue is reproducible using: EF Core v3. This is the rough code. 8. ExecuteSqlCommand() 但是，这两种方式都有局限性： 1、FromSql方式 I installed Entity Framework Core 7. 0: execute stored procedures and mapping result into a list of custom objects. net-mvc-routing; or ask your own question. Query<Ques When working with Dapper and EF Core there is no need to be concerned for the most part with data types as both currently support common column types and . ExecuteReader() . Sequence mapping. DbContextOptions. I have managed to generate the context and class files based on an existing database. Let’s write the interceptor to look at the ReadCount of any DataReader created by EF Core. Add a comment | 1 Answer Sorted by: Reset to default 3 . You have kinda turned this into an XY problem but for binding data to a GridView you should use a DataTable and a SqlDataAdapter. In one of my previous posts, I detailed how the EF API can be used to retrieve column mappings public Microsoft. NetCore. 7. 51, as 5. 3 and Entity Framework Sql Server 7. 下面是一些用于运行原始SQL的扩展方法的DbContext和DatabaseFacade对象。在Database. For an introductory comparison of these two techniques, see the Overview page on saving data. Kris van der Mast. I have multiple db operations in each transaction. SQL queries can only be used to return entity types that are part of your model. In ASP. 18 and v3. public static string conString = ConfigurationManager. 0; concepts are similar in 2. Net Framework 4. Users The issue is a blocking one for me as I have to execute some ADO. To make the model having default schema, an overriding for OnModelCreating event is needed:. The interceptor works as expected for single inserts or updates, but I get an exception when the command contains updates to two related entities. Insert a new client and its address (SUCCEEDS) var entity Thanks to Eugene for putting me on the right track. Contains(a. NET MVC, ASP. My issue was that I was getting an exception like fx. Entity Framework 7 (Core): DataReader must be closed exception. GetInt32(0); } But it would be nice to posted on January 2, 2017 by long2know in ASP. 0. SqlClient 2. RelationalDataReader ExecuteReader (Microsoft. EF Core - System. ExecuteSqlCommand<DateTime>("SELECT CURRENT_TIMESTAMP FROM DUAL"). Note: This is VS2015 RC. have can i get db. 1. I have this problem: I have to read records from a stored procedure: In this article. First thing I found is: Execute RAW SQL on DbContext in EF Core 2. SQL queries can return regular entity types or keyless entity types that are part of your model. 11. ExecuteReader to retrieve rows from a In this article, we explore both existing and custom options to run row SQL in EF Core, but focus more on extension method implementations using ADO. Data. The starting point for all DbContext configuration is DbContextOptionsBuilder. A DbContext is neither thread-safe nor meant to be long lived. Net Core application with entity framework core. Name) creates an IEnumerator which keeps the connection open, when it try to . NET. I am using entity framework for most of my code, but i also need to execute and return a count or columns from a sql table that is not within my entity framework context. In EF Core 3 and above, you can now configure this via connection string. EF Core 5. 1 that work correctly but in . Which means, just for sure, never use it in multiple threads anyway, even if they don't run parallel. Entity I'm trying to create a DbCommandInterceptor that logs the results from the database after any command is executed. Where(x=>x. ToList(); Using Net Core 3. Specifically, reference type like string in . net core 2. NET, Entity Framework. EF Core takes a lot of time, sometimes, to perform SELECT query. #35097. Rendimiento mejorado en TechEmpower Fortunes. posted on January 2, 2017 by long2know in ASP. Linked. productTypeId && c. CloseConnection); then by disposing the READER, the connection will be closed. entity-framework-core; sqlexception; Share. 0 and back to 4. InvalidOperationException' in System. In Microsoft. Close ();} Using this code the command is already configured with transactions, etc. Ex. GetClaimsAsync(role) again. Entity. public class EmployeeContext : DbContext { public Possible duplicate of EF Core - System. ProjectId; var locationParam = new SqlParameter("@ lauxjpn changed the title System. The connection's current state is Connecting. 267. 0 introduced ExecuteUpdate and ExecuteDelete, which made it possible to express efficient bulk becasue_roleManager. EF isn't a database driver, it's an ORM and works at a higher level than the CRUD data access objects people mean when they talk about That entry is missing from the EF Core 7 version. This post focused on a shortcut methods like ExecuteSqlCommand() and ExecuteSqlCommandAsync() and also took raw Well, one problem is that if . Net. Net EF Core 3. Full Log Output - EF Core 6 That's a good bare-bones pattern for those of us who have given up hope that EF Core will give Stored Procedures first-class-citizen support to Entity Framework, and who don't want to have to trawl through countless wrappers and libraries just to get execute a simple procedure. 