{"id":877,"date":"2026-03-24T04:35:59","date_gmt":"2026-03-24T04:35:59","guid":{"rendered":"https:\/\/www.visualize-ai.com\/vi\/interactive-tutorial-creating-first-object-oriented-class-diagram\/"},"modified":"2026-03-24T04:35:59","modified_gmt":"2026-03-24T04:35:59","slug":"interactive-tutorial-creating-first-object-oriented-class-diagram","status":"publish","type":"post","link":"https:\/\/www.visualize-ai.com\/vi\/interactive-tutorial-creating-first-object-oriented-class-diagram\/","title":{"rendered":"H\u01b0\u1edbng d\u1eabn T\u01b0\u01a1ng t\u00e1c: T\u1ea1o s\u01a1 \u0111\u1ed3 L\u1edbp H\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \u0110\u1ea7u ti\u00ean c\u1ee7a B\u1ea1n"},"content":{"rendered":"

Trong th\u1ebf gi\u1edbi ph\u1ee9c t\u1ea1p c\u1ee7a ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m, vi\u1ec7c l\u1eadp k\u1ebf ho\u1ea1ch th\u01b0\u1eddng l\u00e0 y\u1ebfu t\u1ed1 ph\u00e2n bi\u1ec7t gi\u1eefa m\u1ed9t \u1ee9ng d\u1ee5ng \u1ed5n \u0111\u1ecbnh v\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng mong manh. Tr\u01b0\u1edbc khi vi\u1ebft b\u1ea5t k\u1ef3 d\u00f2ng m\u00e3 th\u1ef1c thi n\u00e0o, c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 v\u00e0 nh\u00e0 ph\u00e1t tri\u1ec3n \u0111\u1ec1u d\u1ef1a v\u00e0o b\u1ea3n v\u1ebd tr\u1ef1c quan \u0111\u1ec3 l\u1eadp b\u1ea3n \u0111\u1ed3 c\u1ea5u tr\u00fac ph\u1ea7n m\u1ec1m c\u1ee7a h\u1ecd. M\u1ed9t trong nh\u1eefng c\u00f4ng c\u1ee5 quan tr\u1ecdng nh\u1ea5t trong qu\u00e1 tr\u00ecnh n\u00e0y l\u00e0s\u01a1 \u0111\u1ed3 l\u1edbp h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng<\/strong>. Nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y cung c\u1ea5p c\u00e1i nh\u00ecn t\u0129nh v\u1ec1 h\u1ec7 th\u1ed1ng, chi ti\u1ebft c\u00e1c l\u1edbp, thu\u1ed9c t\u00ednh, ph\u01b0\u01a1ng th\u1ee9c v\u00e0 c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ee9c t\u1ea1p k\u1ebft n\u1ed1i ch\u00fang l\u1ea1i v\u1edbi nhau.<\/p>\n

D\u00f9 b\u1ea1n l\u00e0 m\u1ed9t nh\u00e0 ph\u00e2n t\u00edch h\u1ec7 th\u1ed1ng \u0111ang n\u1ed7 l\u1ef1c hay m\u1ed9t nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 kinh nghi\u1ec7m \u0111ang ho\u00e0n thi\u1ec7n k\u1ef9 n\u0103ng, vi\u1ec7c hi\u1ec3u c\u00e1ch x\u00e2y d\u1ef1ng nh\u1eefng s\u01a1 \u0111\u1ed3 n\u00e0y l\u00e0 \u0111i\u1ec1u thi\u1ebft y\u1ebfu. H\u01b0\u1edbng d\u1eabn n\u00e0y s\u1ebd d\u1eabn b\u1ea1n qua quy tr\u00ecnh thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 l\u1edbp h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng \u0111\u1ea7u ti\u00ean c\u1ee7a b\u1ea1n b\u1eb1ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p m\u00f4 h\u00ecnh h\u00f3a chu\u1ea9n. Ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 c\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i, ng\u1eef ngh\u0129a c\u1ee7a c\u00e1c m\u1ed1i quan h\u1ec7, v\u00e0 quy tr\u00ecnh t\u1eebng b\u01b0\u1edbc c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u1ea1o ra m\u1ed9t thi\u1ebft k\u1ebf v\u1eefng ch\u1eafc.<\/p>\n

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\"Hand-drawn<\/figure>\n<\/div>\n

Hi\u1ec3u c\u00e1c Kh\u1ed1i X\u00e2y d\u1ef1ng c\u1ee7a S\u01a1 \u0111\u1ed3 L\u1edbp \ud83e\uddf1<\/h2>\n

