[R-sig-DB] SQLite and S4 classes with 6D arrays

[Iago Mosqueira]

Hi,

I am exploring the possibility of using SQLite for storing out of memory
S4 objects composed of a number of slots, each having a 6D array. I am 
    looking at mimicking the functionality offered by SQLiteDF, but in 
this      case there is no need for such flexibility, as each 6D array 
will fit     into a fixed DB structure. Columns will be of a given 
class/data type an     name. Also, I need to overload a larger number of 
methods, and do not     intend to transform my objects to data.frames in 
the R workspace, so     direct use of SQLiteDF does not seem the best 
option, although I will be      very likely seeking inspiration on such 
a neat package.

I intend to deal with large objects, so I am trying to pass the objects 
      directly from R to SQLite avoiding copies. So far I seem to have 
been     able to do so using sqlite3_bind and SEXP pointers.

For this type of concrete use, I would like to know what do you think I 
should consider using from DBI, or if I better off dealing directly with 
      SQLite. I might consider in the future a similar package for 
interaction      with MySQL, but I fear the kind of efficient connection 
I am after will      mean I might not get much use from structuring my 
package around DBI.     Also, any other suggestion or pointer for this 
kind of specific   application will be most welcome.

Many thanks.


Iago