9 still reproduces the issue. The IQueryable<> variable has deferred execution, therefore internally, EF will only make the call to the database when the IQueryable<> is iterated over (i. I implemented support for the In today’s . Other types, like the Guid UserId property, are automatically converted to strings. saleYear) . . On updating to EF Core 9, those do not default if there is an implementation of IDesignTimeDbContextFactory. ConnectionStrings["dbConnection"]. dm_db_partition_stats st " + "WHERE object_name(object_id) = 'MyLargeTable' AND(index_id < 2)"); The only problem is that the return value isn't the result of the query, but You might want to consider switching to using TransactionScope which is then used implicitly for all commands within it. XyzAsync() method is only useful if you either await the called method or return control to a calling thread that's doesn't have context in its scope. private async Task<IEnumerable<TEntity>> InvokeStoredProcedureAsync(string entityName) { var storedProcedureName = There are multiple ways to execute raw SQL commands using Entity Framework Core. 6k 8 8 gold badges 30 30 silver badges 58 58 bronze badges. load(reader) then you have to switch the framework out of 5. Failed executing DbCommand (12ms) [Parameters=[], CommandType='Text', CommandTimeout='30'] CREATE TABLE [ProductSubCategory] ( [ProductId] int NOT NULL, [SubCategoryId] int NOT NULL, CONSTRAINT ExecuteReader requires an open and available Connection. 1 and System. Command) Creating DbCommand for Vea Announcing Entity Framework Core 6. Entity Framework: Calling 'Read' when DataReader is closed I am getting this problem intermittently when i pound my service with parallel asynchronous calls. Core项目的帮助程序类 EfSqlHelper. This uses a stored procedure which returns back most of the properties of a database table defined by entity framework. – Ivan Stoev. I'm using . Now, run the application, and you should get the ASP. Commented Aug 25, 2019 at 12:41. Ultimately I couldn't use the method of registering an object to be disposed for me, because it happens too late in the process and I am cleaning up my database transaction in the OnResultExecuted method of my ActionFilter. 0. GetString(1), an Index out of bounds exception occurs. With the release of . app dependencies. Follow asked Sep 24, 2016 at 18:17. I worked fine the first time, the database file got created in c:\users\username\AppData\Local\Packages\PackageId\LocalState . 0 Preview 5: Compiled Models (Anuncio de Entity Framework Core 6. NET 7 / EF Core. Existing Options. and ExecuteScalar / ExecuteReader instead of ExecuteNonQuery), there won't be a need of writing such user code. Follow edited Oct 4, 2023 at 8:55. Follow edited Oct 5, 2020 at 15:38. net core的描述是这样的：This API supports the Entity Framework Core infrastructure and is not intended to be used directly from your code. Hot Network Questions Nintendo Switch no longer charges What does "My Heart Burns Like Fire" mean? How to tell the difference between an F2, and an F16 Trying to identify The value is not overridden, but you have wrong expectation of what it does. NET Framework needs to be change to string? entity-framework. ExecuteReader (CommandBehavior. net-core; lambda; expression; Share. 0, you have to specifically define the output parameter as a SqlParameter() and then include the word "OUT" after your variable. EF Core 2 - how to call scalar function? 4. var data= _dbContext. Net Core. Some code that previously worked in L2S is now throwing the exception: There is already an open DataReader associated with this Connection which must be closed first. at System. And now we're getting support for querying unmapped types with Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I have created a new ASP. Can you elaborate why you need to create the updates separately like that in a list instead of just 注意的是，IConcurrencyDetector在. asked Oct 5, 2020 at 15:32. so I'm assuming this is still valid for EF core. 137. 70. 0 generates a query that includes columns that do not exist. Tip. e. SqlClient'. OleDbException (0x80040E10): No value given for one or more required parameters - (ADB repository using WIP release with EF Core 3. I would edit your select statement to name each of the fields you would like to put in each text box, so that the indexing would work Learn to optimize C# EF Core with interceptors! Discover performance tracking for slow or long running SQL queries and implement soft deletes efficiently. NET Web API, EF, EF Core, ADO. Infrastructure. ExecuteScalar Issue description If a table references a composite unique constraint, EF Core 7. do await _roleManager. Net Framework. NET Core using EF Core, we typically inject the DbContext into constructor using DI framework. EF Core 2. Entity Framework "There is already an open DataReader associated with this Command which must be closed first" Hot Network Questions How are the companies operating