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View Code? Open in Web Editor NEWThis library allows you to efficiently compose an IEnumerable<T> in your Entity Framework Core queries when using the SQL Server database provider.
License: Other
This library allows you to efficiently compose an IEnumerable<T> in your Entity Framework Core queries when using the SQL Server database provider.
License: Other
As reported in #30 (comment)
When materializing the query, it fails with a System.InvalidOperationException
exception:
Unable to translate a collection subquery in a projection since either parent or the subquery doesn't project necessary information required to uniquely identify it and correctly generate results on the client side. This can happen when trying to correlate on keyless entity type. This can also happen for some cases of projection before 'Distinct' or some shapes of grouping key in case of 'GroupBy'. These should either contain all key properties of the entity that the operation is applied on, or only contain simple property access expressions.
QueryableValues
are not working when using EFCore InternalServiceProvider
due to missing service registration in the DI container.
Unable to resolve service for type 'BlazarTech.QueryableValues.IQueryableFactory'.
This is often because no database provider has been configured for this DbContext.
A provider can be configured by overriding the 'DbContext.OnConfiguring' method
or by using 'AddDbContext' on the application service provider.
If 'AddDbContext' is used, then also ensure that your DbContext type accepts a DbContextOptions<TContext> object in its constructor and passes it to the base constructor for DbContext.
DI registration of EF is given this way:
services.AddDbContext<TestDbContext>((provider, builder) =>
{
builder.UseSqlServer(connectionString, opt =>
{
opt.UseQueryableValues();
});
builder.UseInternalServiceProvider(EntityFrameworkServices.Build(provider));
});
public static class EntityFrameworkServices
{
private static IServiceProvider _efServices;
public static IServiceProvider Build(IServiceProvider serviceProvider)
{
if (_efServices != null)
return _efServices;
var efServices = new ServiceCollection()
.AddEntityFrameworkSqlServer();
return _efServices = efServices.BuildServiceProvider();
}
}
.NET 6 runtime
<PackageReference Include="BlazarTech.QueryableValues.SqlServer" Version="6.5.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="6.0.5" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="6.0.5" />
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.0.5" />
Looks like the method QueryableValuesSqlServerExtension.ApplyServices
is called on the instance of IServiceCollection
that is not really taking part in the creation of the ServiceProvider
since the instance of the ServiceProvider
has already been built manually.
Do you plan to release a version with native support of Entity Framework Core 8 ?
Thank you very much
Will be available on v8.x
only.
I just noticed in my last EF Core migration it picked up these table properties not sure why but didn't see any documentation if this is required
I have multiple contexts that are registering UseQueryableValues
Of the 9 contexts, when I generate migrations - one of them (ConfigurationContext) - is creating tables that the others are not
Startup.cs
builder.Services.AddDbContext<AccumulationContext>(options =>
options.UseSqlServer(appSettings.ConnectionStrings.Accumulation,
sqlServerOptionsBuilder => { sqlServerOptionsBuilder.UseQueryableValues(); }));
builder.Services.AddDbContext<ConfigurationContext>(options =>
options.UseSqlServer(appSettings.ConnectionStrings.Configuration,
sqlServerOptionsBuilder => { sqlServerOptionsBuilder.UseQueryableValues(); }));
builder.Services.AddDbContext<DispenseCaptureContext>(options =>
options.UseSqlServer(appSettings.ConnectionStrings.DispenseCapture,
sqlServerOptionsBuilder => { sqlServerOptionsBuilder.UseQueryableValues(); }));
etc.
