{"id":1459,"date":"2026-03-27T19:57:57","date_gmt":"2026-03-27T19:57:57","guid":{"rendered":"https:\/\/www.method-post.com\/vn\/real-world-library-system-class-diagrams\/"},"modified":"2026-03-27T19:57:57","modified_gmt":"2026-03-27T19:57:57","slug":"real-world-library-system-class-diagrams","status":"publish","type":"post","link":"https:\/\/www.method-post.com\/vn\/real-world-library-system-class-diagrams\/","title":{"rendered":"Nghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p th\u1ef1c t\u1ebf: L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n b\u1eb1ng c\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp r\u00f5 r\u00e0ng"},"content":{"rendered":"

Thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m b\u1eaft \u0111\u1ea7u tr\u01b0\u1edbc khi vi\u1ebft b\u1ea5t k\u1ef3 d\u00f2ng m\u00e3 n\u00e0o. N\u00f3 b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c hi\u1ec3u kh\u00f4ng gian v\u1ea5n \u0111\u1ec1 v\u00e0 t\u1ed5 ch\u1ee9c th\u00f4ng tin th\u00e0nh c\u00e1c c\u1ea5u tr\u00fac h\u1ee3p l\u00fd. S\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf cho c\u00e1c h\u1ec7 th\u1ed1ng h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, m\u00f4 t\u1ea3 c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a ph\u1ea7n m\u1ec1m. Trong h\u01b0\u1edbng d\u1eabn n\u00e0y, ch\u00fang ta s\u1ebd \u0111i qua m\u1ed9t t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf: m\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd th\u01b0 vi\u1ec7n. Ch\u00fang ta s\u1ebd t\u1eadp trung v\u00e0o s\u1ef1 r\u00f5 r\u00e0ng, \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec.<\/p>\n

\n
\"A<\/figure>\n<\/div>\n

\ud83e\uddf1 Hi\u1ec3u n\u1ec1n t\u1ea3ng c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp<\/h2>\n

S\u01a1 \u0111\u1ed3 l\u1edbp l\u00e0 m\u1ed9t lo\u1ea1i s\u01a1 \u0111\u1ed3 c\u1ee7a Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t (UML). N\u00f3 m\u00f4 t\u1ea3 c\u1ea5u tr\u00fac c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh, thao t\u00e1c v\u00e0 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. Bi\u1ec3u di\u1ec5n tr\u1ef1c quan n\u00e0y cho ph\u00e9p c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 b\u00ean li\u00ean quan giao ti\u1ebfp c\u00e1c y\u00eau c\u1ea7u d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p m\u00e0 kh\u00f4ng g\u00e2y hi\u1ec3u l\u1ea7m.<\/p>\n

Khi x\u00e2y d\u1ef1ng c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 c\u1ed1t l\u00f5i ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh:<\/p>\n

    \n
  • L\u1edbp:<\/strong> Nh\u1eefng kh\u1ed1i x\u00e2y d\u1ef1ng \u0111\u1ea1i di\u1ec7n cho c\u00e1c th\u1ef1c th\u1ec3 trong th\u1ebf gi\u1edbi th\u1ef1c ho\u1eb7c c\u00e1c kh\u00e1i ni\u1ec7m tr\u1eebu t\u01b0\u1ee3ng.<\/li>\n
  • Thu\u1ed9c t\u00ednh:<\/strong> D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong m\u1ed9t l\u1edbp, ch\u1eb3ng h\u1ea1n nh\u01b0 t\u00ean, ID ho\u1eb7c ng\u00e0y th\u00e1ng.<\/li>\n
  • Thao t\u00e1c:<\/strong> C\u00e1c h\u00e0nh vi ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c m\u00e0 m\u1ed9t l\u1edbp c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n, nh\u01b0 m\u01b0\u1ee3n m\u1ed9t v\u1eadt ph\u1ea9m ho\u1eb7c tr\u1ea3 l\u1ea1i n\u00f3.<\/li>\n
  • M\u1ed1i quan h\u1ec7:<\/strong> C\u00e1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c l\u1edbp, cho th\u1ea5y ch\u00fang t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau nh\u01b0 th\u1ebf n\u00e0o.<\/li>\n<\/ul>\n

    \u0110\u1ed1i v\u1edbi m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n, \u0111\u1ed9 ch\u00ednh x\u00e1c l\u00e0 r\u1ea5t quan tr\u1ecdng. M\u1ed9t cu\u1ed1n s\u00e1ch kh\u00f4ng gi\u1ed1ng nh\u01b0 m\u1ed9t giao d\u1ecbch m\u01b0\u1ee3n, v\u00e0 m\u1ed9t th\u00e0nh vi\u00ean kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t nh\u00e2n vi\u00ean th\u01b0 vi\u1ec7n. Vi\u1ec7c ph\u00e2n bi\u1ec7t r\u00f5 c\u00e1c th\u1ef1c th\u1ec3 n\u00e0y gi\u00fap ng\u0103n ng\u1eeba l\u1ed7i logic trong qu\u00e1 tr\u00ecnh tri\u1ec3n khai.<\/p>\n

    \ud83d\udccb X\u00e1c \u0111\u1ecbnh t\u00ecnh hu\u1ed1ng: Y\u00eau c\u1ea7u h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n<\/h2>\n

    Tr\u01b0\u1edbc khi v\u1ebd c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i gi\u1eefa c\u00e1c h\u1ed9p, ch\u00fang ta ph\u1ea3i hi\u1ec3u r\u00f5 c\u00e1c quy t\u1eafc kinh doanh. M\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n qu\u1ea3n l\u00fd c\u00e1c v\u1eadt ph\u1ea9m v\u1eadt l\u00fd ho\u1eb7c s\u1ed1 h\u00f3a, nh\u1eefng ng\u01b0\u1eddi truy c\u1eadp ch\u00fang, v\u00e0 c\u00e1c giao d\u1ecbch di\u1ec5n ra. H\u00e3y xem x\u00e9t c\u00e1c y\u00eau c\u1ea7u ch\u1ee9c n\u0103ng sau:<\/p>\n