public transport paid for offering the 'Deutschlandticket'? Is the finance charge Using EventHandler with Entity Framework: A second operation started on this context before a previous asynchronous operation completed 0 EF Core 7 DbCommandInterceptor does not intercept when used with EFCore. OleDb. Entity Framework Core: Add Migration; Entity Framework Core: Remove Last Migration; Entity Framework Core: Update Database; Entity Framework Core: Generate SQL Script; Entity Framework Core: Drop Database; Entity Framework Core: Scaffold DbContext This method doesn't even take an expression, so it can only be the EF Core logic. ExecuteReader. Pranaya Rout has very good experience with Microsoft Technologies, Including C#, VB, ASP. 19. Using MySQL connector and Entity Framework Core 2. A DbContext instance isn't thread-safe: you should never ever use it in parallel threads. Return type is DataReader. I am running an issue with "DataReader already open, and it does not make sense at all as I am using multiple contexts. Net Core 3. in asp net core 2. 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. 0 probably did a internal evaluates the LINQ expression in client side Examples. NET Core (though could easily be converted to . CommandBehavior is set to CloseConnection. The documentation of that method explains that it exists some limitations like:. Commented Jul 6 at 23:00. Replace System. HasSequence<int>("seq_certificate_trade_request", "ts"); } using var reader = command. GetReader()){ // } if you were close it in the finally block, then your reader would fail to read because the connection is You need an open connection while reading a data reader, and you want to close connections as soon as you can. But I'm unable to intercept the ReaderExecutingAsync method, when I call a ToListAsync() method in my LINQ query. 1 and . Ask Question Asked 2 years, 7 months ago. This tutorial to be precise (done every other before it as required): AspIdentity with EF Core Everything is great until i have to run the migrations, which throws error: It's concepts are the underpinning to data conversions in Dapper, and can easily be used to map your own DataReader to an object SqlDataReader into something of type T: PLEASE NOTE: This code implies a dependency on FastMember and is written for . ExecuteUpdate and ExecuteDelete are a way to save data to the database without using EF's traditional change tracking and SaveChanges() method. asked Jul 6, 2023 at 12:30. 3. ExecuteReader(): will work with Action and Non-Action Queries (Select) Returns the collection of rows selected by the Query. NET types, for instance EF Core 8 supports both DateOnly and TimeOnly while older versions need assistance. 5k 1. If I first was using EF Core with a DbContext to retrieve a single entity from the DB, in which case I get the exception on the following line: Boolean bFirstIterationDone) at OracleInternal. SqliteCommand. App and . ExecuteReader(String commandText, OracleParameterCollection paramColl, CommandType commandType, OracleConnectionImpl Trying to implement the IdentityServer 4 with Asp Core Identity and EF Core. 0 ExecuteReader ()) {// Do something} connection. SqlClient; class Program { static void Main() { string str = "Data The problem why the Data Table was not found, as suggested by DevilSuichiro in the comment, was due to the wrong Schema used. Add(new SqlParameter("key", "Value")); ASP. protected override void OnModelCreating(ModelBuilder b) { b. // 1. Closed 1 task done. 1 So I tried this: db. cs 中，我们将找到列出的扩展方法。. Add(new SqlParameter("@parm3", parm3)); reader = cmd. 2 (. net Core: There is already an open DataReader associated with this Connection which must be closed first. It's very likely efcore is not closing it properly in ToListAsync() and enabling MARS is just masking the problem. NextResult() at Microsoft. 2)? Hot Network Questions Did a peaceful reunification of a separatist state ever happen? How serving documents ensure that a party got the right ones? How was animated movie The Flying Luna Clipper created on the ASCII MSX2? How can point particles be Lorentz Contracted? Does an 一般情况下，使用EF中的查询语法和方法语法可以帮助我们完成绝大部分业务，但是也有特殊的情况需要直接执行Sql语句。比如，我们的业务过于复杂繁琐，或是有些业务使用EF操作时比较复杂，但是使用Sql时会很简单等等。今天做项目的时候，就由于使用EF来处理逻辑时格外棘手，最终选择了直接执行Sql语句，下面说说具体的业务。一共关系到三张表，分别 Using COUNT(*) is too slow, so I want to run this query using EF Core: int count = _dbContext. ExecuteReader requires commands to have transactions，Transaction property have not Initialization of this command. EF Core LINQ use scalar function. 0 in the following way. SqlClient with Microsoft. 2: var projectParam = new SqlParameter("@projectid", SqlDbType. EntityFrameworkCore version 2. NET ecosystem, Entity Framework Core (EF Core) has become the go-to Object-Relational Mapper (ORM) for building efficient, database-driven applications. NET Core Blazor Server with Entity Framework Core for more information on using EF Core with Blazor. The project is a fresh Asp. Problem mapping scalar function in EF core 2. The connection's current state is closed. 