ConfigurationContextModelSnapshot.cs
protected override void BuildModel(ModelBuilder modelBuilder)
{
#pragma warning disable 612, 618
modelBuilder
.HasAnnotation("ProductVersion", "6.0.4")
.HasAnnotation("Relational:MaxIdentifierLength", 128);
SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder, 1L, 1);
modelBuilder.Entity("BlazarTech.QueryableValues.QueryableValuesEntity", b =>
{
b.Property<bool?>("Bool0")
.HasColumnType("bit");
b.Property<bool?>("Bool1")
.HasColumnType("bit");
b.Property<bool?>("Bool2")
.HasColumnType("bit");
b.Property<bool?>("Bool3")
.HasColumnType("bit");
b.Property<bool?>("Bool4")
.HasColumnType("bit");
b.Property<bool?>("Bool5")
.HasColumnType("bit");
b.Property<bool?>("Bool6")
.HasColumnType("bit");
b.Property<bool?>("Bool7")
.HasColumnType("bit");
b.Property<bool?>("Bool8")
.HasColumnType("bit");
b.Property<bool?>("Bool9")
.HasColumnType("bit");
b.Property<byte?>("Byte0")
.HasColumnType("tinyint");
b.Property<byte?>("Byte1")
.HasColumnType("tinyint");
b.Property<byte?>("Byte2")
.HasColumnType("tinyint");
b.Property<byte?>("Byte3")
.HasColumnType("tinyint");
b.Property<byte?>("Byte4")
.HasColumnType("tinyint");
b.Property<byte?>("Byte5")
.HasColumnType("tinyint");
b.Property<byte?>("Byte6")
.HasColumnType("tinyint");
b.Property<byte?>("Byte7")
.HasColumnType("tinyint");
b.Property<byte?>("Byte8")
.HasColumnType("tinyint");
b.Property<byte?>("Byte9")
.HasColumnType("tinyint");
b.Property<string>("Char0")
.HasColumnType("nvarchar(1)");
b.Property<string>("Char1")
.HasColumnType("nvarchar(1)");
b.Property<string>("Char2")
.HasColumnType("nvarchar(1)");
b.Property<string>("Char3")
.HasColumnType("nvarchar(1)");
b.Property<string>("Char4")
.HasColumnType("nvarchar(1)");
b.Property<string>("Char5")
.HasColumnType("nvarchar(1)");
b.Property<string>("Char6")
.HasColumnType("nvarchar(1)");
b.Property<string>("Char7")
.HasColumnType("nvarchar(1)");
b.Property<string>("Char8")
.HasColumnType("nvarchar(1)");
b.Property<string>("Char9")
.HasColumnType("nvarchar(1)");
b.Property<DateTime?>("DateTime0")
.HasColumnType("datetime2");
b.Property<DateTime?>("DateTime1")
.HasColumnType("datetime2");
b.Property<DateTime?>("DateTime2")
.HasColumnType("datetime2");
b.Property<DateTime?>("DateTime3")
.HasColumnType("datetime2");
b.Property<DateTime?>("DateTime4")
.HasColumnType("datetime2");
b.Property<DateTime?>("DateTime5")
.HasColumnType("datetime2");
b.Property<DateTime?>("DateTime6")
.HasColumnType("datetime2");
b.Property<DateTime?>("DateTime7")
.HasColumnType("datetime2");
b.Property<DateTime?>("DateTime8")
.HasColumnType("datetime2");
b.Property<DateTime?>("DateTime9")
.HasColumnType("datetime2");
b.Property<DateTimeOffset?>("DateTimeOffset0")
.HasColumnType("datetimeoffset");
b.Property<DateTimeOffset?>("DateTimeOffset1")
.HasColumnType("datetimeoffset");
b.Property<DateTimeOffset?>("DateTimeOffset2")
.HasColumnType("datetimeoffset");
b.Property<DateTimeOffset?>("DateTimeOffset3")
.HasColumnType("datetimeoffset");
b.Property<DateTimeOffset?>("DateTimeOffset4")
.HasColumnType("datetimeoffset");
b.Property<DateTimeOffset?>("DateTimeOffset5")
.HasColumnType("datetimeoffset");
b.Property<DateTimeOffset?>("DateTimeOffset6")
.HasColumnType("datetimeoffset");
b.Property<DateTimeOffset?>("DateTimeOffset7")
.HasColumnType("datetimeoffset");
b.Property<DateTimeOffset?>("DateTimeOffset8")
.HasColumnType("datetimeoffset");
b.Property<DateTimeOffset?>("DateTimeOffset9")
.HasColumnType("datetimeoffset");
b.Property<decimal?>("Decimal0")
.HasColumnType("decimal(18,6)");
b.Property<decimal?>("Decimal1")
.HasColumnType("decimal(18,6)");
b.Property<decimal?>("Decimal2")
.HasColumnType("decimal(18,6)");
b.Property<decimal?>("Decimal3")
.HasColumnType("decimal(18,6)");
b.Property<decimal?>("Decimal4")
.HasColumnType("decimal(18,6)");
b.Property<decimal?>("Decimal5")
.HasColumnType("decimal(18,6)");
b.Property<decimal?>("Decimal6")
.HasColumnType("decimal(18,6)");
b.Property<decimal?>("Decimal7")
.HasColumnType("decimal(18,6)");
b.Property<decimal?>("Decimal8")
.HasColumnType("decimal(18,6)");
b.Property<decimal?>("Decimal9")
.HasColumnType("decimal(18,6)");
b.Property<double?>("Double0")
.HasColumnType("float");
b.Property<double?>("Double1")
