{"id":1491,"date":"2026-04-01T18:45:04","date_gmt":"2026-04-01T18:45:04","guid":{"rendered":"https:\/\/www.viz-read.com\/vi\/how-to-read-object-diagram-pro-guide\/"},"modified":"2026-04-01T18:45:04","modified_gmt":"2026-04-01T18:45:04","slug":"how-to-read-object-diagram-pro-guide","status":"publish","type":"post","link":"https:\/\/www.viz-read.com\/vi\/how-to-read-object-diagram-pro-guide\/","title":{"rendered":"C\u00e1ch \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng nh\u01b0 m\u1ed9t chuy\u00ean gia: H\u01b0\u1edbng d\u1eabn cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u v\u1ec1 n\u0103ng l\u1ef1c tr\u1ef1c quan"},"content":{"rendered":"
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\"Line<\/figure>\n<\/div>\n

\ud83d\udc4b Gi\u1edbi thi\u1ec7u v\u1ec1 n\u0103ng l\u1ef1c tr\u1ef1c quan trong thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m<\/h2>\n

Trong b\u1ed1i c\u1ea3nh ph\u1ee9c t\u1ea1p c\u1ee7a ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m, vi\u1ec7c hi\u1ec3u c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a m\u1ed9t h\u1ec7 th\u1ed1ng l\u00e0 \u0111i\u1ec1u then ch\u1ed1t. Trong khi t\u00e0i li\u1ec7u d\u1ef1a tr\u00ean v\u0103n b\u1ea3n cung c\u1ea5p chi ti\u1ebft, c\u00e1c bi\u1ec3u di\u1ec5n tr\u1ef1c quan l\u1ea1i mang l\u1ea1i c\u00e1i nh\u00ecn t\u1ee9c th\u00ec v\u1ec1 c\u00e1ch c\u00e1c th\u00e0nh ph\u1ea7n t\u01b0\u01a1ng t\u00e1c t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fac s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng tr\u1edf th\u00e0nh c\u00f4ng c\u1ee5 thi\u1ebft y\u1ebfu cho c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n, ki\u1ebfn tr\u00fac s\u01b0 v\u00e0 c\u00e1c b\u00ean li\u00ean quan. Vi\u1ec7c \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 \u0111\u00f2i h\u1ecfi h\u01a1n c\u1ea3 vi\u1ec7c nh\u1eadn bi\u1ebft h\u00ecnh d\u1ea1ng; n\u00f3 \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 c\u00e1c th\u1ec3 hi\u1ec7n, thu\u1ed9c t\u00ednh v\u00e0 m\u1ed1i quan h\u1ec7 trong tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 th\u1ef1c t\u1ebf.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 x\u00e2y d\u1ef1ng n\u0103ng l\u1ef1c tr\u1ef1c quan c\u1ee7a b\u1ea1n. Ch\u00fang ta s\u1ebd \u0111i xa h\u01a1n c\u00e1c \u0111\u1ecbnh ngh\u0129a \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 kh\u00e1m ph\u00e1 c\u01a1 ch\u1ebf di\u1ec5n gi\u1ea3i. \u0110\u1ebfn cu\u1ed1i b\u00e0i vi\u1ebft n\u00e0y, b\u1ea1n s\u1ebd c\u00f3 th\u1ec3 nh\u00ecn v\u00e0o m\u1ed9t s\u01a1 \u0111\u1ed3 v\u00e0 hi\u1ec3u ch\u00ednh x\u00e1c tr\u1ea1ng th\u00e1i c\u1ea5u tr\u00fac d\u1eef li\u1ec7u c\u1ee7a \u1ee9ng d\u1ee5ng m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i ch\u1ea1y m\u00e3 ngu\u1ed3n. K\u1ef9 n\u0103ng n\u00e0y r\u1ea5t quan tr\u1ecdng cho vi\u1ec7c g\u1ee1 l\u1ed7i, t\u00e0i li\u1ec7u h\u00f3a v\u00e0 \u0111\u00e1nh gi\u00e1 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng. Ch\u00fang ta s\u1ebd t\u1eadp trung v\u00e0o c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i, k\u00fd hi\u1ec7u v\u00e0 logic \u0111\u1eb1ng sau c\u00e1c k\u1ebft n\u1ed1i, \u0111\u1ea3m b\u1ea3o b\u1ea1n c\u00f3 th\u1ec3 gi\u1ea3i m\u00e3 c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y m\u1ed9t c\u00e1ch t\u1ef1 tin.<\/p>\n

\ud83e\udde9 Ch\u00ednh x\u00e1c th\u00ec s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 g\u00ec?<\/h2>\n

S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p l\u1ea1i tr\u1ea1ng th\u00e1i c\u1ee7a h\u1ec7 th\u1ed1ng t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3. \u0110\u00e2y l\u00e0 m\u1ed9t lo\u1ea1i s\u01a1 \u0111\u1ed3 UML (Ng\u00f4n ng\u1eef m\u00f4 h\u00ecnh h\u00f3a th\u1ed1ng nh\u1ea5t) chuy\u00ean bi\u1ec7t, t\u1eadp trung v\u00e0o c\u00e1c th\u1ec3 hi\u1ec7n thay v\u00ec b\u1ea3n v\u1ebd ph\u00e1c th\u1ea3o. Trong khi s\u01a1 \u0111\u1ed3 l\u1edbp th\u1ec3 hi\u1ec7n c\u00e1c quy t\u1eafc v\u00e0 m\u1eabu \u0111\u1ec3 x\u00e2y d\u1ef1ng \u0111\u1ed1i t\u01b0\u1ee3ng, th\u00ec s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u1ea1i th\u1ec3 hi\u1ec7n c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng th\u1ef1c t\u1ebf \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o ra v\u00e0 c\u00e1ch ch\u00fang k\u1ebft n\u1ed1i v\u1edbi nhau ngay l\u00fac n\u00e0y.<\/p>\n

    \n
  • G\u00f3c nh\u00ecn t\u0129nh:<\/strong> N\u00f3 th\u1ec3 hi\u1ec7n m\u1ed9t c\u1ea5u tr\u00fac t\u0129nh, t\u01b0\u01a1ng t\u1ef1 nh\u01b0 s\u01a1 \u0111\u1ed3 l\u1edbp, nh\u01b0ng \u0111\u01b0\u1ee3c \u0111i\u1ec1n \u0111\u1ea7y d\u1eef li\u1ec7u th\u1ef1c t\u1ebf.<\/li>\n
  • T\u1eadp trung v\u00e0o th\u1ec3 hi\u1ec7n:<\/strong> N\u00f3 x\u1eed l\u00fd c\u00e1c th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 (\u0111\u1ed1i t\u01b0\u1ee3ng) thay v\u00ec c\u00e1c l\u1edbp t\u1ed5ng qu\u00e1t.<\/li>\n
  • C\u00f3 gi\u1edbi h\u1ea1n th\u1eddi gian:<\/strong> N\u00f3 ghi l\u1ea1i m\u1ed9t kho\u1ea3nh kh\u1eafc, th\u01b0\u1eddng \u0111\u1ea1i di\u1ec7n cho m\u1ed9t tr\u01b0\u1eddng h\u1ee3p ki\u1ec3m th\u1eed c\u1ee5 th\u1ec3 ho\u1eb7c m\u1ed9t t\u00ecnh hu\u1ed1ng s\u1ea3n xu\u1ea5t.<\/li>\n<\/ul>\n

