{"id":1524,"date":"2026-04-11T02:15:11","date_gmt":"2026-04-10T18:15:11","guid":{"rendered":"https:\/\/mayaharper.showcasingme.net\/vn\/quick-start-guide-uml-object-diagrams\/"},"modified":"2026-04-11T02:15:11","modified_gmt":"2026-04-10T18:15:11","slug":"quick-start-guide-uml-object-diagrams","status":"publish","type":"post","link":"https:\/\/mayaharper.showcasingme.net\/vn\/quick-start-guide-uml-object-diagrams\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn nhanh cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u v\u1ec1 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML"},"content":{"rendered":"

Hi\u1ec3u \u0111\u01b0\u1ee3c ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m c\u1ee7a b\u1ea1n \u0111\u00f2i h\u1ecfi nhi\u1ec1u h\u01a1n ch\u1ec9 vi\u1ec7c vi\u1ebft m\u00e3. N\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 tr\u1ef1c quan h\u00f3a. Trong khi s\u01a1 \u0111\u1ed3 l\u1edbp th\u1ec3 hi\u1ec7n b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf c\u1ee7a h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n,S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML<\/strong>ghi l\u1ea1i tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u00f3 t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m nh\u1ea5t \u0111\u1ecbnh. \u0110\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n b\u01b0\u1edbc v\u00e0o thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m ph\u1ee9c t\u1ea1p, vi\u1ec7c n\u1eafm b\u1eaft c\u00e1ch c\u00e1c th\u1ec3 hi\u1ec7n t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau l\u00e0 \u0111i\u1ec1u then ch\u1ed1t cho vi\u1ec7c g\u1ee1 l\u1ed7i, t\u00e0i li\u1ec7u h\u00f3a v\u00e0 giao ti\u1ebfp.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y cung c\u1ea5p c\u00e1i nh\u00ecn s\u00e2u s\u1eafc v\u1ec1 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng. Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 c\u1ea5u tr\u00fac, c\u00fa ph\u00e1p v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf c\u1ee7a ch\u00fang m\u00e0 kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o c\u00f4ng c\u1ee5 c\u1ee5 th\u1ec3 hay nh\u1eefng l\u1eddi qu\u1ea3ng c\u00e1o g\u00e2y \u1ea5n t\u01b0\u1ee3ng. Sau khi \u0111\u1ecdc xong, b\u1ea1n s\u1ebd hi\u1ec3u c\u00e1ch x\u00e2y d\u1ef1ng c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u1ec3 l\u00e0m r\u00f5 h\u00e0nh vi t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y ch\u01b0\u01a1ng tr\u00ecnh.<\/p>\n

\"Chalkboard-style<\/figure>\n

\ud83e\udde9 S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML l\u00e0 g\u00ec?<\/h2>\n

S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac t\u0129nh. N\u00f3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p nhanh c\u1ee7a h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. Kh\u00e1c v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp, v\u1ed1n \u0111\u1ecbnh ngh\u0129a c\u1ea5u tr\u00fac ti\u1ec1m n\u0103ng (lo\u1ea1i, thu\u1ed9c t\u00ednh, thao t\u00e1c), s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c \u0111i\u1ec1n v\u00e0o trong c\u00e1c c\u1ea5u tr\u00fac \u0111\u00f3.<\/p>\n

H\u00e3y h\u00ecnh dung s\u01a1 \u0111\u1ed3 l\u1edbp nh\u01b0 m\u1ed9t c\u00f4ng th\u1ee9c l\u00e0m b\u00e1nh. N\u00f3 li\u1ec7t k\u00ea c\u00e1c nguy\u00ean li\u1ec7u v\u00e0 c\u00e1c b\u01b0\u1edbc th\u1ef1c hi\u1ec7n. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 chi\u1ebfc b\u00e1nh th\u1ef1c s\u1ef1 \u0111ang n\u1eb1m tr\u00ean b\u00e0n. N\u00f3 th\u1ec3 hi\u1ec7n k\u1ebft qu\u1ea3 c\u1ee7a vi\u1ec7c th\u1ef1c hi\u1ec7n c\u00f4ng th\u1ee9c. V\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt, n\u00f3 hi\u1ec3n th\u1ecb:<\/p>\n

    \n
  • \u0110\u1ed1i t\u01b0\u1ee3ng:<\/strong>C\u00e1c th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp.<\/li>\n
  • Li\u00ean k\u1ebft:<\/strong>C\u00e1c k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n
  • Thu\u1ed9c t\u00ednh:<\/strong>Gi\u00e1 tr\u1ecb hi\u1ec7n t\u1ea1i m\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang gi\u1eef.<\/li>\n
  • Tr\u1ea1ng th\u00e1i:<\/strong>Tr\u1ea1ng th\u00e1i c\u1ee7a h\u1ec7 th\u1ed1ng t\u1ea1i th\u1eddi \u0111i\u1ec3m \u0111\u00f3.<\/li>\n<\/ul>\n

    Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u1eb7c bi\u1ec7t h\u1eefu \u00edch khi b\u1ea1n c\u1ea7n gi\u1ea3i th\u00edch c\u00e1c t\u01b0\u01a1ng t\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ee9c t\u1ea1p cho c\u00e1c b\u00ean li\u00ean quan c\u00f3 th\u1ec3 kh\u00f4ng hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1c c\u1ea5u tr\u00fac l\u1edbp tr\u1eebu t\u01b0\u1ee3ng. Ch\u00fang gi\u00fap cu\u1ed9c tr\u00f2 chuy\u1ec7n d\u1ef1a tr\u00ean c\u00e1c v\u00ed d\u1ee5 c\u1ee5 th\u1ec3.<\/p>\n

    \ud83d\udd11 C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh v\u00e0 k\u00fd hi\u1ec7u<\/h2>\n