      \n
    • C\u00e1c th\u00e0nh vi\u00ean c\u00f3 th\u1ec3 m\u01b0\u1ee3n nhi\u1ec1u cu\u1ed1n s\u00e1ch c\u00f9ng m\u1ed9t l\u00fac.<\/li>\n
    • M\u1ed9t cu\u1ed1n s\u00e1ch ch\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u01b0\u1ee3n b\u1edfi m\u1ed9t th\u00e0nh vi\u00ean t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m.<\/li>\n
    • C\u00e1c nh\u00e2n vi\u00ean th\u01b0 vi\u1ec7n qu\u1ea3n l\u00fd kho h\u00e0ng v\u00e0 h\u1ed7 tr\u1ee3 th\u00e0nh vi\u00ean.<\/li>\n
    • C\u00e1c cu\u1ed1n s\u00e1ch c\u00f3 danh m\u1ee5c, t\u00e1c gi\u1ea3 v\u00e0 \u0111\u1ecbnh danh duy nh\u1ea5t.<\/li>\n
    • C\u00e1c kho\u1ea3n vay c\u00f3 ng\u00e0y \u0111\u1ebfn h\u1ea1n v\u00e0 c\u00e1c ch\u1ec9 b\u00e1o tr\u1ea1ng th\u00e1i.<\/li>\n<\/ul>\n

      Nh\u1eefng quy t\u1eafc n\u00e0y quy \u0111\u1ecbnh c\u1ea5u tr\u00fac c\u1ee7a s\u01a1 \u0111\u1ed3 c\u1ee7a ch\u00fang ta. B\u00e2y gi\u1edd ch\u00fang ta s\u1ebd ph\u00e2n t\u00edch qu\u00e1 tr\u00ecnh m\u00f4 h\u00ecnh h\u00f3a t\u1eebng b\u01b0\u1edbc m\u1ed9t.<\/p>\n

      \ud83d\udd0d B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh c\u00e1c l\u1edbp \u1ee9ng c\u1eed vi\u00ean<\/h2>\n

      B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean trong m\u00f4 h\u00ecnh h\u00f3a l\u00e0 ph\u00e2n t\u00edch danh t\u1eeb. Ch\u00fang ta qu\u00e9t qua c\u00e1c y\u00eau c\u1ea7u \u0111\u1ec3 t\u00ecm c\u00e1c danh t\u1eeb \u0111\u1ea1i di\u1ec7n cho nh\u1eefng kh\u00e1i ni\u1ec7m quan tr\u1ecdng. Kh\u00f4ng ph\u1ea3i m\u1ecdi danh t\u1eeb n\u00e0o c\u0169ng tr\u1edf th\u00e0nh m\u1ed9t l\u1edbp, nh\u01b0ng ch\u00fang t\u1ea1o th\u00e0nh t\u1eadp h\u1ee3p ban \u0111\u1ea7u c\u00e1c \u1ee9ng c\u1eed vi\u00ean.<\/p>\n

      T\u1eeb c\u00e1c y\u00eau c\u1ea7u ph\u00eda tr\u00ean, ch\u00fang ta tr\u00edch xu\u1ea5t c\u00e1c l\u1edbp ti\u1ec1m n\u0103ng sau:<\/p>\n

        \n
      • S\u00e1ch:<\/strong> \u0110\u1ea1i di\u1ec7n cho v\u1eadt ph\u1ea9m v\u1eadt l\u00fd ho\u1eb7c k\u1ef9 thu\u1eadt s\u1ed1 c\u00f3 s\u1eb5n \u0111\u1ec3 cho m\u01b0\u1ee3n.<\/li>\n
      • Th\u00e0nh vi\u00ean:<\/strong> \u0110\u1ea1i di\u1ec7n cho ng\u01b0\u1eddi m\u01b0\u1ee3n h\u00e0ng h\u00f3a.<\/li>\n
      • Th\u1ee7 th\u01b0:<\/strong> \u0110\u1ea1i di\u1ec7n cho nh\u00e2n vi\u00ean qu\u1ea3n l\u00fd h\u1ec7 th\u1ed1ng.<\/li>\n
      • Kho\u1ea3n vay:<\/strong> \u0110\u1ea1i di\u1ec7n cho giao d\u1ecbch gi\u1eefa m\u1ed9t th\u00e0nh vi\u00ean v\u00e0 m\u1ed9t cu\u1ed1n s\u00e1ch.<\/li>\n
      • Th\u1ec3 lo\u1ea1i:<\/strong> \u0110\u1ea1i di\u1ec7n cho th\u1ec3 lo\u1ea1i ho\u1eb7c khu v\u1ef1c c\u1ee7a th\u01b0 vi\u1ec7n.<\/li>\n<\/ul>\n

        M\u1ed9t s\u1ed1 danh t\u1eeb qu\u00e1 chung chung ho\u1eb7c \u0111\u1ea1i di\u1ec7n cho d\u1eef li\u1ec7u thay v\u00ec \u0111\u1ed1i t\u01b0\u1ee3ng. V\u00ed d\u1ee5, \u201cti\u00eau \u0111\u1ec1\u201d hay \u201cng\u00e0y\u201d l\u00e0 thu\u1ed9c t\u00ednh, ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 l\u1edbp. Ch\u00fang ta lo\u1ea1i b\u1ecf nh\u1eefng danh t\u1eeb n\u00e0y \u0111\u1ec3 gi\u1eef cho m\u00f4 h\u00ecnh \u0111\u01b0\u1ee3c g\u1ecdn g\u00e0ng.<\/p>\n

        \ud83d\udcdd B\u01b0\u1edbc 2: X\u00e1c \u0111\u1ecbnh thu\u1ed9c t\u00ednh v\u00e0 thao t\u00e1c<\/h2>\n

        Sau khi x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c c\u00e1c l\u1edbp, ch\u00fang ta x\u00e1c \u0111\u1ecbnh tr\u1ea1ng th\u00e1i n\u1ed9i b\u1ed9 v\u00e0 kh\u1ea3 n\u0103ng c\u1ee7a ch\u00fang. M\u1ed7i l\u1edbp c\u1ea7n d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng v\u00e0 c\u00e1c h\u00e0nh \u0111\u1ed9ng c\u1ee5 th\u1ec3 m\u00e0 n\u00f3 c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n.<\/p>\n