Tr\u01b0\u1edbc khi v\u1ebd c\u00e1c \u0111\u01b0\u1eddng v\u00e0 h\u00ecnh h\u1ed9p, b\u1ea1n ph\u1ea3i hi\u1ec3u m\u1ed7i h\u00ecnh d\u1ea1ng \u0111\u1ea1i di\u1ec7n cho \u0111i\u1ec1u g\u00ec. S\u01a1 \u0111\u1ed3 l\u1edbp kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t b\u1ea3n v\u1ebd; n\u00f3 l\u00e0 m\u1ed9t b\u1ea3n m\u00f4 t\u1ea3 v\u1ec1 d\u1eef li\u1ec7u v\u00e0 h\u00e0nh vi c\u1ee7a h\u1ec7 th\u1ed1ng. Y\u1ebfu t\u1ed1 ch\u00ednh l\u00e0l\u1edbp<\/strong>.<\/p>\n

C\u1ea5u tr\u00fac L\u1edbp<\/h3>\n

V\u1ec1 m\u1eb7t tr\u1ef1c quan, m\u1ed9t l\u1edbp \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u00ecnh ch\u1eef nh\u1eadt chia th\u00e0nh ba ng\u0103n. C\u1ea5u tr\u00fac n\u00e0y cho ph\u00e9p b\u1ea1n t\u1ed5 ch\u1ee9c th\u00f4ng tin m\u1ed9t c\u00e1ch h\u1ee3p l\u00fd:<\/p>\n

    \n
  • Ng\u0103n Tr\u00ean:<\/strong>Ch\u1ee9a t\u00ean c\u1ee7a l\u1edbp. \u0110i\u1ec1u n\u00e0y n\u00ean l\u00e0 m\u1ed9t danh t\u1eeb, v\u00ed d\u1ee5 nh\u01b0Kh\u00e1ch h\u00e0ng<\/em>, H\u00f3a \u0111\u01a1n<\/em>, ho\u1eb7cS\u1ea3n ph\u1ea9m<\/em>.<\/li>\n
  • Ng\u0103n Gi\u1eefa:<\/strong>Li\u1ec7t k\u00ea c\u00e1c thu\u1ed9c t\u00ednh (t\u00ednh ch\u1ea5t) c\u1ee7a l\u1edbp. Nh\u1eefng thu\u1ed9c t\u00ednh n\u00e0y m\u00f4 t\u1ea3 tr\u1ea1ng th\u00e1i ho\u1eb7c d\u1eef li\u1ec7u m\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang gi\u1eef.<\/li>\n
  • Ng\u0103n D\u01b0\u1edbi:<\/strong>Li\u1ec7t k\u00ea c\u00e1c ph\u01b0\u01a1ng th\u1ee9c (thao t\u00e1c). Nh\u1eefng ph\u01b0\u01a1ng th\u1ee9c n\u00e0y m\u00f4 t\u1ea3 c\u00e1c h\u00e0nh \u0111\u1ed9ng m\u00e0 \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n.<\/li>\n<\/ul>\n

    H\u00e3y xem x\u00e9t m\u1ed9t l\u1edbp \u0111\u01a1n gi\u1ea3nT\u00e0i kho\u1ea3n Ng\u00e2n h\u00e0ng<\/em> l\u1edbp. C\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 bao g\u1ed3ms\u1ed1 t\u00e0i kho\u1ea3n<\/em> v\u00e0s\u1ed1 d\u01b0<\/em>. C\u00e1c ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 bao g\u1ed3mdeposit()<\/em> v\u00e0 withdraw()<\/em>. S\u1ef1 t\u00e1ch bi\u1ec7t n\u00e0y \u0111\u1ea3m b\u1ea3o s\u1ef1 r\u00f5 r\u00e0ng gi\u1eefa \u0111i\u1ec1u m\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0<\/em> (d\u1eef li\u1ec7u) v\u00e0 \u0111i\u1ec1u m\u00e0 m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0m<\/em> (h\u00e0nh vi).<\/p>\n

