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how to excute entity framework trace sql


By : The Great and Mighty
Date : October 15 2020, 08:10 PM
hope this fix your issue Any command sent from EF to the database is logged. To view the generated queries from EF 6.x, use the DBContext.Database.Log property
More info: https://docs.microsoft.com/en-us/ef/ef6/fundamentals/logging-and-interception
code :


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Best way to show the SQL trace of a LINQ query to Entity Framework 3.5


By : Jeff Billingsgate Fr
Date : March 29 2020, 07:55 AM
Does that help Best way to show the SQL trace of a LINQ query to Entity Framework 3.5? , I just attempted to do this:
code :
        Dim TraceString As String = TryCast(Query, ObjectQuery).ToTraceString

SQL Server Profiler do not trace all Entity Framework 4 queries - issue


By : user3882520
Date : March 29 2020, 07:55 AM
around this issue Bingo!
I've selected all event types and it turned out that Addresses query was tracable as RPC:Completed, whereas Contact was tracable as SQL:BatchCompleted:
code :
exec sp_executesql N'SELECT 
[Extent1].[addressID] AS [addressID], 
[Extent1].[Street1] AS [Street1], 
[Extent1].[Street2] AS [Street2], 
[Extent1].[City] AS [City], 
[Extent1].[StateProvince] AS [StateProvince], 
[Extent1].[CountryRegion] AS [CountryRegion], 
[Extent1].[PostalCode] AS [PostalCode], 
[Extent1].[AddressType] AS [AddressType], 
[Extent1].[ContactID] AS [ContactID], 
[Extent1].[ModifiedDate] AS [ModifiedDate]
FROM [dbo].[Address] AS [Extent1]
WHERE [Extent1].[ContactID] = @EntityKeyValue1',N'@EntityKeyValue1 int',@EntityKeyValue1=220

Trace Entity Framework 4.0 : Extra queries for foreign keys


By : Nirav Mehta
Date : March 29 2020, 07:55 AM
will help you It looks like the extra query is populating a collection of tasks on the returned Contract object. Try projecting just the column you want:
code :
int contractId = context.Contracts
   .Where(T => T.Name == contractName)
   .Select(T => T.Id)
   .Single();

How to trace an Entity Framework Core event for integration testing?


By : The Amateur
Date : March 29 2020, 07:55 AM
like below fixes the issue EF Core doesn't provide its own tracing mechanism. However, it logs a lot of database interaction events. We could gather these log messages and check their EventId to determine did a specific operation occur or not. Here is the list of relational events used by EF Core:
EF Core 1.1.2: RelationalEventId enum.
code :
[Fact]
public async Task TransactionCommit_Logger_ContainsEvent()
{
    var logger = new FakeLogger();

    var factoryMock = new Mock<ILoggerFactory>();
    factoryMock.Setup(f => f.CreateLogger(It.IsAny<string>()))
        .Returns(logger);

    using (var context = new FooContext(factoryMock.Object))
    {
        using (var transaction = await context.Database.BeginTransactionAsync())
        {
            transaction.Commit();
        }
    }

    Assert.True(logger.Events.Contains((int)RelationalEventId.CommittingTransaction));
}
public class FakeLogger : ILogger
{
    public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception,
        Func<TState, Exception, string> formatter)
    {
        Events.Add(eventId.Id);
    }

    public List<int> Events { get; set; } = new List<int>();

    public bool IsEnabled(LogLevel logLevel) => true;

    public IDisposable BeginScope<TState>(TState state) => null;
}    
public class FooContext : FooParentContext
{
    private readonly ILoggerFactory _loggerFactory;

    public FooContext() { }

    public FooContext(ILoggerFactory loggerFactory)
    {
        _loggerFactory = loggerFactory;
    }

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        base.OnConfiguring(optionsBuilder);

        optionsBuilder.UseLoggerFactory(_loggerFactory);
    }
}

Port existing code first models, and fluent aPI configuration from Entity Framework 6 to Entity Framework Core 2.0


By : Nguyen Duc Thao
Date : March 29 2020, 07:55 AM
around this issue
In EF Core 2.0 the Car model changes because of the need to specify the CarOwner foreign key in the Model as a nullable integer property
code :
public class CarConfiguration : IEntityTypeConfiguration<Car>
{
    public void Configure(EntityTypeBuilder<Car> builder)
    {
        builder.HasKey(a => a.Id);
        builder.Property(a => a.Id).ValueGeneratedOnAdd().IsRequired();
        builder.HasOne(x => x.CarOwner)
            .WithMany(x => x.Cars)
            .HasForeignKey("CarOwner_Id") // <--
            .IsRequired(false);
    }
}

public class CarOwnerConfiguration : IEntityTypeConfiguration<CarOwner>
{
    public void Configure(EntityTypeBuilder<CarOwner> builder)
    {
        builder.HasKey(a => a.Id);
        builder.Property(a => a.Id).ValueGeneratedOnAdd().IsRequired();
    }
}
modelBuilder.Entity<Car>()
    .HasOne(x => x.CarOwner)
    .WithMany(x => x.Cars)
    .HasForeignKey("CarOwner_Id");
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