        H\u00e3y c\u00f9ng xem x\u00e9t S\u00e1ch<\/strong> l\u1edbp chi ti\u1ebft:<\/p>\n

          \n
        • Thu\u1ed9c t\u00ednh:<\/strong>\n
            \n
          • bookId (Chu\u1ed7i): M\u00e3 \u0111\u1ecbnh danh duy nh\u1ea5t.<\/li>\n
          • title (Chu\u1ed7i): T\u00ean c\u1ee7a t\u00e1c ph\u1ea9m.<\/li>\n
          • author (Chu\u1ed7i): T\u00e1c gi\u1ea3 c\u1ee7a t\u00e1c ph\u1ea9m.<\/li>\n
          • isbn (Chu\u1ed7i): S\u1ed1 chu\u1ea9n qu\u1ed1c t\u1ebf v\u1ec1 s\u00e1ch.<\/li>\n
          • status (B\u1ea3n ghi): C\u00f3 s\u1eb5n, \u0110ang m\u01b0\u1ee3n, M\u1ea5t.<\/li>\n<\/ul>\n<\/li>\n
          • Thao t\u00e1c:<\/strong>\n
              \n
            • getAvailability(): Boolean<\/li>\n
            • updateStatus(): Void<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n

              C\u00e1c b\u1ed9 ch\u1ecdn t\u00ednh kh\u1ea3 d\u1ee5ng c\u0169ng r\u1ea5t quan tr\u1ecdng. C\u00e1c thu\u1ed9c t\u00ednh ri\u00eang t\u01b0 (\u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u b\u1eb1ng “-<\/code>) l\u00e0 n\u1ed9i b\u1ed9 c\u1ee7a l\u1edbp. C\u00e1c thu\u1ed9c t\u00ednh c\u00f4ng khai (\u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u b\u1eb1ng “+<\/code>) c\u00f3 th\u1ec3 truy c\u1eadp t\u1eeb b\u00ean ngo\u00e0i. Trong m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n, tr\u1ea1ng th\u00e1i c\u1ee7a m\u1ed9t cu\u1ed1n s\u00e1ch c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u00f4ng khai \u0111\u1ec3 giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng hi\u1ec3n th\u1ecb, trong khi d\u1eef li\u1ec7u x\u1eed l\u00fd n\u1ed9i b\u1ed9 v\u1eabn gi\u1eef b\u00ed m\u1eadt.<\/p>\n

              \ud83d\udd17 B\u01b0\u1edbc 3: Thi\u1ebft l\u1eadp m\u1ed1i quan h\u1ec7<\/h2>\n

              C\u00e1c l\u1edbp kh\u00f4ng t\u1ed3n t\u1ea1i c\u00f4 l\u1eadp. Ch\u00fang t\u01b0\u01a1ng t\u00e1c th\u00f4ng qua c\u00e1c m\u1ed1i quan h\u1ec7. Hi\u1ec3u r\u00f5 lo\u1ea1i m\u1ed1i quan h\u1ec7 l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c.<\/p>\n

              Ch\u00fang ta ch\u1ee7 y\u1ebfu s\u1eed d\u1ee5ng c\u00e1c m\u1ed1i li\u00ean k\u1ebft \u0111\u1ec3 k\u1ebft n\u1ed1i c\u00e1c l\u1edbp. M\u1ed9t m\u1ed1i li\u00ean k\u1ebft \u0111\u1ea1i di\u1ec7n cho m\u1ed9t li\u00ean k\u1ebft c\u1ea5u tr\u00fac n\u01a1i m\u1ed9t l\u1edbp bi\u1ebft \u0111\u1ebfn l\u1edbp kh\u00e1c.<\/p>\n

              V\u00ed d\u1ee5 m\u1ed1i li\u00ean k\u1ebft: Th\u00e0nh vi\u00ean v\u00e0 S\u00e1ch<\/h3>\n

              M\u1ed9t Th\u00e0nh vi\u00ean m\u01b0\u1ee3n m\u1ed9t S\u00e1ch. \u0110\u00e2y l\u00e0 m\u1ed9t m\u1ed1i li\u00ean k\u1ebft tr\u1ef1c ti\u1ebfp. Tuy nhi\u00ean, ch\u00fang ta ph\u1ea3i x\u00e1c \u0111\u1ecbnh t\u00ednh b\u1ed9i s\u1ed1. M\u1ed9t th\u00e0nh vi\u00ean c\u00f3 th\u1ec3 m\u01b0\u1ee3n bao nhi\u00eau cu\u1ed1n s\u00e1ch? Bao nhi\u00eau th\u00e0nh vi\u00ean c\u00f3 th\u1ec3 m\u01b0\u1ee3n m\u1ed9t cu\u1ed1n s\u00e1ch c\u1ee5 th\u1ec3?<\/p>\n

