On Fri, 02 Jan 2015, Lewis Balentine wrote: > I also note from an example in the "obsolete" Gambas Wiki that an > explanation mark "!" is used to delimit field names in a result. > http://gambasdoc.org/help/comp/gb.db/connection/edit?v3 > > I do not find any similar example in the current Gambas Wiki but perhaps > I missed it. >
And about this: the ! operator is an array accessor. You know that Gambas classes can implement the array operator [], so that e.g. myObject["stringkey"] = vValue ' or myObject[fFloatKey] = vValue ' or any other datatype as index! can be written where myObject is an object of myClass which I wrote by myself in Gambas. The special methods[0] _get() and _put() do that. Now, the ! operator is a special case applicable to string keys. object!key is defined to be object["key"] where the key behind the ! is put as-is inside quotation marks and used as a key. So you would use it if you already know the (fixed) key, as for databases: rResult["surname"] ' can also be rResult!surname but cCollection[sArgument] ' can NOT be, obviously, cCollection!sArgument In any case, it is important to know that ! is a special case of []. Sometimes you have fixed keys which contain parts that have special meaning in Gambas, like in the Graphviz project in the software farm (yes, I'm trying to increase its number of downloads :-)). There is a line Graphviz.VertexStyle["/"].Color = "red" which obviously cannot be written as Graphviz.VertexStyle!/.Color = "red" so we have to fall back to the [] notation, but a line like Graphviz.VertexStyle["test"].Color = "red" could become Graphviz.VertexStyle!test.Color = "red" Alas, I can't quote the wiki here because I haven't found any explicit mention of !. I know through experimentation that it works this way (but perhaps, I missed it, too). Regards, Tobi [0] http://gambaswiki.org/wiki/cat/special -- "There's an old saying: Don't change anything... ever!" -- Mr. Monk ------------------------------------------------------------------------------ Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net _______________________________________________ Gambas-user mailing list Gambas-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/gambas-user
