/// <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 (_indexOfMethodInfo.Equals(method))
{
var argument = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, argument);
return(_sqlExpressionFactory.Subtract(
_sqlExpressionFactory.Function(
"instr",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(argument, stringTypeMapping)
},
nullable: true,
argumentsPropagateNullability: new[] { true, true },
method.ReturnType),
_sqlExpressionFactory.Constant(1)));
}
if (_replaceMethodInfo.Equals(method))
{
var firstArgument = arguments[0];
var secondArgument = arguments[1];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, firstArgument, secondArgument);
return(_sqlExpressionFactory.Function(
"replace",
new[]
{
_sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(firstArgument, stringTypeMapping),
_sqlExpressionFactory.ApplyTypeMapping(secondArgument, stringTypeMapping)
},
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
stringTypeMapping));
}
if (_toLowerMethodInfo.Equals(method) ||
_toUpperMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
_toLowerMethodInfo.Equals(method) ? "lower" : "upper",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
method.ReturnType,
instance.TypeMapping));
}
if (_substringMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
"substr",
new[] { instance, _sqlExpressionFactory.Add(arguments[0], _sqlExpressionFactory.Constant(1)), arguments[1] },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
instance.TypeMapping));
}
if (_isNullOrWhiteSpaceMethodInfo.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Equal(
_sqlExpressionFactory.Function(
"trim",
new[] { argument },
nullable: true,
argumentsPropagateNullability: new[] { true },
argument.Type,
argument.TypeMapping),
_sqlExpressionFactory.Constant(string.Empty))));
}
if (_trimStartMethodInfoWithoutArgs?.Equals(method) == true ||
_trimStartMethodInfoWithCharArg?.Equals(method) == true ||
_trimStartMethodInfoWithCharArrayArg.Equals(method))
{
return(ProcessTrimMethod(instance, arguments, "ltrim"));
}
if (_trimEndMethodInfoWithoutArgs?.Equals(method) == true ||
_trimEndMethodInfoWithCharArg?.Equals(method) == true ||
_trimEndMethodInfoWithCharArrayArg.Equals(method))
{
return(ProcessTrimMethod(instance, arguments, "rtrim"));
}
if (_trimMethodInfoWithoutArgs?.Equals(method) == true ||
_trimMethodInfoWithCharArg?.Equals(method) == true ||
_trimMethodInfoWithCharArrayArg.Equals(method))
{
return(ProcessTrimMethod(instance, arguments, "trim"));
}
if (_containsMethodInfo.Equals(method))
{
var pattern = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, pattern);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
pattern = _sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping);
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Equal(
pattern,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"instr",
new[] { instance, pattern },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
typeof(int)),
_sqlExpressionFactory.Constant(0))));
}
if (_firstOrDefaultMethodInfoWithoutArgs.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"substr",
new[] { argument, _sqlExpressionFactory.Constant(1), _sqlExpressionFactory.Constant(1) },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType));
}
if (_lastOrDefaultMethodInfoWithoutArgs.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"substr",
new[] { argument,
_sqlExpressionFactory.Function(
"length",
new[] { argument },
nullable: true,
argumentsPropagateNullability: new[] { true },
typeof(int)),
_sqlExpressionFactory.Constant(1) },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType));
