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using System.Collections.Generic;
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using System.Linq.Expressions;
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using Microsoft.EntityFrameworkCore.Query;
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using Microsoft.EntityFrameworkCore.Query.SqlExpressions;
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namespace EntityFrameworkCore.Jet.Query.Internal;
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/// <summary>
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/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
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/// the same compatibility standards as public APIs. It may be changed or removed without notice in
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/// any release. You should only use it directly in your code with extreme caution and knowing that
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/// doing so can result in application failures when updating to a new Entity Framework Core release.
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/// </summary>
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public class SkipTakeCollapsingExpressionVisitor : ExpressionVisitor
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{
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private readonly ISqlExpressionFactory _sqlExpressionFactory;
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private IReadOnlyDictionary<string, object?> _parameterValues;
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private bool _canCache;
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/// <summary>
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/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
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/// the same compatibility standards as public APIs. It may be changed or removed without notice in
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/// any release. You should only use it directly in your code with extreme caution and knowing that
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/// doing so can result in application failures when updating to a new Entity Framework Core release.
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/// </summary>
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public SkipTakeCollapsingExpressionVisitor(ISqlExpressionFactory sqlExpressionFactory)
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{
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_sqlExpressionFactory = sqlExpressionFactory;
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_parameterValues = null!;
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}
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/// <summary>
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/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
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/// the same compatibility standards as public APIs. It may be changed or removed without notice in
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/// any release. You should only use it directly in your code with extreme caution and knowing that
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/// doing so can result in application failures when updating to a new Entity Framework Core release.
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/// </summary>
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public virtual Expression Process(
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Expression queryExpression,
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IReadOnlyDictionary<string, object?> parametersValues,
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out bool canCache)
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{
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_parameterValues = parametersValues;
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_canCache = true;
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var result = Visit(queryExpression);
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canCache = _canCache;
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return result;
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}
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/// <summary>
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/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
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/// the same compatibility standards as public APIs. It may be changed or removed without notice in
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/// any release. You should only use it directly in your code with extreme caution and knowing that
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/// doing so can result in application failures when updating to a new Entity Framework Core release.
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/// </summary>
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protected override Expression VisitExtension(Expression extensionExpression)
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{
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if (extensionExpression is SelectExpression selectExpression)
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{
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if (IsZero(selectExpression.Limit))
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{
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var result = selectExpression.Update(
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selectExpression.Projection,
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selectExpression.Tables,
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selectExpression.GroupBy.Count > 0 ? selectExpression.Predicate : _sqlExpressionFactory.Constant(false),
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selectExpression.GroupBy,
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selectExpression.GroupBy.Count > 0 ? _sqlExpressionFactory.Constant(false) : null,
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new List<OrderingExpression>(0),
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limit: null,
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offset: null);
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return base.VisitExtension(result);
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}
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bool IsZero(SqlExpression? sqlExpression)
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{
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switch (sqlExpression)
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{
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case SqlConstantExpression { Value: int intValue }:
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return intValue == 0;
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case SqlParameterExpression parameter:
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_canCache = false;
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return _parameterValues[parameter.Name] is 0;
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case SqlBinaryExpression { Left: SqlConstantExpression left, Right: SqlConstantExpression right }:
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return left.Value is int leftValue && right.Value is int rightValue && leftValue + rightValue == 0;
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case SqlBinaryExpression { Left: SqlParameterExpression left, Right: SqlConstantExpression right }:
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_canCache = false;
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return _parameterValues[left.Name] is 0 && right.Value is int and 0;
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case SqlBinaryExpression { Left: SqlConstantExpression left, Right: SqlParameterExpression right }:
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_canCache = false;
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return _parameterValues[right.Name] is 0 && left.Value is int and 0;
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case SqlBinaryExpression { Left: SqlParameterExpression left, Right: SqlParameterExpression right }:
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_canCache = false;
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return _parameterValues[left.Name] is 0 && _parameterValues[right.Name] is 0;
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default:
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return false;
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}
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}
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}
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return base.VisitExtension(extensionExpression);
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}
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}
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Christopher Jolly
2 years ago
committed by
GitHub