{"id":1529,"date":"2026-03-28T19:48:18","date_gmt":"2026-03-28T19:48:18","guid":{"rendered":"https:\/\/www.viz-read.com\/vi\/object-diagrams-for-beginners-tutorial\/"},"modified":"2026-03-28T19:48:18","modified_gmt":"2026-03-28T19:48:18","slug":"object-diagrams-for-beginners-tutorial","status":"publish","type":"post","link":"https:\/\/www.viz-read.com\/vi\/object-diagrams-for-beginners-tutorial\/","title":{"rendered":"S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u: H\u01b0\u1edbng d\u1eabn r\u00f5 r\u00e0ng, t\u1eebng b\u01b0\u1edbc b\u1ea1n c\u00f3 th\u1ec3 theo d\u00f5i"},"content":{"rendered":"

Ch\u00e0o m\u1eebng b\u1ea1n \u0111\u1ebfn v\u1edbi th\u1ebf gi\u1edbi m\u00f4 h\u00ecnh h\u00f3a ph\u1ea7n m\u1ec1m. N\u1ebfu b\u1ea1n t\u1eebng nh\u00ecn v\u00e0o m\u1ed9t h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p v\u00e0 t\u1ef1 h\u1ecfi l\u00e0m th\u1ebf n\u00e0o c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c nhau k\u1ebft n\u1ed1i v\u1edbi nhau theo th\u1eddi gian th\u1ef1c, th\u00ec b\u1ea1n \u0111ang suy ngh\u0129 nh\u01b0 m\u1ed9t nh\u00e0 m\u00f4 h\u00ecnh h\u00f3a.S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng<\/strong>l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd trong kho v\u0169 kh\u00ed c\u1ee7a Ng\u00f4n ng\u1eef M\u00f4 h\u00ecnh h\u00f3a \u0110\u01a1n nh\u1ea5t (UML). Ch\u00fang cung c\u1ea5p m\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p nhanh v\u1ec1 h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf d\u00e0nh cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u mu\u1ed1n hi\u1ec3u v\u1ec1 c\u01a1 ch\u1ebf c\u1ee7a S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng m\u00e0 kh\u00f4ng b\u1ecb l\u1ea1c trong c\u00e1c thu\u1eadt ng\u1eef chuy\u00ean m\u00f4n. Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 l\u00fd thuy\u1ebft, k\u00fd hi\u1ec7u, c\u00e1c b\u01b0\u1edbc th\u1ef1c h\u00e0nh v\u00e0 c\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t. Kh\u00f4ng c\u00f3 nh\u1eefng l\u1eddi hoa m\u1ef9 qu\u1ea3ng c\u00e1o, ch\u1ec9 c\u00f3 ki\u1ebfn th\u1ee9c k\u1ef9 thu\u1eadt r\u00f5 r\u00e0ng.<\/p>\n

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

S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng l\u00e0 g\u00ec? \ud83d\udcca<\/h2>\n

S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t s\u01a1 \u0111\u1ed3 c\u1ea5u tr\u00fac t\u0129nh. N\u00f3 m\u00f4 t\u1ea3 c\u1ea5u tr\u00fac c\u1ee7a h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 c\u1ee7a ch\u00fang t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. 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, th\u00ec S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng cho th\u1ea5y c\u00e1c kh\u1ed1i x\u00e2y d\u1ef1ng th\u1ef1c t\u1ebf \u0111ang \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/p>\n

H\u00e3y h\u00ecnh dung S\u01a1 \u0111\u1ed3 L\u1edbp nh\u01b0 m\u1ed9t c\u00f4ng th\u1ee9c n\u1ea5u \u0103n. N\u00f3 n\u00f3i cho b\u1ea1n bi\u1ebft b\u1ea1n c\u1ea7n nh\u1eefng nguy\u00ean li\u1ec7u g\u00ec v\u00e0 t\u1ef7 l\u1ec7 bao nhi\u00eau. S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng l\u00e0 chi\u1ebfc b\u00e1nh th\u1ef1c s\u1ef1 tr\u00ean \u0111\u0129a. N\u00f3 th\u1ec3 hi\u1ec7n tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 c\u1ee7a d\u1eef li\u1ec7u.<\/p>\n

Nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh bao g\u1ed3m:<\/strong><\/p>\n

    \n
  • Ch\u1ebf \u0111\u1ed9 xem \u1ea3nh ch\u1ee5p nhanh:<\/strong>N\u00f3 \u0111\u1ea1i di\u1ec7n cho m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n
  • C\u1ea5u tr\u00fac t\u0129nh:<\/strong>N\u00f3 kh\u00f4ng th\u1ec3 hi\u1ec7n h\u00e0nh vi hay lu\u1ed3ng, ch\u1ec9 c\u00f3 c\u00e1c m\u1ed1i quan h\u1ec7.<\/li>\n
  • Th\u1ef1c hi\u1ec7n:<\/strong>N\u00f3 gi\u00fap h\u00ecnh dung c\u00e1ch m\u00e3 ngu\u1ed3n s\u1ebd tr\u00f4ng nh\u01b0 th\u1ebf n\u00e0o khi \u0111ang ch\u1ea1y.<\/li>\n
  • X\u00e1c minh:<\/strong>N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 x\u00e1c minh xem thi\u1ebft k\u1ebf c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi logic mong mu\u1ed1n hay kh\u00f4ng.<\/li>\n<\/ul>\n

    C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i c\u1ee7a S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng \ud83e\udde9<\/h2>\n

    \u0110\u1ec3 t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 h\u1ee3p l\u1ec7, b\u1ea1n ph\u1ea3i hi\u1ec3u r\u00f5 c\u00e1c th\u00e0nh ph\u1ea7n c\u01a1 b\u1ea3n. M\u1ed7i th\u00e0nh ph\u1ea7n \u0111\u1ec1u c\u00f3 m\u1ed9t bi\u1ec3u di\u1ec5n tr\u1ef1c quan c\u1ee5 th\u1ec3 v\u00e0 m\u1ed9t \u0111\u1ecbnh ngh\u0129a k\u1ef9 thu\u1eadt.<\/p>\n