}
if (_startsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], true));
}
if (_endsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], false));
}
return(null);
}
protected override Expression VisitSqlBinary(SqlBinaryExpression sqlBinaryExpression)
{
Check.NotNull(sqlBinaryExpression, nameof(sqlBinaryExpression));
_isNullable = false;
var canOptimize = _canOptimize;
// for SqlServer we could also allow optimize on children of ExpressionType.Equal
// because they get converted to CASE blocks anyway, but for other providers it's incorrect
// once/if null semantics optimizations are provider-specific we can enable it
_canOptimize = _canOptimize && (sqlBinaryExpression.OperatorType == ExpressionType.AndAlso ||
sqlBinaryExpression.OperatorType == ExpressionType.OrElse);
var nonNullableColumns = new List <ColumnExpression>();
if (sqlBinaryExpression.OperatorType == ExpressionType.AndAlso)
{
nonNullableColumns = FindNonNullableColumns(sqlBinaryExpression.Left);
}
var newLeft = (SqlExpression)Visit(sqlBinaryExpression.Left);
var leftNullable = _isNullable;
_isNullable = false;
if (nonNullableColumns.Count > 0)
{
_nonNullableColumns.AddRange(nonNullableColumns);
}
var newRight = (SqlExpression)Visit(sqlBinaryExpression.Right);
var rightNullable = _isNullable;
foreach (var nonNullableColumn in nonNullableColumns)
{
_nonNullableColumns.Remove(nonNullableColumn);
}
if (sqlBinaryExpression.OperatorType == ExpressionType.Coalesce)
{
_isNullable = leftNullable && rightNullable;
_canOptimize = canOptimize;
return(sqlBinaryExpression.Update(newLeft, newRight));
}
if (sqlBinaryExpression.OperatorType == ExpressionType.Add &&
sqlBinaryExpression.Type == typeof(string))
{
if (leftNullable)
{
newLeft = newLeft is SqlConstantExpression
? _sqlExpressionFactory.Constant(string.Empty)
: newLeft is ColumnExpression || newLeft is SqlParameterExpression
? _sqlExpressionFactory.Coalesce(newLeft, _sqlExpressionFactory.Constant(string.Empty))
: newLeft;
}
if (rightNullable)
{
newRight = newRight is SqlConstantExpression
? _sqlExpressionFactory.Constant(string.Empty)
: newRight is ColumnExpression || newRight is SqlParameterExpression
? _sqlExpressionFactory.Coalesce(newRight, _sqlExpressionFactory.Constant(string.Empty))
: newRight;
}
return(sqlBinaryExpression.Update(newLeft, newRight));
}
if (sqlBinaryExpression.OperatorType == ExpressionType.Equal ||
sqlBinaryExpression.OperatorType == ExpressionType.NotEqual)
{
var leftConstantNull = newLeft is SqlConstantExpression leftConstant && leftConstant.Value == null;
var rightConstantNull = newRight is SqlConstantExpression rightConstant && rightConstant.Value == null;
// a == null -> a IS NULL
// a != null -> a IS NOT NULL
if (rightConstantNull)
{
_isNullable = false;
_canOptimize = canOptimize;
return(sqlBinaryExpression.OperatorType == ExpressionType.Equal
? _sqlExpressionFactory.IsNull(newLeft)
: _sqlExpressionFactory.IsNotNull(newLeft));
}
// null == a -> a IS NULL
// null != a -> a IS NOT NULL
if (leftConstantNull)
{
_isNullable = false;
_canOptimize = canOptimize;
return(sqlBinaryExpression.OperatorType == ExpressionType.Equal
? _sqlExpressionFactory.IsNull(newRight)
: _sqlExpressionFactory.IsNotNull(newRight));
}
var leftUnary = newLeft as SqlUnaryExpression;
var rightUnary = newRight as SqlUnaryExpression;
var leftNegated = leftUnary?.IsLogicalNot() == true;
var rightNegated = rightUnary?.IsLogicalNot() == true;
if (leftNegated)
{
newLeft = leftUnary.Operand;
}
if (rightNegated)
{
newRight = rightUnary.Operand;
}
var leftIsNull = _sqlExpressionFactory.IsNull(newLeft);
var rightIsNull = _sqlExpressionFactory.IsNull(newRight);
