public virtual SqlExpression Translate([NotNull] Expression expression)
{
Check.NotNull(expression, nameof(expression));
var result = Visit(expression);
if (result is SqlExpression translation)
{
if (translation is SqlUnaryExpression sqlUnaryExpression &&
sqlUnaryExpression.OperatorType == ExpressionType.Convert &&
sqlUnaryExpression.Type == typeof(object))
{
translation = sqlUnaryExpression.Operand;
}
translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(translation);
if ((translation is SqlConstantExpression ||
translation is SqlParameterExpression) &&
translation.TypeMapping == null)
{
// Non-mappable constant/parameter
return(null);
}
_sqlTypeMappingVerifyingExpressionVisitor.Visit(translation);
return(translation);
}
return(null);
}
public virtual SqlExpression Translate(
SqlExpression instance,
MemberInfo member,
System.Type returnType)
{
var declaringType = member.DeclaringType;
if (declaringType == typeof(DateTime))
{
var memberName = member.Name;
if (s_datePartMapping.TryGetValue(memberName, out var datePart))
{
var extract = _sqlExpressionFactory.Function(
"EXTRACT",
new[] { new SpannerTimestampExtractExpression(_sqlExpressionFactory, instance, datePart) },
returnType);
if (datePart == "DAYOFWEEK")
{
// Cloud Spanner is 1-based, .NET is 0-based.
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.Subtract(extract, _sqlExpressionFactory.Constant(1))));
}
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(extract));
}
}
return(null);
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
protected override ShapedQueryExpression TranslateCount(ShapedQueryExpression source, LambdaExpression predicate)
{
Check.NotNull(source, nameof(source));
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.IsDistinct ||
selectExpression.Limit != null ||
selectExpression.Offset != null)
{
return(null);
}
if (predicate != null)
{
source = TranslateWhere(source, predicate);
if (source == null)
{
return(null);
}
}
var translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Function("COUNT", new[] { _sqlExpressionFactory.Constant(1) }, typeof(int)));
var projectionMapping = new Dictionary <ProjectionMember, Expression> {
{ new ProjectionMember(), translation }
};
selectExpression.ClearOrdering();
selectExpression.ReplaceProjectionMapping(projectionMapping);
return(source.UpdateShaperExpression(new ProjectionBindingExpression(source.QueryExpression, new ProjectionMember(), typeof(int))));
}
public virtual SqlExpression Translate([NotNull] Expression expression)
{
Check.NotNull(expression, nameof(expression));
var result = Visit(expression);
if (result is SqlExpression translation)
{
if (translation is SqlUnaryExpression sqlUnaryExpression &&
sqlUnaryExpression.OperatorType == ExpressionType.Convert &&
sqlUnaryExpression.Type == typeof(object))
{
translation = sqlUnaryExpression.Operand;
}
translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(translation);
if (translation.TypeMapping == null)
{
// The return type is not-mappable hence return null
return(null);
}
_sqlTypeMappingVerifyingExpressionVisitor.Visit(translation);
return(translation);
}
return(null);
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
protected override ShapedQueryExpression TranslateCount(ShapedQueryExpression source, LambdaExpression predicate)
{
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.IsDistinct ||
selectExpression.Limit != null ||
selectExpression.Offset != null)
{
throw new InvalidOperationException(CoreStrings.TranslationFailed(predicate.Print()));
}
if (predicate != null)
{
source = TranslateWhere(source, predicate);
}
var translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Function("COUNT", new[] { _sqlExpressionFactory.Constant(1) }, typeof(int)));
var projectionMapping = new Dictionary <ProjectionMember, Expression> {
{ new ProjectionMember(), translation }
};
selectExpression.ClearOrdering();
selectExpression.ReplaceProjectionMapping(projectionMapping);