    1. \u0110\u1ed1i t\u01b0\u1ee3ng (Th\u1ec3 hi\u1ec7n)<\/h3>\n

    M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 c\u1ee7a m\u1ed9t l\u1edbp. Trong s\u01a1 \u0111\u1ed3, m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt. H\u00ecnh ch\u1eef nh\u1eadt n\u00e0y \u0111\u01b0\u1ee3c chia th\u00e0nh ba ph\u1ea7n:<\/p>\n

      \n
    • Ph\u1ea7n tr\u00ean:<\/strong>Ch\u1ee9a t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c in nghi\u00eang \u0111\u1ec3 ph\u00e2n bi\u1ec7t v\u1edbi t\u00ean l\u1edbp.<\/li>\n
    • Ph\u1ea7n gi\u1eefa:<\/strong>Ch\u1ee9a t\u00ean lo\u1ea1i ho\u1eb7c t\u00ean l\u1edbp, \u0111i tr\u01b0\u1edbc b\u1edfi d\u1ea5u hai ch\u1ea5m. V\u00ed d\u1ee5:Ng\u01b0\u1eddi d\u00f9ng:Kh\u00e1ch h\u00e0ng<\/code>.<\/li>\n
    • Ph\u1ea7n d\u01b0\u1edbi:<\/strong>Ch\u1ee9a c\u00e1c gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh. \u0110\u00e2y l\u00e0 n\u01a1i d\u1eef li\u1ec7u th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef.<\/li>\n<\/ul>\n

      2. Li\u00ean k\u1ebft (M\u1ed1i quan h\u1ec7)<\/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. M\u1ed9t li\u00ean k\u1ebft l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng n\u1ed1i hai \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110\u00e2y l\u00e0 phi\u00ean b\u1ea3n th\u1eddi gian ch\u1ea1y c\u1ee7a m\u1ed9t m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a trong s\u01a1 \u0111\u1ed3 l\u1edbp.<\/p>\n

        \n
      • H\u01b0\u1edbng:<\/strong>C\u00e1c m\u0169i t\u00ean ch\u1ec9 ra kh\u1ea3 n\u0103ng \u0111\u1ecbnh h\u01b0\u1edbng.<\/li>\n
      • \u0110a d\u1ea1ng:<\/strong>C\u00e1c nh\u00e3n tr\u00ean \u0111\u01b0\u1eddng n\u1ed1i cho th\u1ea5y c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i bao nhi\u00eau \u0111\u1ed1i t\u01b0\u1ee3ng (v\u00ed d\u1ee5: 1, 0..1, *).<\/li>\n<\/ul>\n

        3. Vai tr\u00f2<\/h3>\n

        Khi hai \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft, ch\u00fang th\u01b0\u1eddng \u0111\u00f3ng vai tr\u00f2 c\u1ee5 th\u1ec3. T\u00ean vai tr\u00f2 \u0111\u01b0\u1ee3c \u0111\u1eb7t g\u1ea7n cu\u1ed1i \u0111\u01b0\u1eddng n\u1ed1i. \u0110i\u1ec1u n\u00e0y l\u00e0m r\u00f5 m\u1ed1i quan h\u1ec7.<\/p>\n

        4. T\u00edch h\u1ee3p v\u00e0 K\u1ebft h\u1ee3p<\/h3>\n

        \u0110\u00e2y l\u00e0 nh\u1eefng lo\u1ea1i li\u00ean k\u1ebft \u0111\u1eb7c bi\u1ec7t bi\u1ec3u di\u1ec5n m\u1ed1i quan h\u1ec7 ‘thu\u1ed9c v\u1ec1’.<\/p>\n

          \n
        • T\u00edch h\u1ee3p (H\u00ecnh thoi):<\/strong>M\u1ed1i quan h\u1ec7 y\u1ebfu. N\u1ebfu to\u00e0n b\u1ed9 b\u1ecb h\u1ee7y, c\u00e1c b\u1ed9 ph\u1eadn v\u1eabn c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i.<\/li>\n
        • K\u1ebft h\u1ee3p (H\u00ecnh thoi \u0111\u1ea7y):<\/strong>M\u1ed1i quan h\u1ec7 m\u1ea1nh. N\u1ebfu to\u00e0n b\u1ed9 b\u1ecb h\u1ee7y, c\u00e1c b\u1ed9 ph\u1eadn c\u0169ng b\u1ecb h\u1ee7y.<\/li>\n<\/ul>\n

          S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng so v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp \u2696\ufe0f<\/h2>\n

          Ng\u01b0\u1eddi m\u1edbi th\u01b0\u1eddng nh\u1ea7m l\u1eabn hai lo\u1ea1i n\u00e0y. Hi\u1ec3u \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c bi\u1ec7t l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng so s\u00e1nh \u0111\u1ec3 l\u00e0m r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t.<\/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>\nB\u1ea3n v\u1ebd \/ M\u1eabu<\/td>\nTh\u1ec3 hi\u1ec7n \/ B\u1ee9c \u1ea3nh th\u1eddi \u0111i\u1ec3m<\/td>\n<\/tr>\n
          N\u1ed9i dung<\/strong><\/td>\nL\u1edbp, Thu\u1ed9c t\u00ednh, Ph\u01b0\u01a1ng th\u1ee9c<\/td>\n\u0110\u1ed1i t\u01b0\u1ee3ng, Gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh<\/td>\n<\/tr>\n
          Th\u1eddi gian<\/strong><\/td>\nV\u0129nh vi\u1ec5n (Thi\u1ebft k\u1ebf)<\/td>\nTh\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3 (Th\u1eddi \u0111i\u1ec3m ch\u1ea1y)<\/td>\n<\/tr>\n
          V\u00ed d\u1ee5<\/strong><\/td>\nL\u1edbp: Xe h\u01a1i<\/code><\/td>\n\u0110\u1ed1i t\u01b0\u1ee3ng: myCar: Xe h\u01a1i<\/code> (\u0110\u1ecf, M\u1eabu X)<\/td>\n<\/tr>\n
          S\u1eed d\u1ee5ng<\/strong><\/td>\nThi\u1ebft k\u1ebf c\u01a1 s\u1edf d\u1eef li\u1ec7u, C\u1ea5u tr\u00fac m\u00e3 ngu\u1ed3n<\/td>\nKi\u1ec3m th\u1eed, G\u1ee1 l\u1ed7i, T\u00e0i li\u1ec7u<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          B\u01b0\u1edbc t\u1eebng b\u01b0\u1edbc: T\u1ea1o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \ud83d\udee0\ufe0f<\/h2>\n