    H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng s\u01a1 \u0111\u1ed3 l\u1edbp nh\u01b0 b\u1ea3n v\u1ebd ph\u00e1c th\u1ea3o cho m\u1ed9t ng\u00f4i nh\u00e0. N\u00f3 cho th\u1ea5y c\u1eeda v\u00e0 c\u1eeda s\u1ed5 n\u00ean \u0111\u01b0\u1ee3c \u0111\u1eb7t \u1edf \u0111\u00e2u. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 m\u1ed9t b\u1ee9c \u1ea3nh ch\u1ee5p m\u1ed9t ng\u00f4i nh\u00e0 c\u1ee5 th\u1ec3 \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng. N\u00f3 cho th\u1ea5y c\u00e1nh c\u1eeda th\u1ef1c t\u1ebf, m\u00e0u s\u01a1n t\u01b0\u1eddng c\u1ee5 th\u1ec3 v\u00e0 ai \u0111ang \u0111\u1ee9ng \u1edf c\u1eeda ra v\u00e0o. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y l\u00e0 n\u1ec1n t\u1ea3ng \u0111\u1ec3 \u0111\u1ecdc c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c.<\/p>\n

    \ud83d\udd0d Gi\u1ea3i ph\u1eabu c\u1ee7a s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng<\/h2>\n

    \u0110\u1ec3 \u0111\u1ecdc m\u1ed9t s\u01a1 \u0111\u1ed3 m\u1ed9t c\u00e1ch tr\u00f4i ch\u1ea3y, b\u1ea1n ph\u1ea3i hi\u1ec3u c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a n\u00f3. M\u1ed7i s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng t\u1eeb m\u1ed9t v\u00e0i y\u1ebfu t\u1ed1 ch\u00ednh. Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y mang \u00fd ngh\u0129a c\u1ee5 th\u1ec3, khi k\u1ebft h\u1ee3p l\u1ea1i s\u1ebd k\u1ec3 n\u00ean c\u00e2u chuy\u1ec7n v\u1ec1 tr\u1ea1ng th\u00e1i c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

    1. C\u00e1c th\u1ec3 hi\u1ec7n \u0111\u1ed1i t\u01b0\u1ee3ng<\/h3>\n

    C\u00e1c th\u1ec3 hi\u1ec7n l\u00e0 nh\u1eefng nh\u00e2n v\u1eadt ch\u00ednh trong s\u01a1 \u0111\u1ed3. Ch\u00fang \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n d\u01b0\u1edbi d\u1ea1ng h\u00ecnh ch\u1eef nh\u1eadt. M\u1ed7i h\u00ecnh ch\u1eef nh\u1eadt \u0111\u1ea1i di\u1ec7n cho m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee5 th\u1ec3 \u0111\u00e3 \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o t\u1eeb m\u1ed9t l\u1edbp. H\u00ecnh ch\u1eef nh\u1eadt \u0111\u01b0\u1ee3c chia th\u00e0nh c\u00e1c ph\u1ea7n, th\u01b0\u1eddng l\u00e0 ba ph\u1ea7n, \u0111\u1ec3 truy\u1ec1n t\u1ea3i c\u00e1c m\u1ee9c \u0111\u1ed9 th\u00f4ng tin kh\u00e1c nhau.<\/p>\n

      \n
    • Ph\u1ea7n tr\u00ean:<\/strong> Ch\u1ee9a t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 t\u00ean l\u1edbp m\u00e0 n\u00f3 thu\u1ed9c v\u1ec1.<\/li>\n
    • Ph\u1ea7n gi\u1eefa:<\/strong> Li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n
    • Ph\u1ea7n d\u01b0\u1edbi:<\/strong> Li\u1ec7t k\u00ea c\u00e1c gi\u00e1 tr\u1ecb \u0111\u01b0\u1ee3c g\u00e1n cho c\u00e1c thu\u1ed9c t\u00ednh \u0111\u00f3 v\u00e0o th\u1eddi \u0111i\u1ec3m ch\u1ee5p \u1ea3nh.<\/li>\n<\/ul>\n

      2. C\u00e1c li\u00ean k\u1ebft v\u00e0 m\u1ed1i quan h\u1ec7<\/h3>\n

      C\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng t\u1ed3n t\u1ea1i m\u1ed9t c\u00e1ch c\u00f4 l\u1eadp. Ch\u00fang \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c th\u00f4ng qua c\u00e1c li\u00ean k\u1ebft. Nh\u1eefng li\u00ean k\u1ebft n\u00e0y \u0111\u1ea1i di\u1ec7n cho c\u00e1c m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c th\u1ec3 hi\u1ec7n. M\u1ed9t li\u00ean k\u1ebft th\u1ef1c ch\u1ea5t l\u00e0 m\u1ed9t m\u1ed1i quan h\u1ec7 c\u1ee5 th\u1ec3 gi\u1eefa hai \u0111\u1ed1i t\u01b0\u1ee3ng, t\u01b0\u01a1ng t\u1ef1 nh\u01b0 m\u1ed1i quan h\u1ec7 gi\u1eefa c\u00e1c l\u1edbp, nh\u01b0ng mang t\u00ednh c\u1ee5 th\u1ec3.<\/p>\n

        \n
      • Li\u00ean k\u1ebft li\u00ean k\u1ebft:<\/strong>C\u00e1c k\u1ebft n\u1ed1i ti\u00eau chu\u1ea9n gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n
      • \u0110a d\u1ea1ng:<\/strong>Ch\u1ec9 ra m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 k\u1ebft n\u1ed1i v\u1edbi bao nhi\u00eau \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c (v\u00ed d\u1ee5: m\u1ed9t-nhi\u1ec1u).<\/li>\n
      • Kh\u1ea3 n\u0103ng \u0111i\u1ec1u h\u01b0\u1edbng:<\/strong> \u0110\u00f4i khi \u0111\u01b0\u1ee3c ch\u1ec9 ra b\u1eb1ng c\u00e1c m\u0169i t\u00ean, cho th\u1ea5y m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 \u0111i theo h\u01b0\u1edbng n\u00e0o.<\/li>\n<\/ul>\n

