public override void Visit(SqlBinary node)
{
switch (node.NodeType)
{
// Bit XOR is not supported by SQLite
// but it can be easily emulated using remaining bit operators
case SqlNodeType.BitXor:
// A ^ B = (A | B) & ~(A & B)
var replacement = SqlDml.BitAnd(
SqlDml.BitOr(node.Left, node.Right),
SqlDml.BitNot(SqlDml.BitAnd(node.Left, node.Right)));
replacement.AcceptVisitor(this);
return;
case SqlNodeType.DateTimePlusInterval:
DateTimeAddInterval(node.Left, node.Right).AcceptVisitor(this);
return;
case SqlNodeType.DateTimeMinusInterval:
DateTimeAddInterval(node.Left, -node.Right).AcceptVisitor(this);
return;
case SqlNodeType.DateTimeMinusDateTime:
case SqlNodeType.DateTimeOffsetMinusDateTimeOffset:
DateTimeSubtractDateTime(node.Left, node.Right).AcceptVisitor(this);
return;
case SqlNodeType.DateTimeOffsetPlusInterval:
SqlDml.Concat(
DateTimeAddInterval(DateTimeOffsetExtractDateTimeAsString(node.Left), node.Right),
DateTimeOffsetExtractOffsetAsString(node.Left))
.AcceptVisitor(this);
return;
case SqlNodeType.DateTimeOffsetMinusInterval:
SqlDml.Concat(
DateTimeAddInterval(DateTimeOffsetExtractDateTimeAsString(node.Left), -node.Right),
DateTimeOffsetExtractOffsetAsString(node.Left))
.AcceptVisitor(this);
return;
default:
base.Visit(node);
return;
}
}
protected override SqlExpression VisitUnary(UnaryExpression expression)
{
var operand = Visit(expression.Operand);
if (expression.Method != null)
{
return(CompileMember(expression.Method, null, operand));
}
switch (expression.NodeType)
{
case ExpressionType.ArrayLength:
if (expression.Operand.Type != typeof(byte[]))
{
throw new NotSupportedException(string.Format(Strings.ExTypeXIsNotSupported, expression.Operand.Type));
}
return(SqlDml.Cast(SqlDml.BinaryLength(operand), driver.MapValueType(typeof(int))));
case ExpressionType.Negate:
case ExpressionType.NegateChecked:
return(SqlDml.Negate(operand));
case ExpressionType.UnaryPlus:
return(operand);
case ExpressionType.Not:
return(IsBooleanExpression(expression.Operand)
? SqlDml.Not(operand)
: SqlDml.BitNot(operand));
case ExpressionType.Convert:
case ExpressionType.ConvertChecked:
return(VisitCast(expression, operand));
}
return(operand);
}
