Execute SQL command in Entity Framework Core 2.0 to delete all data in a table

asp.net-core-2.0 c# entity-framework-core sql

Question

I want to execute an SQL command from Entity Framework Core 2.0, but I can't figure out how to do so.

1.- The reason why I need to, is that I want to delete all data from a database table, and using Context.remove or Context.removeRange would produce many calls to DB (one for each data in the table).

2.- I've read that there is a method .ExecuteSqlCommand to accomplish that, but that method is not present in my Context.Database (maybe in Core 2.0 it was removed?). Here is the source of the info: Dropping table In Entity Framework Core and UWP

So, basically I need to delete a table from code using EF Core 2.0 and, as far as I know, I need to execute a SQL command for that.

Thank you.

Here is my .csproj, just in case i'm missing something

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <AssetTargetFallback>$(AssetTargetFallback);portable-net45+win8+wp8+wpa81;</AssetTargetFallback>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.0" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.0" PrivateAssets="All" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="2.0.0" PrivateAssets="All" />    
  </ItemGroup>

  <ItemGroup>
    <!--<PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.1.1" />    -->
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.0" />
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
  </ItemGroup>

</Project>
1
18
9/8/2017 11:31:17 AM

Accepted Answer

Ensure that you reference Microsoft.EntityFrameworkCore to include all the necessary extension methods that would allow you to execute raw SQL commands.

From the source repository I found ExecuteSqlCommand and related extension methods

int count = await context.Database.ExecuteSqlCommandAsync("DELETE FROM [Blogs]");

Found an article that suggested using ADO.Net.

First you grab a connection from the context, create a command and execute that.

using (var connection = context.Database.GetDbConnection()) {
    await connection.OpenAsync();     
    using (var command = connection.CreateCommand()) {
        command.CommandText = "DELETE FROM [Blogs]";
        var result = await command.ExecuteNonQueryAsync();
    }
}
26
9/8/2017 12:07:53 PM

Popular Answer

This will perform over any of delete row-per-row from table methods.

context.ExecuteStoreCommand("TRUNCATE TABLE [" + tableName + "]");

TRUNCATE TABLE is similar to the DELETE statement with no WHERE clause; however, TRUNCATE TABLE is faster and uses fewer system and transaction log resources.

ExecuteStoreCommand

TRUNCATE TABLE



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