        \ud83d\udccb H\u01b0\u1edbng d\u1eabn k\u00fd hi\u1ec7u: C\u00e1c k\u00fd hi\u1ec7u v\u00e0 \u00fd ngh\u0129a<\/h2>\n

        Tr\u00ed tu\u1ec7 th\u1ecb gi\u00e1c d\u1ef1a v\u00e0o vi\u1ec7c nh\u1eadn bi\u1ebft nhanh c\u00e1c k\u00fd hi\u1ec7u. B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y n\u00eau r\u00f5 k\u00fd hi\u1ec7u chu\u1ea9n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng. Hi\u1ec3u \u0111\u01b0\u1ee3c c\u00e1c k\u00fd hi\u1ec7u n\u00e0y gi\u00fap b\u1ea1n qu\u00e9t nhanh s\u01a1 \u0111\u1ed3 v\u00e0 tr\u00edch xu\u1ea5t \u00fd ngh\u0129a.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
        Y\u1ebfu t\u1ed1<\/th>\nBi\u1ec3u di\u1ec5n tr\u1ef1c quan<\/th>\n\u00dd ngh\u0129a<\/th>\n<\/tr>\n<\/thead>\n
        Th\u1ec3 hi\u1ec7n \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\nH\u00ecnh ch\u1eef nh\u1eadt c\u00f3 ba ph\u1ea7n<\/td>\nM\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 c\u1ee7a m\u1ed9t l\u1edbp v\u1edbi c\u00e1c gi\u00e1 tr\u1ecb \u0111\u00e3 x\u00e1c \u0111\u1ecbnh<\/td>\n<\/tr>\n
        T\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\nV\u0103n b\u1ea3n g\u1ea1ch ch\u00e2n \u1edf tr\u00ean c\u00f9ng<\/td>\n\u0110\u1ecbnh danh duy nh\u1ea5t cho th\u1ec3 hi\u1ec7n (v\u00ed d\u1ee5: user1<\/em>)<\/td>\n<\/tr>\n
        T\u00ean l\u1edbp<\/td>\nV\u0103n b\u1ea3n \u0111i theo t\u00ean th\u1ec3 hi\u1ec7n<\/td>\nB\u1ea3n v\u1ebd m\u1eabu m\u00e0 th\u1ec3 hi\u1ec7n \u0111\u01b0\u1ee3c t\u1ea1o ra t\u1eeb (v\u00ed d\u1ee5: :Customer<\/em>)<\/td>\n<\/tr>\n
        Thu\u1ed9c t\u00ednh<\/td>\nV\u0103n b\u1ea3n \u1edf ph\u1ea7n gi\u1eefa<\/td>\nM\u1ed9t thu\u1ed9c t\u00ednh c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng (v\u00ed d\u1ee5: email<\/em>)<\/td>\n<\/tr>\n
        Gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh<\/td>\nV\u0103n b\u1ea3n \u1edf ph\u1ea7n d\u01b0\u1edbi<\/td>\nD\u1eef li\u1ec7u th\u1ef1c t\u1ebf \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef t\u1ea1i th\u1eddi \u0111i\u1ec3m n\u00e0y (v\u00ed d\u1ee5: \u201ctest@example.com\u201d<\/em>)<\/td>\n<\/tr>\n
        Li\u00ean k\u1ebft<\/td>\n\u0110\u01b0\u1eddng n\u1ed1i gi\u1eefa hai \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\nM\u1ed9t m\u1ed1i quan h\u1ec7 gi\u1eefa hai th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n
        Nh\u00e3n li\u00ean k\u1ebft<\/td>\nV\u0103n b\u1ea3n tr\u00ean \u0111\u01b0\u1eddng n\u1ed1i<\/td>\nVai tr\u00f2 ho\u1eb7c t\u00ean c\u1ee7a m\u1ed1i quan h\u1ec7<\/td>\n<\/tr>\n
        T\u00ednh \u0111a d\u1ea1ng<\/td>\nC\u00e1c con s\u1ed1 \u1edf hai \u0111\u1ea7u li\u00ean k\u1ebft<\/td>\nC\u00e1c r\u00e0ng bu\u1ed9c v\u1ec1 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

        \ud83e\udded Quy tr\u00ecnh t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 \u0111\u1ecdc<\/h2>\n

        Vi\u1ec7c \u0111\u1ecdc m\u1ed9t s\u01a1 \u0111\u1ed3 l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh c\u00f3 h\u1ec7 th\u1ed1ng. V\u1ed9i v\u00e0ng qua n\u00f3 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn hi\u1ec3u l\u1ea7m v\u1ec1 tr\u1ea1ng th\u00e1i c\u1ee7a h\u1ec7 th\u1ed1ng. H\u00e3y tu\u00e2n theo c\u00e1ch ti\u1ebfp c\u1eadn c\u00f3 c\u1ea5u tr\u00fac n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o di\u1ec5n gi\u1ea3i ch\u00ednh x\u00e1c.<\/p>\n

        B\u01b0\u1edbc 1: X\u00e1c \u0111\u1ecbnh c\u00e1c th\u1ec3 hi\u1ec7n<\/h3>\n

        B\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1ch qu\u00e9t s\u01a1 \u0111\u1ed3 \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh t\u1ea5t c\u1ea3 c\u00e1c h\u00ecnh ch\u1eef nh\u1eadt. \u0110\u1ebfm ch\u00fang. M\u1ed7i h\u00ecnh ch\u1eef nh\u1eadt \u0111\u1ea1i di\u1ec7n cho m\u1ed9t th\u1ef1c th\u1ec3 ri\u00eang bi\u1ec7t trong h\u1ec7 th\u1ed1ng. Ghi ch\u00fa t\u00ean. N\u1ebfu b\u1ea1n th\u1ea5y order1<\/em> v\u00e0 order2<\/em>, b\u1ea1n \u0111ang nh\u00ecn v\u00e0o hai giao d\u1ecbch ri\u00eang bi\u1ec7t, ch\u1ee9 kh\u00f4ng ph\u1ea3i m\u1ed9t giao d\u1ecbch t\u1ed5ng qu\u00e1t.<\/p>\n