              Ch\u00fang ta c\u00f3 th\u1ec3 bi\u1ec3u di\u1ec5n \u0111i\u1ec1u n\u00e0y trong m\u1ed9t b\u1ea3ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u00f5 r\u00e0ng:<\/p>\n\n\n\n\n\n\n
              L\u1edbp A<\/th>\nM\u1ed1i quan h\u1ec7<\/th>\nL\u1edbp B<\/th>\nS\u1ed1 l\u01b0\u1ee3ng<\/th>\nGi\u1ea3i th\u00edch<\/th>\n<\/tr>\n<\/thead>\n
              Th\u00e0nh vi\u00ean<\/td>\nM\u01b0\u1ee3n<\/td>\nS\u00e1ch<\/td>\n1 \u0111\u1ebfn 0..*<\/td>\nM\u1ed9t th\u00e0nh vi\u00ean c\u00f3 th\u1ec3 m\u01b0\u1ee3n kh\u00f4ng ho\u1eb7c nhi\u1ec1u s\u00e1ch.<\/td>\n<\/tr>\n
              S\u00e1ch<\/td>\n\u0110\u01b0\u1ee3c m\u01b0\u1ee3n b\u1edfi<\/td>\nTh\u00e0nh vi\u00ean<\/td>\n0..1 \u0111\u1ebfn 1<\/td>\nM\u1ed9t cu\u1ed1n s\u00e1ch \u0111\u01b0\u1ee3c m\u01b0\u1ee3n b\u1edfi t\u1ed1i \u0111a m\u1ed9t th\u00e0nh vi\u00ean c\u00f9ng m\u1ed9t l\u00fac.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              L\u01b0u \u00fd k\u00fd hi\u1ec7u 0..*<\/code> k\u00fd hi\u1ec7u. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng ho\u1eb7c nhi\u1ec1u. K\u00fd hi\u1ec7u 0..1<\/code> c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng c\u00f3 ho\u1eb7c ch\u1ec9 m\u1ed9t. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y ng\u0103n ng\u1eeba c\u00e1c l\u1ed7i logic khi hai ng\u01b0\u1eddi c\u00f3 th\u1ec3 m\u01b0\u1ee3n c\u00f9ng m\u1ed9t cu\u1ed1n s\u00e1ch m\u1ed9t l\u00fac.<\/p>\n

              L\u1edbp M\u01b0\u1ee3n: Gi\u1ea3i quy\u1ebft M\u1ed1i quan h\u1ec7 Nhi\u1ec1u – Nhi\u1ec1u<\/h3>\n

              N\u1ebfu m\u1ed9t Th\u00e0nh vi\u00ean c\u00f3 th\u1ec3 m\u01b0\u1ee3n nhi\u1ec1u S\u00e1ch, v\u00e0 m\u1ed9t S\u00e1ch c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u01b0\u1ee3n b\u1edfi nhi\u1ec1u Th\u00e0nh vi\u00ean (theo th\u1eddi gian), \u0111i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed1i quan h\u1ec7 nhi\u1ec1u – nhi\u1ec1u. Trong thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng, m\u1ed9t m\u1ed1i quan h\u1ec7 nhi\u1ec1u – nhi\u1ec1u th\u01b0\u1eddng \u0111\u00f2i h\u1ecfi m\u1ed9t l\u1edbp trung gian \u0111\u1ec3 l\u01b0u tr\u1eef c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a ch\u00ednh m\u1ed1i quan h\u1ec7 \u0111\u00f3.<\/p>\n

              Trong tr\u01b0\u1eddng h\u1ee3p n\u00e0y, l\u1edbp M\u01b0\u1ee3n<\/strong>l\u1edbp n\u00e0y \u0111\u00f3ng vai tr\u00f2 nh\u01b0 c\u00e2y c\u1ea7u n\u1ed1i. N\u00f3 l\u01b0u tr\u1eef ng\u00e0y m\u01b0\u1ee3n, ng\u00e0y \u0111\u1ebfn h\u1ea1n v\u00e0 ng\u00e0y tr\u1ea3. \u0110i\u1ec1u n\u00e0y chuy\u1ec3n \u0111\u1ed5i m\u1ed1i quan h\u1ec7 th\u00e0nh hai m\u1ed1i quan h\u1ec7 m\u1ed9t – nhi\u1ec1u:<\/p>\n

                \n
              • Th\u00e0nh vi\u00ean 1 \u0111\u1ebfn Nhi\u1ec1u M\u01b0\u1ee3n<\/li>\n
              • S\u00e1ch 1 \u0111\u1ebfn Nhi\u1ec1u M\u01b0\u1ee3n<\/li>\n<\/ul>\n

                C\u1ea5u tr\u00fac n\u00e0y cho ph\u00e9p ch\u00fang ta l\u01b0u tr\u1eef c\u00e1c chi ti\u1ebft c\u1ee5 th\u1ec3 v\u1ec1 t\u1eebng giao d\u1ecbch m\u00e0 kh\u00f4ng l\u00e0m r\u1ed1i l\u1edbp Th\u00e0nh vi\u00ean hay l\u1edbp S\u00e1ch.<\/p>\n

                \ud83c\udf33 B\u01b0\u1edbc 4: X\u1eed l\u00fd K\u1ebf th\u1eeba v\u00e0 T\u1ed5ng qu\u00e1t h\u00f3a<\/h2>\n

                Kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c l\u1edbp \u0111\u1ec1u kh\u00e1c bi\u1ec7t. M\u1ed9t s\u1ed1 chia s\u1ebb c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m chung. K\u1ebf th\u1eeba cho ph\u00e9p ch\u00fang ta gi\u1ea3m thi\u1ec3u s\u1ef1 tr\u00f9ng l\u1eb7p b\u1eb1ng c\u00e1ch t\u1ea1o ra m\u1ed9t c\u1ea5u tr\u00fac ph\u00e2n c\u1ea5p.<\/p>\n

                H\u00e3y xem x\u00e9t nh\u1eefng ng\u01b0\u1eddi t\u01b0\u01a1ng t\u00e1c v\u1edbi th\u01b0 vi\u1ec7n. C\u1ea3 Th\u00e0nh vi\u00ean v\u00e0 Th\u1ee7 th\u01b0 \u0111\u1ec1u l\u00e0 ng\u01b0\u1eddi d\u00f9ng c\u1ee7a h\u1ec7 th\u1ed1ng. H\u1ecd chia s\u1ebb c\u00e1c thu\u1ed9c t\u00ednh chung nh\u01b0 t\u00ean<\/code>, th\u00f4ng tin li\u00ean h\u1ec7<\/code>, v\u00e0 m\u1eadt kh\u1ea9u<\/code>. Tuy nhi\u00ean, Th\u1ee7 th\u01b0 c\u00f3 quy\u1ec1n h\u1ea1n m\u00e0 Th\u00e0nh vi\u00ean kh\u00f4ng c\u00f3, ch\u1eb3ng h\u1ea1n nh\u01b0 kh\u1ea3 n\u0103ng th\u00eam s\u00e1ch.<\/p>\n

