# S4 method for PqConnection,Id
dbQuoteIdentifier(conn, x, ...)# S4 method for PqConnection,SQL
dbQuoteIdentifier(conn, x, ...)
# S4 method for PqConnection,character
dbQuoteIdentifier(conn, x, ...)
# S4 method for PqConnection
dbQuoteLiteral(conn, x, ...)
# S4 method for PqConnection,SQL
dbQuoteString(conn, x, ...)
# S4 method for PqConnection,character
dbQuoteString(conn, x, ...)
# S4 method for PqConnection,SQL
dbUnquoteIdentifier(conn, x, ...)