          B\u00e2y gi\u1edd khi ch\u00fang ta \u0111\u00e3 hi\u1ec3u l\u00fd thuy\u1ebft, h\u00e3y c\u00f9ng \u0111i qua quy tr\u00ecnh t\u1ea1o m\u1ed9t s\u01a1 \u0111\u1ed3. L\u00e0m theo c\u00e1c b\u01b0\u1edbc n\u00e0y \u0111\u1ec3 x\u00e2y d\u1ef1ng m\u1ed9t s\u01a1 \u0111\u1ed3 r\u00f5 r\u00e0ng.<\/p>\n

          B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh ph\u1ea1m vi h\u1ec7 th\u1ed1ng<\/h3>\n

          Quy\u1ebft \u0111\u1ecbnh ph\u1ea7n n\u00e0o c\u1ee7a h\u1ec7 th\u1ed1ng b\u1ea1n \u0111ang m\u00f4 h\u00ecnh h\u00f3a. \u0110\u1eebng c\u1ed1 g\u1eafng m\u00f4 h\u00ecnh h\u00f3a to\u00e0n b\u1ed9 \u1ee9ng d\u1ee5ng trong m\u1ed9t s\u01a1 \u0111\u1ed3. T\u1eadp trung v\u00e0o m\u1ed9t tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ho\u1eb7c t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3. V\u00ed d\u1ee5: \u201cX\u1eed l\u00fd \u0111\u01a1n h\u00e0ng\u201d ho\u1eb7c \u201c\u0110\u0103ng nh\u1eadp ng\u01b0\u1eddi d\u00f9ng\u201d.<\/p>\n

          B\u01b0\u1edbc 2: Ch\u1ecdn c\u00e1c l\u1edbp li\u00ean quan<\/h3>\n

          H\u00e3y xem s\u01a1 \u0111\u1ed3 L\u1edbp c\u1ee7a b\u1ea1n. X\u00e1c \u0111\u1ecbnh c\u00e1c l\u1edbp tham gia v\u00e0o t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3 c\u1ee7a b\u1ea1n. N\u1ebfu b\u1ea1n \u0111ang m\u00f4 h\u00ecnh h\u00f3a m\u1ed9t \u0111\u01a1n h\u00e0ng, b\u1ea1n c\u00f3 l\u1ebd c\u1ea7nKh\u00e1ch h\u00e0ng<\/code>, \u0110\u01a1n h\u00e0ng<\/code>, v\u00e0 S\u1ea3n ph\u1ea9m<\/code> c\u00e1c l\u1edbp.<\/p>\n

          B\u01b0\u1edbc 3: T\u1ea1o c\u00e1c th\u1ec3 hi\u1ec7n \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

          V\u1edbi m\u1ed7i l\u1edbp \u0111\u00e3 ch\u1ecdn, h\u00e3y t\u1ea1o \u00edt nh\u1ea5t m\u1ed9t th\u1ec3 hi\u1ec7n \u0111\u1ed1i t\u01b0\u1ee3ng. \u0110\u1eb7t t\u00ean ch\u00fang m\u1ed9t c\u00e1ch duy nh\u1ea5t. \u0110\u1eebng d\u00f9ng t\u00ean chung chung nh\u01b0 \u201cObject1\u201d. H\u00e3y d\u00f9ng t\u00ean ph\u1ea3n \u00e1nh d\u1eef li\u1ec7u, v\u00ed d\u1ee5 nh\u01b0cust1<\/code> ho\u1eb7c orderA<\/code>.<\/p>\n

          B\u01b0\u1edbc 4: X\u00e1c \u0111\u1ecbnh gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh<\/h3>\n

          \u0110i\u1ec1n v\u00e0o ph\u1ea7n d\u01b0\u1edbi c\u00f9ng c\u1ee7a c\u00e1c h\u00ecnh ch\u1eef nh\u1eadt \u0111\u1ed1i t\u01b0\u1ee3ng. G\u00e1n c\u00e1c gi\u00e1 tr\u1ecb c\u1ee5 th\u1ec3. N\u1ebfu m\u1ed9t l\u1edbp c\u00f3 thu\u1ed9c t\u00ednhtr\u1ea1ng th\u00e1i<\/code>, th\u00ec \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 c\u00f3tr\u1ea1ng th\u00e1i: \"\u0110ang ch\u1edd\"<\/code>. \u0110\u00e2y ch\u00ednh l\u00e0 \u0111i\u1ec1u l\u00e0m cho s\u01a1 \u0111\u1ed3 tr\u1edf th\u00e0nh m\u1ed9t s\u01a1 \u0111\u1ed3 \u201c\u0111\u1ed1i t\u01b0\u1ee3ng\u201d.<\/p>\n

          B\u01b0\u1edbc 5: V\u1ebd c\u00e1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