    Tr\u01b0\u1edbc khi v\u1ebd, b\u1ea1n ph\u1ea3i hi\u1ec3u ng\u00f4n ng\u1eef tr\u1ef1c quan. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng s\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u c\u1ee5 th\u1ec3 \u0111\u1ec3 truy\u1ec1n \u0111\u1ea1t \u00fd ngh\u0129a m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ph\u00e2n t\u00edch c\u00e1c th\u00e0nh ph\u1ea7n thi\u1ebft y\u1ebfu.<\/p>\n\n\n\n\n\n\n\n\n\n\n
    Th\u00e0nh ph\u1ea7n<\/th>\nBi\u1ec3u di\u1ec5n tr\u1ef1c quan<\/th>\nM\u1ee5c \u0111\u00edch<\/th>\n<\/tr>\n<\/thead>\n
    \u0110\u1ed1i t\u01b0\u1ee3ng<\/strong><\/td>\nH\u00ecnh ch\u1eef nh\u1eadt c\u00f3 g\u1ea1ch ch\u00e2n \u0111\u1eadm<\/td>\n\u0110\u1ea1i di\u1ec7n cho m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 c\u1ee7a m\u1ed9t l\u1edbp.<\/td>\n<\/tr>\n
    T\u00ean l\u1edbp<\/strong><\/td>\nPh\u1ea7n tr\u00ean c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt<\/td>\nX\u00e1c \u0111\u1ecbnh lo\u1ea1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng.<\/td>\n<\/tr>\n
    T\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng<\/strong><\/td>\nPh\u1ea7n d\u01b0\u1edbi c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt (c\u00f3 g\u1ea1ch ch\u00e2n)<\/td>\nCh\u1ec9 s\u1ed1 \u0111\u1ecbnh danh duy nh\u1ea5t cho th\u1ec3 hi\u1ec7n.<\/td>\n<\/tr>\n
    Thu\u1ed9c t\u00ednh<\/strong><\/td>\nDanh s\u00e1ch b\u00ean trong h\u00ecnh ch\u1eef nh\u1eadt<\/td>\nHi\u1ec3n th\u1ecb c\u00e1c gi\u00e1 tr\u1ecb d\u1eef li\u1ec7u hi\u1ec7n t\u1ea1i.<\/td>\n<\/tr>\n
    Li\u00ean k\u1ebft<\/strong><\/td>\n\u0110\u01b0\u1eddng n\u1ed1i c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\nBi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ec3 hi\u1ec7n.<\/td>\n<\/tr>\n
    S\u1ed1 l\u01b0\u1ee3ng<\/strong><\/td>\nC\u00e1c con s\u1ed1 \u1edf g\u1ea7n hai \u0111\u1ea7u c\u1ee7a \u0111\u01b0\u1eddng n\u1ed1i<\/td>\nCh\u1ec9 ra s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    1. H\u1ed9p \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

    M\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c v\u1ebd d\u01b0\u1edbi d\u1ea1ng h\u00ecnh ch\u1eef nh\u1eadt. Ph\u1ea7n tr\u00ean ch\u1ee9a t\u00ean l\u1edbp (v\u00ed d\u1ee5 nh\u01b0 Kh\u00e1ch h\u00e0ng<\/code>). Ph\u1ea7n d\u01b0\u1edbi ch\u1ee9a t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng, \u0111\u01b0\u1ee3c ti\u1ec1n t\u1ed1 b\u1eb1ng d\u1ea5u hai ch\u1ea5m. V\u00ed d\u1ee5, :Kh\u00e1ch h\u00e0ng<\/code> ho\u1eb7c john_doe:Kh\u00e1ch h\u00e0ng<\/code>. T\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ea1ch ch\u00e2n \u0111\u1ec3 ph\u00e2n bi\u1ec7t v\u1edbi t\u00ean l\u1edbp.<\/p>\n

    B\u00ean trong h\u1ed9p, b\u1ea1n li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh. Trong s\u01a1 \u0111\u1ed3 l\u1edbp, c\u00e1c thu\u1ed9c t\u00ednh m\u00f4 t\u1ea3 ki\u1ec3u d\u1eef li\u1ec7u (v\u00ed d\u1ee5 nh\u01b0 tu\u1ed5i: int<\/code>). Trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, b\u1ea1n hi\u1ec3n th\u1ecb c\u00e1c gi\u00e1 tr\u1ecb th\u1ef1c t\u1ebf (v\u00ed d\u1ee5 nh\u01b0 tu\u1ed5i: 28<\/code>). S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u d\u1eef li\u1ec7u t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y.<\/p>\n

    2. Li\u00ean k\u1ebft v\u00e0 li\u00ean k\u1ebft<\/h3>\n

    C\u00e1c li\u00ean k\u1ebft bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. Ch\u00fang \u0111\u01b0\u1ee3c v\u1ebd b\u1eb1ng c\u00e1c \u0111\u01b0\u1eddng li\u1ec1n n\u1ed1i c\u00e1c h\u1ed9p. Kh\u00e1c v\u1edbi c\u00e1c li\u00ean k\u1ebft l\u1edbp \u0111\u1ecbnh ngh\u0129a c\u00e1c k\u1ebft n\u1ed1i ti\u1ec1m n\u0103ng, c\u00e1c li\u00ean k\u1ebft \u0111\u1ecbnh ngh\u0129a c\u00e1c k\u1ebft n\u1ed1i th\u1ef1c t\u1ebf.<\/p>\n

      \n
    • T\u00ean li\u00ean k\u1ebft:<\/strong>Nh\u00e3n tr\u00ean \u0111\u01b0\u1eddng n\u1ed1i m\u00f4 t\u1ea3 m\u1ed1i quan h\u1ec7 (v\u00ed d\u1ee5 nh\u01b0 s\u1edf h\u1eefu<\/code>, qu\u1ea3n l\u00fd<\/code>).<\/li>\n
    • T\u00ean vai tr\u00f2:<\/strong>Nh\u00e3n \u1edf hai \u0111\u1ea7u \u0111\u01b0\u1eddng n\u1ed1i cho th\u1ea5y quan \u0111i\u1ec3m c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n<\/ul>\n

      \ud83c\udd9a S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng so v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp<\/h2>\n