    Thu\u1ed9c t\u00ednh v\u00e0 Ki\u1ec3u D\u1eef li\u1ec7u<\/h3>\n

    Thu\u1ed9c t\u00ednh x\u00e1c \u0111\u1ecbnh c\u00e1c \u0111i\u1ec3m d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 li\u00ean quan \u0111\u1ebfn m\u1ed9t l\u1edbp. Khi t\u00e0i li\u1ec7u h\u00f3a nh\u1eefng thu\u1ed9c t\u00ednh n\u00e0y, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i x\u00e1c \u0111\u1ecbnh ki\u1ec3u d\u1eef li\u1ec7u. V\u00ed d\u1ee5, m\u1ed9t s\u1ed1 nguy\u00ean cho m\u1ed9t s\u1ed1 \u0111\u1ebfm, m\u1ed9t chu\u1ed7i cho m\u1ed9t t\u00ean, ho\u1eb7c m\u1ed9t gi\u00e1 tr\u1ecb logic cho m\u1ed9t c\u1edd tr\u1ea1ng th\u00e1i. Trong m\u1ed9t s\u01a1 \u0111\u1ed3 ch\u00ednh th\u1ee9c, b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y t\u00ean thu\u1ed9c t\u00ednh theo sau b\u1edfi d\u1ea5u hai ch\u1ea5m v\u00e0 ki\u1ec3u d\u1eef li\u1ec7u, ch\u1eb3ng h\u1ea1n nh\u01b0 tu\u1ed5i: Integer<\/em>.<\/p>\n

    H\u01a1n n\u1eefa, b\u1ea1n c\u1ea7n xem x\u00e9t ph\u1ea1m vi c\u1ee7a c\u00e1c thu\u1ed9c t\u00ednh n\u00e0y. Ch\u00fang c\u00f3 \u0111\u1eb7c th\u00f9 cho m\u1ed9t th\u1ec3 hi\u1ec7n duy nh\u1ea5t hay thu\u1ed9c v\u1ec1 ch\u00ednh l\u1edbp? M\u1eb7c d\u00f9 thu\u1ed9c t\u00ednh t\u0129nh t\u1ed3n t\u1ea1i, nh\u01b0ng \u0111\u1ed1i v\u1edbi s\u01a1 \u0111\u1ed3 d\u00e0nh cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u, vi\u1ec7c t\u1eadp trung v\u00e0o thu\u1ed9c t\u00ednh th\u1ec3 hi\u1ec7n l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u chu\u1ea9n.<\/p>\n

    Ph\u01b0\u01a1ng th\u1ee9c v\u00e0 Thao t\u00e1c<\/h3>\n

    Ph\u01b0\u01a1ng th\u1ee9c l\u00e0 c\u00e1c h\u00e0m thao t\u00e1c v\u1edbi c\u00e1c thu\u1ed9c t\u00ednh c\u1ee7a m\u1ed9t l\u1edbp. Ch\u00fang \u0111\u1ea1i di\u1ec7n cho logic c\u1ee7a h\u1ec7 th\u1ed1ng. Khi \u0111\u1ecbnh ngh\u0129a ph\u01b0\u01a1ng th\u1ee9c, h\u00e3y li\u1ec7t k\u00ea t\u00ean thao t\u00e1c theo sau l\u00e0 tham s\u1ed1 trong d\u1ea5u ngo\u1eb7c \u0111\u01a1n. V\u00ed d\u1ee5, calculateInterest(rate)<\/em>.<\/p>\n

    Gi\u1ed1ng nh\u01b0 thu\u1ed9c t\u00ednh, ph\u01b0\u01a1ng th\u1ee9c c\u0169ng c\u00f3 m\u1ee9c \u0111\u1ed9 hi\u1ec3n th\u1ecb. \u0110i\u1ec1u n\u00e0y ki\u1ec3m so\u00e1t ai c\u00f3 th\u1ec3 truy c\u1eadp ho\u1eb7c thay \u0111\u1ed5i ch\u00fang t\u1eeb b\u00ean ngo\u00e0i l\u1edbp. Ba k\u00fd hi\u1ec7u hi\u1ec3n th\u1ecb ti\u00eau chu\u1ea9n l\u00e0:<\/p>\n

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    • C\u00f4ng khai (+):<\/strong> C\u00f3 th\u1ec3 truy c\u1eadp b\u1edfi b\u1ea5t k\u1ef3 l\u1edbp n\u00e0o kh\u00e1c.<\/li>\n
    • Ri\u00eang t\u01b0 (-):<\/strong> Ch\u1ec9 c\u00f3 th\u1ec3 truy c\u1eadp b\u00ean trong ch\u00ednh l\u1edbp \u0111\u00f3.<\/li>\n
    • B\u1ea3o v\u1ec7 (#):<\/strong> C\u00f3 th\u1ec3 truy c\u1eadp trong l\u1edbp v\u00e0 c\u00e1c l\u1edbp con c\u1ee7a n\u00f3.<\/li>\n<\/ul>\n

      Thi\u1ebft l\u1eadp M\u1ed1i quan h\u1ec7: Nh\u1eefng K\u1ebft n\u1ed1i Quan tr\u1ecdng \ud83d\udd17<\/h2>\n