source.ShaperExpression = new ProjectionBindingExpression(source.QueryExpression, new ProjectionMember(), typeof(int));
return(source);
}
public virtual SqlExpression Translate(Expression expression)
{
var result = Visit(expression);
if (result is SqlExpression translation)
{
if (translation is SqlUnaryExpression sqlUnaryExpression &&
sqlUnaryExpression.OperatorType == ExpressionType.Convert &&
sqlUnaryExpression.Type == typeof(object))
{
translation = sqlUnaryExpression.Operand;
}
translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(translation);
if (translation is SqlConstantExpression &&
translation.TypeMapping == null)
{
// Non-mappable constant
return(null);
}
_sqlVerifyingExpressionVisitor.Visit(translation);
return(translation);
}
return(null);
}
private SqlExpression TranslateStaticFunction(string function, IReadOnlyList <SqlExpression> arguments, System.Type returnType)
{
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Function(
function,
arguments,
returnType)));
}
public SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
if (method == IPAddressParse)
{
return(_sqlExpressionFactory.Convert(arguments[0], typeof(IPAddress), _sqlExpressionFactory.FindMapping(typeof(IPAddress))));
}
if (method == PhysicalAddressParse)
{
return(_sqlExpressionFactory.Convert(arguments[0], typeof(PhysicalAddress), _sqlExpressionFactory.FindMapping(typeof(PhysicalAddress))));
}
if (method.DeclaringType != typeof(NpgsqlNetworkExtensions))
{
return(null);
}
return(method.Name switch
{
nameof(NpgsqlNetworkExtensions.LessThan) => _sqlExpressionFactory.LessThan(arguments[1], arguments[2]),
nameof(NpgsqlNetworkExtensions.LessThanOrEqual) => _sqlExpressionFactory.LessThanOrEqual(arguments[1], arguments[2]),
nameof(NpgsqlNetworkExtensions.GreaterThanOrEqual) => _sqlExpressionFactory.GreaterThanOrEqual(arguments[1], arguments[2]),
nameof(NpgsqlNetworkExtensions.GreaterThan) => _sqlExpressionFactory.GreaterThan(arguments[1], arguments[2]),
nameof(NpgsqlNetworkExtensions.ContainedBy) => BoolReturningOnTwoNetworkTypes("<<"),
nameof(NpgsqlNetworkExtensions.ContainedByOrEqual) => BoolReturningOnTwoNetworkTypes("<<="),
nameof(NpgsqlNetworkExtensions.Contains) => BoolReturningOnTwoNetworkTypes(">>"),
nameof(NpgsqlNetworkExtensions.ContainsOrEqual) => BoolReturningOnTwoNetworkTypes(">>="),
nameof(NpgsqlNetworkExtensions.ContainsOrContainedBy) => BoolReturningOnTwoNetworkTypes("&&"),
// TODO: Hack, see #1118
nameof(NpgsqlNetworkExtensions.BitwiseNot) => new SqlUnaryExpression(ExpressionType.Negate,
arguments[1],
arguments[1].Type,
arguments[1].TypeMapping),
nameof(NpgsqlNetworkExtensions.BitwiseAnd) => _sqlExpressionFactory.And(arguments[1], arguments[2]),
nameof(NpgsqlNetworkExtensions.BitwiseOr) => _sqlExpressionFactory.Or(arguments[1], arguments[2]),
// Add/Subtract accept inet + int, so we can't use the default type mapping inference logic which assumes
// same-typed operands
nameof(NpgsqlNetworkExtensions.Add)
=> new SqlBinaryExpression(
ExpressionType.Add,
_sqlExpressionFactory.ApplyDefaultTypeMapping(arguments[1]),
_sqlExpressionFactory.ApplyDefaultTypeMapping(arguments[2]),
arguments[1].Type,
arguments[1].TypeMapping),
nameof(NpgsqlNetworkExtensions.Subtract) when arguments[2].Type == typeof(int)
public SqlExpression Translate(SelectExpression selectExpression, Expression expression)
{
_selectExpression = selectExpression;
var translation = (SqlExpression)Visit(expression);
_selectExpression = null;
translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(translation);
_sqlVerifyingExpressionVisitor.Visit(translation);
return(translation);
}
/// <inheritdoc />
public virtual SqlExpression Translate(
IModel model, SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
Check.NotNull(model, nameof(model));
Check.NotNull(method, nameof(method));
Check.NotNull(arguments, nameof(arguments));
var dbFunction = model.FindDbFunction(method);
