io.dna.db: Read and Write DNA Sequences from/to PgSQL Database
In megaptera: MEGAPhylogeny Techniques in R

DNA sequence alignment can be read from and written to a (alreay existing) pgSQL database table.

dbReadDNA(conn, tab.name, taxon, regex = FALSE, max.bp,
          max.dist, enforce.binomial = FALSE, ignore.excluded =
          TRUE)

dbWriteDNA(conn, tab.name, seqs, enforce.binomial = TRUE,
  status)

`conn`	a connection object as produced by `dbConnect`.
`tab.name`	a character string giving the name of the database table (gene).
`taxon`	a character string giving the name of the taxon.
`regex`	logical: if `TRUE`, the string given via `taxon` will be interpreted as a regular expression (see `regex`).
`seqs`	an object of class `DNAbin` to write to the database.
`enforce.binomial`	Logical.
`max.bp`	an integer, only sequences shorter equal or shorter than `max.bp` will be returned.
`max.dist`	an integer, only sequences equally or less distant to the benchmark than `max.dist` will be returned.
`status`	a character string to be written to the status field of the PgSQG table.
`ignore.excluded`	logical: if `TRUE`, `dbReadDNA` will return also sequences that are marked in the status field as 'excluded', 'too long', or 'too distant'.