                Ch\u00fang ta c\u00f3 th\u1ec3 m\u00f4 h\u00ecnh h\u00f3a \u0111i\u1ec1u n\u00e0y b\u1eb1ng m\u1ed9t l\u1edbp si\u00eau tr\u1eebu t\u01b0\u1ee3ng g\u1ecdi l\u00e0 Ng\u01b0\u1eddi d\u00f9ng<\/strong>:<\/p>\n

                  \n
                • Ng\u01b0\u1eddi d\u00f9ng (Tr\u1eebu t\u01b0\u1ee3ng)<\/strong>\n
                    \n
                  • t\u00ean: Chu\u1ed7i<\/li>\n
                  • email: Chu\u1ed7i<\/li>\n
                  • m\u1eadt kh\u1ea9u: Chu\u1ed7i<\/li>\n<\/ul>\n<\/li>\n
                  • Th\u00e0nh vi\u00ean<\/strong> m\u1edf r\u1ed9ng User<\/li>\n
                  • Th\u01b0 vi\u1ec7n vi\u00ean<\/strong> m\u1edf r\u1ed9ng User<\/li>\n<\/ul>\n

                    C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y gi\u00fap s\u01a1 \u0111\u1ed3 \u0111\u01b0\u1ee3c g\u1ecdn g\u00e0ng. N\u1ebfu ch\u00fang ta c\u1ea7n th\u00eam s\u1ed1 \u0111i\u1ec7n tho\u1ea1i cho t\u1ea5t c\u1ea3 ng\u01b0\u1eddi d\u00f9ng, ch\u00fang ta ch\u1ec9 c\u1ea7n thay \u0111\u1ed5i l\u1edbp User<\/strong> l\u1edbp. C\u1ea3 hai l\u1edbp con \u0111\u1ec1u k\u1ebf th\u1eeba thay \u0111\u1ed5i n\u00e0y m\u1ed9t c\u00e1ch t\u1ef1 \u0111\u1ed9ng.<\/p>\n

                    T\u1ed5ng qu\u00e1t h\u00f3a \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n v\u00e0 m\u0169i t\u00ean tam gi\u00e1c r\u1ed7ng h\u01b0\u1edbng v\u1ec1 l\u1edbp cha. K\u00fd hi\u1ec7u n\u00e0y r\u00f5 r\u00e0ng truy\u1ec1n \u0111\u1ea1t m\u1ed1i quan h\u1ec7 \u201cl\u00e0 m\u1ed9t\u201d.<\/p>\n

                    \ud83d\udee1\ufe0f B\u01b0\u1edbc 5: Th\u00eam r\u00e0ng bu\u1ed9c v\u00e0 b\u1ed9i s\u1ed1<\/h2>\n

                    S\u01a1 \u0111\u1ed3 tr\u1ef1c quan r\u1ea5t m\u1ea1nh m\u1ebd, nh\u01b0ng ch\u00fang kh\u00f4ng th\u1ec3 bi\u1ec3u di\u1ec5n m\u1ecdi quy t\u1eafc. R\u00e0ng bu\u1ed9c cho ph\u00e9p ch\u00fang ta th\u00eam v\u0103n b\u1ea3n ho\u1eb7c logic v\u00e0o c\u00e1c ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a s\u01a1 \u0111\u1ed3. Ch\u00fang th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111\u00f3ng trong d\u1ea5u ngo\u1eb7c nh\u1ecdn {}<\/code>.<\/p>\n

                    \u0110\u1ed1i v\u1edbi H\u1ec7 th\u1ed1ng Th\u01b0 vi\u1ec7n, ch\u00fang ta c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00e1c r\u00e0ng bu\u1ed9c sau:<\/p>\n

                      \n
                    • Th\u1eddi gian m\u01b0\u1ee3n:<\/strong>M\u1ed9t l\u1ea7n m\u01b0\u1ee3n kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 30 ng\u00e0y. Ch\u00fang ta c\u00f3 th\u1ec3 ghi ch\u00fa \u0111i\u1ec1u n\u00e0y tr\u00ean M\u01b0\u1ee3n<\/strong> thu\u1ed9c t\u00ednh l\u1edbp ng\u00e0yDue<\/code>.<\/li>\n
                    • S\u00e1ch t\u1ed1i \u0111a:<\/strong> M\u1ed9t th\u00e0nh vi\u00ean kh\u00f4ng th\u1ec3 gi\u1eef h\u01a1n 5 kho\u1ea3n m\u01b0\u1ee3n \u0111ang ho\u1ea1t \u0111\u1ed9ng. \u0110\u00e2y l\u00e0 m\u1ed9t r\u00e0ng bu\u1ed9c \u0111\u1ed1i v\u1edbi m\u1ed1i quan h\u1ec7 gi\u1eefa Th\u00e0nh vi\u00ean v\u00e0 M\u01b0\u1ee3n.<\/li>\n
                    • Ph\u00ed ph\u1ea1t:<\/strong> N\u1ebfu m\u1ed9t cu\u1ed1n s\u00e1ch \u0111\u01b0\u1ee3c tr\u1ea3 tr\u1ec5, m\u1ed9t kho\u1ea3n ph\u00ed s\u1ebd \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n. Logic n\u00e0y thu\u1ed9c v\u1ec1 ph\u1ea7n M\u01b0\u1ee3n<\/strong> thao t\u00e1c l\u1edbp.<\/li>\n<\/ul>\n

                      B\u1eb1ng c\u00e1ch th\u00eam c\u00e1c ghi ch\u00fa n\u00e0y, s\u01a1 \u0111\u1ed3 tr\u1edf th\u00e0nh m\u1ed9t t\u00e0i li\u1ec7u t\u1ef1 gi\u1ea3i th\u00edch. N\u00f3 kh\u00f4ng ch\u1ec9 gi\u1ea3i th\u00edch c\u1ea5u tr\u00fac, m\u00e0 c\u00f2n gi\u1ea3i th\u00edch c\u00e1c quy t\u1eafc \u0111i\u1ec1u ch\u1ec9nh c\u1ea5u tr\u00fac.<\/p>\n

                      \u26a0\ufe0f Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong m\u00f4 h\u00ecnh h\u00f3a<\/h2>\n

