Cela pourrait être étroitement approximé en utilisant sprintf
sql_string <- "UPDATE list_m SET db_name = %s, db_weight = %s, processing_status = 'MATCHED' WHERE request_id=111 AND db_c_id = '%s';"
dbSendStatement(con, paste(sprintf(sql_string, matches$name, matches$weight, matches$c_id), collapse=""))