將 databaze 初始化為全局變量是個(gè)好主意嗎？它可以工作嗎？我在想這樣的事情：func MustDB(d *sql.DB, err error) *sql.DB {   if err != nil {     log.Panic(err)   }   return d}// what I don't know - is how to call db.Close()// username and password can also be read similar wayvar db *DB = MustDB(db.Open(...))func MustPrepare(db *sql.DB, query string) *sql.Stmt {  res, err := sql.Prepare(db, query)  if err!=nil {    log.Panic(err)  }  return ret;}優(yōu)點(diǎn)是，我可以簡(jiǎn)單地將準(zhǔn)備好的 sql 語(yǔ)句創(chuàng)建為全局變量。我不必創(chuàng)建和管理存儲(chǔ)，所有 sql 命令都將放在那里。只有我寫：var s1 *sql.Stmt = MustPrepare(db, "SELECT * FROM MyTable")var s2 *sql.Stmt = MustPrepare(db, "INSERT INTO MyTable(col1, col2) VALUES(?,?)")var s3 *sql.Stmt = MustPrepare(db, "DELETE FROM MyTable WHERE col1=?")你認(rèn)為，這種模式有用，還是根本行不通。