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#' @name Query functions
#' @rdname query_funcs
#' @title Wrappers for sending queries and fetching results
#'
#' @description
#' These functions send a query to the given database, and are the access point
#' for all tcpl functions that query or update the tcpl database.
#'
#' @param query Character of length 1, the query string
#' @inheritParams tcplConf
#'
#' @details
#' Currently, the tcpl package only supports the "MySQL" and "tcplLite" database
#' drivers.
#'
#' \code{tcplQuery} returns a data.table object with the query results.
#' \code{tcplSendQuery} sends a query, but does not fetch any results, and
#' returns 'TRUE' or the error message given by the database.
#'
#' @examples
#'
#' ## Store the current config settings, so they can be reloaded at the end
#' ## of the examples
#' conf_store <- tcplConfList()
#' TCPLlite <- file.path(system.file(package = "tcpl"), "example")
#' tcplConf(db = TCPLlite, user = NA, host = NA, drvr = "tcplLite")
#'
#' tcplQuery("SELECT 'Hello World';")
#'
#' ## When using tcplLite, name of table must be passed into tcplQuery
#' if (conf_store$TCPL_DRVR == 'MySQL') {
#' tcplQuery("SELECT * FROM assay;")
#' } else {
#' tcplQuery("SELECT * FROM assay;", tbl='assay')
#' }
#'
#' ## Reset configuration
#' options(conf_store)
#'
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