      S\u1ef1 nh\u1ea7m l\u1eabn th\u01b0\u1eddng x\u1ea3y ra gi\u1eefa hai lo\u1ea1i s\u01a1 \u0111\u1ed3 n\u00e0y. C\u1ea3 hai \u0111\u1ec1u mang t\u00ednh c\u1ea5u tr\u00fac, nh\u01b0ng tr\u1ecdng t\u00e2m c\u1ee7a ch\u00fang kh\u00e1c bi\u1ec7t r\u00f5 r\u1ec7t. Hi\u1ec3u \u0111\u01b0\u1ee3c khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng lo\u1ea1i n\u00e0o l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 vi\u1ebft t\u00e0i li\u1ec7u k\u1ef9 thu\u1eadt v\u00e0 ki\u1ebfn tr\u00fac s\u01b0.<\/p>\n\n\n\n\n\n\n\n\n\n
      T\u00ednh n\u0103ng<\/th>\nS\u01a1 \u0111\u1ed3 l\u1edbp<\/th>\nS\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng<\/th>\n<\/tr>\n<\/thead>\n
      Tr\u1ecdng t\u00e2m<\/strong><\/td>\nLo\u1ea1i v\u00e0 \u0111\u1ecbnh ngh\u0129a<\/td>\nTh\u1ec3 hi\u1ec7n v\u00e0 d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
      Th\u1eddi gian s\u1ed1ng<\/strong><\/td>\nT\u0129nh (b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf)<\/td>\n\u0110\u1ed9ng (b\u1ee9c \u1ea3nh ch\u1ee5p)<\/td>\n<\/tr>\n
      Thu\u1ed9c t\u00ednh<\/strong><\/td>\nLo\u1ea1i d\u1eef li\u1ec7u<\/td>\nGi\u00e1 tr\u1ecb th\u1ef1c t\u1ebf<\/td>\n<\/tr>\n
      S\u1eed d\u1ee5ng<\/strong><\/td>\nGiai \u0111o\u1ea1n thi\u1ebft k\u1ebf<\/td>\nG\u1ee1 l\u1ed7i & T\u00e0i li\u1ec7u<\/td>\n<\/tr>\n
      \u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/strong><\/td>\nC\u00f3 th\u1ec3 l\u1edbn v\u00e0 tr\u1eebu t\u01b0\u1ee3ng<\/td>\nTh\u01b0\u1eddng nh\u1ecf h\u01a1n v\u00e0 c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Trong khi s\u01a1 \u0111\u1ed3 l\u1edbp tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi ‘H\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 l\u00e0m g\u00ec?’, th\u00ec s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng tr\u1ea3 l\u1eddi c\u00e2u h\u1ecfi ‘H\u1ec7 th\u1ed1ng \u0111ang l\u00e0m g\u00ec ngay l\u00fac n\u00e0y?’. Vi\u1ec7c s\u1eed d\u1ee5ng c\u1ea3 hai s\u01a1 \u0111\u1ed3 c\u00f9ng nhau s\u1ebd cung c\u1ea5p c\u00e1i nh\u00ecn to\u00e0n di\u1ec7n v\u1ec1 thi\u1ebft k\u1ebf v\u00e0 h\u00e0nh vi ph\u1ea7n m\u1ec1m c\u1ee7a b\u1ea1n.<\/p>\n

      \ud83d\udee0\ufe0f C\u00e1ch t\u1ea1o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng<\/h2>\n

      Vi\u1ec7c t\u1ea1o c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u00f2i h\u1ecfi m\u1ed9t lu\u1ed3ng logic. B\u1ea1n kh\u00f4ng th\u1ec3 v\u1ebd c\u00e1c h\u1ed9p m\u1ed9t c\u00e1ch ng\u1eabu nhi\u00ean; ch\u00fang ph\u1ea3i ph\u1ea3n \u00e1nh c\u00e1c m\u1ed1i quan h\u1ec7 h\u1ee3p l\u1ec7 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong c\u1ea5u tr\u00fac l\u1edbp c\u1ee7a b\u1ea1n. H\u00e3y tu\u00e2n theo quy tr\u00ecnh n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 ch\u00ednh x\u00e1c.<\/p>\n

      B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh ph\u1ea1m vi<\/h3>\n

      B\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1ch x\u00e1c \u0111\u1ecbnh t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3 m\u00e0 b\u1ea1n \u0111ang m\u00f4 h\u00ecnh h\u00f3a. B\u1ea1n \u0111ang t\u00e0i li\u1ec7u h\u00f3a tr\u00ecnh t\u1ef1 \u0111\u0103ng nh\u1eadp? Hi\u1ec3n th\u1ecb m\u1ed9t giao d\u1ecbch c\u01a1 s\u1edf d\u1eef li\u1ec7u? Hay minh h\u1ecda m\u1ed9t tr\u1ea1ng th\u00e1i l\u1ed7i c\u1ee5 th\u1ec3? H\u1ea1n ch\u1ebf ph\u1ea1m vi s\u1ebd ng\u0103n s\u01a1 \u0111\u1ed3 tr\u1edf n\u00ean r\u1ed1i r\u1eafm.<\/p>\n

      B\u01b0\u1edbc 2: X\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

      H\u00e3y xem s\u01a1 \u0111\u1ed3 l\u1edbp c\u1ee7a b\u1ea1n v\u00e0 ch\u1ecdn c\u00e1c l\u1edbp li\u00ean quan \u0111\u1ebfn t\u00ecnh hu\u1ed1ng c\u1ee7a b\u1ea1n. T\u1ea1o c\u00e1c th\u1ec3 hi\u1ec7n cho m\u1ed7i l\u1edbp. \u0110\u1ea3m b\u1ea3o b\u1ea1n \u0111\u1eb7t t\u00ean cho ch\u00fang r\u00f5 r\u00e0ng. Tr\u00e1nh d\u00f9ng c\u00e1c t\u00ean chung chung nh\u01b0 “obj1<\/code> tr\u1eeb khi \u0111\u00f3 l\u00e0 m\u1ed9t bi\u1ebfn t\u1ea1m th\u1eddi. S\u1eed d\u1ee5ng t\u00ean m\u00f4 t\u1ea3 nh\u01b0 user_session_01<\/code>.<\/p>\n

      B\u01b0\u1edbc 3: G\u00e1n gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh<\/h3>\n

      \u0110i\u1ec1n c\u00e1c ph\u1ea7n thu\u1ed9c t\u00ednh b\u1eb1ng d\u1eef li\u1ec7u th\u1ef1c t\u1ebf. N\u1ebfu b\u1ea1n \u0111ang m\u00f4 h\u00ecnh h\u00f3a gi\u1ecf h\u00e0ng, thu\u1ed9c t\u00ednh gi\u00e1 ph\u1ea3i l\u00e0 m\u1ed9t s\u1ed1, ch\u1ee9 kh\u00f4ng ph\u1ea3i chu\u1ed7i nh\u01b0 \u201cprice\u201d. S\u1ef1 nh\u1ea5t qu\u00e1n v\u1ec1 ki\u1ec3u d\u1eef li\u1ec7u gi\u00fap duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a m\u00f4 h\u00ecnh.<\/p>\n

      B\u01b0\u1edbc 4: Thi\u1ebft l\u1eadp li\u00ean k\u1ebft<\/h3>\n

      K\u1ebft n\u1ed1i c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng b\u1eb1ng c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i ph\u1ea3n \u00e1nh c\u00e1c m\u1ed1i quan h\u1ec7 trong s\u01a1 \u0111\u1ed3 l\u1edbp c\u1ee7a b\u1ea1n. \u0110\u1ea3m b\u1ea3o h\u01b0\u1edbng \u0111i kh\u1edbp nhau. N\u1ebfu s\u01a1 \u0111\u1ed3 l\u1edbp hi\u1ec3n th\u1ecb m\u1ed1i quan h\u1ec7 m\u1ed9t-\u0111a, h\u00e3y \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3n \u00e1nh \u0111\u00fang s\u1ed1 l\u01b0\u1ee3ng li\u00ean k\u1ebft th\u1ef1c t\u1ebf c\u00f3 trong b\u1ea3n ch\u1ee5p n\u00e0y.<\/p>\n