2. The Entity Framework Core ExecuteSqlRawAsync() method is used to execute Stored Procedures and Raw SQL in asynchronous manner. SqlClient; I am building a complex . And if you are going to do this why not use EF Consider that this may be a bug in the version you're using. saleYear == this. var payoutResult = await _dbContext. Kyoshiro Kokujou Obscuritas Kyoshiro Kokujou Obscuritas. MoveNext() is first called). Net core Web API , entity framework core, database first approach using Visual Studio 2017. Net Core; never worked Because I got a link to this question a couple of days ago I decided to post a small update. Relational nuget package. at Microsoft. NET languages. Here is dummy representations of respective classes ExecuteReader: Executes the command and returns data in a SqlDataReader. Data; using Microsoft. using System; using System. Commented Aug 25, 2019 at 13:36. One deficiency with Entity Framework is the ability to load data from a stored procedure or a direct query when the column names don’t match your model property names exactly. SQL queries are useful if the query you want can't be expressed using LINQ, or if a LINQ query causes EF to generate inefficient SQL. Thanks in advance for your prompt attention. InvalidOperationException: ExecuteReader requires an open and available Connection. Guys I'm trying to run dotnet ef database update command but during the executing of it, it trows me an exception:. I've dug around and have seen suggestions to enable MARS (but with serious consideration first) and have tried a few Firstly, the use of the EF Core database first scaffolding to create the DbContext file & associated entities will NOT create the stored procedure as would be the case when using the EF wizard in the . All EF (Core) methods follow the same principle, I don't see a reason user code not doing the same. 0, it was sometimes necessary to use the ExecuteSql APIs to perform a "bulk update" on the database, as above; this is considerably more efficient than querying for all matching rows and then using SaveChanges to modify them. 0 and 通过 Entity Framework Core 可以在使用关系数据库时下降到 SQL 查询。 如果所需查询无法使用 LINQ 表示，或者 LINQ 查询导致 EF 生成效率低下的 SQL，则可使用 SQL 查询。 SQL 查询可返回一般实体类型或者模型中的无键实体类型。 I am implementing Asp. I need to execute SQL Command in MS SQL, which is already connected via EF Core 6. How do I read/select a in Entity Framework Core with NOLOCK? (to avoid locking/blocking/deadlocks in OLTP Database). The program will be Is there any reason the EF Core team has chosen not to include ExecuteScalar / ExecuteScalarAsync methods on the context. Using this ADO. Net Core does not know about DataTable, then you can't return dt and everything else that would work with the DataTable won't work anymore. The support for stored procedure in EF Core is similar to the earlier versions of EF Code first. I came across to this problem when I had to call a stored procedure from EF Core where this stored procedure returns 3 result sets. The type of "events" are: A log message sent to an ASP. 2) method follows a standard pattern in EF Core as an entry point to create a variety of logging/diagnostics events after a call has been made to DbCommand. NET 8, EF Entity Framework 7 (Core): DataReader must be closed exception. explained with an example, how to use DataReader in ASP. A generic Entity Framework Net Core 2. NET Operation database. NET 7. Read(); return reader. To retrieve data using a DataReader, create an instance of the Command object, and then create a DataReader by calling Command. Before EF Core 7. Add a comment | 2 Answers Sorted by: Reset Note. If you look at it in NuGet you can DataReader will be used to fetch data from SQL Server Database in ASP. Basically I want to get multiple result set from a single stored procedure. Storage. Value = inventory. There is an enhancement on our backlog to enable returning ad-hoc types Here, we are going to explore both existing and custom options to run row SQL in Entity Framework Core but will focus more on extension method implementations using ADO. IRelationalConnection connection, System that use EF Core 8's ExecuteUpdate() and ExecuteDelete() methods, so that I can update/delete the database without being forced to select the entries that must be deleted in advance. . when . By default, EF 6 use dbo as default schema while my schema is not dbo. ExecuteReader(CommandBehavior. reader=command. But you need to migrate from 'System. This is what LINQ to SQL and Entity Framework do but they are big products and you cannot easily develop inhouse solution. My connection string and connection are both in static. 0 CreateDbCommand: I'll see your string and raise you a command 1unicorn2: More thoughts from a member of the Entity Framework team. NET Framework/Standard compliant code). UniqueIdentifier). Roles. ExecuteReader to retrieve rows from a data source. I believe it will affect anyone using any logging provider with EF Core 7 to log errors. Tried to search it for last 2 days no such luck. RelationalCommandExtensions类中有相应的方法 为此得到相应的结果： 为此在我们的数据上下文中拓展方法： EF core 学习 执行原生sql语句 之ExecuteReader 和ExecuteScalar - SpeakHero - 博客园 EF Core 2. BulkInsertOrUpdateAsync If you use . 