        B\u01b0\u1edbc 2: Ph\u00e2n t\u00edch c\u00e1c thu\u1ed9c t\u00ednh<\/h3>\n

        H\u00e3y nh\u00ecn v\u00e0o c\u00e1c ph\u1ea7n gi\u1eefa v\u00e0 ph\u00eda d\u01b0\u1edbi c\u1ee7a m\u1ed7i h\u00ecnh ch\u1eef nh\u1eadt. \u0110i\u1ec1u n\u00e0y cho b\u1ea1n bi\u1ebft tr\u1ea1ng th\u00e1i c\u1ee7a d\u1eef li\u1ec7u. N\u1ebfu m\u1ed9t thu\u1ed9c t\u00ednh tr\u1ed1ng, n\u00f3 c\u00f3 th\u1ec3 l\u00e0 null ho\u1eb7c ch\u01b0a \u0111\u01b0\u1ee3c kh\u1edfi t\u1ea1o. N\u1ebfu n\u00f3 c\u00f3 gi\u00e1 tr\u1ecb, th\u00ec n\u00f3 \u0111ang ho\u1ea1t \u0111\u1ed9ng. H\u00e3y ch\u00fa \u00fd \u0111\u1ebfn ki\u1ec3u d\u1eef li\u1ec7u. M\u1ed9t gi\u00e1 tr\u1ecb chu\u1ed7i tr\u00f4ng kh\u00e1c bi\u1ec7t v\u1edbi m\u1ed9t gi\u00e1 tr\u1ecb s\u1ed1 nguy\u00ean.<\/p>\n

        B\u01b0\u1edbc 3: Theo d\u00f5i c\u00e1c li\u00ean k\u1ebft<\/h3>\n

        Chuy\u1ec3n sang c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. Theo d\u00f5i t\u1eeb m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng sang \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c. H\u00e3y t\u1ef1 h\u1ecfi: Li\u00ean k\u1ebft n\u00e0y \u0111\u1ea1i di\u1ec7n cho \u0111i\u1ec1u g\u00ec? C\u00f3 ph\u1ea3i l\u00e0 m\u1ed1i quan h\u1ec7 cha-con? C\u00f3 ph\u1ea3i l\u00e0 s\u1ef1 ph\u1ee5 thu\u1ed9c? Tu\u00e2n theo h\u01b0\u1edbng m\u0169i t\u00ean n\u1ebfu c\u00f3. \u0110i\u1ec1u n\u00e0y ti\u1ebft l\u1ed9 lu\u1ed3ng d\u1eef li\u1ec7u ho\u1eb7c \u0111i\u1ec1u khi\u1ec3n.<\/p>\n

        B\u01b0\u1edbc 4: Ki\u1ec3m tra t\u00ednh \u0111a d\u1ea1ng<\/h3>\n

        H\u00e3y nh\u00ecn v\u00e0o c\u00e1c con s\u1ed1 g\u1ea7n hai \u0111\u1ea7u c\u1ee7a li\u00ean k\u1ebft. N\u1ebfu b\u1ea1n th\u1ea5y m\u1ed9t 1<\/em>, n\u00f3 c\u00f3 ngh\u0129a l\u00e0 \u0111\u00fang m\u1ed9t. N\u1ebfu b\u1ea1n th\u1ea5y m\u1ed9t 0..*<\/em>, n\u00f3 c\u00f3 ngh\u0129a l\u00e0 kh\u00f4ng ho\u1eb7c nhi\u1ec1u h\u01a1n. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u c\u00e1c r\u00e0ng bu\u1ed9c. V\u00ed d\u1ee5, m\u1ed9t Kh\u00e1ch h\u00e0ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi 0 ho\u1eb7c nhi\u1ec1u \u0110\u01a1n h\u00e0ng. M\u1ed9t \u0110\u01a1n h\u00e0ng ph\u1ea3i \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi \u0111\u00fang 1 Kh\u00e1ch h\u00e0ng.<\/p>\n

        \ud83d\udd17 Hi\u1ec3u r\u00f5 c\u00e1c m\u1ed1i quan h\u1ec7<\/h2>\n

        C\u00e1c m\u1ed1i quan h\u1ec7 x\u00e1c \u0111\u1ecbnh c\u00e1ch c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. Trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, ch\u00fang c\u1ee5 th\u1ec3 h\u01a1n so v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ph\u00e2n t\u00edch c\u00e1c lo\u1ea1i m\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn m\u00e0 b\u1ea1n s\u1ebd g\u1eb7p.<\/p>\n

          \n
        • Li\u00ean k\u1ebft:<\/strong> M\u1ed9t m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac n\u01a1i c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi nhau. \u0110i\u1ec1u n\u00e0y ng\u1ee5 \u00fd r\u1eb1ng m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng bi\u1ebft \u0111\u1ebfn \u0111\u1ed1i t\u01b0\u1ee3ng kia. Trong s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng, \u0111\u00e2y l\u00e0 m\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n. V\u00ed d\u1ee5: M\u1ed9t T\u00e0i x\u1ebf \u0111i\u1ec1u khi\u1ec3n m\u1ed9t Xe h\u01a1i.<\/li>\n
        • B\u1ed9 ph\u1eadn:<\/strong>M\u1ed1i quan h\u1ec7 to\u00e0n b\u1ed9-ph\u1ea7n, trong \u0111\u00f3 ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n b\u1ed9. V\u1ec1 m\u1eb7t tr\u1ef1c quan, th\u01b0\u1eddng l\u00e0 h\u00ecnh thoi \u1edf \u0111\u1ea7u to\u00e0n b\u1ed9. V\u00ed d\u1ee5: M\u1ed9t Ph\u00f2ng ban c\u00f3 Nh\u00e2n vi\u00ean, nh\u01b0ng Nh\u00e2n vi\u00ean v\u1eabn t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n Ph\u00f2ng ban.<\/li>\n
        • Th\u00e0nh ph\u1ea7n:<\/strong>M\u1ed9t d\u1ea1ng m\u1ea1nh h\u01a1n c\u1ee7a b\u1ed9 ph\u1eadn, trong \u0111\u00f3 ph\u1ea7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n b\u1ed9. N\u1ebfu to\u00e0n b\u1ed9 b\u1ecb h\u1ee7y, ph\u1ea7n c\u0169ng b\u1ecb h\u1ee7y. V\u1ec1 m\u1eb7t tr\u1ef1c quan, \u0111\u00e2y l\u00e0 h\u00ecnh thoi \u0111\u01b0\u1ee3c t\u00f4 \u0111\u1ea7y. V\u00ed d\u1ee5: M\u1ed9t Ng\u00f4i nh\u00e0 c\u00f3 Ph\u00f2ng. N\u1ebfu Ng\u00f4i nh\u00e0 bi\u1ebfn m\u1ea5t, c\u00e1c Ph\u00f2ng c\u0169ng bi\u1ebfn m\u1ea5t.<\/li>\n
        • T\u1ed5ng qu\u00e1t h\u00f3a:<\/strong>K\u1ebf th\u1eeba. M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng l\u1edbp con c\u0169ng l\u00e0 m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbp cha. V\u1ec1 m\u1eb7t tr\u1ef1c quan, m\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng c\u00f3 h\u00ecnh tam gi\u00e1c r\u1ed7ng ch\u1ec9 v\u1ec1 l\u1edbp cha. V\u00ed d\u1ee5: M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng Ch\u00f3 c\u0169ng l\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0110\u1ed9ng v\u1eadt c\u00f3 v\u00fa.<\/li>\n<\/ul>\n