      S\u01a1 \u0111\u1ed3 l\u1edbp hi\u1ebfm khi ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t t\u1eadp h\u1ee3p c\u00e1c h\u1ed9p t\u00e1ch bi\u1ec7t. S\u1ee9c m\u1ea1nh th\u1ef1c s\u1ef1 c\u1ee7a thi\u1ebft k\u1ebf h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng n\u1eb1m \u1edf c\u00e1ch c\u00e1c l\u1edbp n\u00e0y t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. C\u00e1c m\u1ed1i quan h\u1ec7 x\u00e1c \u0111\u1ecbnh c\u00e1c li\u00ean k\u1ebft gi\u1eefa c\u00e1c l\u1edbp. Vi\u1ec7c hi\u1ec3u sai nh\u1eefng li\u00ean k\u1ebft n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn s\u1ef1 g\u1eafn k\u1ebft ch\u1eb7t ch\u1ebd v\u00e0 kh\u00f3 b\u1ea3o tr\u00ec v\u1ec1 sau.<\/p>\n

      1. Li\u00ean k\u1ebft<\/h3>\n

      M\u1ed9t li\u00ean k\u1ebft \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 c\u1ea5u tr\u00fac n\u01a1i m\u1ed9t l\u1edbp \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t l\u1edbp kh\u00e1c. \u0110i\u1ec1u n\u00e0y ng\u1ee5 \u00fd r\u1eb1ng c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a m\u1ed9t l\u1edbp c\u00f3 tham chi\u1ebfu \u0111\u1ebfn c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng c\u1ee7a l\u1edbp kh\u00e1c. M\u1ed9t \u0111\u01b0\u1eddng th\u1eb3ng \u0111\u01a1n gi\u1ea3n k\u1ebft n\u1ed1i hai l\u1edbp. B\u1ea1n c\u00f3 th\u1ec3 \u0111\u00e1nh nh\u00e3n \u0111\u01b0\u1eddng n\u00e0y \u0111\u1ec3 m\u00f4 t\u1ea3 b\u1ea3n ch\u1ea5t c\u1ee7a li\u00ean k\u1ebft, ch\u1eb3ng h\u1ea1n nh\u01b0 \u201cthu\u00ea m\u01b0\u1edbn\u201d ho\u1eb7c \u201cs\u1edf h\u1eefu\u201d.<\/p>\n

      S\u1ed1 l\u01b0\u1ee3ng (Cardinality) th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh tr\u00ean c\u00e1c li\u00ean k\u1ebft \u0111\u1ec3 cho th\u1ea5y c\u00f3 bao nhi\u00eau \u0111\u1ed1i t\u01b0\u1ee3ng tham gia. V\u00ed d\u1ee5, m\u1ed9t B\u1ed9 ph\u1eadn<\/em> c\u00f3 th\u1ec3 c\u00f3 m\u1ed1i quan h\u1ec7 1-\u0111a v\u1edbi Nh\u00e2n vi\u00ean<\/em>, c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t ph\u00f2ng ban tuy\u1ec3n d\u1ee5ng nhi\u1ec1u nh\u00e2n vi\u00ean.<\/p>\n

      2. T\u00edch h\u1ee3p<\/h3>\n

      T\u00edch h\u1ee3p l\u00e0 m\u1ed9t lo\u1ea1i quan h\u1ec7 c\u1ee5 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 to\u00e0n th\u1ec3-ph\u1ea7n<\/strong> m\u1ed1i quan h\u1ec7. N\u00f3 ng\u1ee5 \u00fd m\u1ed9t m\u1ed1i quan h\u1ec7 c\u00f3-m\u1ed9t<\/em> trong \u0111\u00f3 ph\u1ea7n c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp v\u1edbi to\u00e0n th\u1ec3. N\u1ebfu to\u00e0n th\u1ec3 b\u1ecb ph\u00e1 h\u1ee7y, c\u00e1c ph\u1ea7n v\u1eabn ti\u1ebfp t\u1ee5c t\u1ed3n t\u1ea1i.<\/p>\n

      H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed9t Tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc<\/em> v\u00e0 c\u00e1c Sinh vi\u00ean<\/em>. N\u1ebfu tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc \u0111\u00f3ng c\u1eeda, c\u00e1c sinh vi\u00ean v\u1eabn t\u1ed3n t\u1ea1i nh\u01b0 nh\u1eefng c\u00e1 th\u1ec3 ri\u00eang bi\u1ec7t. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u00ecnh kim c\u01b0\u01a1ng r\u1ed7ng \u1edf ph\u00eda to\u00e0n th\u1ec3 c\u1ee7a \u0111\u01b0\u1eddng n\u1ed1i.<\/p>\n

