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#' @include MariaDBConnection.R
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#' DBMS Transaction Management
#'
#' Commits or roll backs the current transaction in an MariaDB connection.
#' Note that in MariaDB DDL statements (e.g. `CREATE TABLE`) cannot
#' be rolled back.
#'
#' @param conn a [MariaDBConnection-class] object, as produced by
#' [DBI::dbConnect()].
#' @param ... Unused.
#' @examples
#' if (mariadbHasDefault()) {
#' con <- dbConnect(RMariaDB::MariaDB(), dbname = "test")
#' df <- data.frame(id = 1:5)
#'
#' dbWriteTable(con, "df", df, temporary = TRUE)
#' dbBegin(con)
#' dbExecute(con, "UPDATE df SET id = id * 10")
#' dbGetQuery(con, "SELECT id FROM df")
#' dbRollback(con)
#'
#' dbGetQuery(con, "SELECT id FROM df")
#'
#' dbDisconnect(con)
#' }
#' @name transactions
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