          \u2696\ufe0f S\u01a1 \u0111\u1ed3 \u0110\u1ed1i t\u01b0\u1ee3ng so v\u1edbi S\u01a1 \u0111\u1ed3 L\u1edbp<\/h2>\n

          R\u1ea5t ph\u1ed5 bi\u1ebfn khi nh\u1ea7m l\u1eabn s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng v\u1edbi s\u01a1 \u0111\u1ed3 l\u1edbp. C\u1ea3 hai \u0111\u1ec1u s\u1eed d\u1ee5ng c\u00e1c h\u00ecnh d\u1ea1ng t\u01b0\u01a1ng t\u1ef1, nh\u01b0ng m\u1ee5c \u0111\u00edch v\u00e0 n\u1ed9i dung c\u1ee7a ch\u00fang kh\u00e1c nhau \u0111\u00e1ng k\u1ec3. Hi\u1ec3u \u0111\u01b0\u1ee3c s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y gi\u00fap tr\u00e1nh hi\u1ec3u sai ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng.<\/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 \u0110\u1ed1i t\u01b0\u1ee3ng<\/th>\n<\/tr>\n<\/thead>\n
          Tr\u1ecdng t\u00e2m<\/td>\nC\u1ea5u tr\u00fac chung v\u00e0 quy t\u1eafc<\/td>\nC\u00e1c th\u1ec3 hi\u1ec7n c\u1ee5 th\u1ec3 v\u00e0 d\u1eef li\u1ec7u<\/td>\n<\/tr>\n
          N\u1ed9i dung<\/td>\nT\u00ean l\u1edbp, ph\u01b0\u01a1ng th\u1ee9c, thu\u1ed9c t\u00ednh<\/td>\nT\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng, gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh<\/td>\n<\/tr>\n
          Th\u1eddi gian<\/td>\nQuy t\u1eafc t\u0129nh, kh\u00f4ng th\u1eddi gian<\/td>\nB\u1ee9c \u1ea3nh ch\u1ee5p t\u1ea1i m\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n
          S\u1eed d\u1ee5ng<\/td>\nGiai \u0111o\u1ea1n thi\u1ebft k\u1ebf, l\u1eadp b\u1ea3n v\u1ebd ph\u00e1c<\/td>\nG\u1ee1 l\u1ed7i, ki\u1ec3m th\u1eed, x\u00e1c th\u1ef1c<\/td>\n<\/tr>\n
          \u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/td>\nT\u1ed5ng quan c\u1ea5p cao<\/td>\nTr\u1ea1ng th\u00e1i chi ti\u1ebft, c\u1ee5 th\u1ec3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Khi b\u1ea1n th\u1ea5y m\u1ed9t s\u01a1 \u0111\u1ed3 c\u00f3 k\u00fd hi\u1ec7u ph\u01b0\u01a1ng th\u1ee9c nh\u01b0+getName(): String<\/em>, b\u1ea1n \u0111ang xem m\u1ed9t s\u01a1 \u0111\u1ed3 l\u1edbp. Khi b\u1ea1n th\u1ea5y m\u1ed9t s\u01a1 \u0111\u1ed3 c\u00f3 c\u00e1c gi\u00e1 tr\u1ecb nh\u01b0name: \u201cJohn Doe\u201d<\/em>, b\u1ea1n \u0111ang xem m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y l\u00e0 b\u01b0\u1edbc \u0111\u1ea7u ti\u00ean \u0111\u1ec3 \u0111\u1ecdc ch\u00ednh x\u00e1c.<\/p>\n

          \ud83d\udee0\ufe0f C\u00e1c t\u00ecnh hu\u1ed1ng th\u1ef1c t\u1ebf cho s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng<\/h2>\n

          T\u1ea1i sao ch\u00fang ta t\u1ea1o ra v\u00e0 \u0111\u1ecdc c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y? Ch\u00fang ph\u1ee5c v\u1ee5 c\u00e1c m\u1ee5c \u0111\u00edch th\u1ef1c t\u1ebf trong ph\u00e1t tri\u1ec3n v\u00e0 b\u1ea3o tr\u00ec ph\u1ea7n m\u1ec1m. Hi\u1ec3u \u0111\u01b0\u1ee3c b\u1ed1i c\u1ea3nh s\u1ebd gi\u00fap b\u1ea1n \u0111\u1ecdc v\u1edbi m\u1ee5c \u0111\u00edch \u0111\u00fang \u0111\u1eafn.<\/p>\n

          1. G\u1ee1 l\u1ed7i tr\u1ea1ng th\u00e1i ph\u1ee9c t\u1ea1p<\/h3>\n

          Khi x\u1ea3y ra l\u1ed7i, th\u01b0\u1eddng do tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 gi\u00fap h\u00ecnh dung tr\u1ea1ng th\u00e1i t\u1ea1i th\u1eddi \u0111i\u1ec3m l\u1ed7i x\u1ea3y ra. Thay v\u00ec \u0111o\u00e1n bi\u1ebfn n\u00e0o \u0111ang ch\u1ee9a gi\u00e1 tr\u1ecb g\u00ec, s\u01a1 \u0111\u1ed3 cung c\u1ea5p b\u1ea3n \u0111\u1ed3 r\u00f5 r\u00e0ng v\u1ec1 lu\u1ed3ng d\u1eef li\u1ec7u v\u00e0 c\u00e1c k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng.<\/p>\n

          2. \u0110\u00e1nh gi\u00e1 thi\u1ebft k\u1ebf<\/h3>\n

          Trong qu\u00e1 tr\u00ecnh \u0111\u00e1nh gi\u00e1 thi\u1ebft k\u1ebf, c\u00e1c b\u00ean li\u00ean quan c\u1ea7n th\u1ea5y c\u00e1ch d\u1eef li\u1ec7u s\u1ebd di chuy\u1ec3n. S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng cung c\u1ea5p m\u1ed9t v\u00ed d\u1ee5 c\u1ee5 th\u1ec3 v\u1ec1 m\u1ed9t t\u00ecnh hu\u1ed1ng \u0111i\u1ec3n h\u00ecnh. N\u00f3 gi\u00fap c\u00e1c b\u00ean kh\u00f4ng chuy\u00ean hi\u1ec3u h\u1ec7 th\u1ed1ng b\u1eb1ng c\u00e1ch hi\u1ec3n th\u1ecb c\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 thay v\u00ec c\u00e1c l\u1edbp tr\u1eebu t\u01b0\u1ee3ng.<\/p>\n