.HasColumnType("float");
b.Property<double?>("Double2")
.HasColumnType("float");
b.Property<double?>("Double3")
.HasColumnType("float");
b.Property<double?>("Double4")
.HasColumnType("float");
b.Property<double?>("Double5")
.HasColumnType("float");
b.Property<double?>("Double6")
.HasColumnType("float");
b.Property<double?>("Double7")
.HasColumnType("float");
b.Property<double?>("Double8")
.HasColumnType("float");
b.Property<double?>("Double9")
.HasColumnType("float");
b.Property<float?>("Float0")
.HasColumnType("real");
b.Property<float?>("Float1")
.HasColumnType("real");
b.Property<float?>("Float2")
.HasColumnType("real");
b.Property<float?>("Float3")
.HasColumnType("real");
b.Property<float?>("Float4")
.HasColumnType("real");
b.Property<float?>("Float5")
.HasColumnType("real");
b.Property<float?>("Float6")
.HasColumnType("real");
b.Property<float?>("Float7")
.HasColumnType("real");
b.Property<float?>("Float8")
.HasColumnType("real");
b.Property<float?>("Float9")
.HasColumnType("real");
b.Property<Guid?>("Guid0")
.HasColumnType("uniqueidentifier");
b.Property<Guid?>("Guid1")
.HasColumnType("uniqueidentifier");
b.Property<Guid?>("Guid2")
.HasColumnType("uniqueidentifier");
b.Property<Guid?>("Guid3")
.HasColumnType("uniqueidentifier");
b.Property<Guid?>("Guid4")
.HasColumnType("uniqueidentifier");
b.Property<Guid?>("Guid5")
.HasColumnType("uniqueidentifier");
b.Property<Guid?>("Guid6")
.HasColumnType("uniqueidentifier");
b.Property<Guid?>("Guid7")
.HasColumnType("uniqueidentifier");
b.Property<Guid?>("Guid8")
.HasColumnType("uniqueidentifier");
b.Property<Guid?>("Guid9")
.HasColumnType("uniqueidentifier");
b.Property<int?>("Int0")
.HasColumnType("int");
b.Property<int?>("Int1")
.HasColumnType("int");
b.Property<int?>("Int2")
.HasColumnType("int");
b.Property<int?>("Int3")
.HasColumnType("int");
b.Property<int?>("Int4")
.HasColumnType("int");
b.Property<int?>("Int5")
.HasColumnType("int");
b.Property<int?>("Int6")
.HasColumnType("int");
b.Property<int?>("Int7")
.HasColumnType("int");
b.Property<int?>("Int8")
.HasColumnType("int");
b.Property<int?>("Int9")
.HasColumnType("int");
b.Property<long?>("Long0")
.HasColumnType("bigint");
b.Property<long?>("Long1")
.HasColumnType("bigint");
b.Property<long?>("Long2")
.HasColumnType("bigint");
b.Property<long?>("Long3")
.HasColumnType("bigint");
b.Property<long?>("Long4")
.HasColumnType("bigint");
b.Property<long?>("Long5")
.HasColumnType("bigint");
b.Property<long?>("Long6")
.HasColumnType("bigint");
b.Property<long?>("Long7")
.HasColumnType("bigint");
b.Property<long?>("Long8")
.HasColumnType("bigint");
b.Property<long?>("Long9")
.HasColumnType("bigint");
b.Property<short?>("Short0")
.HasColumnType("smallint");
b.Property<short?>("Short1")
.HasColumnType("smallint");
b.Property<short?>("Short2")
.HasColumnType("smallint");
b.Property<short?>("Short3")
.HasColumnType("smallint");
b.Property<short?>("Short4")
.HasColumnType("smallint");
b.Property<short?>("Short5")
.HasColumnType("smallint");
b.Property<short?>("Short6")
.HasColumnType("smallint");
b.Property<short?>("Short7")
.HasColumnType("smallint");
b.Property<short?>("Short8")
.HasColumnType("smallint");
b.Property<short?>("Short9")
.HasColumnType("smallint");
b.Property<string>("String0")
.HasColumnType("nvarchar(max)");
b.Property<string>("String1")
.HasColumnType("nvarchar(max)");
b.Property<string>("String2")
.HasColumnType("nvarchar(max)");
b.Property<string>("String3")
.HasColumnType("nvarchar(max)");
b.Property<string>("String4")
.HasColumnType("nvarchar(max)");
b.Property<string>("String5")
.HasColumnType("nvarchar(max)");
b.Property<string>("String6")
.HasColumnType("nvarchar(max)");
b.Property<string>("String7")
.HasColumnType("nvarchar(max)");
b.Property<string>("String8")
.HasColumnType("nvarchar(max)");
b.Property<string>("String9")
.HasColumnType("nvarchar(max)");
b.ToTable("QueryableValuesEntity");
b.ToView("QueryableValuesEntity");
});
I notice there's no overloads specifically for them, so i tried the generic overload
public static IQueryable AsQueryableValues(this DbContext dbContext, IEnumerable values, Action<EntityOptionsBuilder>? configure = null) where TSource : notnull
but that resulted in an exception.