                      Ngay c\u1ea3 nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf c\u00f3 kinh nghi\u1ec7m c\u0169ng g\u1eb7p ph\u1ea3i l\u1ed7i. Vi\u1ec7c nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn s\u1ebd gi\u00fap tr\u00e1nh \u0111\u01b0\u1ee3c c\u00f4ng vi\u1ec7c ph\u1ea3i l\u00e0m l\u1ea1i \u1edf giai \u0111o\u1ea1n sau c\u1ee7a chu tr\u00ecnh ph\u00e1t tri\u1ec3n.<\/p>\n

                      1. M\u00f4 h\u00ecnh h\u00f3a qu\u00e1 m\u1ee9c<\/strong><\/p>\n

                      T\u1ea1o l\u1edbp cho t\u1eebng m\u1ea3nh d\u1eef li\u1ec7u nh\u1ecf d\u1eabn \u0111\u1ebfn s\u01a1 \u0111\u1ed3 ph\u1ee9c t\u1ea1p v\u00e0 kh\u00f3 b\u1ea3o tr\u00ec. Ch\u1ec9 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c th\u1ef1c th\u1ec3 c\u00f3 h\u00e0nh vi ho\u1eb7c m\u1ed1i quan h\u1ec7 quan tr\u1ecdng. C\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u \u0111\u01a1n gi\u1ea3n n\u00ean n\u1eb1m trong thu\u1ed9c t\u00ednh.<\/p>\n

                      2. B\u1ecf qua v\u00f2ng \u0111\u1eddi<\/strong><\/p>\n

                      \u0110\u00f4i khi m\u1ed9t l\u1edbp ch\u1ec9 t\u1ed3n t\u1ea1i t\u1ea1m th\u1eddi. M\u1ed9t SearchQuery<\/strong> c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ea1o ra khi ng\u01b0\u1eddi d\u00f9ng t\u00ecm ki\u1ebfm nh\u01b0ng b\u1ecb h\u1ee7y ngay sau \u0111\u00f3. Nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ea1m th\u1eddi n\u00e0y c\u1ea7n \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a c\u1ea9n th\u1eadn, th\u01b0\u1eddng t\u00e1ch bi\u1ec7t kh\u1ecfi c\u00e1c l\u1edbp b\u1ec1n v\u1eefng ch\u00ednh.<\/p>\n

                      3. Ph\u1ee5 thu\u1ed9c v\u00f2ng<\/strong><\/p>\n

                      L\u1edbp A ph\u1ee5 thu\u1ed9c v\u00e0o L\u1edbp B, v\u00e0 L\u1edbp B ph\u1ee5 thu\u1ed9c v\u00e0o L\u1edbp A. M\u1eb7c d\u00f9 \u0111\u00f4i khi kh\u00f4ng th\u1ec3 tr\u00e1nh kh\u1ecfi, \u0111i\u1ec1u n\u00e0y t\u1ea1o ra s\u1ef1 li\u00ean k\u1ebft ch\u1eb7t ch\u1ebd. H\u00e3y c\u1ed1 g\u1eafng ph\u00e1 v\u1ee1 chu k\u1ef3 n\u00e0y b\u1eb1ng c\u00e1ch gi\u1edbi thi\u1ec7u m\u1ed9t giao di\u1ec7n ho\u1eb7c di chuy\u1ec3n logic chung sang m\u1ed9t l\u1edbp th\u1ee9 ba.<\/p>\n

                      4. C\u00e1c m\u1ed1i quan h\u1ec7 m\u01a1 h\u1ed3<\/strong><\/p>\n

                      S\u1eed d\u1ee5ng m\u1ed9t \u0111\u01b0\u1eddng chung chung m\u00e0 kh\u00f4ng c\u00f3 nh\u00e3n s\u1ebd khi\u1ebfn s\u01a1 \u0111\u1ed3 kh\u00f3 \u0111\u1ecdc. Lu\u00f4n \u0111\u1eb7t t\u00ean cho m\u1ed1i quan h\u1ec7 (v\u00ed d\u1ee5: \u201cM\u01b0\u1ee3n\u201d, \u201cQu\u1ea3n l\u00fd\u201d, \u201cCh\u1ee9a\u201d) \u0111\u1ec3 l\u00e0m r\u00f5 h\u01b0\u1edbng v\u00e0 \u00fd ngh\u0129a.<\/p>\n

                      \ud83e\uddea B\u01b0\u1edbc 6: X\u00e1c minh v\u00e0 tinh ch\u1ec9nh<\/h2>\n

                      Sau khi v\u1ebd s\u01a1 \u0111\u1ed3 ban \u0111\u1ea7u, n\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c x\u00e1c minh d\u1ef1a tr\u00ean c\u00e1c y\u00eau c\u1ea7u. S\u01a1 \u0111\u1ed3 c\u00f3 bao qu\u00e1t t\u1ea5t c\u1ea3 c\u00e1c quy t\u1eafc kinh doanh kh\u00f4ng? Ch\u00fang ta c\u00f3 th\u1ec3 truy xu\u1ea5t t\u1eebng t\u00ednh n\u0103ng tr\u1edf l\u1ea1i m\u1ed9t l\u1edbp ho\u1eb7c m\u1ed1i quan h\u1ec7 kh\u00f4ng?<\/p>\n

                      S\u1eed d\u1ee5ng danh s\u00e1ch ki\u1ec3m tra n\u00e0y \u0111\u1ec3 x\u00e1c minh c\u00f4ng vi\u1ec7c c\u1ee7a b\u1ea1n:<\/p>\n