          K\u1ebft n\u1ed1i c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng d\u1ef1a tr\u00ean c\u00e1c m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong s\u01a1 \u0111\u1ed3 L\u1edbp c\u1ee7a b\u1ea1n. \u0110\u1ea3m b\u1ea3o tu\u00e2n th\u1ee7 t\u00ednh \u0111a d\u1ea1ng. N\u1ebfu m\u1ed9t Kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u \u0110\u01a1n h\u00e0ng, h\u00e3y v\u1ebd nhi\u1ec1u li\u00ean k\u1ebft ho\u1eb7c r\u00f5 r\u00e0ng ch\u1ec9 ra t\u00ednh \u0111a d\u1ea1ng.<\/p>\n

          B\u01b0\u1edbc 6: Th\u00eam vai tr\u00f2 v\u00e0 t\u00ednh \u0111a d\u1ea1ng<\/h3>\n

          \u0110\u1eb7t nh\u00e3n cho c\u00e1c li\u00ean k\u1ebft c\u1ee7a b\u1ea1n. Th\u00eam t\u00ednh \u0111a d\u1ea1ng \u1edf cu\u1ed1i \u0111\u01b0\u1eddng n\u1ed1i. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o b\u1ea5t k\u1ef3 ai \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ec1u bi\u1ebft \u0111\u01b0\u1ee3c c\u1ea5p \u0111\u1ed9 quan h\u1ec7.<\/p>\n

          V\u00ed d\u1ee5 th\u1ef1c t\u1ebf: M\u1ed9t c\u1eeda h\u00e0ng tr\u1ef1c tuy\u1ebfn \ud83d\uded2<\/h2>\n

          H\u00e3y \u00e1p d\u1ee5ng \u0111i\u1ec1u n\u00e0y v\u00e0o m\u1ed9t t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3. H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t h\u1ec7 th\u1ed1ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed \u0111\u01a1n gi\u1ea3n. Ch\u00fang ta mu\u1ed1n tr\u1ef1c quan h\u00f3a m\u1ed9t giao d\u1ecbch duy nh\u1ea5t.<\/p>\n

          C\u00e1c l\u1edbp tham gia:<\/strong><\/p>\n

            \n
          • Ng\u01b0\u1eddi d\u00f9ng<\/code><\/li>\n
          • Gi\u1ecf h\u00e0ng<\/code><\/li>\n
          • \u0110\u01a1n h\u00e0ng<\/code><\/li>\n
          • S\u1ea3n ph\u1ea9m<\/code><\/li>\n<\/ul>\n

            T\u00ecnh hu\u1ed1ng:<\/strong>Alice \u0111\u0103ng nh\u1eadp, th\u00eam m\u1ed9t Laptop v\u00e0 m\u1ed9t Chu\u1ed9t v\u00e0o gi\u1ecf h\u00e0ng c\u1ee7a c\u00f4 \u1ea5y, v\u00e0 \u0111\u1eb7t m\u1ed9t \u0111\u01a1n h\u00e0ng.<\/p>\n

            M\u00f4 t\u1ea3 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong><\/p>\n

              \n
            • \u0110\u1ed1i t\u01b0\u1ee3ng Ng\u01b0\u1eddi d\u00f9ng:<\/strong> T\u00ean: alice:Ng\u01b0\u1eddi d\u00f9ng<\/code>. Thu\u1ed9c t\u00ednh: email: \"alice@example.com\"<\/code>, id: 101<\/code>.<\/li>\n
            • \u0110\u1ed1i t\u01b0\u1ee3ng Gi\u1ecf h\u00e0ng:<\/strong> T\u00ean: cart1:Gi\u1ecf h\u00e0ng<\/code>. Thu\u1ed9c t\u00ednh: s\u1ed1 l\u01b0\u1ee3ng s\u1ea3n ph\u1ea9m: 2<\/code>, t\u1ed5ng c\u1ed9ng: 1500<\/code>.<\/li>\n
            • \u0110\u1ed1i t\u01b0\u1ee3ng \u0110\u01a1n h\u00e0ng:<\/strong> T\u00ean: ord55:\u0110\u01a1n h\u00e0ng<\/code>. Thu\u1ed9c t\u00ednh: ng\u00e0y: \"2023-10-25\"<\/code>, tr\u1ea1ng th\u00e1i: \"\u0110\u00e3 g\u1eedi\"<\/code>.<\/li>\n
            • \u0110\u1ed1i t\u01b0\u1ee3ng S\u1ea3n ph\u1ea9m:<\/strong> laptop:S\u1ea3n ph\u1ea9m<\/code> (Gi\u00e1: 1000), chu\u1ed9t:S\u1ea3n ph\u1ea9m<\/code> (Gi\u00e1: 500).<\/li>\n<\/ul>\n

              M\u1ed1i quan h\u1ec7:<\/strong><\/p>\n

                \n
              • alice \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi gi\u1ecf h\u00e0ng1.<\/li>\n
              • gi\u1ecf h\u00e0ng1 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi ord55.<\/li>\n
              • ord55 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi laptop v\u00e0 chu\u1ed9t.<\/li>\n<\/ul>\n

                Khi n\u00e0o n\u00ean s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng \ud83d\udcc5<\/h2>\n

                B\u1ea1n kh\u00f4ng c\u1ea7n s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng cho m\u1ecdi d\u1ef1 \u00e1n. S\u1eed d\u1ee5ng ch\u00fang m\u1ed9t c\u00e1ch chi\u1ebfn l\u01b0\u1ee3c khi ch\u00fang mang l\u1ea1i gi\u00e1 tr\u1ecb.<\/p>\n