          3. X\u00e1c minh l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u<\/h3>\n

          Tr\u01b0\u1edbc khi vi\u1ebft m\u00e3, c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ec3 x\u00e1c minh l\u01b0\u1ee3c \u0111\u1ed3 c\u01a1 s\u1edf d\u1eef li\u1ec7u. B\u1eb1ng c\u00e1ch v\u1ebd ra c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng v\u00e0 c\u00e1c li\u00ean k\u1ebft c\u1ee7a ch\u00fang, c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c kh\u00f3a ngo\u1ea1i v\u00e0 m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a ch\u00ednh x\u00e1c tr\u01b0\u1edbc khi tri\u1ec3n khai b\u1eaft \u0111\u1ea7u.<\/p>\n

          4. T\u00e0i li\u1ec7u v\u00e0 l\u00e0m quen v\u1edbi h\u1ec7 th\u1ed1ng<\/h3>\n

          C\u00e1c th\u00e0nh vi\u00ean m\u1edbi th\u01b0\u1eddng g\u1eb7p kh\u00f3 kh\u0103n khi hi\u1ec3u h\u1ec7 th\u1ed1ng. M\u1ed9t b\u1ed9 s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng minh h\u1ecda c\u00e1c giao d\u1ecbch ch\u00ednh (nh\u01b0 \u201c\u0110\u1eb7t h\u00e0ng\u201d ho\u1eb7c \u201c\u0110\u0103ng nh\u1eadp\u201d) cung c\u1ea5p t\u00e0i li\u1ec7u tham kh\u1ea3o nhanh v\u1ec1 c\u00e1ch d\u1eef li\u1ec7u di chuy\u1ec3n qua \u1ee9ng d\u1ee5ng.<\/p>\n

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

          Ngay c\u1ea3 ng\u01b0\u1eddi \u0111\u1ecdc c\u00f3 kinh nghi\u1ec7m c\u0169ng c\u00f3 th\u1ec3 m\u1eafc b\u1eaby khi di\u1ec5n gi\u1ea3i s\u01a1 \u0111\u1ed3. Bi\u1ebft \u0111\u01b0\u1ee3c nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn n\u00e0y s\u1ebd gi\u00fap b\u1ea1n \u0111\u1ecdc ch\u00ednh x\u00e1c h\u01a1n.<\/p>\n

            \n
          • B\u1ecf qua t\u00ednh \u0111a d\u1ea1ng:<\/strong>Kh\u00f4ng ki\u1ec3m tra c\u00e1c con s\u1ed1 tr\u00ean c\u00e1c li\u00ean k\u1ebft c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn nh\u1eefng gi\u1ea3 \u0111\u1ecbnh sai v\u1ec1 kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u. Lu\u00f4n x\u00e1c minh xem m\u1ed9t li\u00ean k\u1ebft l\u00e0 m\u1ed9t-\u0111\u1ed1i-m\u1ed9t hay m\u1ed9t-\u0111\u1ed1i-nhi\u1ec1u.<\/li>\n
          • Nh\u1ea7m l\u1eabn gi\u1eefa l\u1edbp v\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong>Kh\u00f4ng n\u00ean coi t\u00ean \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 t\u00ean l\u1edbp.customer1<\/em> kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t l\u1edbp; n\u00f3 l\u00e0 m\u1ed9t th\u1ec3 hi\u1ec7n c\u1ee7a l\u1edbpCustomer<\/em> l\u1edbp.<\/li>\n
          • B\u1ecf qua c\u00e1c gi\u00e1 tr\u1ecb null:<\/strong> M\u1ed9t h\u1ed9p thu\u1ed9c t\u00ednh tr\u1ed1ng kh\u00f4ng c\u00f3 ngh\u0129a l\u00e0 thu\u1ed9c t\u00ednh \u0111\u00f3 kh\u00f4ng t\u1ed3n t\u1ea1i. N\u00f3 c\u00f3 ngh\u0129a l\u00e0 gi\u00e1 tr\u1ecb hi\u1ec7n t\u1ea1i \u0111ang l\u00e0 null ho\u1eb7c ch\u01b0a \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c ki\u1ec3m tra logic.<\/li>\n
          • Thi\u1ebfu nh\u00e3n tr\u00ean c\u00e1c li\u00ean k\u1ebft:<\/strong> M\u1ed9t \u0111\u01b0\u1eddng n\u1ed1i kh\u00f4ng c\u00f3 nh\u00e3n l\u00e0 m\u01a1 h\u1ed3. H\u00e3y c\u1ed1 g\u1eafng suy ra m\u1ed1i quan h\u1ec7 t\u1eeb ng\u1eef c\u1ea3nh, nh\u01b0ng h\u00e3y l\u01b0u \u00fd r\u1eb1ng s\u01a1 \u0111\u1ed3 c\u00f3 th\u1ec3 ch\u01b0a ho\u00e0n ch\u1ec9nh.<\/li>\n
          • Gi\u1ea3 \u0111\u1ecbnh h\u00e0nh vi \u0111\u1ed9ng:<\/strong> S\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 t\u0129nh. Ch\u00fang kh\u00f4ng th\u1ec3 hi\u1ec7n h\u00e0nh vi hay ph\u01b0\u01a1ng th\u1ee9c. \u0110\u1eebng c\u1ed1 suy lu\u1eadn logic m\u00e3 ngu\u1ed3n ch\u1ec9 t\u1eeb s\u01a1 \u0111\u1ed3.<\/li>\n<\/ul>\n

            \u2705 C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho tr\u1ef1c quan h\u00f3a<\/h2>\n

            Vi\u1ec7c t\u1ea1o v\u00e0 \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 \u0111\u00f2i h\u1ecfi tu\u00e2n th\u1ee7 m\u1ed9t s\u1ed1 th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t. Nh\u1eefng h\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00ednh r\u00f5 r\u00e0ng v\u00e0 nh\u1ea5t qu\u00e1n trong t\u00e0i li\u1ec7u.<\/p>\n