// optimized expansion which doesn't distinguish between null and false
if (canOptimize &&
sqlBinaryExpression.OperatorType == ExpressionType.Equal &&
!leftNegated &&
!rightNegated)
{
// when we use optimized form, the result can still be nullable
if (leftNullable && rightNullable)
{
_isNullable = true;
_canOptimize = canOptimize;
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Equal(newLeft, newRight),
_sqlExpressionFactory.AndAlso(leftIsNull, rightIsNull)));
}
if ((leftNullable && !rightNullable) ||
(!leftNullable && rightNullable))
{
_isNullable = true;
_canOptimize = canOptimize;
return(_sqlExpressionFactory.Equal(newLeft, newRight));
}
}
// doing a full null semantics rewrite - removing all nulls from truth table
// this will NOT be correct once we introduce simplified null semantics
_isNullable = false;
_canOptimize = canOptimize;
if (sqlBinaryExpression.OperatorType == ExpressionType.Equal)
{
if (!leftNullable &&
!rightNullable)
{
// a == b <=> !a == !b -> a == b
// !a == b <=> a == !b -> a != b
return(leftNegated == rightNegated
? _sqlExpressionFactory.Equal(newLeft, newRight)
: _sqlExpressionFactory.NotEqual(newLeft, newRight));
}
if (leftNullable && rightNullable)
{
// ?a == ?b <=> !(?a) == !(?b) -> [(a == b) && (a != null && b != null)] || (a == null && b == null))
// !(?a) == ?b <=> ?a == !(?b) -> [(a != b) && (a != null && b != null)] || (a == null && b == null)
return(leftNegated == rightNegated
? ExpandNullableEqualNullable(newLeft, newRight, leftIsNull, rightIsNull)
: ExpandNegatedNullableEqualNullable(newLeft, newRight, leftIsNull, rightIsNull));
}
if (leftNullable && !rightNullable)
{
// ?a == b <=> !(?a) == !b -> (a == b) && (a != null)
// !(?a) == b <=> ?a == !b -> (a != b) && (a != null)
return(leftNegated == rightNegated
? ExpandNullableEqualNonNullable(newLeft, newRight, leftIsNull)
: ExpandNegatedNullableEqualNonNullable(newLeft, newRight, leftIsNull));
}
if (rightNullable && !leftNullable)
{
// a == ?b <=> !a == !(?b) -> (a == b) && (b != null)
// !a == ?b <=> a == !(?b) -> (a != b) && (b != null)
return(leftNegated == rightNegated
? ExpandNullableEqualNonNullable(newLeft, newRight, rightIsNull)
: ExpandNegatedNullableEqualNonNullable(newLeft, newRight, rightIsNull));
}
}
if (sqlBinaryExpression.OperatorType == ExpressionType.NotEqual)
{
if (!leftNullable &&
!rightNullable)
{
// a != b <=> !a != !b -> a != b
// !a != b <=> a != !b -> a == b
return(leftNegated == rightNegated
? _sqlExpressionFactory.NotEqual(newLeft, newRight)
: _sqlExpressionFactory.Equal(newLeft, newRight));
}
if (leftNullable && rightNullable)
{
// ?a != ?b <=> !(?a) != !(?b) -> [(a != b) || (a == null || b == null)] && (a != null || b != null)
// !(?a) != ?b <=> ?a != !(?b) -> [(a == b) || (a == null || b == null)] && (a != null || b != null)
return(leftNegated == rightNegated
? ExpandNullableNotEqualNullable(newLeft, newRight, leftIsNull, rightIsNull)
: ExpandNegatedNullableNotEqualNullable(newLeft, newRight, leftIsNull, rightIsNull));
}
if (leftNullable)
{
// ?a != b <=> !(?a) != !b -> (a != b) || (a == null)
// !(?a) != b <=> ?a != !b -> (a == b) || (a == null)
return(leftNegated == rightNegated
? ExpandNullableNotEqualNonNullable(newLeft, newRight, leftIsNull)
: ExpandNegatedNullableNotEqualNonNullable(newLeft, newRight, leftIsNull));
}
if (rightNullable)
{
// a != ?b <=> !a != !(?b) -> (a != b) || (b == null)
// !a != ?b <=> a != !(?b) -> (a == b) || (b == null)
return(leftNegated == rightNegated
? ExpandNullableNotEqualNonNullable(newLeft, newRight, rightIsNull)
: ExpandNegatedNullableNotEqualNonNullable(newLeft, newRight, rightIsNull));