                  \n
                • X\u00e1c minh l\u01b0\u1ee3c \u0111\u1ed3 C\u01a1 s\u1edf d\u1eef li\u1ec7u:<\/strong> Tr\u01b0\u1edbc khi vi\u1ebft SQL, h\u00e3y s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ec3 ki\u1ec3m tra xem c\u00e1c m\u1ed1i quan h\u1ec7 d\u1eef li\u1ec7u c\u00f3 h\u1ee3p l\u00fd hay kh\u00f4ng.<\/li>\n
                • C\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p:<\/strong> Khi s\u01a1 \u0111\u1ed3 L\u1edbp tr\u1edf n\u00ean qu\u00e1 r\u1ed1i r\u1eafm v\u1edbi c\u00e1c \u0111\u01b0\u1eddng d\u1eabn \u0111i\u1ec1u h\u01b0\u1edbng, s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 l\u00e0m r\u00f5 m\u1ed9t \u0111\u01b0\u1eddng d\u1eabn c\u1ee5 th\u1ec3.<\/li>\n
                • C\u00e1c t\u00ecnh hu\u1ed1ng Ki\u1ec3m th\u1eed:<\/strong> C\u00e1c nh\u00e0 ki\u1ec3m th\u1eed s\u1eed d\u1ee5ng ch\u00fang \u0111\u1ec3 hi\u1ec3u tr\u1ea1ng th\u00e1i d\u1eef li\u1ec7u mong \u0111\u1ee3i trong m\u1ed9t tr\u01b0\u1eddng h\u1ee3p ki\u1ec3m th\u1eed.<\/li>\n
                • Ph\u00e2n t\u00edch H\u1ec7 th\u1ed1ng C\u0169:<\/strong> Khi ph\u00e2n t\u00edch ng\u01b0\u1ee3c m\u00e3 ngu\u1ed3n, s\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng gi\u00fap x\u00e1c \u0111\u1ecbnh c\u00e1c tr\u1ea1ng th\u00e1i d\u1eef li\u1ec7u hi\u1ec7n c\u00f3.<\/li>\n<\/ul>\n

                  C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho M\u00f4 h\u00ecnh h\u00f3a r\u00f5 r\u00e0ng \ud83d\udcdd<\/h2>\n

                  Tu\u00e2n th\u1ee7 c\u00e1c quy \u01b0\u1edbc \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n d\u1ec5 \u0111\u1ecdc \u0111\u1ed1i v\u1edbi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 c\u00e1c b\u00ean li\u00ean quan kh\u00e1c.<\/p>\n

                  1. Quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean<\/h3>\n

                  S\u1eed d\u1ee5ng phong c\u00e1ch \u0111\u1eb7t t\u00ean nh\u1ea5t qu\u00e1n. M\u1ed9t quy \u01b0\u1edbc ph\u1ed5 bi\u1ebfn l\u00e0 ch\u1eef th\u01b0\u1eddng:ClassName<\/code>. V\u00ed d\u1ee5, user1:User<\/code>. \u0110i\u1ec1u n\u00e0y ngay l\u1eadp t\u1ee9c cho ng\u01b0\u1eddi \u0111\u1ecdc bi\u1ebft r\u1eb1ng user1<\/code> l\u00e0 m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp User<\/code> l\u1edbp.<\/p>\n

                  2. \u0110\u01a1n gi\u1ea3n h\u00f3a<\/h3>\n

                  Tr\u00e1nh l\u00e0m r\u1ed1i diagram b\u1eb1ng qu\u00e1 nhi\u1ec1u \u0111\u1ed1i t\u01b0\u1ee3ng. N\u1ebfu b\u1ea1n c\u00f3 50 \u0111\u01a1n h\u00e0ng, \u0111\u1eebng v\u1ebd 50 h\u00ecnh ch\u1eef nh\u1eadt. H\u00e3y v\u1ebd m\u1ed9t m\u1eabu \u0111\u1ea1i di\u1ec7n (v\u00ed d\u1ee5: 3 \u0111\u1ebfn 5) \u0111\u1ec3 minh h\u1ecda m\u1ed1i quan h\u1ec7.<\/p>\n

                  3. \u0110a d\u1ea1ng nh\u1ea5t qu\u00e1n<\/h3>\n

                  \u0110\u1ea3m b\u1ea3o \u0111a d\u1ea1ng tr\u00ean li\u00ean k\u1ebft ph\u00f9 h\u1ee3p v\u1edbi quy t\u1eafc kinh doanh. N\u1ebfu m\u1ed9t quy t\u1eafc n\u00eau r\u1eb1ng \u201cM\u1ed9t \u0111\u01a1n h\u00e0ng c\u00f3 m\u1ed9t kh\u00e1ch h\u00e0ng\u201d, \u0111\u1eebng v\u1ebd li\u00ean k\u1ebft nhi\u1ec1u-nhi\u1ec1u.<\/p>\n

                  4. M\u00e0u s\u1eafc v\u00e0 h\u00ecnh d\u1ea1ng<\/h3>\n

                  M\u1eb7c d\u00f9 ch\u00fang ta kh\u00f4ng s\u1eed d\u1ee5ng c\u00e1c ki\u1ec3u CSS \u1edf \u0111\u00e2y, nh\u01b0ng trong c\u00f4ng c\u1ee5 v\u1ebd, b\u1ea1n c\u00f3 th\u1ec3 d\u00f9ng m\u00e0u s\u1eafc \u0111\u1ec3 bi\u1ec3u th\u1ecb tr\u1ea1ng th\u00e1i. V\u00ed d\u1ee5, m\u00e0u \u0111\u1ecf cho l\u1ed7i, m\u00e0u xanh l\u00e1 cho th\u00e0nh c\u00f4ng. H\u00e3y gi\u1eef s\u1ef1 nh\u1ea5t qu\u00e1n n\u00e0y tr\u00ean t\u1ea5t c\u1ea3 c\u00e1c s\u01a1 \u0111\u1ed3.<\/p>\n

