Question

I have a vector of values in R and want to get responding values from a sqlite database. I use the following code.

values = c()

for (a in keys)
{
    result <- dbGetQuery(con," SELECT content FROM aacontent WHERE Id=?",a)
    values = c(values,results)
}

Unfortunatly, this code is very slow. Is there a more efficent way to do this?

Thanks,

Johannes

Answer 1

If aacontent isn’t very large then read it all into R and use something like R’s match function, or the sqldf function, or data.table functions

If aacontent is too large for that, and keys is small-ish, then write keys to an sqlite table and do a join query. You might benefit from creating an index on one or both of them.