}
}
}
_isNullable = leftNullable || rightNullable;
_canOptimize = canOptimize;
return(sqlBinaryExpression.Update(newLeft, newRight));
}
public override Expression Visit(Expression expression)
{
if (expression is InExpression inExpression)
{
var inValues = new List <object>();
var hasNullValue = false;
CoreTypeMapping typeMapping = null;
switch (inExpression.Values)
{
case SqlConstantExpression sqlConstant:
{
typeMapping = sqlConstant.TypeMapping;
var values = (IEnumerable)sqlConstant.Value;
foreach (var value in values)
{
if (value == null)
{
hasNullValue = true;
continue;
}
inValues.Add(value);
}
}
break;
case SqlParameterExpression sqlParameter:
{
typeMapping = sqlParameter.TypeMapping;
var values = (IEnumerable)_parametersValues[sqlParameter.Name];
foreach (var value in values)
{
if (value == null)
{
hasNullValue = true;
continue;
}
inValues.Add(value);
}
}
break;
}
var updatedInExpression = inValues.Count > 0
? _sqlExpressionFactory.In(
(SqlExpression)Visit(inExpression.Item),
_sqlExpressionFactory.Constant(inValues, typeMapping),
inExpression.IsNegated)
: null;
var nullCheckExpression = hasNullValue
? _sqlExpressionFactory.IsNull(inExpression.Item)
: null;
if (updatedInExpression != null &&
nullCheckExpression != null)
{
return(_sqlExpressionFactory.OrElse(updatedInExpression, nullCheckExpression));
}
if (updatedInExpression == null &&
nullCheckExpression == null)
{
return(_sqlExpressionFactory.Equal(_sqlExpressionFactory.Constant(true), _sqlExpressionFactory.Constant(false)));
}
return((SqlExpression)updatedInExpression ?? nullCheckExpression);
}
return(base.Visit(expression));
}
private SqlExpression BuildCompareToExpression(SqlExpression sqlExpression)
{
return(_sqlExpressionFactory.Equal(sqlExpression, _sqlExpressionFactory.Constant(true)));
}
private SqlBinaryExpression VisitSqlBinaryExpression(SqlBinaryExpression sqlBinaryExpression)
{
_isNullable = false;
var nonNullableColumns = new List <ColumnExpression>();
if (sqlBinaryExpression.OperatorType == ExpressionType.AndAlso)
{
nonNullableColumns = FindNonNullableColumns(sqlBinaryExpression.Left);
}
var newLeft = (SqlExpression)Visit(sqlBinaryExpression.Left);
var leftNullable = _isNullable;
_isNullable = false;
if (nonNullableColumns.Count > 0)
{
_nonNullableColumns.AddRange(nonNullableColumns);
}
var newRight = (SqlExpression)Visit(sqlBinaryExpression.Right);
var rightNullable = _isNullable;
foreach (var nonNullableColumn in nonNullableColumns)
{
_nonNullableColumns.Remove(nonNullableColumn);
}
if (sqlBinaryExpression.OperatorType == ExpressionType.Coalesce)
{
_isNullable = leftNullable && rightNullable;
return(sqlBinaryExpression.Update(newLeft, newRight));
}
if (sqlBinaryExpression.OperatorType == ExpressionType.Equal ||
sqlBinaryExpression.OperatorType == ExpressionType.NotEqual)
{
var leftUnary = newLeft as SqlUnaryExpression;
var rightUnary = newRight as SqlUnaryExpression;
var leftNegated = leftUnary?.OperatorType == ExpressionType.Not;
var rightNegated = rightUnary?.OperatorType == ExpressionType.Not;
if (leftNegated)
{
newLeft = leftUnary.Operand;
}
if (rightNegated)
{
newRight = rightUnary.Operand;
}
// TODO: optimize this by looking at subcomponents, e.g. f(a, b) == null <=> a == null || b == null
var leftIsNull = _sqlExpressionFactory.IsNull(newLeft);
var rightIsNull = _sqlExpressionFactory.IsNull(newRight);
// doing a full null semantics rewrite - removing all nulls from truth table
_isNullable = false;
if (sqlBinaryExpression.OperatorType == ExpressionType.Equal)
{
if (!leftNullable &&
!rightNullable)
{
// a == b <=> !a == !b -> a == b