      3. K\u1ebft h\u1ee3p<\/h3>\n

      K\u1ebft h\u1ee3p l\u00e0 m\u1ed9t d\u1ea1ng m\u1ea1nh h\u01a1n c\u1ee7a t\u00edch h\u1ee3p. N\u00f3 c\u0169ng \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 to\u00e0n th\u1ec3-ph\u1ea7n<\/strong> m\u1ed1i quan h\u1ec7, nh\u01b0ng v\u1edbi s\u1ef1 ph\u1ee5 thu\u1ed9c v\u1ec1 v\u00f2ng \u0111\u1eddi. C\u00e1c ph\u1ea7n kh\u00f4ng th\u1ec3 t\u1ed3n t\u1ea1i n\u1ebfu kh\u00f4ng c\u00f3 to\u00e0n th\u1ec3. N\u1ebfu to\u00e0n th\u1ec3 b\u1ecb ph\u00e1 h\u1ee7y, c\u00e1c ph\u1ea7n c\u0169ng b\u1ecb ph\u00e1 h\u1ee7y theo.<\/p>\n

      H\u00e3y xem x\u00e9t m\u1ed9t Ng\u00f4i nh\u00e0<\/em> v\u00e0 c\u00e1c Ph\u00f2ng<\/em>. N\u1ebfu ng\u00f4i nh\u00e0 b\u1ecb ph\u00e1 b\u1ecf, c\u00e1c ph\u00f2ng s\u1ebd kh\u00f4ng c\u00f2n t\u1ed3n t\u1ea1i trong b\u1ed1i c\u1ea3nh \u0111\u00f3. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng m\u1ed9t h\u00ecnh kim c\u01b0\u01a1ng \u0111\u1ea7y \u1edf ph\u00eda to\u00e0n th\u1ec3 c\u1ee7a \u0111\u01b0\u1eddng n\u1ed1i.<\/p>\n

      4. T\u1ed5ng qu\u00e1t h\u00f3a (K\u1ebf th\u1eeba)<\/h3>\n

      T\u1ed5ng qu\u00e1t h\u00f3a l\u00e0 c\u01a1 ch\u1ebf k\u1ebf th\u1eeba. N\u00f3 cho ph\u00e9p m\u1ed9t l\u1edbp con k\u1ebf th\u1eeba thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c t\u1eeb l\u1edbp cha. \u0110i\u1ec1u n\u00e0y th\u00fac \u0111\u1ea9y vi\u1ec7c t\u00e1i s\u1eed d\u1ee5ng m\u00e3 v\u00e0 thi\u1ebft l\u1eadp m\u1ed9t m\u1ed1i quan h\u1ec7 l\u00e0-m\u1ed9t<\/em> m\u1ed1i quan h\u1ec7. V\u00ed d\u1ee5, m\u1ed9t Xe h\u01a1i<\/em> l\u00e0 m\u1ed9t Ph\u01b0\u01a1ng ti\u1ec7n giao th\u00f4ng<\/em>.<\/p>\n

      V\u1ec1 m\u1eb7t tr\u1ef1c quan, \u0111i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c v\u1ebd b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng li\u1ec1n v\u1edbi \u0111\u1ea7u m\u0169i t\u00ean h\u00ecnh tam gi\u00e1c r\u1ed7ng h\u01b0\u1edbng v\u1ec1 si\u00eau l\u1edbp (cha).<\/p>\n

      5. Ph\u1ee5 thu\u1ed9c<\/h3>\n

      Ph\u1ee5 thu\u1ed9c \u0111\u1ea1i di\u1ec7n cho m\u1ed1i quan h\u1ec7 s\u1eed d\u1ee5ng. M\u1ed9t l\u1edbp ph\u1ee5 thu\u1ed9c v\u00e0o l\u1edbp kh\u00e1c \u0111\u1ec3 th\u1ef1c hi\u1ec7n m\u1ed9t thao t\u00e1c, nh\u01b0ng m\u1ed1i ph\u1ee5 thu\u1ed9c n\u00e0y th\u01b0\u1eddng ch\u1ec9 t\u1ea1m th\u1eddi. V\u00ed d\u1ee5, m\u1ed9t l\u1edbpReportGenerator<\/em> c\u00f3 th\u1ec3 ph\u1ee5 thu\u1ed9c v\u00e0o m\u1ed9t l\u1edbpDatabaseConnection<\/em> ch\u1ec9 trong th\u1eddi gian n\u00f3 \u0111ang t\u1ea1o b\u00e1o c\u00e1o.<\/p>\n

      \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c v\u1ebd b\u1eb1ng m\u1ed9t \u0111\u01b0\u1eddng g\u1ea1ch n\u1ed1i v\u1edbi \u0111\u1ea7u m\u0169i t\u00ean h\u1edf, h\u01b0\u1edbng t\u1eeb l\u1edbp ph\u1ee5 thu\u1ed9c sang l\u1edbp \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng.<\/p>\n