Is this a supported scenario already?
It has caught my attention that the use of the OPENJSON
function is causing performance regressions in EF8, as reported in dotnet/efcore#32394. This seems to be caused by the opaque nature of the function to the query engine, which could result in suboptimal execution plans.
QueryableValues currently depends on both OPENJSON
and XML methods for functionality, and thus, it is impacted to some degree by these issues.
Here are some potential solutions to address this problem:
These two approaches aim to provide the query engine with sufficient information to generate optimal execution plans, which is a priority. Consequently, this behavior should be enabled by default, with an option for users to opt out if desired.
Hi,
Started using this library, thank you for writing it!
When we have non-performant queries our production logging services try to record the query using EFCore's .ToQueryString() method. Once we add QueryableValues to the query however, any attempt to view the generated SQL fail with this exception. This fails for .ToQueryString() and within the debugger's DebugView.Query property as well.
take care
jasen
Hi,
Thanks for the great work on this library. I just tested the latest release with Json serialization and performance improvements are great!
I'm working on some extensions so I can support the in-memory provider (details here), and I noticed a small issue. I'm unable to use properly the generic overload.
This works
using var dbContext = new AppDbContextQueryableJSON();
var names = new string[] { "abc", "def" };
var query = dbContext.Customers.Where(x => dbContext.AsQueryableValues(names, true).Contains(x.Name));
var result = await query.ToListAsync();
This fails
using var dbContext = new AppDbContextQueryableJSON();
var names = new string[] { "abc", "def" };
var query = dbContext.Customers.Where(x => dbContext.AsQueryableValues(names, opt => opt.DefaultForIsUnicode(true)).Contains(x.Name));
var result = await query.ToListAsync();
Stack trace:
System.InvalidOperationException
HResult=0x80131509
Message=The LINQ expression '__8__locals2_dbContext_0
.AsQueryableValues(
values: __names_1,
configure: opt => opt.DefaultForIsUnicode(True))
.Contains(NavigationTreeExpression
Value: EntityReference: Customer
Expression: c.Name)' could not be translated. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. See https://go.microsoft.com/fwlink/?linkid=2101038 for more information.