      B\u01b0\u1edbc 5: Th\u00eam r\u00e0ng bu\u1ed9c b\u1ed9i s\u1ed1<\/h3>\n

      Bao g\u1ed3m c\u00e1c ch\u1ec9 b\u00e1o b\u1ed9i s\u1ed1 \u1edf hai \u0111\u1ea7u c\u1ee7a c\u00e1c li\u00ean k\u1ebft. \u0110i\u1ec1u n\u00e0y l\u00e0m r\u00f5 t\u00ednh b\u1ed9i s\u1ed1 c\u1ee7a m\u1ed1i quan h\u1ec7. C\u00e1c k\u00fd hi\u1ec7u ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n

        \n
      • 1:<\/strong>Ch\u00ednh x\u00e1c m\u1ed9t.<\/li>\n
      • 0..1:<\/strong>Kh\u00f4ng ho\u1eb7c m\u1ed9t.<\/li>\n
      • 1..*:<\/strong>M\u1ed9t ho\u1eb7c nhi\u1ec1u.<\/li>\n
      • 0..*:<\/strong>Kh\u00f4ng ho\u1eb7c nhi\u1ec1u.<\/li>\n<\/ul>\n

        Nh\u1eefng con s\u1ed1 n\u00e0y gi\u00fap ng\u01b0\u1eddi \u0111\u1ecdc hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1c r\u00e0ng bu\u1ed9c m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ecdc m\u00e3 ngu\u1ed3n.<\/p>\n

        \ud83d\udcdd Quy t\u1eafc c\u00fa ph\u00e1p v\u00e0 quy \u01b0\u1edbc<\/h2>\n

        \u0110\u1ec3 duy tr\u00ec ti\u00eau chu\u1ea9n chuy\u00ean nghi\u1ec7p, tu\u00e2n th\u1ee7 c\u00e1c quy \u01b0\u1edbc \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp. Vi\u1ec7c l\u1ec7ch kh\u1ecfi nh\u1eefng quy \u01b0\u1edbc n\u00e0y c\u00f3 th\u1ec3 g\u00e2y nh\u1ea7m l\u1eabn cho c\u00e1c th\u00e0nh vi\u00ean trong nh\u00f3m quen thu\u1ed9c v\u1edbi chu\u1ea9n m\u1ef1c.<\/p>\n

          \n
        • G\u1ea1ch ch\u00e2n:<\/strong>Lu\u00f4n g\u1ea1ch ch\u00e2n t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110\u00e2y l\u00e0 d\u1ea5u hi\u1ec7u th\u1ecb gi\u00e1c ch\u00ednh ph\u00e2n bi\u1ec7t m\u1ed9t th\u1ec3 hi\u1ec7n v\u1edbi m\u1ed9t l\u1edbp.<\/li>\n
        • \u0110\u1ed9 hi\u1ec3n th\u1ecb:<\/strong>B\u1ea1n c\u00f3 th\u1ec3 bao g\u1ed3m c\u00e1c k\u00fd hi\u1ec7u \u0111\u1ed9 hi\u1ec3n th\u1ecb (+, -, #, ~) tr\u01b0\u1edbc t\u00ean thu\u1ed9c t\u00ednh, nh\u01b0ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c b\u1ecf qua trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 ti\u1ebft ki\u1ec7m kh\u00f4ng gian, tr\u1eeb khi gi\u00e1 tr\u1ecb b\u1ea3n th\u00e2n l\u00e0 nh\u1ea1y c\u1ea3m.<\/li>\n
        • \u0110\u1ecbnh d\u1ea1ng:<\/strong>Gi\u1eef v\u0103n b\u1ea3n b\u00ean trong c\u00e1c h\u1ed9p d\u1ec5 \u0111\u1ecdc. Kh\u00f4ng \u0111\u1ec3 v\u0103n b\u1ea3n tr\u00e0n ra ngo\u00e0i bi\u00ean gi\u1edbi m\u00e0 kh\u00f4ng \u0111\u01b0\u1ee3c ng\u1eaft d\u00f2ng r\u00f5 r\u00e0ng.<\/li>\n
        • M\u00e0u s\u1eafc:<\/strong>M\u1eb7c d\u00f9 \u0111en tr\u1eafng l\u00e0 ti\u00eau chu\u1ea9n, vi\u1ec7c s\u1eed d\u1ee5ng m\u00e0u s\u1eafc \u0111\u1ec3 nh\u00f3m c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 d\u1ec5 \u0111\u1ecdc. Tuy nhi\u00ean, h\u00e3y \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 v\u1eabn d\u1ec5 \u0111\u1ecdc khi in \u1edf ch\u1ebf \u0111\u1ed9 x\u00e1m.<\/li>\n
        • Nh\u00e3n li\u00ean k\u1ebft<\/strong> \u0110\u1eb7t t\u00ean li\u00ean k\u1ebft g\u1ea7n gi\u1eefa \u0111\u01b0\u1eddng k\u1ebb. \u0110\u1eb7t t\u00ean vai tr\u00f2 g\u1ea7n h\u1ed9p \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n<\/ul>\n

          \ud83d\udeab Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h2>\n

          Ngay c\u1ea3 c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc l\u1ed7i khi m\u00f4 h\u00ecnh h\u00f3a. Nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng \u0111i\u1ec3m nguy hi\u1ec3m n\u00e0y s\u1ebd gi\u00fap b\u1ea1n t\u1ea1o ra c\u00e1c s\u01a1 \u0111\u1ed3 s\u1ea1ch s\u1ebd v\u00e0 ch\u00ednh x\u00e1c h\u01a1n.<\/p>\n