// !a == b <=> a == !b -> a != b
return(leftNegated == rightNegated
? _sqlExpressionFactory.Equal(newLeft, newRight)
: _sqlExpressionFactory.NotEqual(newLeft, newRight));
}
if (leftNullable && rightNullable)
{
// ?a == ?b <=> !(?a) == !(?b) -> [(a == b) && (a != null && b != null)] || (a == null && b == null))
// !(?a) == ?b <=> ?a == !(?b) -> [(a != b) && (a != null && b != null)] || (a == null && b == null)
return(leftNegated == rightNegated
? ExpandNullableEqualNullable(newLeft, newRight, leftIsNull, rightIsNull)
: ExpandNegatedNullableEqualNullable(newLeft, newRight, leftIsNull, rightIsNull));
}
if (leftNullable && !rightNullable)
{
// ?a == b <=> !(?a) == !b -> (a == b) && (a != null)
// !(?a) == b <=> ?a == !b -> (a != b) && (a != null)
return(leftNegated == rightNegated
? ExpandNullableEqualNonNullable(newLeft, newRight, leftIsNull)
: ExpandNegatedNullableEqualNonNullable(newLeft, newRight, leftIsNull));
}
if (rightNullable && !leftNullable)
{
// a == ?b <=> !a == !(?b) -> (a == b) && (b != null)
// !a == ?b <=> a == !(?b) -> (a != b) && (b != null)
return(leftNegated == rightNegated
? ExpandNullableEqualNonNullable(newLeft, newRight, rightIsNull)
: ExpandNegatedNullableEqualNonNullable(newLeft, newRight, rightIsNull));
}
}
if (sqlBinaryExpression.OperatorType == ExpressionType.NotEqual)
{
if (!leftNullable &&
!rightNullable)
{
// a != b <=> !a != !b -> a != b
// !a != b <=> a != !b -> a == b
return(leftNegated == rightNegated
? _sqlExpressionFactory.NotEqual(newLeft, newRight)
: _sqlExpressionFactory.Equal(newLeft, newRight));
}
if (leftNullable && rightNullable)
{
// ?a != ?b <=> !(?a) != !(?b) -> [(a != b) || (a == null || b == null)] && (a != null || b != null)
// !(?a) != ?b <=> ?a != !(?b) -> [(a == b) || (a == null || b == null)] && (a != null || b != null)
return(leftNegated == rightNegated
? ExpandNullableNotEqualNullable(newLeft, newRight, leftIsNull, rightIsNull)
: ExpandNegatedNullableNotEqualNullable(newLeft, newRight, leftIsNull, rightIsNull));
}
if (leftNullable)
{
// ?a != b <=> !(?a) != !b -> (a != b) || (a == null)
// !(?a) != b <=> ?a != !b -> (a == b) || (a == null)
return(leftNegated == rightNegated
? ExpandNullableNotEqualNonNullable(newLeft, newRight, leftIsNull)
: ExpandNegatedNullableNotEqualNonNullable(newLeft, newRight, leftIsNull));
}
if (rightNullable)
{
// a != ?b <=> !a != !(?b) -> (a != b) || (b == null)
// !a != ?b <=> a != !(?b) -> (a == b) || (b == null)
return(leftNegated == rightNegated
? ExpandNullableNotEqualNonNullable(newLeft, newRight, rightIsNull)
: ExpandNegatedNullableNotEqualNonNullable(newLeft, newRight, rightIsNull));
}
}
}
_isNullable = leftNullable || rightNullable;
return(sqlBinaryExpression.Update(newLeft, newRight));
}
/// <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 (_indexOfMethodInfo.Equals(method))
{
var argument = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, argument);
argument = _sqlExpressionFactory.ApplyTypeMapping(argument, stringTypeMapping);
SqlExpression charIndexExpression;
var storeType = stringTypeMapping.StoreType;
if (string.Equals(storeType, "nvarchar(max)", StringComparison.OrdinalIgnoreCase) ||
string.Equals(storeType, "varchar(max)", StringComparison.OrdinalIgnoreCase))
{
charIndexExpression = _sqlExpressionFactory.Function(
"CHARINDEX",
new[] { argument, _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping) },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
typeof(long));
charIndexExpression = _sqlExpressionFactory.Convert(charIndexExpression, typeof(int));
}
else
{
charIndexExpression = _sqlExpressionFactory.Function(
"CHARINDEX",