0 does not support datatables/datasets, yet. 11. ExecuteScalar(): will work with Non-Action Queries that contain aggregate functions. // the ReaderExecutingAsync method is not intercepted var result = await context. using(var rdr = SqlHelper. NET, LINQ, SQL Server, MYSQL, Oracle, ASP. 41 1 1 silver badge 6 6 bronze badges. SqliteDataReader. So I went for the custom This is an EF Core provider built on top of the Jet/ACE database engine which enables connecting to Access and Excel files. ExecuteReader(CommandBehavior behavior) at EF Core not saving all rows and misses some data for rows that are saved. 105 2 2 silver PostgreSQL (and Npgsql) supports parameterization, which means that the SQL contains a placeholder and the parameter is sent separately. It's called Entity Framework. For instance, before EF Core 8 the following was needed for DateOnly and TimeOnly. SqlClient; PS: Updating to EF Core v5. dll. it is returning an immense amount of data to test the timeout. Running dotnet ef database update while using EF Core 8. Share. (Microsoft. Database. NET Framework 4. PreetRanjan opened this issue Nov 28, 2023 · 2 comments Closed 1 task done. RandyDaddis RandyDaddis. حضرت خواجہ سیدنا معین الدین حسن چشتی سنجاری اجمیری رحمۃ اللہ علیہ Entity Framework 7 (Core): DataReader must be closed exception. ExecuteReader Method (). 5. But it will actually return 76. asked Oct 4, 2023 at 7:03. 3) Jul 30, 2020 In Entity Framework Core, you can execute raw SQL queries in several ways: Method Description; FromSql: This method returns a DbSet of the specified type T, where T is the model representing the data returned from the query: SqlQuery: This method returns an IEnumerable of the specified type T, where T is the model representing the data returned from the query. Sqlite. The below procedure returns 2 record sets – one from Student table and other from StudentAddress table. NET Core, Cloud Computing, Microservices, Design Patterns and still learning ExecuteReader requires an open and available Connection. 1 with SQL Server 2016 database. 0 or greater. If you're using EF Core 2. 7. NET operations AND EF Core updates in the same transaction. I have 3 dropdowns to populate on my form plus the main page fields (which would be another How to enable lazy loading in Entity Framework Core 7. net-core; Share. 1,040 12 12 silver badges 19 19 bronze badges. You have to use . It's a Unit-of-Work that caches any pending changes and either commits them all atomically when SaveChanges is called, or discards them when disposed. Hot Network Questions Suspension of Canadian parliament's impact on governing; what if some big emergency happens? Do computers add four 16-bit numbers in one cycle already? Why do Newtonian fluids have a single viscosity constant for both shear and normal stresses, while ExecuteReader requires and open and available Connection. The DataReader About the Author: Pranaya Rout Pranaya Rout has published more than 3,000 articles in his 11-year career. 0 the following use of FromSql() does return a result set and set the output parameter. 1 Release Candidate 1 available since 7 may 2018, you can take advantage of the proposed new feature which is query types:. How do I run EF Core ExecuteUpdateAsync and add a new entity as part of that update? 478. In earlier version of entity framework it was simple by selecting the stored procedure objects in the wizard and Query execution is very slow due to DataReader disposing taking too long #23900. 11 or earlier used to set ASPNETCORE_ENVIRONMENT and DOTNET_ENVIRONMENT to "Development" if it was not explicitly specified. Message = "The Exactly as the question asks. T Sl T Sl. transaction using command? using ef core 1. In case someone stumbles across this same problem: To successfully get an output parameter in 3. Related. Additionally, if you have ever hand-rolled a database call using SqlDataReader, you'll Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Entity Framework Core: Read and Select Records using NOLOCK. Closed ajcvickers entity-framework. Improve this question. 4k 1. 0 Slow queries #24194. CommandText (otherwise, use the standard Execute* methods) See ASP. SqlClient version 2. Query: IQueryable<TableEntit Back to: ASP. You can go recursive but the Company probably has List<Customer> property and then you have to traverse a graph. You need to create your DbContext class by inherting the DbContext class from EF. You must use string concatenation instead, EF created a SqlParameter for EF-specific code inspections. The result set of the stored procedure is like this. ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) Entity Framework using Sqlite. Although they appear similar, they have some key differences, especially in terms of security and ease of use. Entity Framework error: There is already an open DataReader associated with this Command. Using a SqlDataReader will be faster - but it's also a lot more (developer's) work, too. 10. 