            \n
          • Tr\u1ed9n l\u1eabn k\u00fd hi\u1ec7u l\u1edbp v\u00e0 k\u00fd hi\u1ec7u \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong> Kh\u00f4ng \u0111\u01b0\u1ee3c tr\u1ed9n t\u00ean l\u1edbp v\u00e0 t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng trong c\u00f9ng m\u1ed9t h\u1ed9p. Gi\u1eef c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p r\u00f5 r\u00e0ng.<\/li>\n
          • B\u1ecf qua t\u00ednh \u0111a d\u1ea1ng:<\/strong>V\u1ebd m\u1ed9t li\u00ean k\u1ebft m\u00e0 kh\u00f4ng x\u00e1c \u0111\u1ecbnh t\u00ednh \u0111a d\u1ea1ng s\u1ebd g\u00e2y ra s\u1ef1 m\u01a1 h\u1ed3 v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng \u0111\u1ed1i t\u01b0\u1ee3ng tham gia.<\/li>\n
          • Qu\u00e1 t\u1ea3i:<\/strong>C\u1ed1 g\u1eafng hi\u1ec3n th\u1ecb t\u1eebng \u0111\u1ed1i t\u01b0\u1ee3ng ri\u00eang l\u1ebb trong h\u1ec7 th\u1ed1ng. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 nh\u1eefng b\u1ee9c \u1ea3nh ch\u1ee5p nhanh. Hi\u1ec3n th\u1ecb qu\u00e1 nhi\u1ec1u d\u1eef li\u1ec7u s\u1ebd t\u1ea1o ra nhi\u1ec5u.<\/li>\n
          • Lo\u1ea1i thu\u1ed9c t\u00ednh sai:<\/strong>Vi\u1ebft \u201cstatus: active\u201d khi ki\u1ec3u d\u1eef li\u1ec7u l\u00e0 m\u00e3 s\u1ed1 nguy\u00ean. H\u00e3y tu\u00e2n theo c\u00e1c ki\u1ec3u d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong l\u01b0\u1ee3c \u0111\u1ed3 c\u1ee7a b\u1ea1n.<\/li>\n
          • C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u00e1ch r\u1eddi:<\/strong> \u0110\u1ec3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng tr\u00f4i n\u1ed5i m\u00e0 kh\u00f4ng c\u00f3 li\u00ean k\u1ebft, tr\u1eeb khi ch\u00fang l\u00e0 c\u00e1c th\u1ef1c th\u1ec3 \u0111\u1ed9c l\u1eadp. C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u00e1ch bi\u1ec7t th\u01b0\u1eddng cho th\u1ea5y m\u1ed1i quan h\u1ec7 b\u1ecb thi\u1ebfu.<\/li>\n<\/ul>\n

            \ud83d\udd0d C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t \u0111\u1ec3 t\u0103ng t\u00ednh d\u1ec5 \u0111\u1ecdc<\/h2>\n

            M\u1ed9t s\u01a1 \u0111\u1ed3 l\u00e0 c\u00f4ng c\u1ee5 giao ti\u1ebfp. N\u1ebfu kh\u00f4ng ai c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c n\u00f3, th\u00ec n\u00f3 \u0111\u00e3 th\u1ea5t b\u1ea1i m\u1ee5c \u0111\u00edch. H\u00e3y tu\u00e2n theo c\u00e1c th\u1ef1c h\u00e0nh n\u00e0y \u0111\u1ec3 t\u0103ng t\u00ednh r\u00f5 r\u00e0ng.<\/p>\n

            1. S\u1eed d\u1ee5ng nh\u00e3n m\u00f4 t\u1ea3<\/h3>\n

            Tr\u00e1nh d\u00f9ng c\u00e1c ch\u1eef vi\u1ebft t\u1eaft kh\u00f4ng \u0111\u01b0\u1ee3c hi\u1ec3u ph\u1ed5 bi\u1ebfn. Thay v\u00ec cust<\/code>, h\u00e3y d\u00f9ng customer<\/code>. N\u1ebfu kh\u00f4ng gian b\u1ecb gi\u1edbi h\u1ea1n, h\u00e3y d\u00f9ng ch\u00fa th\u00edch, nh\u01b0ng t\u00ean chu\u1ea9n lu\u00f4n \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n.<\/p>\n

            2. Nh\u00f3m c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan<\/h3>\n

            Nh\u00f3m tr\u1ef1c quan c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng th\u01b0\u1eddng t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. S\u1eed d\u1ee5ng c\u00e1c h\u1ed9p v\u00f4 h\u00ecnh ho\u1eb7c kho\u1ea3ng c\u00e1ch \u0111\u1ec3 t\u1ea1o th\u00e0nh c\u1ee5m. \u0110i\u1ec1u n\u00e0y gi\u00fap gi\u1ea3m t\u1ea3i nh\u1eadn th\u1ee9c c\u1ea7n thi\u1ebft \u0111\u1ec3 theo d\u00f5i c\u00e1c m\u1ed1i quan h\u1ec7 tr\u00ean to\u00e0n b\u1ed9 b\u1ea3ng v\u1ebd.<\/p>\n

            3. Duy tr\u00ec t\u00ednh nh\u1ea5t qu\u00e1n<\/h3>\n

            \u0110\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c h\u1ed9p \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 k\u00edch th\u01b0\u1edbc t\u01b0\u01a1ng \u0111\u1ed1i gi\u1ed1ng nhau. C\u0103n ch\u1ec9nh v\u0103n b\u1ea3n m\u1ed9t c\u00e1ch nh\u1ea5t qu\u00e1n. \u0110\u1ecbnh d\u1ea1ng kh\u00f4ng nh\u1ea5t qu\u00e1n s\u1ebd l\u00e0m ph\u00e2n t\u00e2m ng\u01b0\u1eddi \u0111\u1ecdc v\u00e0 tr\u00f4ng thi\u1ebfu chuy\u00ean nghi\u1ec7p.<\/p>\n

            4. Gi\u1edbi h\u1ea1n \u0111\u1ed9 ph\u1ee9c t\u1ea1p<\/h3>\n

            N\u1ebfu m\u1ed9t s\u01a1 \u0111\u1ed3 tr\u1edf n\u00ean qu\u00e1 l\u1edbn, h\u00e3y chia n\u00f3 th\u00e0nh nhi\u1ec1u g\u00f3c nh\u00ecn. V\u00ed d\u1ee5, m\u1ed9t s\u01a1 \u0111\u1ed3 cho m\u00f4-\u0111un Ng\u01b0\u1eddi d\u00f9ng v\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 kh\u00e1c cho m\u00f4-\u0111un Thanh to\u00e1n. T\u1ed1t h\u01a1n l\u00e0 c\u00f3 hai s\u01a1 \u0111\u1ed3 r\u00f5 r\u00e0ng h\u01a1n l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 qu\u00e1 t\u1ea3i.<\/p>\n

            \ud83c\udf0d C\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng th\u1ef1c t\u1ebf<\/h2>\n

            Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y ph\u00f9 h\u1ee3p \u1edf \u0111\u00e2u trong v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n? Ch\u00fang l\u00e0 c\u00f4ng c\u1ee5 linh ho\u1ea1t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u1edf nhi\u1ec1u giai \u0111o\u1ea1n kh\u00e1c nhau.<\/p>\n

