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OptimizationContext.cs
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OptimizationContext.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using LinqToDB.SqlQuery.Visitors;
namespace LinqToDB.SqlProvider
{
using Common;
using DataProvider;
using Mapping;
using SqlQuery;
public class OptimizationContext
{
private IQueryParametersNormalizer? _parametersNormalizer;
private Dictionary<SqlParameter, SqlParameter>? _parametersMap;
private List<SqlParameter>? _actualParameters;
private Dictionary<(DbDataType, object?), SqlParameter>? _dynamicParameters;
public DataOptions DataOptions { get; }
public SqlProviderFlags? SqlProviderFlags { get; }
public MappingSchema MappingSchema { get; }
public SqlExpressionConvertVisitor ConvertVisitor { get; }
public SqlExpressionOptimizerVisitor OptimizerVisitor { get; }
readonly Func<IQueryParametersNormalizer> _parametersNormalizerFactory;
public SqlQueryVisitor.IVisitorTransformationInfo TransformationInfo =>
_transformationInfo ??= new SqlQueryVisitor.VisitorTransformationInfo();
SqlQueryVisitor.IVisitorTransformationInfo? _transformationInfo;
public SqlQueryVisitor.IVisitorTransformationInfo TransformationInfoConvert =>
_transformationInfoConvert ??= new SqlQueryVisitor.VisitorTransformationInfo();
SqlQueryVisitor.IVisitorTransformationInfo? _transformationInfoConvert;
public OptimizationContext(
EvaluationContext evaluationContext,
DataOptions dataOptions,
SqlProviderFlags? sqlProviderFlags,
MappingSchema mappingSchema,
SqlExpressionOptimizerVisitor optimizerVisitor,
SqlExpressionConvertVisitor convertVisitor,
bool isParameterOrderDepended,
bool isAlreadyOptimizedAndConverted,
Func<IQueryParametersNormalizer> parametersNormalizerFactory)
{
EvaluationContext = evaluationContext;
DataOptions = dataOptions;
SqlProviderFlags = sqlProviderFlags;
MappingSchema = mappingSchema;
OptimizerVisitor = optimizerVisitor;
ConvertVisitor = convertVisitor;
IsParameterOrderDependent = isParameterOrderDepended;
IsAlreadyOptimizedAndConverted = isAlreadyOptimizedAndConverted;
_parametersNormalizerFactory = parametersNormalizerFactory;
}
public EvaluationContext EvaluationContext { get; }
public bool IsParameterOrderDependent { get; }
public bool IsAlreadyOptimizedAndConverted { get; }
public bool HasParameters() => _actualParameters?.Count > 0;
public IReadOnlyList<SqlParameter> GetParameters() => _actualParameters ?? (IReadOnlyList<SqlParameter>)[];
public SqlParameter AddParameter(SqlParameter parameter)
{
var returnValue = parameter;
if (!IsParameterOrderDependent && _parametersMap?.TryGetValue(parameter, out var newParameter) == true)
{
returnValue = newParameter;
}
else
{
var newName = (_parametersNormalizer ??= _parametersNormalizerFactory()).Normalize(parameter.Name);
if (IsParameterOrderDependent || newName != parameter.Name)
{
returnValue = new SqlParameter(parameter.Type, newName, parameter.Value)
{
AccessorId = parameter.AccessorId,
ValueConverter = parameter.ValueConverter,
NeedsCast = parameter.NeedsCast
};
}
if (!IsParameterOrderDependent)
(_parametersMap ??= new()).Add(parameter, returnValue);
(_actualParameters ??= new()).Add(returnValue);
}
return returnValue;
}
public SqlParameter SuggestDynamicParameter(DbDataType dbDataType, object? value)
{
var key = (dbDataType, value);
if (_dynamicParameters == null || !_dynamicParameters.TryGetValue(key, out var param))
{
// converting to SQL Parameter
// real name (in case of conflicts) will be generated on later stage in AddParameter method
param = new SqlParameter(dbDataType, "value", value);
_dynamicParameters ??= new();
_dynamicParameters.Add(key, param);
}
return param;
}
public void ClearParameters()
{
// must discard instance instead of Clean as it is returned by GetParameters
_actualParameters = null;
_parametersNormalizer = null;
}
[return : NotNullIfNotNull(nameof(element))]
public T OptimizeAndConvertAll<T>(T element, NullabilityContext nullabilityContext)
where T : class, IQueryElement
{
var newElement = OptimizerVisitor.Optimize(EvaluationContext, nullabilityContext, null, DataOptions, MappingSchema, element, visitQueries : true, isInsideNot : false, reduceBinary: true);
var result = (T)ConvertVisitor.Convert(this, nullabilityContext, newElement, visitQueries : true, isInsideNot : false);
return result;
}
[return: NotNullIfNotNull(nameof(element))]
public T? OptimizeAndConvert<T>(T? element, NullabilityContext nullabilityContext, bool isInsideNot)
where T : class, IQueryElement
{
if (IsAlreadyOptimizedAndConverted)
return element;
if (element == null)
return null;
var newElement = OptimizerVisitor.Optimize(EvaluationContext, nullabilityContext, null, DataOptions, MappingSchema, element, visitQueries : false, isInsideNot, reduceBinary : false);
var result = (T)ConvertVisitor.Convert(this, nullabilityContext, newElement, false, isInsideNot);
return result;
}
[return: NotNullIfNotNull(nameof(element))]
public T? Optimize<T>(T? element, NullabilityContext nullabilityContext, bool isInsideNot, bool reduceBinary)
where T : class, IQueryElement
{
if (element == null)
return null;
var newElement = OptimizerVisitor.Optimize(EvaluationContext, nullabilityContext, null, DataOptions, MappingSchema, element, false, isInsideNot, reduceBinary);
return (T)newElement;
}
}
}