                  5. C\u1eadp nh\u1eadt th\u01b0\u1eddng xuy\u00ean<\/h3>\n

                  S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea1i di\u1ec7n cho m\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p. N\u1ebfu d\u1eef li\u1ec7u thay \u0111\u1ed5i, s\u01a1 \u0111\u1ed3 s\u1ebd tr\u1edf n\u00ean l\u1ed7i th\u1eddi. H\u00e3y coi ch\u00fang nh\u01b0 c\u00e1c t\u00e0i li\u1ec7u s\u1ed1ng trong b\u1ed9 t\u00e0i li\u1ec7u c\u1ee7a b\u1ea1n.<\/p>\n

                  Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh \u274c<\/h2>\n

                  Ngay c\u1ea3 nh\u1eefng ng\u01b0\u1eddi m\u00f4 h\u00ecnh h\u00f3a c\u00f3 kinh nghi\u1ec7m c\u0169ng m\u1eafc sai l\u1ea7m. H\u00e3y c\u1ea3nh gi\u00e1c v\u1edbi nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn n\u00e0y.<\/p>\n

                    \n
                  • Nh\u1ea7m l\u1eabn gi\u1eefa L\u1edbp v\u00e0 \u0110\u1ed1i t\u01b0\u1ee3ng:<\/strong> \u0110\u1eebng ghi t\u00ean l\u1edbp m\u00e0 kh\u00f4ng c\u00f3 d\u1ea5u hai ch\u1ea5m ho\u1eb7c t\u00ean th\u1ec3 hi\u1ec7n. Ph\u1ea3i r\u00f5 r\u00e0ng \u0111\u00e2u l\u00e0 c\u00e1i n\u00e0o.<\/li>\n
                  • B\u1ecf qua c\u00e1c gi\u00e1 tr\u1ecb null:<\/strong> N\u1ebfu m\u1ed9t thu\u1ed9c t\u00ednh l\u00e0 t\u00f9y ch\u1ecdn v\u00e0 hi\u1ec7n \u0111ang tr\u1ed1ng, h\u00e3y bi\u1ec3u di\u1ec5n \u0111i\u1ec1u \u0111\u00f3 r\u00f5 r\u00e0ng. \u0110\u1eebng \u0111\u1ec3 tr\u1ed1ng n\u1ebfu \u0111i\u1ec1u \u0111\u00f3 ng\u1ee5 \u00fd r\u1eb1ng m\u1ed9t gi\u00e1 tr\u1ecb t\u1ed3n t\u1ea1i.<\/li>\n
                  • S\u1eed d\u1ee5ng qu\u00e1 m\u1ee9c t\u00ednh k\u1ebft h\u1ee3p:<\/strong> T\u00ednh k\u1ebft h\u1ee3p ng\u1ee5 \u00fd quy\u1ec1n s\u1edf h\u1eefu. \u0110\u1eebng d\u00f9ng n\u00f3 cho c\u00e1c m\u1ed1i quan h\u1ec7 m\u00e0 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp.<\/li>\n
                  • Thi\u1ebfu li\u00ean k\u1ebft:<\/strong> N\u1ebfu hai \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau, ch\u00fang ph\u1ea3i \u0111\u01b0\u1ee3c li\u00ean k\u1ebft. N\u1ebfu b\u1ea1n qu\u00ean m\u1ed9t li\u00ean k\u1ebft, logic s\u1ebd b\u1ecb h\u1ecfng.<\/li>\n
                  • Qu\u00e1 nhi\u1ec1u chi ti\u1ebft:<\/strong> \u0110\u1eebng li\u1ec7t k\u00ea t\u1eebng thu\u1ed9c t\u00ednh n\u1ebfu ch\u1ec9 m\u1ed9t v\u00e0i thu\u1ed9c t\u00ednh li\u00ean quan \u0111\u1ebfn t\u00ecnh hu\u1ed1ng. T\u1eadp trung v\u00e0o d\u1eef li\u1ec7u quan tr\u1ecdng trong b\u1ed1i c\u1ea3nh.<\/li>\n<\/ul>\n

                    Nh\u1eefng kh\u00e1i ni\u1ec7m n\u00e2ng cao: S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ed9ng \ud83d\udd04<\/h2>\n

                    C\u00e1c s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ti\u00eau chu\u1ea9n l\u00e0 t\u0129nh. Tuy nhi\u00ean, trong m\u1ed9t s\u1ed1 ph\u01b0\u01a1ng ph\u00e1p, b\u1ea1n c\u00f3 th\u1ec3 xem x\u00e9t m\u1ed9t chu\u1ed7i c\u00e1c \u1ea3nh ch\u1ee5p nhanh. \u0110i\u1ec1u n\u00e0y t\u01b0\u01a1ng t\u1ef1 nh\u01b0 m\u1ed9t m\u00e1y tr\u1ea1ng th\u00e1i nh\u01b0ng t\u1eadp trung v\u00e0o d\u1eef li\u1ec7u.<\/p>\n

                    \u0110i\u1ec1u n\u00e0y h\u1eefu \u00edch cho:<\/p>\n

                      \n
                    • Theo d\u00f5i lu\u1ed3ng d\u1eef li\u1ec7u trong qu\u00e1 tr\u00ecnh giao d\u1ecbch.<\/li>\n
                    • Tr\u1ef1c quan h\u00f3a v\u00f2ng \u0111\u1eddi c\u1ee7a m\u1ed9t th\u1ef1c th\u1ec3 c\u1ee5 th\u1ec3.<\/li>\n
                    • G\u1ee1 l\u1ed7i r\u00f2 r\u1ec9 b\u1ed9 nh\u1edb ho\u1eb7c c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 duy tr\u00ec \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n<\/ul>\n

                      M\u1eb7c d\u00f9 \u0111i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi nhi\u1ec1u n\u1ed7 l\u1ef1c h\u01a1n, nh\u01b0ng n\u00f3 cung c\u1ea5p c\u00e1i nh\u00ecn s\u00e2u s\u1eafc v\u1ec1 h\u00e0nh vi h\u1ec7 th\u1ed1ng m\u00e0 s\u01a1 \u0111\u1ed3 l\u1edbp kh\u00f4ng th\u1ec3 th\u1ec3 hi\u1ec7n.<\/p>\n