            1. G\u1ee1 l\u1ed7i l\u1ed7i th\u1eddi gian ch\u1ea1y<\/h3>\n

            Khi x\u1ea3y ra l\u1ed7i, b\u1ea1n c\u00f3 th\u1ec3 m\u00f4 h\u00ecnh h\u00f3a tr\u1ea1ng th\u00e1i c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng tham gia v\u00e0o l\u1ed7i. \u0110i\u1ec1u n\u00e0y gi\u00fap t\u00e1i hi\u1ec7n v\u1ea5n \u0111\u1ec1 v\u00e0 hi\u1ec3u t\u1ea1i sao m\u1ed9t li\u00ean k\u1ebft c\u1ee5 th\u1ec3 \u0111\u00e3 th\u1ea5t b\u1ea1i.<\/p>\n

            2. T\u00e0i li\u1ec7u API<\/h3>\n

            \u0110\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n b\u00ean ngo\u00e0i s\u1eed d\u1ee5ng API c\u1ee7a b\u1ea1n, s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 minh h\u1ecda c\u1ea5u tr\u00fac d\u1eef li\u1ec7u \u0111\u1ea7u v\u00e0o mong \u0111\u1ee3i. N\u00f3 cho th\u1ea5y c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng d\u1eef li\u1ec7u li\u00ean k\u1ebft v\u1edbi nhau trong m\u1ed9t ph\u1ea3n h\u1ed3i.<\/p>\n

            3. \u0110\u00e0o t\u1ea1o th\u00e0nh vi\u00ean m\u1edbi trong nh\u00f3m<\/h3>\n

            Vi\u1ec7c \u0111\u01b0a th\u00e0nh vi\u00ean m\u1edbi l\u00e0m quen v\u1edbi c\u00f4ng vi\u1ec7c tr\u1edf n\u00ean d\u1ec5 d\u00e0ng h\u01a1n khi c\u00f3 c\u00e1c v\u00ed d\u1ee5 c\u1ee5 th\u1ec3. S\u01a1 \u0111\u1ed3 l\u1edbp th\u1ec3 hi\u1ec7n l\u00fd thuy\u1ebft; s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n th\u1ef1c h\u00e0nh. Nh\u1eefng ng\u01b0\u1eddi m\u1edbi c\u00f3 th\u1ec3 th\u1ea5y c\u00e1ch d\u1eef li\u1ec7u ch\u1ea3y qua h\u1ec7 th\u1ed1ng.<\/p>\n

            4. Ki\u1ec3m to\u00e1n h\u1ec7 th\u1ed1ng<\/h3>\n

            Trong qu\u00e1 tr\u00ecnh xem x\u00e9t m\u00e3 ngu\u1ed3n ho\u1eb7c ki\u1ec3m to\u00e1n ki\u1ebfn tr\u00fac, s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng gi\u00fap x\u00e1c minh r\u1eb1ng vi\u1ec7c tri\u1ec3n khai ph\u00f9 h\u1ee3p v\u1edbi thi\u1ebft k\u1ebf. Ch\u00fang l\u00e0m n\u1ed5i b\u1eadt s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa ki\u1ebfn tr\u00fac d\u1ef1 \u0111\u1ecbnh v\u00e0 tr\u1ea1ng th\u00e1i th\u1ef1c t\u1ebf t\u1ea1i th\u1eddi \u0111i\u1ec3m ch\u1ea1y.<\/p>\n

            \ud83d\udd04 T\u00edch h\u1ee3p v\u1edbi c\u00e1c s\u01a1 \u0111\u1ed3 UML kh\u00e1c<\/h2>\n

            S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng t\u1ed3n t\u1ea1i m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp. Ch\u00fang b\u1ed5 sung cho c\u00e1c s\u01a1 \u0111\u1ed3 UML kh\u00e1c \u0111\u1ec3 t\u1ea1o th\u00e0nh m\u1ed9t b\u1ed9 t\u00e0i li\u1ec7u \u0111\u1ea7y \u0111\u1ee7.<\/p>\n

              \n
            • S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1:<\/strong>S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 th\u1ec3 hi\u1ec7n lu\u1ed3ng theo th\u1eddi gian. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n tr\u1ea1ng th\u00e1i t\u0129nh \u0111\u01b0\u1ee3c t\u1ea1o ra t\u1eeb lu\u1ed3ng \u0111\u00f3. Ch\u00fang ho\u1ea1t \u0111\u1ed9ng t\u1ed1t khi k\u1ebft h\u1ee3p v\u1edbi nhau.<\/li>\n
            • S\u01a1 \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i:<\/strong>S\u01a1 \u0111\u1ed3 tr\u1ea1ng th\u00e1i cho th\u1ea5y c\u00e1ch m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 th\u1ec3 hi\u1ec7n c\u1ea5u h\u00ecnh c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng trong m\u1ed9t tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3.<\/li>\n
            • S\u01a1 \u0111\u1ed3 l\u1edbp:<\/strong>N\u1ec1n t\u1ea3ng. M\u1ed7i \u0111\u1ed1i t\u01b0\u1ee3ng trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ph\u1ea3i t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ed9t l\u1edbp trong s\u01a1 \u0111\u1ed3 l\u1edbp.<\/li>\n<\/ul>\n

              S\u1eed d\u1ee5ng ch\u00fang c\u00f9ng nhau \u0111\u1ea3m b\u1ea3o t\u00e0i li\u1ec7u c\u1ee7a b\u1ea1n bao qu\u00e1t c\u1ea3 thi\u1ebft k\u1ebf (c\u1ea5u tr\u00fac) v\u00e0 th\u1ef1c thi (h\u00e0nh vi).<\/p>\n

              \ud83d\udcca Ph\u00e2n t\u00edch c\u00e1c m\u1ed1i quan h\u1ec7 \u1edf m\u1ee9c \u0111\u1ed9 s\u00e2u<\/h2>\n

              Hi\u1ec3u r\u00f5 c\u00e1c chi ti\u1ebft c\u1ee7a c\u00e1c li\u00ean k\u1ebft l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng. Kh\u00f4ng ph\u1ea3i m\u1ecdi li\u00ean k\u1ebft \u0111\u1ec1u nh\u01b0 nhau. M\u1ed9t s\u1ed1 th\u1ec3 hi\u1ec7n quy\u1ec1n s\u1edf h\u1eefu, s\u1ed1 kh\u00e1c th\u1ec3 hi\u1ec7n thao t\u00e1c \u0111i\u1ec1u h\u01b0\u1edbng.<\/p>\n