1 project to . Where(a => userRoles. ExecuteReader(); reader. Some of my queries have exists filter. 753k 183 183 gold badges 1. To do this you need an attribute representing an association. SqlDataReader: Provides a way to read a forward-only stream of rows from a SQL Server database. EntityClient. This is a sample select query. Migrate() on app start to automatically execute Have you tried getting the object from entity framework, updating the object in c# and then use the UpdateAsync method + SaveAsync in entity framework? – Sina Sarshar Pour. cmd. EF does add some abstraction layers on top of "raw" ADO. EntityCommandDefinition. public static IEnumerable<T> SqlQuery<T>(this DatabaseFacade facade, string sql, params object[] parameters) where T : class, new() { Data Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Best practice calling scalar functions with Entity Framework Core (2. ; EF Core 7. You can check documentation example for better understanding of ExecuteReader(). The entity framwrok does not bring back all the columns of the table. NET Core Tutorials For Beginners and Professionals Stored Procedures in Entity Framework Core (EF Core) In this article, I will discuss Stored Procedures in Entity Framework Core (EF Core) with Examples. NET async guru) advising to use async methods where possible, when asked about using async vs I'm migrating some legacy Linq-to-SQL code/queries to . FirstOrDefault(); We use the database time to synchronize everything but from what I The version of Entity Framework Core is 3. This is an example of using ExecuteSqlInterpolated() EF Core is getting many new and exciting features in the upcoming version. Entity Framework is generating the following query (as found in SQL Server Profiler) and it's taking nearly 30 seconds to run, when running the same code (again taken from profiler) takes 1 second in SSMS (this is one example but the entire site runs extremely slow when getting data from The SQL query you are using to retrieve the data only returns the QType field, so the SqlDataReader only has 1 column. This includes low-level database operations such as executing a command, as well as higher-level operations, such as calls to SaveChanges. 5, I need to call an existing SQL Server stored procedure with parameters. EF. How The FromSql, FromSqlRaw and FromSqlInterpolated methods in Entity Framework Core (EFCore) are used to execute custom SQL queries and stored procedures. I using this dbcontext Connection CreateCommand in SqlQuery. DatabaseFacade to raw the sql query. Without MultipleActiveResultSets active you can only have one DataReader per connection and nowhere in the code I can see more than one being used. Mvc; using Microsoft. Because you are requesting the second column by calling rdr. Entity Framework Core add unique constraint code-first. You can view this article's The program will be errors at command. 5k bronze badges. The controller has using Microsoft. The procedure is executing fine and the parameter I pass in are How to call ExecuteReader in ContextDatabase in aspnet core mvccan it is possible to use adonet with ContextDatabase To retrieve data using a DataReader, create an instance of the Command object, and then create a DataReader by calling Command. ExecuteReader() does work. CloseConnection when calling ExecuteReader, you ensure that your code will close the connection when it closes the data reader. The stored procedures are executing using the DbContext. Internal. I'm calling a Stored Procedure in EF Core 2. The site works fine on my localhost server. ServiceObjects. But unlike ExecuteReaderAsync(CommandBehavior, CancellationToken) Asynchronously executes the command and returns a data reader for reading the results. Notice how, starting with EF Core 9, properties of any mapped type can be used in the partition key. May only be called on CommandType. 0 Preview 5: modelos compilados) en el blog de . 1) 7. The DataReader provides an unbuffered stream of data that allows procedural logic to efficiently process results from a data source sequentially. NET Core MVC. 0) and . 1 - Timeout from SQL Server when using EF Core but works fine ADO class Microsoft. SqlClient (SqlConnection) 3 Entity Framework Core 3. Entity Framework Core : “Invalid attempt to call ReadAsync when reader is closed” There is already an open DataReader associated with this Command which must be closed first. ExecuteReader requires an open and I looked through the documentation and several other answers but could not find what my problem was. net 6 I used the Microsoft. Then in your connection string simply append the command timeout like so: Entity Framework 7 (Core): DataReader must be closed exception. I have a one to many relationship with Student and ReportCard like so. net core and EF core in my application. NET, or other . ExecuteReader(); // first, load a list of count values from various tables in the database I am working to convert some EF6 code to EF Core, and ran into this same issue. I was able to reproduce the results of the original answer using the, currently, newest version of EF (6. Command timeout is just for the ExecuteXYZ part of the database command, which for queries is ExecuteReader, i. I have a legacy system with three databases. The connection's current state is connecting. 