Source=Microsoft.EntityFrameworkCore
StackTrace:
at Microsoft.EntityFrameworkCore.Query.Internal.NavigationExpandingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
at Microsoft.EntityFrameworkCore.Query.Internal.NavigationExpandingExpressionVisitor.ExpandNavigationsForSource(NavigationExpansionExpression source, Expression expression)
at Microsoft.EntityFrameworkCore.Query.Internal.NavigationExpandingExpressionVisitor.ProcessLambdaExpression(NavigationExpansionExpression source, LambdaExpression lambdaExpression)
at Microsoft.EntityFrameworkCore.Query.Internal.NavigationExpandingExpressionVisitor.ProcessWhere(NavigationExpansionExpression source, LambdaExpression predicate)
at Microsoft.EntityFrameworkCore.Query.Internal.NavigationExpandingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
at Microsoft.EntityFrameworkCore.Query.Internal.NavigationExpandingExpressionVisitor.Expand(Expression query)
at Microsoft.EntityFrameworkCore.Query.QueryTranslationPreprocessor.Process(Expression query)
at Microsoft.EntityFrameworkCore.Query.QueryCompilationContext.CreateQueryExecutor[TResult](Expression query)
at Microsoft.EntityFrameworkCore.Storage.Database.CompileQuery[TResult](Expression query, Boolean async)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.CompileQueryCore[TResult](IDatabase database, Expression query, IModel model, Boolean async)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass12_0`1.<ExecuteAsync>b__0()
at Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOrAddQuery[TResult](Object cacheKey, Func`1 compiler)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExecuteAsync[TResult](Expression query, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.ExecuteAsync[TResult](Expression expression, CancellationToken cancellationToken)
at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable`1.GetAsyncEnumerator(CancellationToken cancellationToken)
at System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable`1.GetAsyncEnumerator()
at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.<ToListAsync>d__65`1.MoveNext()
Any feedback is appreciated.
Hi,
I'm trying to convert a few of my existing queries to use your library and one of them is causing an issue.
I've got a Guid?
column in my table that I'm attempting to do a Contains on.
Using .Value will throw an error because it causes client side evaluation.
I get the below error:
Error CS1929 'IQueryable<Guid>' does not contain a definition for 'Contains' and the best extension method overload 'MemoryExtensions.Contains<Guid?>(ReadOnlySpan<Guid?>, Guid?)' requires a receiver of type 'System.ReadOnlySpan<System.Guid?>'
Is there any alternative/recommended approach?
Thanks in advance.
EDIT:
I think I've resolved it by using the Join function instead.
Thanks for the useful tool.
I frequently have a list of entities that I want to "join" with a database table.
I combined this project with LinqKit and created https://gist.github.com/andrewkittredge/ce322944caf5781eb7f4efade5c1266e.
I am interested in you opinion. Is there a better way?
EF.Property throws exception with list used in AsQueryableValues() extension,
Details:
EF Core Version: 8.0.1
Database Engine: SQL Server
Exception: "The EF.Property method may only be used within Entity Framework LINQ queries"
Note: Reverse engineering "scaffolding" was used to automatically generate the dbcontext
There're some cases where we cannot read properties directly and we need to use EF.Property instead, this extension does not work with AsQueryableValues list and throws the exception, I understand this exception is normally raised when client evaluation happens instead of server evaluation, so maybe when we use EF.Property along with AsQueryableValues it forces client evaluation for some reason, example with temporal tables below:
var modificationLogs = dbContext.Set<ObjectName>().TemporalAll().AsQueryable();
var properties = new List<string>() { "Name", "Code", "ValidFrom", "ValidTo" };
var query = from modificationLog1 in modificationLogs
join modificationLog2 in modificationLogs on EF.Property<DateTime>(modificationLog1, "ValidTo") equals EF.Property<DateTime>(modificationLog2, "ValidFrom")
from property in dbContext.AsQueryableValues(properties, true)
select new ()
{
Date = EF.Property<DateTime>(modificationLog1, "ValidTo").ToString(), // this one works correctly,
Field = property, // this one works correctly,
From = EF.Property<object>(modificationLog1, "Name").ToString() // this one works correctly,
// From = EF.Property<object>(modificationLog1, property).ToString() // this one "when enabled" does not work and throws the exception
};
var items = await query.ToListAsync(); // exception thrown here
Edit #1: Fixed Typo
Add support for:
Currently the SQL generated by this library invokes OpenJson
with explicit mappings, for example:
declare @p0 nvarchar(max) = '[{"X":0,"I":123},...,{"X:"99","I":987}]' // 100 integer values
declare @__p_1 int = 3000
declare @__p_2 int = 100
SELECT [r].[Id], [r].[Amount], [r.AccountId]
FROM [Transactions] AS [r]
WHERE EXISTS (
SELECT 1
FROM (
SELECT TOP(@p1) [X], [I]
FROM OPENJSON(@p0) WITH ([X] int, [I] int)
ORDER BY [X]
) AS [b]
WHERE [b].[I] = [r].[AccountId]) // AccountId is an integer
OFFSET @__p_1 ROWS FETCH NEXT @__p_2 ROWS ONLY
From my testing the above is slower than using the implicit mappings version:
declare @p0 nvarchar(max) = '[123,...,987]' // 100 integer values
declare @__p_1 int = 3000
declare @__p_2 int = 100
SELECT [r].[Id], [r].[Amount], [r.AccountId]
FROM [Transactions] AS [r]
WHERE EXISTS (
SELECT 1
FROM OPENJSON(@p0) AS [b]
WHERE CONVERT(INT, [b].[value]) = [r].[AccountId])
OFFSET @__p_1 ROWS FETCH NEXT @__p_2 ROWS ONLY
because the former query incurs Sort
and Top
operations, versus only a Compute Scalar
for the former. The latter also sends a smaller amount of data to the server in the JSON-serialised parameter.
