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Closes dotnet#29427 Closes dotnet#30426 Closes dotnet#13617
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src/EFCore.Relational/Properties/RelationalStrings.Designer.cs
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src/EFCore.Relational/Query/RelationalQueryRootProcessor.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| using Microsoft.EntityFrameworkCore.Query.Internal; | ||
| using Microsoft.EntityFrameworkCore.Query.SqlExpressions; | ||
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| namespace Microsoft.EntityFrameworkCore.Query; | ||
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| /// <inheritdoc /> | ||
| public class RelationalQueryRootProcessor : QueryRootProcessor | ||
| { | ||
| private readonly ITypeMappingSource _typeMappingSource; | ||
| private readonly IModel _model; | ||
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| /// <summary> | ||
| /// Creates a new instance of the <see cref="RelationalQueryRootProcessor" /> class. | ||
| /// </summary> | ||
| /// <param name="typeMappingSource">The type mapping source.</param> | ||
| /// <param name="model">The model.</param> | ||
| public RelationalQueryRootProcessor(ITypeMappingSource typeMappingSource, IModel model) | ||
| { | ||
| _typeMappingSource = typeMappingSource; | ||
| _model = model; | ||
| } | ||
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| /// <inheritdoc /> | ||
| protected override Expression VisitMethodCall(MethodCallExpression methodCallExpression) | ||
| { | ||
| // Create query root node for table-valued functions | ||
| if (_model.FindDbFunction(methodCallExpression.Method) is { IsScalar: false, StoreFunction: var storeFunction }) | ||
| { | ||
| // See issue #19970 | ||
| return new TableValuedFunctionQueryRootExpression( | ||
| storeFunction.EntityTypeMappings.Single().EntityType, | ||
| storeFunction, | ||
| methodCallExpression.Arguments); | ||
| } | ||
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| return base.VisitMethodCall(methodCallExpression); | ||
| } | ||
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| /// <summary> | ||
| /// Given a queryable constants over an element type which has a type mapping, converts it to a | ||
| /// <see cref="ConstantQueryRootExpression" />; it will be translated to a SQL <see cref="ValuesExpression" />. | ||
| /// </summary> | ||
| /// <param name="constantExpression">The constant expression to attempt to convert to a query root.</param> | ||
| protected override Expression VisitQueryableConstant(ConstantExpression constantExpression) | ||
| // TODO: Note that we restrict to constants whose element type is mappable as-is. This excludes a constant list with an unsupported | ||
| // CLR type, where we could infer a type mapping with a value converter based on its later usage. However, converting all constant | ||
| // collections to query roots also carries risk. | ||
| => constantExpression.Type.TryGetSequenceType() is Type elementType && _typeMappingSource.FindMapping(elementType) is not null | ||
| ? new ConstantQueryRootExpression(constantExpression) | ||
| : constantExpression; | ||
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| /// <inheritdoc /> | ||
| protected override Expression VisitQueryableParameter(ParameterExpression parameterExpression) | ||
| { | ||
| // TODO: Decide whether this belongs here or in specific provider code. This means parameter query roots always get created | ||
| // (in enumerable/queryable context), but may not be translatable in the provider's QueryableMethodTranslatingEV. As long | ||
| // as we unwrap there, we *should* be OK, and so don't need an additional provider extension point here... | ||
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| // TODO: Also, maybe this type checking should be in the base class. | ||
| // SQL Server's OpenJson, which we use to unpack the queryable parameter, does not support geometry (or any other non-built-in | ||
| // types) | ||
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| // We convert to query roots only parameters whose CLR type has a collection type mapping (i.e. ElementTypeMapping isn't null). | ||
| // This allows the provider to determine exactly which types are supported as queryable collections (e.g. OPENJSON on SQL Server). | ||
| return _typeMappingSource.FindMapping(parameterExpression.Type) is { ElementTypeMapping: not null } | ||
| ? new ParameterQueryRootExpression(parameterExpression.Type.GetSequenceType(), parameterExpression) | ||
| : parameterExpression; | ||
| } | ||
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| /// <inheritdoc /> | ||
| protected override Expression VisitExtension(Expression node) | ||
| => node switch | ||
| { | ||
| // We skip FromSqlQueryRootExpression, since that contains the arguments as an object array parameter, and don't want to convert | ||
| // that to a query root | ||
| FromSqlQueryRootExpression e => e, | ||
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| _ => base.VisitExtension(node) | ||
| }; | ||
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| } |
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