              \n
            • \u0110\u1eb7t t\u00ean nh\u1ea5t qu\u00e1n:<\/strong> S\u1eed d\u1ee5ng t\u00ean r\u00f5 r\u00e0ng, m\u00f4 t\u1ea3 cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng. Tr\u00e1nh d\u00f9ng t\u00ean chung chung nh\u01b0 obj1<\/em> ho\u1eb7c obj2<\/em>. S\u1eed d\u1ee5ng order1<\/em> ho\u1eb7c activeUser<\/em> \u0111\u1ec3 cung c\u1ea5p ng\u1eef c\u1ea3nh.<\/li>\n
            • B\u1ed1 c\u1ee5c h\u1ee3p l\u00fd:<\/strong> S\u1eafp x\u1ebfp c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd. Gom c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan l\u1ea1i v\u1edbi nhau. S\u1eed d\u1ee5ng kho\u1ea3ng tr\u1ed1ng \u0111\u1ec3 t\u00e1ch bi\u1ec7t c\u00e1c c\u1ee5m d\u1eef li\u1ec7u ri\u00eang bi\u1ec7t.<\/li>\n
            • K\u00fd hi\u1ec7u chu\u1ea9n:<\/strong> Lu\u00f4n s\u1eed d\u1ee5ng k\u00fd hi\u1ec7u UML chu\u1ea9n. Vi\u1ec7c l\u1ec7ch kh\u1ecfi c\u00e1c k\u00fd hi\u1ec7u chu\u1ea9n c\u00f3 th\u1ec3 g\u00e2y nh\u1ea7m l\u1eabn cho ng\u01b0\u1eddi \u0111\u1ecdc quen v\u1edbi c\u00e1c quy \u01b0\u1edbc.<\/li>\n
            • T\u1eadp trung v\u00e0o c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ch\u00ednh:<\/strong> \u0110\u1eebng c\u1ed1 g\u1eafng bi\u1ec3u di\u1ec5n to\u00e0n b\u1ed9 h\u1ec7 th\u1ed1ng trong m\u1ed9t c\u00e1i nh\u00ecn. Chia nh\u1ecf th\u00e0nh c\u00e1c s\u01a1 \u0111\u1ed3 c\u1ee5 th\u1ec3 theo tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng. T\u1eadp trung v\u00e0o c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng li\u00ean quan \u0111\u1ebfn t\u00ecnh hu\u1ed1ng \u0111ang \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3.<\/li>\n
            • C\u1eadp nh\u1eadt \u0111\u1ecbnh k\u1ef3:<\/strong> N\u1ebfu s\u01a1 \u0111\u1ed3 \u0111\u1ea1i di\u1ec7n cho tr\u1ea1ng th\u00e1i th\u1ef1c t\u1ebf, h\u00e3y \u0111\u1ea3m b\u1ea3o n\u00f3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt. M\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng l\u1ed7i th\u1eddi c\u00f3 th\u1ec3 g\u00e2y nh\u1ea7m l\u1eabn h\u01a1n l\u00e0 h\u1eefu \u00edch.<\/li>\n<\/ul>\n

              \ud83e\udde0 Kh\u00e1m ph\u00e1 s\u00e2u: Gi\u1ea3i th\u00edch c\u00e1c gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh<\/h2>\n

              Ph\u1ea7n d\u01b0\u1edbi c\u00f9ng c\u1ee7a h\u00ecnh ch\u1eef nh\u1eadt \u0111\u1ed1i t\u01b0\u1ee3ng th\u01b0\u1eddng l\u00e0 ph\u1ea7n mang th\u00f4ng tin nh\u1ea5t. N\u00f3 ch\u1ee9a d\u1eef li\u1ec7u th\u1ef1c t\u1ebf. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1ch b\u1ea1n c\u00f3 th\u1ec3 hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 n\u00f3.<\/p>\n

                \n
              • Ki\u1ec3u d\u1eef li\u1ec7u:<\/strong> L\u01b0u \u00fd s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa chu\u1ed7i, s\u1ed1 nguy\u00ean v\u00e0 ki\u1ec3u logic. M\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a true<\/em> cho th\u1ea5y c\u1edd \u0111ang ho\u1ea1t \u0111\u1ed9ng. M\u1ed9t gi\u00e1 tr\u1ecb c\u1ee7a 0<\/em> c\u00f3 th\u1ec3 ch\u1ec9 ra m\u1ed9t con s\u1ed1 \u0111\u1ebfm ho\u1eb7c m\u1ed9t ID.<\/li>\n
              • Tham chi\u1ebfu:<\/strong> \u0110\u00f4i khi, gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh l\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00e1c. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n d\u01b0\u1edbi d\u1ea1ng tham chi\u1ebfu (v\u00ed d\u1ee5, customer: customer1<\/em>). \u0110i\u1ec1u n\u00e0y cho th\u1ea5y m\u1ed9t li\u00ean k\u1ebft tr\u1ef1c ti\u1ebfp \u0111\u1ebfn m\u1ed9t th\u1ec3 hi\u1ec7n kh\u00e1c trong s\u01a1 \u0111\u1ed3.<\/li>\n
              • \u0110\u1ed1i t\u01b0\u1ee3ng ph\u1ee9c t\u1ea1p:<\/strong> M\u1ed9t s\u1ed1 \u0111\u1ed1i t\u01b0\u1ee3ng ch\u1ee9a c\u00e1c c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ph\u1ee9c t\u1ea1p. Trong s\u01a1 \u0111\u1ed3, ch\u00fang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n d\u01b0\u1edbi d\u1ea1ng c\u00e1c h\u1ed9p l\u1ed3ng nhau ho\u1eb7c \u0111\u01a1n gi\u1ea3n h\u00f3a th\u00e0nh m\u1ed9t gi\u00e1 tr\u1ecb duy nh\u1ea5t t\u00f9y thu\u1ed9c v\u00e0o m\u1ee9c \u0111\u1ed9 chi ti\u1ebft c\u1ea7n thi\u1ebft.<\/li>\n
              • Lo\u1ea1i t\u1eadp h\u1ee3p:<\/strong>Danh s\u00e1ch ho\u1eb7c m\u1ea3ng l\u00e0 ph\u1ed5 bi\u1ebfn. M\u1ed9t gi\u00e1 tr\u1ecb nh\u01b0[“item1”, “item2”]<\/em> cho th\u1ea5y m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c m\u1ee5c li\u00ean quan \u0111\u1ebfn \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3.<\/li>\n<\/ul>\n

                \ud83d\ude80 K\u1ef9 thu\u1eadt \u0111\u1ecdc n\u00e2ng cao<\/h2>\n

                M\u1ed9t khi b\u1ea1n \u0111\u00e3 quen thu\u1ed9c v\u1edbi c\u00e1c kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n, b\u1ea1n c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt n\u00e2ng cao h\u01a1n \u0111\u1ec3 ph\u00e2n t\u00edch h\u00e0nh vi v\u00e0 t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

                Theo d\u00f5i lu\u1ed3ng d\u1eef li\u1ec7u<\/h3>\n

                Theo d\u00f5i m\u1ed9t chu\u1ed7i li\u00ean k\u1ebft \u0111\u1ec3 xem d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c lan truy\u1ec1n nh\u01b0 th\u1ebf n\u00e0o. B\u1eaft \u0111\u1ea7u t\u1eeb m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea7u v\u00e0o ng\u01b0\u1eddi d\u00f9ng v\u00e0 theo d\u00f5i c\u00e1c li\u00ean k\u1ebft qua h\u1ec7 th\u1ed1ng \u0111\u1ebfn \u0111\u1ed1i t\u01b0\u1ee3ng c\u01a1 s\u1edf d\u1eef li\u1ec7u. \u0110i\u1ec1u n\u00e0y gi\u00fap hi\u1ec3u r\u00f5 h\u00e0nh tr\u00ecnh c\u1ee7a d\u1eef li\u1ec7u qua \u1ee9ng d\u1ee5ng.<\/p>\n