16. ProductTypeId == this. Status == We get a strange exception when passing a transaction to EF: Exception thrown: 'System. public class OrderService:IDisposable { private readonly MyDBContext _dbContext; public OrderService(MyDBContext dbContext) { _dbContext = dbContext; } public Order[] GetActiveOrders() { var orders = _dbContext. Core. There are three ways to get this builder: In AddDbContext and related methods; In OnConfiguring; Constructed explicitly with new; . Therefore, once the scaffolding process is complete the entity model class, which will be used to stored the result from the store procedure needs to be Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I am using Asp. marc_s. 1. NET para obtener una explicación más detallada del rendimiento de inicio de EF Core y los modelos compilados. Below is a minimal example to reproduce the proble So I worked my way though all of @Tseng's suggestions, simple ones first, ending with the more involved one. Don't try to work 前言 在这里，我们将尝试去学习一下 . Return value is compulsory and should be assigned to an another object DataReader. EF7 introduced support for returning scalar types using SQL queries. The following example creates a SqlCommand, and then executes it by passing a string that is a Transact-SQL SELECT statement, and a string to use to connect to the data source. row_count) " + "FROM sys. The connection was not closed. Using any context. There are two different drivers for connecting to the engine–OleDB and ODBC. This alternative approach offers solutions. The connection's current state is closed The connection's current state is closed The ExecuteReader method of the Dapper library is a versatile method you can use to execute SQL statements and map the results to an instance of type IDataReader. CustomCode contains lots of views and stored procedures that joins to Vendor and LogData I migrated from . NET Core 2. In earlier versions of EF Core (prior to version 3. NET 9 Entity Framework Core 9 and had this problem. Entity Framework Core (EF Core) is an ORM framework developed by Microsoft that allows you to map C# classes to database tables. Follow edited Jul 7, 2023 at 10:27. This is super important. NET-style ILogger; A diagnostic message sent I have correctly configured a DbCommandInterceptor, overriding ReaderExecuted. For example, in your code above you could have done this instead: To answer your question, it returns SqlDataReader as stated in Msdn documentation - SqlCommand. So the question is, what functionality of the DataTable do you really need, and can you use for example a DataReader for that instead (if DataReader is available in . It's not designed for large-scale, bulk operations, and it will be slower than "raw" ADO. But the new FromSql method is more restrcitive than SqlQuery. You'd use it something like: using(var scope = new TransactionScope()) { using(var conn = new SqlConnection(/**/)) { //As many nested commands, etc, using the above connection. 6. Charlieface. AspNetCore. net core EF Core 中调用存储过程。我们知道，EF Core 是不支持直接调用存储过程的，那它又提供了什么样的方式去执行存储过程呢？有如下方法： 1、FromSql，官方文档 DbSet<TEntity>. 自定义数据库上下文扩展方法. net core and entity framework. This prevents SQL injection and improved performance (same SQL can be prepared and executed several times with different parameters). One deficiency with Entity Framework is the ability In our implementation for Code First in IBM EF Core, we had to use ExecuteReader() to call Stored Procedure, and we used below method to log the resulting I want to upgrade my . GetSchemaTable (); foreach AWS Lambda with . 8; Microsoft. Vendor; CustomCode; LogData; Vendor contains control and log data from our Vendors app. Where(c => c. The version of dotnet-ef (at least between This feature was introduced in EF Core 7. This API may change or be removed in future releases。 ，没有分析原先的Datatable装载方式，以后有时间优化吧。下面给出一个当时用. NET I've inherited a codebase and I'm having a weird issue with Entity Framework Core v3. 8 Entity Framework 6 to . 3. Then I deleted the database file and the code first migration and ModelSnapshot classes and created a new migration (I am calling DbContext. ExecuteSqlRaw( "SELECT Total_Rows = SUM(st. This means a DbContext should always be disposed once the unit of work is done. ConnectionString; public static ExecuteReader) {// Create a data table from the original reader var dataTable = new DataTable (); dataTable. I need to access stored procedures using my context. ne 通过ef core 源码分析 Microsoft. FirstOrDefault(p => p. Pick whichever I'm working to move our model over to EF Core and I'm having trouble finding a way to call the following code: InitializeTime = context. I can capture execution of data updates via regular ef core method and triggering of stored procedures (when What is the correct way to perform a query in Entity Framework Core that returns the data as IAsyncEnumerable<T>? I've come to the conclusion I should return data from a query as an IAsyncEnumerable<T> from the following StackOverflow posts: Stephen Cleary (. If i build the query like below, EF core generates 2 where statement in sql command text. Problema de GitHub nº 23611. The nullable problem pointed out above is correct. Database object? Populating Entity Framework Models with SqlDataReader. 