                      T\u00edch h\u1ee3p v\u1edbi c\u00e1c s\u01a1 \u0111\u1ed3 UML kh\u00e1c \ud83e\udde0<\/h2>\n

                      S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng t\u1ed3n t\u1ea1i m\u1ed9t c\u00e1ch c\u00f4 l\u1eadp. N\u00f3 b\u1ed5 sung cho c\u00e1c s\u01a1 \u0111\u1ed3 kh\u00e1c trong b\u1ed9 c\u00f4ng c\u1ee5 UML.<\/p>\n

                      V\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp<\/h3>\n

                      S\u01a1 \u0111\u1ed3 l\u1edbp x\u00e1c \u0111\u1ecbnh c\u00e1c quy t\u1eafc. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng ki\u1ec3m tra c\u00e1c quy t\u1eafc \u0111\u00f3. N\u1ebfu s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a b\u1ea1n vi ph\u1ea1m c\u00e1c r\u00e0ng bu\u1ed9c c\u1ee7a s\u01a1 \u0111\u1ed3 l\u1edbp, b\u1ea1n \u0111\u00e3 m\u1eafc l\u1ed7i thi\u1ebft k\u1ebf.<\/p>\n

                      V\u1edbi s\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1<\/h3>\n

                      S\u01a1 \u0111\u1ed3 tu\u1ea7n t\u1ef1 th\u1ec3 hi\u1ec7n lu\u1ed3ng tin nh\u1eafn. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n c\u00e1c th\u00e0nh vi\u00ean tham gia v\u00e0o lu\u1ed3ng \u0111\u00f3. S\u1eed d\u1ee5ng ch\u00fang c\u00f9ng nhau s\u1ebd cung c\u1ea5p b\u1ee9c tranh to\u00e0n di\u1ec7n v\u1ec1 ai \u0111ang n\u00f3i chuy\u1ec7n v\u00e0 tr\u1ea1ng th\u00e1i hi\u1ec7n t\u1ea1i c\u1ee7a h\u1ecd l\u00e0 g\u00ec.<\/p>\n

                      V\u1edbi s\u01a1 \u0111\u1ed3 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng<\/h3>\n

                      S\u01a1 \u0111\u1ed3 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng th\u1ec3 hi\u1ec7n ch\u1ee9c n\u0103ng. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ec3 hi\u1ec7n d\u1eef li\u1ec7u c\u1ea7n thi\u1ebft \u0111\u1ec3 th\u1ef1c hi\u1ec7n ch\u1ee9c n\u0103ng \u0111\u00f3. \u0110i\u1ec1u n\u00e0y gi\u00fap h\u1ed7 tr\u1ee3 ph\u00e2n t\u00edch y\u00eau c\u1ea7u.<\/p>\n

                      C\u00f4ng c\u1ee5 v\u00e0 tri\u1ec3n khai \ud83d\udda5\ufe0f<\/h2>\n

                      B\u1ea1n kh\u00f4ng c\u1ea7n ph\u1ea7n m\u1ec1m \u0111\u1eaft ti\u1ec1n \u0111\u1ec3 t\u1ea1o c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y. Nhi\u1ec1u c\u00f4ng c\u1ee5 mi\u1ec5n ph\u00ed h\u1ed7 tr\u1ee3 k\u00fd hi\u1ec7u UML. Khi ch\u1ecdn c\u00f4ng c\u1ee5, h\u00e3y t\u00ecm ki\u1ebfm:<\/p>\n

                        \n
                      • Giao di\u1ec7n k\u00e9o v\u00e0 th\u1ea3:<\/strong>D\u1ec5 d\u00e0ng t\u1ea1o h\u00ecnh ch\u1eef nh\u1eadt v\u00e0 c\u00e1c li\u00ean k\u1ebft.<\/li>\n
                      • Nh\u00e3n v\u0103n b\u1ea3n:<\/strong>Kh\u1ea3 n\u0103ng ch\u1ec9nh s\u1eeda gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh m\u1ed9t c\u00e1ch d\u1ec5 d\u00e0ng.<\/li>\n
                      • T\u00f9y ch\u1ecdn xu\u1ea5t:<\/strong>Kh\u1ea3 n\u0103ng l\u01b0u d\u01b0\u1edbi d\u1ea1ng PDF ho\u1eb7c PNG \u0111\u1ec3 s\u1eed d\u1ee5ng trong t\u00e0i li\u1ec7u.<\/li>\n
                      • X\u00e1c th\u1ef1c:<\/strong>M\u1ed9t s\u1ed1 c\u00f4ng c\u1ee5 c\u00f3 th\u1ec3 ki\u1ec3m tra xem s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n c\u00f3 tu\u00e2n theo ti\u00eau chu\u1ea9n UML hay kh\u00f4ng.<\/li>\n<\/ul>\n

                        H\u00e3y nh\u1edb, c\u00f4ng c\u1ee5 l\u00e0 th\u1ee9 th\u1ee9 y\u1ebfu. S\u1ef1 r\u00f5 r\u00e0ng trong t\u01b0 duy c\u1ee7a b\u1ea1n l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng nh\u1ea5t. M\u1ed9t b\u1ea3n ph\u00e1c th\u1ea3o tay th\u01b0\u1eddng t\u1ed1t h\u01a1n m\u1ed9t s\u01a1 \u0111\u1ed3 k\u1ef9 thu\u1eadt s\u1ed1 \u0111\u01b0\u1ee3c t\u1ea1o k\u00e9m.<\/p>\n

                        Xem x\u00e9t l\u1ea1i c\u00e1c s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n \ud83d\udd0d<\/h2>\n