      So s\u00e1nh c\u00e1c m\u1ed1i quan h\u1ec7 ph\u1ed5 bi\u1ebfn<\/h2>\n\n\n\n\n\n\n\n
      Lo\u1ea1i m\u1ed1i quan h\u1ec7<\/strong><\/th>\nK\u00fd hi\u1ec7u<\/strong><\/th>\n\u00dd ngh\u0129a<\/strong><\/th>\nV\u00ed d\u1ee5<\/strong><\/th>\n<\/tr>\n
      Li\u00ean k\u1ebft<\/td>\n\u0110\u01b0\u1eddng li\u1ec1n<\/td>\nLi\u00ean k\u1ebft c\u1ea5u tr\u00fac gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng<\/td>\nGi\u00e1o vi\u00ean d\u1ea1y h\u1ecdc sinh<\/td>\n<\/tr>\n
      T\u1ed5ng h\u1ee3p<\/td>\nH\u00ecnh thoi r\u1ed7ng<\/td>\nTo\u00e0n th\u1ec3-Ph\u1ea7n (\u0110\u1ed9c l\u1eadp)<\/td>\n\u0110\u1ed9i c\u00f3 th\u00e0nh vi\u00ean<\/td>\n<\/tr>\n
      Th\u00e0nh ph\u1ea7n<\/td>\nH\u00ecnh thoi \u0111\u1ea7y<\/td>\nTo\u00e0n th\u1ec3-Ph\u1ea7n (Ph\u1ee5 thu\u1ed9c)<\/td>\n\u0110\u01a1n h\u00e0ng c\u00f3 c\u00e1c m\u1ee5c h\u00e0ng<\/td>\n<\/tr>\n
      T\u1ed5ng qu\u00e1t h\u00f3a<\/td>\nTam gi\u00e1c r\u1ed7ng<\/td>\nK\u1ebf th\u1eeba (L\u00e0 m\u1ed9t)<\/td>\nH\u00f3a \u0111\u01a1n l\u00e0 t\u00e0i li\u1ec7u<\/td>\n<\/tr>\n
      S\u1ef1 ph\u1ee5 thu\u1ed9c<\/td>\n\u0110\u01b0\u1eddng n\u00e9t \u0111\u1ee9t<\/td>\nM\u1ed1i quan h\u1ec7 s\u1eed d\u1ee5ng<\/td>\nD\u1ecbch v\u1ee5 In s\u1eed d\u1ee5ng M\u00e1y in<\/td>\n<\/tr>\n<\/table>\n

      H\u01b0\u1edbng d\u1eabn t\u1eebng b\u01b0\u1edbc \u0111\u1ec3 thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n \ud83d\udee0\ufe0f<\/h2>\n

      B\u00e2y gi\u1edd b\u1ea1n \u0111\u00e3 hi\u1ec3u \u0111\u01b0\u1ee3c t\u1eeb v\u1ef1ng v\u00e0 c\u00e1c k\u00fd hi\u1ec7u, h\u00e3y c\u00f9ng \u0111i qua quy tr\u00ecnh th\u1ef1c t\u1ebf \u0111\u1ec3 t\u1ea1o m\u1ed9t s\u01a1 \u0111\u1ed3 t\u1eeb \u0111\u1ea7u. Quy tr\u00ecnh n\u00e0y \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf nh\u1eb1m \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n v\u00e0 r\u00f5 r\u00e0ng v\u1ec1 m\u1eb7t logic.<\/p>\n

      B\u01b0\u1edbc 1: Ph\u00e2n t\u00edch c\u00e1c y\u00eau c\u1ea7u<\/h3>\n

      B\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1ch \u0111\u1ecdc c\u00e1c y\u00eau c\u1ea7u ch\u1ee9c n\u0103ng ho\u1eb7c m\u00f4 t\u1ea3 tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng. X\u00e1c \u0111\u1ecbnh c\u00e1c danh t\u1eeb v\u00e0 \u0111\u1ed9ng t\u1eeb. Danh t\u1eeb th\u01b0\u1eddng tr\u1edf th\u00e0nh c\u00e1c l\u1edbp, trong khi \u0111\u1ed9ng t\u1eeb th\u01b0\u1eddng tr\u1edf th\u00e0nh c\u00e1c ph\u01b0\u01a1ng th\u1ee9c ho\u1eb7c m\u1ed1i quan h\u1ec7. V\u00ed d\u1ee5, n\u1ebfu m\u1ed9t y\u00eau c\u1ea7u n\u00eau r\u1eb1ng \u201cH\u1ec7 th\u1ed1ng ph\u1ea3i x\u1eed l\u00fd m\u1ed9t kho\u1ea3n thanh to\u00e1n\u201d, c\u00e1c danh t\u1eeb c\u00f3 th\u1ec3 l\u00e0H\u1ec7 th\u1ed1ng<\/em>, Thanh to\u00e1n<\/em>, v\u00e0 Giao d\u1ecbch<\/em>.<\/p>\n