if (dbFunction != null)
{
return(dbFunction.Translation?.Invoke(
arguments.Select(e => _sqlExpressionFactory.ApplyDefaultTypeMapping(e)).ToList())
?? _sqlExpressionFactory.Function(
dbFunction.Schema,
dbFunction.Name,
arguments,
nullable: true,
argumentsPropagateNullability: arguments.Select(a => false).ToList(),
method.ReturnType));
}
return(_plugins.Concat(_translators)
.Select(t => t.Translate(instance, method, arguments))
.FirstOrDefault(t => t != null));
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
Check.NotNull(method, nameof(method));
Check.NotNull(arguments, nameof(arguments));
if (_methodInfoDataLengthMapping.Contains(method))
{
var argument = arguments[1];
if (argument.TypeMapping == null)
{
argument = _sqlExpressionFactory.ApplyDefaultTypeMapping(argument);
}
if (_longReturningTypes.Contains(argument.TypeMapping.StoreType))
{
var result = _sqlExpressionFactory.Function(
"DATALENGTH",
arguments.Skip(1),
nullable: true,
argumentsPropagateNullability: new[] { true },
typeof(long));
return(_sqlExpressionFactory.Convert(result, method.ReturnType.UnwrapNullableType()));
}
return(_sqlExpressionFactory.Function(
"DATALENGTH",
arguments.Skip(1),
nullable: true,
argumentsPropagateNullability: new[] { true },
method.ReturnType.UnwrapNullableType()));
}
return(null);
}
public virtual SqlExpression Translate(
SqlExpression instance,
MethodInfo method,
IReadOnlyList <SqlExpression> arguments)
{
if (s_supportedMethods.TryGetValue(method, out var sqlFunctionName))
{
if (sqlFunctionName == "ROUND")
{
// Only rounding mode AwayFromZero can be evaluated server side.
// Trying to use a different rounding mode in a query will fail.
if (arguments[arguments.Count - 1] is SqlConstantExpression c &&
c.Value is MidpointRounding mode &&
mode == MidpointRounding.AwayFromZero)
{
arguments = arguments.ToList().GetRange(0, arguments.Count - 1);
}
else
{
return(null);
}
}
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Function(
sqlFunctionName,
arguments,
method.ReturnType)));
}
private SqlExpression TranslateNoArgFunction(string function, SqlExpression instance, System.Type returnType)
{
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Function(
function,
new[] { instance },
returnType)));
}
public SqlExpression Translate(Expression expression)
{
var translation = (SqlExpression)Visit(expression);
if (translation is SqlUnaryExpression sqlUnaryExpression &&
sqlUnaryExpression.OperatorType == ExpressionType.Convert &&
sqlUnaryExpression.Type == typeof(object))
{
translation = sqlUnaryExpression.Operand;
}
translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(translation);
_sqlVerifyingExpressionVisitor.Visit(translation);
return(translation);
}
private SqlExpression TranslateSystemFunction(string function, SqlExpression instance, SqlExpression pattern, Type returnType)
{
Check.NotNull(instance, nameof(instance));
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Function(
function,
new[] { instance, pattern },
returnType)));
}
protected override ShapedQueryExpression TranslateGroupBy(
ShapedQueryExpression source,
LambdaExpression keySelector,
LambdaExpression elementSelector,
LambdaExpression resultSelector)
{
var selectExpression = (SelectExpression)source.QueryExpression;
selectExpression.PrepareForAggregate();
var remappedKeySelector = RemapLambdaBody(source, keySelector);
var translatedKey = TranslateGroupingKey(remappedKeySelector)
?? (remappedKeySelector is ConstantExpression ? remappedKeySelector : null);
if (translatedKey != null)
{
if (elementSelector != null)
{
source = TranslateSelect(source, elementSelector);
}
var sqlKeySelector = translatedKey is ConstantExpression
? _sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.Constant(1))
: translatedKey;
var appliedKeySelector = selectExpression.ApplyGrouping(sqlKeySelector);
translatedKey = translatedKey is ConstantExpression ? translatedKey : appliedKeySelector;