new[] { argument, _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping) },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
method.ReturnType);
}
charIndexExpression = _sqlExpressionFactory.Subtract(charIndexExpression, _sqlExpressionFactory.Constant(1));
return(_sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
_sqlExpressionFactory.Equal(
argument,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.Constant(0))
},
charIndexExpression));
}
if (_replaceMethodInfo.Equals(method))
{
var firstArgument = arguments[0];
var secondArgument = arguments[1];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, firstArgument, secondArgument);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
firstArgument = _sqlExpressionFactory.ApplyTypeMapping(firstArgument, stringTypeMapping);
secondArgument = _sqlExpressionFactory.ApplyTypeMapping(secondArgument, stringTypeMapping);
return(_sqlExpressionFactory.Function(
"REPLACE",
new[] { instance, firstArgument, secondArgument },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
stringTypeMapping));
}
if (_toLowerMethodInfo.Equals(method) ||
_toUpperMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
_toLowerMethodInfo.Equals(method) ? "LOWER" : "UPPER",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
method.ReturnType,
instance.TypeMapping));
}
if (_substringMethodInfo.Equals(method))
{
return(_sqlExpressionFactory.Function(
"SUBSTRING",
new[]
{
instance,
_sqlExpressionFactory.Add(
arguments[0],
_sqlExpressionFactory.Constant(1)),
arguments[1]
},
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType,
instance.TypeMapping));
}
if (_isNullOrWhiteSpaceMethodInfo.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.IsNull(argument),
_sqlExpressionFactory.Equal(
_sqlExpressionFactory.Function(
"LTRIM",
new[]
{
_sqlExpressionFactory.Function(
"RTRIM",
new[] { argument },
nullable: true,
argumentsPropagateNullability: new[] { true },
argument.Type,
argument.TypeMapping)
},
nullable: true,
argumentsPropagateNullability: new[] { true },
argument.Type,
argument.TypeMapping),
_sqlExpressionFactory.Constant(string.Empty, argument.TypeMapping))));
}
if (_trimStartMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimStartMethodInfoWithCharArrayArg.Equals(method)
// SqlServer LTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"LTRIM",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping));
}
if (_trimEndMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimEndMethodInfoWithCharArrayArg.Equals(method)
// SqlServer RTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"RTRIM",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping));
}
if (_trimMethodInfoWithoutArgs?.Equals(method) == true ||
(_trimMethodInfoWithCharArrayArg.Equals(method)
// SqlServer LTRIM/RTRIM does not take arguments
&& ((arguments[0] as SqlConstantExpression)?.Value as Array)?.Length == 0))
{
return(_sqlExpressionFactory.Function(
"LTRIM",
new[]
{
_sqlExpressionFactory.Function(
"RTRIM",
new[] { instance },
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping)
},
nullable: true,
argumentsPropagateNullability: new[] { true },
instance.Type,
instance.TypeMapping));
}
if (_containsMethodInfo.Equals(method))
{
var pattern = arguments[0];
var stringTypeMapping = ExpressionExtensions.InferTypeMapping(instance, pattern);
instance = _sqlExpressionFactory.ApplyTypeMapping(instance, stringTypeMapping);
pattern = _sqlExpressionFactory.ApplyTypeMapping(pattern, stringTypeMapping);
if (pattern is SqlConstantExpression constantPattern)
{
// Intentionally string.Empty since we don't want to match nulls here.