      B\u01b0\u1edbc 2: X\u00e1c \u0111\u1ecbnh c\u00e1c l\u1edbp c\u1ed1t l\u00f5i<\/h3>\n

      Li\u1ec7t k\u00ea c\u00e1c l\u1edbp b\u1ea1n \u0111\u00e3 x\u00e1c \u0111\u1ecbnh. \u0110\u1eebng lo l\u1eafng v\u1ec1 s\u1ef1 ho\u00e0n h\u1ea3o ngay l\u00fac n\u00e0y. Ch\u1ec9 c\u1ea7n \u0111\u1ea3m b\u1ea3o b\u1ea1n c\u00f3 c\u00e1c th\u1ef1c th\u1ec3 ch\u00ednh. Trong m\u1ed9t t\u00ecnh hu\u1ed1ng th\u01b0\u01a1ng m\u1ea1i \u0111i\u1ec7n t\u1eed, b\u1ea1n c\u00f3 th\u1ec3 li\u1ec7t k\u00eaNg\u01b0\u1eddi d\u00f9ng<\/em>, S\u1ea3n ph\u1ea9m<\/em>, \u0110\u01a1n h\u00e0ng<\/em>, v\u00e0 Thanh to\u00e1n<\/em>.<\/p>\n

      B\u01b0\u1edbc 3: X\u00e1c \u0111\u1ecbnh thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c<\/h3>\n

      V\u1edbi m\u1ed7i l\u1edbp, h\u00e3y suy ngh\u0129 v\u1ec1 d\u1eef li\u1ec7u m\u00e0 n\u00f3 c\u1ea7n l\u01b0u tr\u1eef v\u00e0 c\u00e1c h\u00e0nh \u0111\u1ed9ng m\u00e0 n\u00f3 c\u1ea7n th\u1ef1c hi\u1ec7n. H\u00e3y c\u1ee5 th\u1ec3. Thay v\u00ec ch\u1ec9 li\u1ec7t k\u00ead\u1eef li\u1ec7u<\/em>, h\u00e3y li\u1ec7t k\u00eat\u00eanKh\u00e1chH\u00e0ng<\/em> ho\u1eb7c ng\u00e0y\u0110\u1eb7tH\u00e0ng<\/em>. \u0110\u1ed1i v\u1edbi c\u00e1c ph\u01b0\u01a1ng th\u1ee9c, h\u00e3y t\u1eadp trung v\u00e0o giao di\u1ec7n c\u00f4ng khai m\u00e0 c\u00e1c l\u1edbp kh\u00e1c s\u1ebd t\u01b0\u01a1ng t\u00e1c v\u1edbi.<\/p>\n

      B\u01b0\u1edbc 4: Thi\u1ebft l\u1eadp c\u00e1c m\u1ed1i quan h\u1ec7<\/h3>\n

      V\u1ebd c\u00e1c \u0111\u01b0\u1eddng n\u1ed1i gi\u1eefa c\u00e1c l\u1edbp \u0111\u1ec3 bi\u1ec3u di\u1ec5n c\u00e1ch ch\u00fang t\u01b0\u01a1ng t\u00e1c v\u1edbi nhau. H\u00e3y t\u1ef1 h\u1ecfi b\u1ea3n th\u00e2n: M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 th\u1ec3 t\u1ed3n t\u1ea1i m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ed1i t\u01b0\u1ee3ng kia kh\u00f4ng? M\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng c\u00f3 ph\u1ea3i l\u00e0 m\u1ed9t lo\u1ea1i c\u1ee7a \u0111\u1ed1i t\u01b0\u1ee3ng kia kh\u00f4ng? S\u1eed d\u1ee5ng c\u00e1c k\u00fd hi\u1ec7u m\u1ed1i quan h\u1ec7 \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a tr\u01b0\u1edbc \u0111\u00f3 \u0111\u1ec3 m\u00f4 t\u1ea3 ch\u00ednh x\u00e1c b\u1ea3n ch\u1ea5t c\u1ee7a li\u00ean k\u1ebft. Vi\u1ec7c g\u00e1n nh\u1ea7m m\u1ed9t m\u1ed1i quan h\u1ec7 k\u1ebft h\u1ee3p (composition) th\u00e0nh m\u1ed1i quan h\u1ec7 t\u00edch h\u1ee3p (aggregation) l\u00e0 m\u1ed9t l\u1ed7i ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c v\u1ea5n \u0111\u1ec1 qu\u1ea3n l\u00fd b\u1ed9 nh\u1edb trong m\u00e3 ngu\u1ed3n cu\u1ed1i c\u00f9ng.<\/p>\n