                X\u00e1c \u0111\u1ecbnh c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng m\u1ed3 c\u00f4i<\/h3>\n

                T\u00ecm ki\u1ebfm c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng kh\u00f4ng \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi b\u1ea5t k\u1ef3 th\u1ee9 g\u00ec. Nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 “\u0111\u1ed1i t\u01b0\u1ee3ng m\u1ed3 c\u00f4i”. Ch\u00fang c\u00f3 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho d\u1eef li\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ea1o nh\u01b0ng ch\u01b0a \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi \u0111\u1ed1i t\u01b0\u1ee3ng cha. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a l\u1ed7i logic trong thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng.<\/p>\n

                X\u00e1c minh c\u00e1c r\u00e0ng bu\u1ed9c<\/h3>\n

                Ki\u1ec3m tra xem s\u01a1 \u0111\u1ed3 c\u00f3 vi ph\u1ea1m b\u1ea5t k\u1ef3 r\u00e0ng bu\u1ed9c n\u00e0o kh\u00f4ng. V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t li\u00ean k\u1ebft y\u00eau c\u1ea7u m\u1ed9t vai tr\u00f2 c\u1ee5 th\u1ec3, h\u00e3y \u0111\u1ea3m b\u1ea3o \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u00f3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u \u0111\u00f3. N\u1ebfu b\u1ed9i s\u1ed1 n\u00f3i “t\u1ed1i \u0111a m\u1ed9t”, h\u00e3y \u0111\u1ea3m b\u1ea3o kh\u00f4ng c\u00f3 \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0o c\u00f3 nhi\u1ec1u li\u00ean k\u1ebft theo h\u01b0\u1edbng \u0111\u00f3.<\/p>\n

                \ud83d\udcdd Nh\u1eefng suy ngh\u0129 cu\u1ed1i c\u00f9ng<\/h2>\n

                Tr\u00ed tu\u1ec7 tr\u1ef1c quan trong thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m l\u00e0 m\u1ed9t k\u1ef9 n\u0103ng \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n qua th\u1ef1c h\u00e0nh. Vi\u1ec7c \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng gi\u00fap b\u1ea1n nh\u00ecn th\u1ea5y c\u1ea5u tr\u00fac v\u00f4 h\u00ecnh c\u1ee7a \u1ee9ng d\u1ee5ng c\u1ee7a m\u00ecnh. N\u00f3 c\u1ea7u n\u1ed1i kho\u1ea3ng c\u00e1ch gi\u1eefa m\u00e3 h\u00f3a tr\u1eebu t\u01b0\u1ee3ng v\u00e0 th\u1ef1c t\u1ebf c\u1ee5 th\u1ec3. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 c\u00e1c th\u00e0nh ph\u1ea7n, k\u00fd hi\u1ec7u v\u00e0 m\u1ed1i quan h\u1ec7, b\u1ea1n c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng \u0111i\u1ec1u h\u01b0\u1edbng c\u00e1c h\u1ec7 th\u1ed1ng ph\u1ee9c t\u1ea1p.<\/p>\n

                H\u00e3y nh\u1edb d\u00e0nh th\u1eddi gian cho qu\u00e1 tr\u00ecnh \u0111\u1ecdc. \u0110\u1eebng v\u1ed9i v\u00e0ng. H\u00e3y xem x\u00e9t c\u00e1c th\u1ec3 hi\u1ec7n, ki\u1ec3m tra c\u00e1c gi\u00e1 tr\u1ecb v\u00e0 theo d\u00f5i c\u00e1c li\u00ean k\u1ebft. V\u1edbi th\u1ef1c h\u00e0nh, b\u1ea1n s\u1ebd nh\u1eadn th\u1ea5y nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n t\u1ef1 nhi\u00ean trong quy tr\u00ecnh l\u00e0m vi\u1ec7c c\u1ee7a m\u00ecnh. Ch\u00fang l\u00e0 c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd cho giao ti\u1ebfp, g\u1ee1 l\u1ed7i v\u00e0 thi\u1ebft k\u1ebf. H\u00e3y s\u1eed d\u1ee5ng ch\u00fang \u0111\u1ec3 l\u00e0m r\u00f5 suy ngh\u0129 c\u1ee7a b\u1ea1n v\u00e0 chia s\u1ebb t\u1ea7m nh\u00ecn c\u1ee7a m\u00ecnh v\u1edbi ng\u01b0\u1eddi kh\u00e1c.<\/p>\n

                H\u00e3y ghi nh\u1edb nh\u1eefng l\u1eddi khuy\u00ean n\u00e0y khi b\u1ea1n ti\u1ebfp t\u1ee5c kh\u00e1m ph\u00e1 ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng. Kh\u1ea3 n\u0103ng hi\u1ec3u ch\u00ednh x\u00e1c nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y s\u1ebd gi\u00fap b\u1ea1n tr\u1edf th\u00e0nh m\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n hi\u1ec7u qu\u1ea3 h\u01a1n v\u00e0 m\u1ed9t th\u00e0nh vi\u00ean c\u00f3 gi\u00e1 tr\u1ecb h\u01a1n trong nh\u00f3m. B\u1eaft \u0111\u1ea7u b\u1eb1ng nh\u1eefng s\u01a1 \u0111\u1ed3 \u0111\u01a1n gi\u1ea3n v\u00e0 d\u1ea7n chuy\u1ec3n sang c\u00e1c c\u1ea5u tr\u00fac ph\u1ee9c t\u1ea1p h\u01a1n. H\u00e0nh tr\u00ecnh chinh ph\u1ee5c th\u00e0nh th\u1ea1o b\u1eaft \u0111\u1ea7u t\u1eeb vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c kh\u00e1i ni\u1ec7m c\u01a1 b\u1ea3n.<\/p>\n","protected":false},"excerpt":{"rendered":"

                \ud83d\udc4b Gi\u1edbi thi\u1ec7u v\u1ec1 n\u0103ng l\u1ef1c tr\u1ef1c quan trong thi\u1ebft k\u1ebf ph\u1ea7n m\u1ec1m Trong b\u1ed1i c\u1ea3nh ph\u1ee9c t\u1ea1p c\u1ee7a ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m, vi\u1ec7c hi\u1ec3u c\u1ea5u tr\u00fac t\u0129nh c\u1ee7a m\u1ed9t…<\/p>\n","protected":false},"author":1,"featured_media":1492,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u1ecdc m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng: H\u01b0\u1edbng d\u1eabn d\u00e0nh cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch \u0111\u1ecdc s\u01a1 \u0111\u1ed3 \u0111\u1ed1i t\u01b0\u1ee3ng nh\u01b0 m\u1ed9t chuy\u00ean gia. 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