#pragma warning disable CA1820 // Test for empty strings using string length
if ((string)constantPattern.Value == string.Empty)
#pragma warning restore CA1820 // Test for empty strings using string length
{
return(_sqlExpressionFactory.Constant(true));
}
return(_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"CHARINDEX",
new[] { pattern, instance },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
typeof(int)),
_sqlExpressionFactory.Constant(0)));
}
return(_sqlExpressionFactory.OrElse(
_sqlExpressionFactory.Equal(
pattern,
_sqlExpressionFactory.Constant(string.Empty, stringTypeMapping)),
_sqlExpressionFactory.GreaterThan(
_sqlExpressionFactory.Function(
"CHARINDEX",
new[] { pattern, instance },
nullable: true,
argumentsPropagateNullability: new[] { true, true },
typeof(int)),
_sqlExpressionFactory.Constant(0))));
}
if (_firstOrDefaultMethodInfoWithoutArgs.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"SUBSTRING",
new[] { argument, _sqlExpressionFactory.Constant(1), _sqlExpressionFactory.Constant(1) },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType));
}
if (_lastOrDefaultMethodInfoWithoutArgs.Equals(method))
{
var argument = arguments[0];
return(_sqlExpressionFactory.Function(
"SUBSTRING",
new[] { argument,
_sqlExpressionFactory.Function(
"LEN",
new[] { argument },
nullable: true,
argumentsPropagateNullability: new[] { true },
typeof(int)),
_sqlExpressionFactory.Constant(1) },
nullable: true,
argumentsPropagateNullability: new[] { true, true, true },
method.ReturnType));
}
if (_startsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], true));
}
if (_endsWithMethodInfo.Equals(method))
{
return(TranslateStartsEndsWith(instance, arguments[0], false));
}
return(null);
}
private static SqlExpression GetAndoyerDistance(
SqlExpression left,
SqlExpression right,
Type resultType,
ISqlExpressionFactory sqlExpressionFactory)
{
SqlExpression toDegrees(SqlExpression coord)
=> sqlExpressionFactory.Divide(
sqlExpressionFactory.Multiply(
coord,
sqlExpressionFactory.Function(
"PI",
Array.Empty <SqlExpression>(),
resultType)),
sqlExpressionFactory.Constant(180.0));
SqlExpression xCoord(SqlExpression point)
=> sqlExpressionFactory.Function(
"ST_X",
new[] { point },
resultType);
SqlExpression yCoord(SqlExpression point)
=> sqlExpressionFactory.Function(
"ST_Y",
new[] { point },
resultType);
var c0 = sqlExpressionFactory.Constant(0.0);
var c1 = sqlExpressionFactory.Constant(1.0);
var c2 = sqlExpressionFactory.Constant(2.0);
var c3 = sqlExpressionFactory.Constant(3.0);
var c2Int = sqlExpressionFactory.Constant(2);
var lon1 = toDegrees(xCoord(left));
var lat1 = toDegrees(yCoord(left));
var lon2 = toDegrees(xCoord(right));
var lat2 = toDegrees(yCoord(right));
var g = sqlExpressionFactory.Divide(
sqlExpressionFactory.Subtract(
lat1,
lat2),
c2);
var lambda = sqlExpressionFactory.Divide(
sqlExpressionFactory.Subtract(
lon1,
lon2),
c2);
var f = sqlExpressionFactory.Divide(
sqlExpressionFactory.Add(
lat1,
lat2),
c2);
var sinG2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"SIN",
new[] { g },
resultType),
c2Int
},
resultType);
var cosG2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"COS",
new[] { g },
resultType),
c2Int
},
resultType);
var sinF2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"SIN",
new[] { f },
resultType),
c2Int
},
resultType);
var cosF2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"COS",
new[] { f },
resultType),
c2Int
},
resultType);
var sinL2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"SIN",
new[] { lambda },
resultType),
c2Int
},
resultType);
var cosL2 = sqlExpressionFactory.Function(
"POWER",
new SqlExpression[]
{
sqlExpressionFactory.Function(
"COS",
new[] { lambda },
resultType),
c2Int
},
resultType);
var s = sqlExpressionFactory.Add(
sqlExpressionFactory.Multiply(sinG2, cosL2),
