[R-sig-DB] New generic for prepared queries

[Hadley Wickham]

While we're on the subject of new generics, I think we also need a
generic for prepared queries. SQLite has

setGeneric("dbSendPreparedQuery", function(conn, statement, bind.data, ...) {
    standardGeneric("dbSendPreparedQuery")
}, valueClass = "DBIResult"))

Does that seem a reasonable API?  How the prepared query works would
vary from backend to backend, depending on what the underlying
database supports.

(I guess we'd also need a matching dbGetPreparedQuery and
dbExecutePreparedQuery)

Hadley


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