What is the reason for using the explicit mappings version instead of implicit? And would you be willing to add functionality to control whether implicit or explicit is used?
Avoid using EF Core when referring to Entity Framework 7 (EF7) and above per https://devblogs.microsoft.com/dotnet/announcing-ef7-rc1/#ef7-prerequisites
I've a service that builds a dynamic query WHERE
condition based on some filters.
I'm trying to use your library to build one of those filter, related to an array of enum values, but I'm getting this Exception at runtime:
The type
MyProject.Api.Data.Models.OperationType
must have at least one public property.
The user can select one or more of those values and so the WHERE
condition has to be built using OR
.
The MyProject.Api.Data.Models.OperationType
is an enum type defined as follows:
public enum OperationType : byte
{
DT = 1,
NP = 2,
Tx = 3,
RE = 4,
I = 5,
AT = 6,
M = 7,
TR = 8,
TxAT = 9
}
My actual code for building the query is this:
...
if (filter.OperationTypes?.Any() == true)
{
// Conversion from API enum model to EF enum model
var operationTypes = filter.OperationTypes.Select(c => Enum.Parse<Data.Models.OperationType>(c.ToString(), true)).ToArray();
// Call to AsQueryableValues that causes the Exception
var queryableValues = _dbContext.AsQueryableValues(operationTypes);
query = query.Where(x => x.Movements.OperationType != null && queryableValues.Contains(x.Movements.OperationType.Value));
}
...
Am I doing something wrong? How am I supposed to use the library with enums?
As of now, QueryableValues relies on the XML capabilities of SQL Server in order to efficiently project the in-memory values in a T-SQL query. These capabilities are available in all supported versions of SQL Server to date.
JSON support was introduced in SQL Server 2016. Early benchmarks shows that JSON performs close to 1 order of magnitude faster than its XML counterpart, therefore, I'm considering providing support for it. This can be achieved via OPENJSON
.
OPENJSON
is only available under the following conditions:
...
sqlServerOptionsBuilder.
UseQueryableValues(options => options.UseJson(Auto|Always|Never));
...
I got an issue, while trying to read a query plain text
Min example:
using BlazarTech.QueryableValues;
using Microsoft.EntityFrameworkCore;
var dbContext = new ApplicationContext();
var codes = new[] { 1, 2 };
var query = dbContext.Docs
.Where(x => dbContext.AsQueryableValues(codes).Contains(x.Id));
Console.WriteLine(query.ToQueryString());
public class doc
{
public int Id { get; set; }
}
public class ApplicationContext : DbContext
{
public DbSet<doc> Docs { get; set; }
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseSqlServer(
"..........",
o => o.UseQueryableValues());
}
}
The example above throws an exception:
System.InvalidCastException: Unable to cast object of type 'BlazarTech.QueryableValues.DeferredInt32Values' to type 'System.String'.
Enviroment:
BlazarTech.QueryableValues 1.0.9
.net 7.0.202
ef core 7.0.4
Hey @yv989c question for you,
We have a service that is querying to find packages that contain items from list 1 and list 2,
This ends up pulling back packages that satisfy list 1 or list 2,
Is there a way to write this so we get a list of packages back that contain both using the queryable values? (They can be large lists)
Thanks!
public async Task<List<Package>> GetPackagesAsync(List<int> list1, List<string> list2)
{
return await _context.Package
.Where(p => _context
.AsQueryableValues(list1)
.Contains(p.p1))
.Where(p => _context
.AsQueryableValues(list2, true)
.Contains(p.p2))
.ToListAsync();
}
On .NET 8, using latest non-preview version (8.1.0) says it depends on
Microsoft.IO.RecyclableMemoryStream >= 2.3.2
which allows 3.0.0. However, when run in Json mode, you end up with
System.MissingMethodException: Method not found: 'System.IO.MemoryStream Microsoft.IO.RecyclableMemoryStreamManager.GetStream()'.