source.ShaperExpression = new GroupByShaperExpression(translatedKey, source.ShaperExpression);
if (resultSelector == null)
{
return(source);
}
var keyAccessExpression = Expression.MakeMemberAccess(
source.ShaperExpression,
source.ShaperExpression.Type.GetTypeInfo().GetMember(nameof(IGrouping <int, int> .Key))[0]);
var original1 = resultSelector.Parameters[0];
var original2 = resultSelector.Parameters[1];
var newResultSelectorBody = new ReplacingExpressionVisitor(
new Dictionary <Expression, Expression> {
{ original1, keyAccessExpression },
{ original2, source.ShaperExpression }
}).Visit(resultSelector.Body);
source.ShaperExpression = _projectionBindingExpressionVisitor.Translate(selectExpression, newResultSelectorBody);
return(source);
}
throw new InvalidOperationException();
}
public SqlExpression Translate(Expression expression)
{
var translation = (SqlExpression)Visit(expression);
translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(translation);
_sqlVerifyingExpressionVisitor.Visit(translation);
return(translation);
}
protected override Expression VisitExtension(Expression extensionExpression)
{
if (extensionExpression is SelectExpression selectExpression)
{
if (IsZero(selectExpression.Limit) &&
IsZero(selectExpression.Offset))
{
return(selectExpression.Update(
selectExpression.Projection,
selectExpression.Tables,
selectExpression.GroupBy.Count > 0
? selectExpression.Predicate
: _sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.Constant(false)),
selectExpression.GroupBy,
selectExpression.GroupBy.Count > 0
? _sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.Constant(false))
: null,
new List <OrderingExpression>(0),
limit: null,
offset: null));
}
bool IsZero(SqlExpression?sqlExpression)
{
switch (sqlExpression)
{
case SqlConstantExpression constant
when constant.Value is int intValue:
return(intValue == 0);
case SqlParameterExpression parameter:
_canCache = false;
return(_parameterValues[parameter.Name] is int value && value == 0);
default:
return(false);
}
}
}
return(base.VisitExtension(extensionExpression));
}
protected override ShapedQueryExpression TranslateAverage(ShapedQueryExpression source, LambdaExpression selector, Type resultType)
{
var selectExpression = (SelectExpression)source.QueryExpression;
if (selectExpression.Limit != null ||
selectExpression.Offset != null)
{
selectExpression.PushdownIntoSubQuery();
}
if (selector != null)
{
source = TranslateSelect(source, selector);
}
var projection = (SqlExpression)selectExpression.GetProjectionExpression(new ProjectionMember());
var inputType = projection.Type.UnwrapNullableType();
if (inputType == typeof(int) ||
inputType == typeof(long))
{
projection = _sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Convert(projection, typeof(double)));
}
if (inputType == typeof(float))
{
projection = _sqlExpressionFactory.Convert(
_sqlExpressionFactory.Function(
"AVG", new[] { projection }, typeof(double), null),
projection.Type,
projection.TypeMapping);
}
else
{
projection = _sqlExpressionFactory.Function(
"AVG", new[] { projection }, projection.Type, projection.TypeMapping);
}
return(AggregateResultShaper(source, projection, throwOnNullResult: true, resultType));
}
private SqlExpression ConvertToValue(SqlExpression sqlExpression, bool condition)
=> condition
? _sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
SimplifyNegatedBinary(sqlExpression),
_sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.Constant(true)))
},
_sqlExpressionFactory.Constant(false))
: sqlExpression;
public virtual SqlExpression?Translate(
IModel model,
SqlExpression?instance,
MethodInfo method,
IReadOnlyList <SqlExpression> arguments,
IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
Check.NotNull(model, nameof(model));
Check.NotNull(method, nameof(method));
Check.NotNull(arguments, nameof(arguments));
Check.NotNull(logger, nameof(logger));
var dbFunction = model.FindDbFunction(method);
if (dbFunction != null)
{