              Li\u00ean k\u1ebft s\u1edf h\u1eefu<\/h3>\n

              Ch\u00fang cho th\u1ea5y m\u1ed1i quan h\u1ec7 m\u1ea1nh m\u1ebd n\u01a1i m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c. Trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, \u0111i\u1ec1u n\u00e0y th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n, \u0111\u00f4i khi c\u00f3 h\u00ecnh thoi \u0111\u1ea7y m\u00e0u t\u1ea1i \u0111\u1ea7u ngu\u1ed3n. V\u00ed d\u1ee5, m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng Project<\/code> c\u00f3 th\u1ec3 s\u1edf h\u1eefu nhi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng Task<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n

              Li\u00ean k\u1ebft \u0111i\u1ec1u h\u01b0\u1edbng<\/h3>\n

              Ch\u00fang cho ph\u00e9p m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng truy c\u1eadp v\u00e0o \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c. Ch\u00fang kh\u00f4ng nh\u1ea5t thi\u1ebft ng\u1ee5 \u00fd quy\u1ec1n s\u1edf h\u1eefu. V\u00ed d\u1ee5, m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng Driver<\/code> c\u00f3 th\u1ec3 \u0111i\u1ec1u h\u01b0\u1edbng \u0111\u1ebfn m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng Car<\/code> \u0111\u1ed1i t\u01b0\u1ee3ng, nh\u01b0ng chi\u1ebfc xe v\u1eabn c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n ng\u01b0\u1eddi l\u00e1i.<\/p>\n

              T\u1ed5ng h\u1ee3p so v\u1edbi K\u1ebft h\u1ee3p<\/h3>\n

              M\u1eb7c d\u00f9 \u0111\u00e2y l\u00e0 c\u00e1c kh\u00e1i ni\u1ec7m \u1edf c\u1ea5p \u0111\u1ed9 l\u1edbp, ch\u00fang th\u1ec3 hi\u1ec7n trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng th\u00f4ng qua m\u1eadt \u0111\u1ed9 v\u00e0 b\u1ea3n ch\u1ea5t c\u1ee7a c\u00e1c li\u00ean k\u1ebft. K\u1ebft h\u1ee3p ng\u1ee5 \u00fd r\u1eb1ng n\u1ebfu \u0111\u1ed1i t\u01b0\u1ee3ng cha b\u1ecb h\u1ee7y, c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng con c\u0169ng s\u1ebd b\u1ecb h\u1ee7y. T\u1ed5ng h\u1ee3p ng\u1ee5 \u00fd r\u1eb1ng \u0111\u1ed1i t\u01b0\u1ee3ng con c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp.<\/p>\n

              \ud83e\uddea T\u00ecnh hu\u1ed1ng v\u00ed d\u1ee5: H\u1ec7 th\u1ed1ng Th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed<\/h2>\n

              H\u00e3y h\u00ecnh dung m\u1ed9t t\u00ecnh hu\u1ed1ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 th\u1ea5y c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o. H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t kho\u1ea3nh kh\u1eafc ch\u1ee5p l\u1ea1i h\u00e0nh \u0111\u1ed9ng m\u1ed9t ng\u01b0\u1eddi d\u00f9ng l\u01b0\u1edbt qua c\u00e1c s\u1ea3n ph\u1ea9m.<\/p>\n

              C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng tham gia:<\/strong><\/p>\n

                \n
              • :Ng\u01b0\u1eddi d\u00f9ng<\/code> (Th\u1ec3 hi\u1ec7n: alice<\/code>)<\/li>\n
              • :Gi\u1ecf h\u00e0ng<\/code> (Th\u1ec3 hi\u1ec7n: cart_101<\/code>)<\/li>\n
              • :S\u1ea3n ph\u1ea9m<\/code> (Th\u1ec3 hi\u1ec7n: prod_laptop<\/code>)<\/li>\n
              • :\u0110\u01a1n h\u00e0ng<\/code> (Th\u1ec3 hi\u1ec7n: order_55<\/code>)<\/li>\n<\/ul>\n

                C\u00e1c m\u1ed1i quan h\u1ec7:<\/strong><\/p>\n

                  \n
                • alice<\/code> s\u1edf h\u1eefu cart_101<\/code>.<\/li>\n
                • cart_101<\/code> ch\u1ee9a prod_laptop<\/code>.<\/li>\n
                • alice<\/code> \u0111\u00e3 \u0111\u1eb7t order_55<\/code>.<\/li>\n<\/ul>\n

                  Trong s\u01a1 \u0111\u1ed3, alice:User<\/code> s\u1ebd c\u00f3 c\u00e1c thu\u1ed9c t\u00ednh nh\u01b0 email: alice@example.com<\/code>. cart_101:ShoppingCart<\/code> s\u1ebd c\u00f3 total: 1200.00<\/code>. C\u00e1c \u0111\u01b0\u1eddng n\u1ed1i gi\u1eefa ch\u00fang s\u1ebd \u0111\u01b0\u1ee3c g\u00e1n nh\u00e3n l\u00e0 owns<\/code>, contains<\/code>, v\u00e0 placed<\/code> l\u1ea7n l\u01b0\u1ee3t. C\u00e1ch nh\u00ecn c\u1ee5 th\u1ec3 n\u00e0y l\u00e0m r\u00f5 lu\u1ed3ng d\u1eef li\u1ec7u t\u1ed1t h\u01a1n so v\u1edbi \u0111\u1ecbnh ngh\u0129a l\u1edbp tr\u1eebu t\u01b0\u1ee3ng ri\u00eang l\u1ebb.<\/p>\n

                  \ud83d\udee1\ufe0f C\u00e1c c\u00e2n nh\u1eafc v\u1ec1 b\u1ea3o m\u1eadt v\u00e0 quy\u1ec1n ri\u00eang t\u01b0<\/h2>\n

                  Khi chia s\u1ebb s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong t\u00e0i li\u1ec7u, h\u00e3y c\u1ea9n tr\u1ecdng v\u1ec1 \u0111\u1ed9 nh\u1ea1y c\u1ea3m c\u1ee7a d\u1eef li\u1ec7u. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng th\u01b0\u1eddng ch\u1ee9a c\u00e1c gi\u00e1 tr\u1ecb d\u1eef li\u1ec7u th\u1ef1c t\u1ebf ho\u1eb7c \u0111\u01b0\u1ee3c m\u00f4 ph\u1ecfng.<\/p>\n