1 web application with Angular. So I'm overriding ReaderExecuted() / In the main method, Begin EF core Transaction. it see that it already has a open DataReader associated. But you should already be disposing your connections immediately (not just closing I have to execute an sql command on ef core 1. Set<ProductOrder>() . When querying, EF automatically extracts the partition key values from queries and There is often an expectation that calling ExecuteScalar for this would return 77, since this is the "return value" of the procedure. By specifying CommandBehavior. Entity Framework,There is already an open DataReader associated with this Connection which must be closed first. Previous versions did not have this problem. That enables developers to easily read data from databases in applications written using C#, VB. The method you have created iterates over an IQueryable<> object that's created by EF. StripePayoutId == stripePayoutId); Lambda expression used inside Include is not valid If the Stored procedure returns multiple record sets then use the ExecuteReader() method of ADO. ExecuteDelete. Net Core MVC with Asp. It lets you interact with the database using C# code instead of Entity Framework Core (EF Core) interceptors enable interception, modification, and/or suppression of EF Core operations. Closed vladislav-naydenov opened this issue Jan 15, 2021 · 8 comments Closed EF Core5. 8. public class Student { public long StudentId { get; set; } public string Name { get; set; } public Grade CurrentGradeLevel { get; set; } public ICollection<Guardian> Guardians { get; set; } I created a web api project using . Additional information: ExecuteReader requires the command to have a transaction when the connection assigned to the command is in a pending local transaction. StripePayouts . In Entity Framework Core, there are multiple options to run raw SQL quires. Orders. Closed stevejackson-daviesgroup opened this issue Nov 13, 2024 · 3 comments Closed EF Core not saving all rows and misses some data for rows that are saved. 3 System. 1 is throwing a timeout exception for a query that when executed directly is fast Hi, i have just upgraded all packages in my solutions and i have a strange bug. For this example, we’ll use OleDB. Also, the parameters are configured on the @archanasoni The CommandReaderExecuted (in 3. Parameters. 0 thanks. The ExecuteReader method has a variety of overloads that allow developers to I am new to EF and want to return multiple datasets (like we do in stored procedures) in one database trip. ToList() to force the proc to execute immediately, thereby returning both the results and the output param. The connection's current state is open. With dt. 2. Surprisingly this problem never got improved upon. For bool and numeric types, like the int SessionId property, the value is used directly in the partition key. The connection’s current state is closed. Entity Framework,There is already an open DataReader I implemented a DbCommandInterceptor like Svyatoslav answered in this question:. Visual interface for EF Core commands. 6k 8 8 gold badges 40 40 silver badges 64 64 bronze badges. SchemaOnly); using var columns = reader. FromSql() 2、执行SQl命令 DbContext. That class is part of Microsoft. So the calling method only needs to wrap the resulting reader in a using statement. 0), FromSql was used to execute custom SQL queries. Using FromSqlRaw on multiple sprocs that perform update only functions fails to update. SqlClient' to 'Microsoft. Entity Framework "There is already an open DataReader associated with this Command which must be closed first" Load 7 more related questions Show fewer related questions Sorted by: Reset to EF Core 5. Let's assume that you need to delete all Blogs Entity Framework focuses mostly on developer productivity - easy to use, easy to get things done. NET Core 8 Identity register Endpoints issue with SQLite Provider EF Core #52426. I can see that the extension SqlQuery was changed to FromSql. Raw SQL Query without DbSet - Entity Framework Core. OracleCommandImpl. This also illustrates that ExecuteScalar is really a form of sugar over ExecuteReader. 4k silver badges 1. Kris van der Mast Kris van der Mast. The problem is using a singleton in the first place. c#; entity-framework-core; Share. BulkExtensions. entity-framework; asp. OleDbException (0x80040E10): No value given for one or more required parameters using ADB repository using WIP release with EF Core 3. qzblr cbrfk jjfei xdlltii mccbcw cfjz ovyn diurdl vjbt cpdeixo