Add support for "NOT" operator in Where expressions (robertohuertasm#70)

Author: javilumbrales

Example/Assets/Scripts/SQLite.cs

@@ -2740,6 +2740,15 @@ private CompileResult CompileExpr (Expression expr, List<object> queryArgs)
 					CommandText = valr.CommandText,
 					Value = valr.Value != null ? ConvertTo (valr.Value, ty) : null
 				};
+			} else if (expr.NodeType == ExpressionType.Not) {
+				var u = (UnaryExpression)expr;
+				var ty = u.Type;
+				var valr = CompileExpr (u.Operand, queryArgs);
+
+				return new CompileResult {
+					CommandText = "NOT " + valr.CommandText,
+					Value = valr.Value != null ? valr.Value : null
+				};
 			} else if (expr.NodeType == ExpressionType.MemberAccess) {
 				var mem = (MemberExpression)expr;