                    \n
                  • \u1ea8n danh h\u00f3a d\u1eef li\u1ec7u:<\/strong> Kh\u00f4ng s\u1eed d\u1ee5ng t\u00ean th\u1eadt, s\u1ed1 \u0111i\u1ec7n tho\u1ea1i ho\u1eb7c \u0111\u1ecba ch\u1ec9 trong c\u00e1c s\u01a1 \u0111\u1ed3 c\u00f4ng khai. H\u00e3y s\u1eed d\u1ee5ng c\u00e1c ch\u1ed7 tr\u1ed1ng thay th\u1ebf.<\/li>\n
                  • Che gi\u1ea5u c\u00e1c tr\u01b0\u1eddng nh\u1ea1y c\u1ea3m:<\/strong> N\u1ebfu hi\u1ec3n th\u1ecb c\u00e1c m\u00e3 x\u00e1c th\u1ef1c ho\u1eb7c m\u1eadt kh\u1ea9u, h\u00e3y che gi\u1ea5u c\u00e1c gi\u00e1 tr\u1ecb \u0111\u00f3 (v\u00ed d\u1ee5, token: ******<\/code>).<\/li>\n
                  • Ch\u1ec9 d\u00f9ng n\u1ed9i b\u1ed9:<\/strong> Ghi ch\u00fa c\u00e1c s\u01a1 \u0111\u1ed3 ch\u1ee9a d\u1eef li\u1ec7u th\u1eddi gian ch\u1ea1y chi ti\u1ebft l\u00e0 n\u1ed9i b\u1ed9. Ch\u00fang c\u00f3 th\u1ec3 ti\u1ebft l\u1ed9 logic m\u00e0 \u0111\u1ed1i th\u1ee7 c\u1ea1nh tranh c\u00f3 th\u1ec3 l\u1ee3i d\u1ee5ng.<\/li>\n<\/ul>\n

                    \ud83e\udded Nh\u1eefng suy ngh\u0129 cu\u1ed1i c\u00f9ng v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a<\/h2>\n

                    Vi\u1ec7c x\u00e2y d\u1ef1ng s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n qua th\u1ef1c h\u00e0nh. N\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa \u0111\u1ed9 ch\u00ednh x\u00e1c v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt v\u00e0 \u0111\u1ed9 r\u00f5 r\u00e0ng v\u1ec1 m\u1eb7t tr\u1ef1c quan. B\u1ea1n kh\u00f4ng ch\u1ec9 \u0111ang v\u1ebd c\u00e1c h\u00ecnh h\u1ed9p; b\u1ea1n \u0111ang ghi l\u1ea1i th\u1ef1c t\u1ebf c\u1ee7a ph\u1ea7n m\u1ec1m c\u1ee7a m\u00ecnh.<\/p>\n

                    B\u1eaft \u0111\u1ea7u nh\u1ecf g\u1ecdn. Ch\u1ecdn m\u1ed9t t\u00ednh n\u0103ng duy nh\u1ea5t. M\u00f4 h\u00ecnh h\u00f3a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan. X\u00e1c minh r\u1eb1ng c\u00e1c li\u00ean k\u1ebft ph\u00f9 h\u1ee3p v\u1edbi \u0111\u1ecbnh ngh\u0129a l\u1edbp c\u1ee7a b\u1ea1n. Khi b\u1ea1n c\u1ea3m th\u1ea5y tho\u1ea3i m\u00e1i, h\u00e3y m\u1edf r\u1ed9ng sang c\u00e1c h\u1ec7 th\u1ed1ng con l\u1edbn h\u01a1n. H\u00e3y nh\u1edb, m\u1ee5c ti\u00eau l\u00e0 s\u1ef1 hi\u1ec3u bi\u1ebft, ch\u1ee9 kh\u00f4ng ph\u1ea3i s\u1ef1 ho\u00e0n h\u1ea3o. M\u1ed9t s\u01a1 \u0111\u1ed3 ch\u00ednh x\u00e1c 80% nh\u01b0ng \u0111\u01b0\u1ee3c truy\u1ec1n \u0111\u1ea1t r\u00f5 r\u00e0ng s\u1ebd c\u00f3 gi\u00e1 tr\u1ecb h\u01a1n m\u1ed9t s\u01a1 \u0111\u1ed3 ho\u00e0n h\u1ea3o m\u00e0 kh\u00f4ng ai c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c.<\/p>\n

                    Gi\u1eef cho k\u00fd hi\u1ec7u c\u1ee7a b\u1ea1n nh\u1ea5t qu\u00e1n. Gi\u1eef cho nh\u00e3n m\u00f4 t\u1ea3 r\u00f5 r\u00e0ng. V\u00e0 lu\u00f4n nh\u1edb r\u1eb1ng nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y ph\u1ee5c v\u1ee5 cho c\u1ea3 \u0111\u1ed9i. N\u1ebfu ch\u00fang gi\u00fap \u0111\u1ed3ng nghi\u1ec7p c\u1ee7a b\u1ea1n hi\u1ec3u h\u1ec7 th\u1ed1ng nhanh h\u01a1n, b\u1ea1n \u0111\u00e3 th\u00e0nh c\u00f4ng.<\/p>\n

                    B\u1eb1ng c\u00e1ch th\u00e0nh th\u1ea1o nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y, b\u1ea1n n\u00e2ng cao kh\u1ea3 n\u0103ng thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng v\u1eefng ch\u1eafc v\u00e0 truy\u1ec1n \u0111\u1ea1t c\u00e1c \u00fd t\u01b0\u1edfng ph\u1ee9c t\u1ea1p m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. N\u1ec1n t\u1ea3ng n\u00e0y h\u1ed7 tr\u1ee3 m\u00e3 ngu\u1ed3n t\u1ed1t h\u01a1n, \u00edt l\u1ed7i h\u01a1n v\u00e0 h\u1ee3p t\u00e1c tr\u01a1n tru h\u01a1n trong su\u1ed1t v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m.<\/p>\n","protected":false},"excerpt":{"rendered":"

                    Hi\u1ec3u \u0111\u01b0\u1ee3c ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m c\u1ee7a b\u1ea1n \u0111\u00f2i h\u1ecfi nhi\u1ec1u h\u01a1n ch\u1ec9 vi\u1ec7c vi\u1ebft m\u00e3. N\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 tr\u1ef1c quan h\u00f3a. Trong khi s\u01a1 \u0111\u1ed3 l\u1edbp th\u1ec3 hi\u1ec7n b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf c\u1ee7a h\u1ec7 th\u1ed1ng c\u1ee7a b\u1ea1n,S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UMLghi l\u1ea1i tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u00f3 t\u1ea1i m\u1ed9t th\u1eddi […]<\/p>\n","protected":false},"author":1,"featured_media":1525,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[13],"tags":[44,45],"class_list":["post-1524","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-object-diagram"],"yoast_head":"\nH\u01b0\u1edbng d\u1eabn nhanh cho s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML \ud83d\udcca<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch t\u1ea1o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. 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