R/dbQuoteLiteral_DBIConnection.R

In DBI: R Database Interface

#' @rdname hidden_aliases
#' @usage NULL
dbQuoteLiteral_DBIConnection <- function(conn, x, ...) {
  # Switchpatching to avoid ambiguous S4 dispatch, so that our method
  # is used only if no alternatives are available.

  if (is(x, "SQL")) {
    return(x)
  }

  if (is.factor(x)) {
    return(dbQuoteString(conn, as.character(x)))
  }

  if (is.character(x)) {
    return(dbQuoteString(conn, x))
  }

  if (inherits(x, "POSIXt")) {
    return(dbQuoteString(
      conn,
      strftime(as.POSIXct(x), "%Y-%m-%d %H-%M-%S%z")
    ))
  }

  if (inherits(x, "Date")) {
    return(dbQuoteString(conn, as.character(x)))
  }

  if (inherits(x, "difftime")) {
    return(dbQuoteString(conn, format_hms(x)))
  }

  if (is.list(x)) {
    blob_data <- vapply(
      x,
      function(x) {
        if (is.null(x)) {
          "NULL"
        } else if (is.raw(x)) {
          paste0("X'", paste(format(x), collapse = ""), "'")
        } else {
          stop("Lists must contain raw vectors or NULL", call. = FALSE)
        }
      },
      character(1)
    )
    return(SQL(blob_data, names = names(x)))
  }

  if (is.logical(x)) {
    x <- as.numeric(x)
  }

  x <- as.character(x)
  x[is.na(x)] <- "NULL"
  SQL(x, names = names(x))
}
#' @rdname hidden_aliases
#' @export
setMethod("dbQuoteLiteral", signature("DBIConnection"), dbQuoteLiteral_DBIConnection)