at BlazarTech.QueryableValues.Serializers.JsonSerializer.<Serialize>g__GetJson|2_2[T](IEnumerable`1 values, Action`2 writeValue, Func`2 mustSkipValue)
at BlazarTech.QueryableValues.Serializers.JsonSerializer.Serialize[T](IEnumerable`1 values, IReadOnlyList`1 propertyMappings)
at BlazarTech.QueryableValues.DeferredValues`3.ToString(IFormatProvider provider)
with a csproj with
<PackageReference Include="Microsoft.IO.RecyclableMemoryStream" Version="3.0.0" />
in it. Unfortunately I have another dependency that requires Microsoft.IO.RecyclableMemoryStream >= 3.0.0 so I can't revert to 2.3.x, so I'll have to drop AsQueryableValues for now. Figured I'd let you know so you can consume latest or constrain that dependency at least!
The XML 1.0 spec which is used by the underline XmlWriter does not allow some control characters and may be others.
I don't think that the current runtime exception provides a good UX.
Some options:
I believe this is a corner case though but is still a limitation because these characters can be stored using the varchar
and nvarchar
data types in SQL Server.
Relevant info: https://stackoverflow.com/a/28152666/2206145
https://docs.microsoft.com/en-us/ef/core/providers/in-memory/
Will be useful in test scenarios.
If we use this with compiled models, the special types used behind the scenes breaks the build.
After rebuilding/regenerating our compiled models we got a generated model that references the internal types SimpleQueryableValuesEntity
, ComplexQueryableValuesEntity
and QueryableValuesEntity
(and possibly some more that I didn't catch).
CompiledModels/ComplexQueryableValuesEntityEntityType.cs(3432,35): error CS0122: 'ComplexQueryableValuesEntity' is inaccessible due to its protection level
Got almost 400 variations of that error in different generated files. And since it breaks the build, I need to manually clean this up since rebuilding these files requires the project to build in the first place.
The simplest solution would be to just make these classes public, maybe put into a Internal
namespace or something to signal that they shouldn't be used directly by the end user.
Hey,
just wanted to ask you if MySql is also supported, because I couldn´t find any information about it.
Automatically treats IEnumerable<T>
types composed in a LINQ expression as if they were provided via the AsQueryableValues
method. I'm assuming that the direct use of the IEnumerable<T>
type is likely to have a non-constant sequence of values.
There's also the legitime case of not wanting to use QueryableValues
. Like having a small list of constant values that I want hardcoded in the T-SQL, so I can use T[]
or List<T>
for these.
Some desired attributes:
IEnumerable<T>
so they can also be treated this way per user needs.With non-intrusive mode On
, the following two queries will use QueryableValues
(in both cases the values will be parameterized in the T-SQL query):
IEnumerable<int> values = Enumerable.Range(1, 10);
var myQuery1 =
from i in dbContext.MyEntities
where dbContext
.AsQueryableValues(values)
.Contains(i.MyEntityID)
select new
{
i.MyEntityID,
i.PropA
};
var myQuery2 =
from i in dbContext.MyEntities
where values.Contains(i.MyEntityID)
select new
{
i.MyEntityID,
i.PropA
};
With non-intrusive mode On
, the first query will use QueryableValues
and the second will not (the values will be hardcoded in the T-SQL instead of being parameterized):
List<int> values = Enumerable.Range(1, 10).ToList();
var myQuery1 =
from i in dbContext.MyEntities
where dbContext
.AsQueryableValues(values)
.Contains(i.MyEntityID)
select new
{
i.MyEntityID,
i.PropA
};
var myQuery2 =
from i in dbContext.MyEntities
where values.Contains(i.MyEntityID)
select new
{
i.MyEntityID,
i.PropA
};
Not having to introduce an alien method (AsQueryableValues
) in our EF queries is better for portability.
Maybe be something around rewriting the original LINQ expression at some point in the EF query processing pipeline. Find IEnumerable<T>
and replace with AsQueryableValues(DbContext, IEnumerable<T>)
.
Versions 3 and 5 of the library can benefit from the new TryGetNonEnumeratedCount available in .net 6.
It's used here:
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