protected override Expression VisitIn(InExpression inExpression)
{
if (inExpression.Values is SqlParameterExpression spe)
{
var plist = queryContext.ParameterValues[spe.Name] as System.Collections.IList;
// inExpression.Item
// sqlFactory.a
// var ce = sqlFactory.Constant(plist.Select(x => (object));
List <object> list = new List <object>();
foreach (var item in plist)
{
list.Add(item);
}
var ce = sqlFactory.Constant(list, sqlFactory.GetTypeMappingForValue(list.FirstOrDefault()));
// sqlFactory.MakeBinary(ExpressionType.or)
return(inExpression.Update(inExpression.Item, ce, inExpression.Subquery));
//var _relationalCommandBuilder = this.GetPrivateField<IRelationalCommandBuilder>("_relationalCommandBuilder");
//_relationalCommandBuilder.Append(inExpression.IsNegated ? " NOT IN " : " IN ");
//_relationalCommandBuilder.Append("(");
//// _relationalCommandBuilder.Append(spe.Name);
//// we need to expand our list here...
//var prefix = spe.Name;
//var plist = queryContext.ParameterValues[spe.Name] as System.Collections.IList;
//int i = 0;
//foreach(var pv in plist)
//{
// var n = $"{prefix}_{i}";
// queryContext.AddParameter(n, pv);
// if (i != 0)
// {
// _relationalCommandBuilder.Append(", ");
// }
// _relationalCommandBuilder.AppendLine($"@{n}");
// i++;
//}
//_relationalCommandBuilder.Append(")");
// return inExpression;
}
return(inExpression);
}
protected override Expression VisitExtension(Expression extensionExpression)
{
// workaround for issue #18492
var newExpression = base.VisitExtension(extensionExpression);
if (newExpression is SelectExpression newSelectExpression)
{
var changed = false;
var newPredicate = newSelectExpression.Predicate;
var newHaving = newSelectExpression.Having;
if (newSelectExpression.Predicate is SqlConstantExpression predicateConstantExpression &&
predicateConstantExpression.Value is bool predicateBoolValue &&
!predicateBoolValue)
{
changed = true;
newPredicate = SqlExpressionFactory.Equal(
predicateConstantExpression,
SqlExpressionFactory.Constant(true, predicateConstantExpression.TypeMapping));
}
if (newSelectExpression.Having is SqlConstantExpression havingConstantExpression &&
havingConstantExpression.Value is bool havingBoolValue &&
!havingBoolValue)
{
changed = true;
newHaving = SqlExpressionFactory.Equal(
havingConstantExpression,
SqlExpressionFactory.Constant(true, havingConstantExpression.TypeMapping));
}
return(changed
? newSelectExpression.Update(
newSelectExpression.Projection.ToList(),
newSelectExpression.Tables.ToList(),
newPredicate,
newSelectExpression.GroupBy.ToList(),
newHaving,
newSelectExpression.Orderings.ToList(),
newSelectExpression.Limit,
newSelectExpression.Offset,
newSelectExpression.IsDistinct,
newSelectExpression.Alias)
: newSelectExpression);
}
return(newExpression);
}
private Expression DoDecimalCompare(SqlExpression visitedExpression, ExpressionType op, SqlExpression left, SqlExpression right)
{
var actual = SqlExpressionFactory.Function(
name: "ef_compare",
new[] { left, right },
nullable: true,
new[] { true, true },
typeof(int));
var oracle = SqlExpressionFactory.Constant(value: 0);
return(op switch
{
ExpressionType.GreaterThan => SqlExpressionFactory.GreaterThan(left: actual, right: oracle),
ExpressionType.GreaterThanOrEqual => SqlExpressionFactory.GreaterThanOrEqual(left: actual, right: oracle),
ExpressionType.LessThan => SqlExpressionFactory.LessThan(left: actual, right: oracle),
ExpressionType.LessThanOrEqual => SqlExpressionFactory.LessThanOrEqual(left: actual, right: oracle),
_ => visitedExpression
});
protected override Expression VisitExtension(Expression extensionExpression)
{
if (extensionExpression is SelectExpression selectExpression)
{
var newSelectExpression = (SelectExpression)base.VisitExtension(extensionExpression);
// if predicate is optimized to true, we can simply remove it
var newPredicate = newSelectExpression.Predicate is SqlConstantExpression newSelectPredicateConstant &&
!(selectExpression.Predicate is SqlConstantExpression)
? (bool)newSelectPredicateConstant.Value
? null
: SqlExpressionFactory.Equal(
newSelectPredicateConstant,
SqlExpressionFactory.Constant(true, newSelectPredicateConstant.TypeMapping))
: newSelectExpression.Predicate;
var newHaving = newSelectExpression.Having is SqlConstantExpression newSelectHavingConstant &&
!(selectExpression.Having is SqlConstantExpression)
? (bool)newSelectHavingConstant.Value
? null
: SqlExpressionFactory.Equal(
newSelectHavingConstant,
SqlExpressionFactory.Constant(true, newSelectHavingConstant.TypeMapping))
: newSelectExpression.Having;
return(!ReferenceEquals(newPredicate, newSelectExpression.Predicate) ||
!ReferenceEquals(newHaving, newSelectExpression.Having)
? newSelectExpression.Update(
newSelectExpression.Projection.ToList(),
newSelectExpression.Tables.ToList(),
newPredicate,
newSelectExpression.GroupBy.ToList(),
newHaving,
newSelectExpression.Orderings.ToList(),
newSelectExpression.Limit,
newSelectExpression.Offset,
newSelectExpression.IsDistinct,
newSelectExpression.Alias)
: newSelectExpression);
}
return(base.VisitExtension(extensionExpression));
}
protected override Expression VisitSqlUnaryExpression(SqlUnaryExpression sqlUnaryExpression)
{
var result = base.VisitSqlUnaryExpression(sqlUnaryExpression);
if (result is SqlUnaryExpression newUnaryExpression &&
newUnaryExpression.Operand is SqlParameterExpression parameterOperand)
{
var parameterValue = _parametersValues[parameterOperand.Name];
if (sqlUnaryExpression.OperatorType == ExpressionType.Equal)
{
return(SqlExpressionFactory.Constant(parameterValue == null, sqlUnaryExpression.TypeMapping));
}
if (sqlUnaryExpression.OperatorType == ExpressionType.NotEqual)
{
return(SqlExpressionFactory.Constant(parameterValue != null, sqlUnaryExpression.TypeMapping));
}
}
return(result);
}