                        \n
                      • T\u1ea5t c\u1ea3 c\u00e1c thu\u1ed9c t\u00ednh b\u1eaft bu\u1ed9c c\u00f3 m\u1eb7t ch\u01b0a?<\/li>\n
                      • S\u1ed1 l\u01b0\u1ee3ng cho m\u1ed7i m\u1ed1i quan h\u1ec7 c\u00f3 \u0111\u00fang kh\u00f4ng?<\/li>\n
                      • K\u1ebf th\u1eeba c\u00f3 h\u1ee3p l\u00fd kh\u00f4ng, hay ch\u00fang ta n\u00ean s\u1eed d\u1ee5ng k\u1ebft h\u1ee3p?<\/li>\n
                      • C\u00f3 l\u1edbp n\u00e0o b\u1ecb t\u00e1ch r\u1eddi, kh\u00f4ng k\u1ebft n\u1ed1i v\u1edbi ph\u1ea7n c\u00f2n l\u1ea1i c\u1ee7a h\u1ec7 th\u1ed1ng kh\u00f4ng?<\/li>\n
                      • Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean c\u00f3 nh\u1ea5t qu\u00e1n kh\u00f4ng (v\u00ed d\u1ee5: PascalCase cho c\u00e1c l\u1edbp)?<\/li>\n<\/ul>\n

                        Vi\u1ec7c tinh ch\u1ec9nh l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh l\u1eb7p l\u1ea1i. B\u1ea1n c\u00f3 th\u1ec3 c\u1ea7n di chuy\u1ec3n c\u00e1c l\u1edbp, \u0111\u1ed5i t\u00ean thu\u1ed9c t\u00ednh, ho\u1eb7c chia m\u1ed9t l\u1edbp th\u00e0nh hai l\u1edbp. \u0110i\u1ec1u n\u00e0y l\u00e0 b\u00ecnh th\u01b0\u1eddng v\u00e0 \u0111\u01b0\u1ee3c mong \u0111\u1ee3i trong giai \u0111o\u1ea1n thi\u1ebft k\u1ebf.<\/p>\n

                        \ud83d\udd04 K\u1ebft h\u1ee3p so v\u1edbi T\u00edch h\u1ee3p<\/h2>\n

                        Vi\u1ec7c ph\u00e2n bi\u1ec7t gi\u1eefa k\u1ebft h\u1ee3p v\u00e0 t\u00edch h\u1ee3p l\u00e0 m\u1ed9t \u0111i\u1ec3m th\u01b0\u1eddng g\u00e2y nh\u1ea7m l\u1eabn. C\u1ea3 hai \u0111\u1ec1u bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 \u201cc\u00f3-m\u1ed9t\u201d, nh\u01b0ng ch\u00fang kh\u00e1c nhau v\u1ec1 qu\u1ea3n l\u00fd v\u00f2ng \u0111\u1eddi.<\/p>\n

                        T\u00edch h\u1ee3p (H\u00ecnh thoi r\u1ed7ng):<\/strong> C\u00e1c b\u1ed9 ph\u1eadn c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n th\u1ec3. M\u1ed9t Ph\u00f2ng ban<\/strong> c\u00f3 Nh\u00e2n vi\u00ean<\/strong>. N\u1ebfu Ph\u00f2ng ban b\u1ecb gi\u1ea3i th\u1ec3, c\u00e1c Nh\u00e2n vi\u00ean v\u1eabn t\u1ed3n t\u1ea1i.<\/p>\n

                        Th\u00e0nh ph\u1ea7n (H\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y):<\/strong> C\u00e1c b\u1ed9 ph\u1eadn kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n th\u1ec3. M\u1ed9t Ng\u00f4i nh\u00e0<\/strong> c\u00f3 Ph\u00f2ng<\/strong>. N\u1ebfu ng\u00f4i nh\u00e0 b\u1ecb ph\u00e1 h\u1ee7y, c\u00e1c ph\u00f2ng s\u1ebd kh\u00f4ng c\u00f2n t\u1ed3n t\u1ea1i trong b\u1ed1i c\u1ea3nh \u0111\u00f3.<\/p>\n

                        Trong h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n c\u1ee7a ch\u00fang ta, h\u00e3y xem x\u00e9t S\u00e1ch<\/strong> v\u00e0 Trang<\/strong>. M\u1ed9t cu\u1ed1n s\u00e1ch \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh t\u1eeb c\u00e1c trang. N\u1ebfu cu\u1ed1n s\u00e1ch b\u1ecb ph\u00e1 h\u1ee7y, c\u00e1c trang c\u0169ng b\u1ecb ph\u00e1 h\u1ee7y. \u0110\u00e2y l\u00e0 m\u1ed1i quan h\u1ec7 th\u00e0nh ph\u1ea7n. Ng\u01b0\u1ee3c l\u1ea1i, m\u1ed9t Th\u01b0 vi\u1ec7n<\/strong> c\u00f3 K\u1ec7 s\u00e1ch<\/strong>. C\u00e1c k\u1ec7 s\u00e1ch v\u1ec1 l\u00fd thuy\u1ebft c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c di chuy\u1ec3n sang m\u1ed9t t\u00f2a nh\u00e0 kh\u00e1c, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed1i quan h\u1ec7 t\u00edch h\u1ee3p.<\/p>\n

                        \ud83d\udcca T\u00f3m t\u1eaft c\u00e1c m\u1ed1i quan h\u1ec7 l\u1edbp<\/h2>\n

                        \u0110\u1ec3 h\u1ed7 tr\u1ee3 m\u00f4 h\u00ecnh h\u00f3a c\u1ee7a b\u1ea1n, d\u01b0\u1edbi \u0111\u00e2y l\u00e0 t\u00f3m t\u1eaft c\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn nh\u1ea5t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong t\u00ecnh hu\u1ed1ng n\u00e0y:<\/p>\n\n\n\n\n\n\n\n\n
                        Lo\u1ea1i m\u1ed1i quan h\u1ec7<\/th>\nK\u00fd hi\u1ec7u<\/th>\n\u00dd ngh\u0129a<\/th>\nV\u00ed d\u1ee5<\/th>\n<\/tr>\n<\/thead>\n
                        Li\u00ean k\u1ebft<\/td>\n\u0110\u01b0\u1eddng th\u1eb3ng<\/td>\nLi\u00ean k\u1ebft t\u1ed5ng qu\u00e1t gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\nTh\u00e0nh vi\u00ean \u2013 Vay m\u01b0\u1ee3n<\/td>\n<\/tr>\n
                        T\u1ed5ng h\u1ee3p<\/td>\nH\u00ecnh thoi r\u1ed7ng<\/td>\nTo\u00e0n th\u1ec3 \u2013 B\u1ed9 ph\u1eadn (\u0110\u1ed9c l\u1eadp)<\/td>\nTh\u01b0 vi\u1ec7n \u2013 K\u1ec7 s\u00e1ch<\/td>\n<\/tr>\n
                        Th\u00e0nh ph\u1ea7n<\/td>\nH\u00ecnh thoi \u0111\u1ea7y<\/td>\nTo\u00e0n th\u1ec3 \u2013 B\u1ed9 ph\u1eadn (Ph\u1ee5 thu\u1ed9c)<\/td>\nS\u00e1ch \u2013 Trang s\u00e1ch<\/td>\n<\/tr>\n
                        K\u1ebf th\u1eeba<\/td>\nM\u0169i t\u00ean tam gi\u00e1c<\/td>\nM\u1ed1i quan h\u1ec7 L\u00e0-M\u1ed9t<\/td>\nTh\u00e0nh vi\u00ean \u2013 Ng\u01b0\u1eddi d\u00f9ng<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