sqlExpressionFactory.Multiply(cosF2, sinL2));
var c = sqlExpressionFactory.Add(
sqlExpressionFactory.Multiply(cosG2, cosL2),
sqlExpressionFactory.Multiply(sinF2, sinL2));
var radiusA = sqlExpressionFactory.Constant(6378137.0);
var radiusB = sqlExpressionFactory.Constant(6356752.3142451793);
var flattening = sqlExpressionFactory.Divide(
sqlExpressionFactory.Subtract(radiusA, radiusB),
radiusA);
var omega = sqlExpressionFactory.Function(
"ATAN",
new[]
{
sqlExpressionFactory.Function(
"SQRT",
new[] { sqlExpressionFactory.Divide(s, c) },
resultType)
},
resultType);
var r3 = sqlExpressionFactory.Divide(
sqlExpressionFactory.Multiply(
c3,
sqlExpressionFactory.Function(
"SQRT",
new[] { sqlExpressionFactory.Multiply(s, c) },
resultType)),
omega);
var d = sqlExpressionFactory.Multiply(
sqlExpressionFactory.Multiply(c2, omega),
radiusA);
var h1 = sqlExpressionFactory.Divide(
sqlExpressionFactory.Subtract(r3, c1),
sqlExpressionFactory.Multiply(c2, c));
var h2 = sqlExpressionFactory.Divide(
sqlExpressionFactory.Add(r3, c1),
sqlExpressionFactory.Multiply(c2, s));
var andoyer = sqlExpressionFactory.Multiply(
d,
sqlExpressionFactory.Add(
c1,
sqlExpressionFactory.Multiply(
flattening,
sqlExpressionFactory.Subtract(
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Multiply(
h1,
sinF2),
cosG2),
sqlExpressionFactory.Multiply(
sqlExpressionFactory.Multiply(
h2,
cosF2),
sinG2)))));
return(sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
sqlExpressionFactory.OrElse(
sqlExpressionFactory.OrElse(
sqlExpressionFactory.AndAlso(
sqlExpressionFactory.Equal(lambda, c0),
sqlExpressionFactory.Equal(g, c0)),
sqlExpressionFactory.Equal(s, c0)),
sqlExpressionFactory.Equal(c, c0)),
c0),
},
andoyer));
}
public static SqlExpression GetStDistanceSphereFunctionCall(
SqlExpression left,
SqlExpression right,
SpatialDistanceAlgorithm algorithm,
Type resultType,
RelationalTypeMapping resultTypeMapping,
ISqlExpressionFactory sqlExpressionFactory,
IMySqlOptions options)
{
if (options.ServerVersion.SupportsSpatialDistanceSphereFunction)
{
if (algorithm == SpatialDistanceAlgorithm.Native)
{
return(sqlExpressionFactory.Function(
"ST_Distance_Sphere",
new[] { left, right },
resultType,
resultTypeMapping));
}
if (algorithm == SpatialDistanceAlgorithm.Andoyer &&
options.ServerVersion.SupportsSpatialDistanceFunctionImplementsAndoyer)
{
// The `ST_Distance()` in MySQL already uses the Andoyer algorithm, when SRID 4326 is associated
// with the geometry.
// CHECK: It might be faster to just run the custom implementation, if `ST_SRID()` does not support
// a second parameter yet (see SetSrid()).
return(sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
sqlExpressionFactory.Equal(
sqlExpressionFactory.Function(
"ST_SRID",
new[] { left },
typeof(int)),
sqlExpressionFactory.Constant(4326)),
GetStDistanceFunctionCall(
left,
right,
resultType,
resultTypeMapping,
sqlExpressionFactory))
},
GetStDistanceFunctionCall(
SetSrid(left, 4326, sqlExpressionFactory, options),
SetSrid(right, 4326, sqlExpressionFactory, options),
resultType,
resultTypeMapping,
sqlExpressionFactory)));
}
if (algorithm == SpatialDistanceAlgorithm.Haversine)
{
// The Haversine algorithm assumes planar coordinates.
return(sqlExpressionFactory.Case(
new[]
{
new CaseWhenClause(
sqlExpressionFactory.Equal(
sqlExpressionFactory.Function(
"ST_SRID",
new[] { left },
typeof(int)),
sqlExpressionFactory.Constant(0)),
GetHaversineDistance(
left,
right,
resultType,
sqlExpressionFactory))
},
GetHaversineDistance(
SetSrid(left, 0, sqlExpressionFactory, options),
SetSrid(right, 0, sqlExpressionFactory, options),
resultType,
sqlExpressionFactory)));
}
}
if (algorithm == SpatialDistanceAlgorithm.Haversine)
{
return(GetHaversineDistance(left, right, resultType, sqlExpressionFactory));
}
return(GetAndoyerDistance(left, right, resultType, sqlExpressionFactory));
}