if (dbFunction.Translation != null)
{
return(dbFunction.Translation.Invoke(
arguments.Select(e => _sqlExpressionFactory.ApplyDefaultTypeMapping(e)).ToList()));
}
var argumentsPropagateNullability = dbFunction.Parameters.Select(p => p.PropagatesNullability);
if (dbFunction.IsBuiltIn)
{
return(_sqlExpressionFactory.Function(
dbFunction.Name,
arguments,
dbFunction.IsNullable,
argumentsPropagateNullability,
method.ReturnType.UnwrapNullableType()));
}
return(dbFunction.Schema is null
? _sqlExpressionFactory.Function(
dbFunction.Name,
arguments,
dbFunction.IsNullable,
argumentsPropagateNullability,
method.ReturnType.UnwrapNullableType())
: _sqlExpressionFactory.Function(
dbFunction.Schema,
dbFunction.Name,
arguments,
dbFunction.IsNullable,
argumentsPropagateNullability,
method.ReturnType.UnwrapNullableType()));
}
return(_plugins.Concat(_translators)
.Select(t => t.Translate(instance, method, arguments, logger))
.FirstOrDefault(t => t != null));
}
public override SqlExpression TranslateLongCount(Expression expression = null)
{
if (expression != null)
{
// TODO: Translate Count with predicate for GroupBy
return(null);
}
return(_sqlExpressionFactory.ApplyDefaultTypeMapping(
_sqlExpressionFactory.Function("COUNT_BIG", new[] { _sqlExpressionFactory.Fragment("*") }, typeof(long))));
}
private Expression ConvertToValue(SqlExpression sqlExpression, bool condition)
{
return(condition
? _sqlExpressionFactory.Case(new[]
{
new CaseWhenClause(
sqlExpression,
_sqlExpressionFactory.ApplyDefaultTypeMapping(_sqlExpressionFactory.Constant(true)))
},
_sqlExpressionFactory.Constant(false))
: sqlExpression);
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
if (_methodInfos.Any(m => Equals(method, m)))
{
var match = _sqlExpressionFactory.ApplyDefaultTypeMapping(arguments[1]);
var pattern = InferStringTypeMappingOrApplyDefault(
arguments[2],
match.TypeMapping);
var excapeChar = arguments.Count == 4
? InferStringTypeMappingOrApplyDefault(
arguments[3],
match.TypeMapping)
: null;
return(_sqlExpressionFactory.Like(
match,
pattern,
excapeChar));
}
return(null);
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments, IDiagnosticsLogger <Microsoft.EntityFrameworkCore.DbLoggerCategory.Query> logger)
{
if (_methodInfos.Any(m => Equals(method, m)))
{
var match = _sqlExpressionFactory.ApplyDefaultTypeMapping(arguments[1]);
var pattern = InferStringTypeMappingOrApplyDefault(
arguments[2],
match.TypeMapping);
var excapeChar = arguments.Count == 4
? InferStringTypeMappingOrApplyDefault(
arguments[3],
match.TypeMapping)
: null;
return(_sqlExpressionFactory.Like(
match,
pattern,
excapeChar));
}
return(null);
}
public SqlExpression Translate(Expression expression)
{
var result = Visit(expression);
if (result is SqlExpression translation)
{
translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(translation);
_sqlVerifyingExpressionVisitor.Visit(translation);
return(translation);
}
return(null);
}
/// <inheritdoc />
public SqlExpression Translate(SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
if (!MethodInfoDatePartMapping.TryGetValue(method, out var datePart))
{
return(null);
}
var interval = arguments[0];
if (instance is null || interval is null)
{
return(null);
}
// Note: ideally we'd simply generate a PostgreSQL interval expression, but the .NET mapping of that is TimeSpan,
// which does not work for months, years, etc. So we generate special fragments instead.
if (interval is SqlConstantExpression constantExpression)
{
// We generate constant intervals as INTERVAL '1 days'
if (constantExpression.Type == typeof(double) &&
((double)constantExpression.Value >= int.MaxValue ||
(double)constantExpression.Value <= int.MinValue))
{
return(null);
}
interval = _sqlExpressionFactory.Fragment(FormattableString.Invariant($"INTERVAL '{constantExpression.Value} {datePart}'"));
}
else
{
// For non-constants, we can't parameterize INTERVAL '1 days'. Instead, we use CAST($1 || ' days' AS interval).