                        \ud83d\ude80 Ti\u1ebfn b\u01b0\u1edbc v\u1ec1 ph\u00eda tr\u01b0\u1edbc<\/h2>\n

                        M\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1ed1t s\u1ebd gi\u1ea3m thi\u1ec3u s\u1ef1 m\u01a1 h\u1ed3 v\u00e0 \u0111\u00f3ng vai tr\u00f2 l\u00e0 h\u01b0\u1edbng d\u1eabn \u0111\u00e1ng tin c\u1eady cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n. N\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng ph\u1ea7n m\u1ec1m cu\u1ed1i c\u00f9ng ph\u00f9 h\u1ee3p v\u1edbi ki\u1ebfn tr\u00fac \u0111\u01b0\u1ee3c \u0111\u1ecbnh h\u01b0\u1edbng. B\u1eb1ng c\u00e1ch tu\u00e2n theo c\u00e1c b\u01b0\u1edbc \u0111\u01b0\u1ee3c n\u00eau trong h\u01b0\u1edbng d\u1eabn n\u00e0y, b\u1ea1n c\u00f3 th\u1ec3 t\u1ea1o ra c\u00e1c m\u00f4 h\u00ecnh v\u1eeba ch\u00ednh x\u00e1c v\u1ec1 m\u1eb7t k\u1ef9 thu\u1eadt v\u1eeba d\u1ec5 hi\u1ec3u.<\/p>\n

                        H\u00e3y nh\u1edb r\u1eb1ng m\u00f4 h\u00ecnh h\u00f3a l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n qua th\u1ef1c h\u00e0nh. B\u1eaft \u0111\u1ea7u v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u01a1n gi\u1ea3n nh\u01b0 v\u00ed d\u1ee5 th\u01b0 vi\u1ec7n, v\u00e0 d\u1ea7n d\u1ea7n x\u1eed l\u00fd c\u00e1c l\u0129nh v\u1ef1c ph\u1ee9c t\u1ea1p h\u01a1n. T\u1eadp trung v\u00e0o s\u1ef1 r\u00f5 r\u00e0ng thay v\u00ec \u0111\u1ed9 ph\u1ee9c t\u1ea1p. M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u01a1n gi\u1ea3n nh\u01b0ng hi\u1ec7u qu\u1ea3 t\u1ed1t h\u01a1n m\u1ed9t s\u01a1 \u0111\u1ed3 ph\u1ee9c t\u1ea1p khi\u1ebfn c\u1ea3 \u0111\u1ed9i b\u1ecb nh\u1ea7m l\u1eabn.<\/p>\n

                        Gi\u1eef cho s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt khi y\u00eau c\u1ea7u thay \u0111\u1ed5i. Thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m l\u00e0 \u0111\u1ed9ng, v\u00e0 t\u00e0i li\u1ec7u c\u1ee7a b\u1ea1n n\u00ean ph\u1ea3n \u00e1nh th\u1ef1c t\u1ebf \u0111\u00f3. S\u1eed d\u1ee5ng c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng b\u1ec1n v\u1eefng, m\u1edf r\u1ed9ng \u0111\u01b0\u1ee3c v\u00e0 d\u1ec5 b\u1ea3o tr\u00ec.<\/p>\n","protected":false},"excerpt":{"rendered":"

                        Thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m b\u1eaft \u0111\u1ea7u tr\u01b0\u1edbc khi vi\u1ebft b\u1ea5t k\u1ef3 d\u00f2ng m\u00e3 n\u00e0o. N\u00f3 b\u1eaft \u0111\u1ea7u b\u1eb1ng vi\u1ec7c hi\u1ec3u kh\u00f4ng gian v\u1ea5n \u0111\u1ec1 v\u00e0 t\u1ed5 ch\u1ee9c th\u00f4ng tin th\u00e0nh…<\/p>\n","protected":false},"author":1,"featured_media":1460,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"Nghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p th\u1ef1c t\u1ebf: M\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n b\u1eb1ng s\u01a1 \u0111\u1ed3 l\u1edbp","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n b\u1eb1ng c\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp r\u00f5 r\u00e0ng. H\u01b0\u1edbng d\u1eabn t\u1eebng b\u01b0\u1edbc v\u1ec1 m\u00f4 h\u00ecnh h\u00f3a UML, c\u00e1c m\u1ed1i quan h\u1ec7 v\u00e0 c\u00e1c nguy\u00ean t\u1eafc thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[13],"tags":[43,45],"class_list":["post-1459","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uml","tag-academic","tag-class-diagram"],"yoast_head":"\nNghi\u00ean c\u1ee9u tr\u01b0\u1eddng h\u1ee3p th\u1ef1c t\u1ebf: M\u00f4 h\u00ecnh h\u00f3a h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n b\u1eb1ng s\u01a1 \u0111\u1ed3 l\u1edbp<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0 vi\u1ec7n b\u1eb1ng c\u00e1c s\u01a1 \u0111\u1ed3 l\u1edbp r\u00f5 r\u00e0ng. 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