                        Tr\u01b0\u1edbc khi ho\u00e0n thi\u1ec7n m\u1ed9t s\u01a1 \u0111\u1ed3, h\u00e3y th\u1ef1c hi\u1ec7n \u0111\u00e1nh gi\u00e1 t\u1eeb \u0111\u1ed3ng nghi\u1ec7p. H\u00e3y \u0111\u1eb7t ra nh\u1eefng c\u00e2u h\u1ecfi sau:<\/p>\n

                          \n
                        • N\u00f3 c\u00f3 kh\u1edbp v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp kh\u00f4ng?<\/strong>C\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 nh\u1ea5t qu\u00e1n kh\u00f4ng?<\/li>\n
                        • D\u1eef li\u1ec7u c\u00f3 th\u1ef1c t\u1ebf kh\u00f4ng?<\/strong> C\u00e1c gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh c\u00f3 h\u1ee3p l\u00fd v\u1edbi t\u00ecnh hu\u1ed1ng n\u00e0y kh\u00f4ng?<\/li>\n
                        • N\u00f3 c\u00f3 d\u1ec5 \u0111\u1ecdc kh\u00f4ng?<\/strong>M\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n m\u1edbi c\u00f3 th\u1ec3 hi\u1ec3u c\u1ea5u tr\u00fac m\u00e0 kh\u00f4ng c\u1ea7n gi\u1ea3i th\u00edch kh\u00f4ng?<\/li>\n
                        • N\u00f3 c\u00f3 \u0111\u1ea7y \u0111\u1ee7 kh\u00f4ng?<\/strong>T\u1ea5t c\u1ea3 c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 li\u00ean k\u1ebft c\u1ea7n thi\u1ebft c\u00f3 hi\u1ec7n di\u1ec7n kh\u00f4ng?<\/li>\n<\/ul>\n

                          T\u00f3m t\u1eaft nh\u1eefng \u0111i\u1ec3m ch\u00ednh c\u1ea7n ghi nh\u1edb \ud83c\udfaf<\/h2>\n

                          S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng. Ch\u00fang t\u1ea1o ra s\u1ef1 li\u00ean k\u1ebft gi\u1eefa thi\u1ebft k\u1ebf tr\u1eebu t\u01b0\u1ee3ng (L\u1edbp) v\u00e0 th\u1ef1c t\u1ebf c\u1ee5 th\u1ec3 (D\u1eef li\u1ec7u).<\/p>\n

                            \n
                          • Hi\u1ec3u s\u1ef1 kh\u00e1c bi\u1ec7t:<\/strong>L\u1edbp l\u00e0 ki\u1ec3u; \u0110\u1ed1i t\u01b0\u1ee3ng l\u00e0 th\u1ec3 hi\u1ec7n.<\/li>\n
                          • T\u1eadp trung v\u00e0o c\u00e1c b\u1ee9c \u1ea3nh ch\u1ee5p:<\/strong>Ghi l\u1ea1i tr\u1ea1ng th\u00e1i t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3.<\/li>\n
                          • Tu\u00e2n theo k\u00fd hi\u1ec7u:<\/strong>S\u1eed d\u1ee5ng k\u00fd ph\u00e1p h\u00ecnh ch\u1eef nh\u1eadt chu\u1ea9n v\u00e0 k\u00fd ph\u00e1p li\u00ean k\u1ebft.<\/li>\n
                          • X\u00e1c minh c\u00e1c m\u1ed1i quan h\u1ec7:<\/strong>\u0110\u1ea3m b\u1ea3o c\u00e1c li\u00ean k\u1ebft ph\u00f9 h\u1ee3p v\u1edbi quy t\u1eafc kinh doanh.<\/li>\n
                          • Gi\u1eef \u0111\u01a1n gi\u1ea3n:<\/strong>Tr\u00e1nh s\u1ef1 ph\u1ee9c t\u1ea1p kh\u00f4ng c\u1ea7n thi\u1ebft.<\/li>\n<\/ul>\n

                            B\u1eb1ng c\u00e1ch th\u00e0nh th\u1ea1o c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y, b\u1ea1n c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng giao ti\u1ebfp v\u1edbi c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 c\u00e1c b\u00ean li\u00ean quan. B\u1ea1n gi\u1ea3m thi\u1ec3u s\u1ef1 m\u01a1 h\u1ed3 v\u00e0 \u0111\u1ea3m b\u1ea3o h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng tr\u00ean n\u1ec1n t\u1ea3ng v\u1eefng ch\u1eafc c\u1ee7a c\u00e1c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u r\u00f5 r\u00e0ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

                            Ch\u00e0o m\u1eebng b\u1ea1n \u0111\u1ebfn v\u1edbi th\u1ebf gi\u1edbi m\u00f4 h\u00ecnh h\u00f3a ph\u1ea7n m\u1ec1m. N\u1ebfu b\u1ea1n t\u1eebng nh\u00ecn v\u00e0o m\u1ed9t h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p v\u00e0 t\u1ef1 h\u1ecfi l\u00e0m th\u1ebf n\u00e0o c\u00e1c th\u00e0nh…<\/p>\n","protected":false},"author":1,"featured_media":1530,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u: H\u01b0\u1edbng d\u1eabn h\u1ecdc UML","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch t\u1ea1o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML. H\u01b0\u1edbng d\u1eabn t\u1eebng b\u01b0\u1edbc cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u bao g\u1ed3m c\u00fa ph\u00e1p, m\u1ed1i quan h\u1ec7 v\u00e0 c\u00e1c v\u00ed d\u1ee5 th\u1ef1c t\u1ebf m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea7n m\u1ec1m.","fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[54],"tags":[84,85],"class_list":["post-1529","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-unified-modeling-language","tag-academic","tag-object-diagram"],"yoast_head":"\nS\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u: H\u01b0\u1edbng d\u1eabn h\u1ecdc UML<\/title>\n<meta name=\"description\" content=\"H\u1ecdc c\u00e1ch t\u1ea1o s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng UML. 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