// Note that a make_interval() function also exists, but accepts only int (for all fields except for
// seconds), so we don't use it.
// Note: we instantiate SqlBinaryExpression manually rather than via sqlExpressionFactory because
// of the non-standard Add expression (concatenate int with text)
interval = _sqlExpressionFactory.Convert(
new SqlBinaryExpression(
ExpressionType.Add,
_sqlExpressionFactory.ApplyDefaultTypeMapping(interval),
_sqlExpressionFactory.Constant(' ' + datePart, _textMapping),
typeof(string),
_textMapping),
typeof(TimeSpan),
_intervalMapping);
}
return(_sqlExpressionFactory.Add(instance, interval, instance.TypeMapping));
}
/// <summary>
/// This is an internal API that supports the Entity Framework Core infrastructure and not subject to
/// the same compatibility standards as public APIs. It may be changed or removed without notice in
/// any release. You should only use it directly in your code with extreme caution and knowing that
/// doing so can result in application failures when updating to a new Entity Framework Core release.
/// </summary>
public virtual SqlExpression?Translate(
SqlExpression?instance,
MethodInfo method,
IReadOnlyList <SqlExpression> arguments,
IDiagnosticsLogger <DbLoggerCategory.Query> logger)
{
Check.NotNull(method, nameof(method));
Check.NotNull(arguments, nameof(arguments));
Check.NotNull(logger, nameof(logger));
if (_functionMapping.TryGetValue(method, out var functionName))
{
var propertyReference = arguments[1];
if (!(propertyReference is ColumnExpression))
{
throw new InvalidOperationException(SqlServerStrings.InvalidColumnNameForFreeText);
}
var typeMapping = propertyReference.TypeMapping;
var freeText = propertyReference.Type == arguments[2].Type
? _sqlExpressionFactory.ApplyTypeMapping(arguments[2], typeMapping)
: _sqlExpressionFactory.ApplyDefaultTypeMapping(arguments[2]);
var functionArguments = new List <SqlExpression> {
propertyReference, freeText
};
if (arguments.Count == 4)
{
functionArguments.Add(
_sqlExpressionFactory.Fragment($"LANGUAGE {((SqlConstantExpression)arguments[3]).Value}"));
}
return(_sqlExpressionFactory.Function(
functionName,
functionArguments,
nullable: true,
// TODO: don't propagate for now
argumentsPropagateNullability: functionArguments.Select(a => false).ToList(),
typeof(bool)));
}
return(null);
}
public virtual SqlExpression Translate(IModel model, SqlExpression instance, MethodInfo method, IReadOnlyList <SqlExpression> arguments)
{
var dbFunction = model.FindDbFunction(method);
if (dbFunction != null)
{
return(dbFunction.Translation?.Invoke(
arguments.Select(e => _sqlExpressionFactory.ApplyDefaultTypeMapping(e)).ToList())
?? _sqlExpressionFactory.Function(
dbFunction.Schema,
dbFunction.Name,
arguments,
method.ReturnType));
}
return(_plugins.Concat(_translators)
.Select(t => t.Translate(instance, method, arguments))
.FirstOrDefault(t => t != null));
}
private SqlExpression TranslateInternal(Expression expression)
{
var result = Visit(expression);
if (result is SqlExpression translation)
{
translation = _sqlExpressionFactory.ApplyDefaultTypeMapping(translation);
if (translation.TypeMapping == null)
{
// The return type is not-mappable hence return null
return(null);
}
_sqlVerifyingExpressionVisitor.Visit(translation);
return(translation);
}
return(null);
}