      B\u01b0\u1edbc 5: G\u00e1n t\u00ednh kh\u1ea3 ki\u1ebfn v\u00e0 b\u1ed9i s\u1ed1<\/h3>\n

      Th\u00eam k\u00fd hi\u1ec7u +<\/strong>, \u2013<\/strong>, ho\u1eb7c #<\/strong>v\u00e0o c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c c\u1ee7a b\u1ea1n. X\u00e1c \u0111\u1ecbnh b\u1ed9i s\u1ed1 tr\u00ean c\u00e1c \u0111\u01b0\u1eddng m\u1ed1i quan h\u1ec7. M\u1ed9t ng\u01b0\u1eddi d\u00f9ng c\u00f3 m\u1ed9t \u0111\u1ecba ch\u1ec9 hay nhi\u1ec1u \u0111\u1ecba ch\u1ec9? M\u1ed9t s\u1ea3n ph\u1ea9m c\u00f3 th\u1ec3 c\u00f3 0 ho\u1eb7c nhi\u1ec1u \u0111\u00e1nh gi\u00e1? S\u1eed d\u1ee5ng k\u00fd hi\u1ec7u nh\u01b0 1..*<\/em> (m\u1ed9t \u0111\u1ebfn nhi\u1ec1u) ho\u1eb7c 0..1<\/em> (kh\u00f4ng ho\u1eb7c m\u1ed9t).<\/p>\n

      B\u01b0\u1edbc 6: Xem x\u00e9t v\u00e0 tinh ch\u1ec9nh<\/h3>\n

      Khi s\u01a1 \u0111\u1ed3 ho\u00e0n t\u1ea5t, h\u00e3y l\u00f9i l\u1ea1i v\u00e0 xem x\u00e9t l\u1ea1i. S\u01a1 \u0111\u1ed3 c\u00f3 h\u1ee3p l\u00fd kh\u00f4ng? C\u00f3 t\u1ed3n t\u1ea1i c\u00e1c ph\u1ee5 thu\u1ed9c v\u00f2ng l\u1eb7p kh\u00f4ng? S\u01a1 \u0111\u1ed3 c\u00f3 qu\u00e1 ph\u1ee9c t\u1ea1p kh\u00f4ng? H\u00e3y \u0111\u01a1n gi\u1ea3n h\u00f3a khi c\u00f3 th\u1ec3. M\u1ed9t s\u01a1 \u0111\u1ed3 n\u00ean truy\u1ec1n \u0111\u1ea1t \u00fd t\u01b0\u1edfng, ch\u1ee9 kh\u00f4ng n\u00ean g\u00e2y nh\u1ea7m l\u1eabn.<\/p>\n

      C\u00e1c Th\u1ef1c H\u00e0nh T\u1ed1t Nh\u1ea5t cho S\u01a1 \u0110\u1ed3 S\u1ea1ch v\u00e0 Hi\u1ec7u Qu\u1ea3 \ud83c\udfaf<\/h2>\n

      Vi\u1ec7c t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 l\u00e0 d\u1ec5 d\u00e0ng; nh\u01b0ng vi\u1ec7c t\u1ea1o ra m\u1ed9t s\u01a1 \u0111\u1ed3 t\u1ed1t<\/em>y\u00eau c\u1ea7u s\u1ef1 k\u1ef7 lu\u1eadt. H\u00e3y tu\u00e2n theo c\u00e1c h\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00f4ng vi\u1ec7c c\u1ee7a b\u1ea1n v\u1eabn c\u00f3 th\u1ec3 b\u1ea3o tr\u00ec v\u00e0 d\u1ec5 hi\u1ec3u \u0111\u1ed1i v\u1edbi \u0111\u1ed9i nh\u00f3m c\u1ee7a b\u1ea1n.<\/p>\n

        \n
      • Duy tr\u00ec t\u00ean g\u1ecdi nh\u1ea5t qu\u00e1n:<\/strong> S\u1eed d\u1ee5ng quy \u01b0\u1edbc \u0111\u1eb7t t\u00ean chu\u1ea9n. Tr\u00e1nh d\u00f9ng vi\u1ebft t\u1eaft tr\u1eeb khi ch\u00fang \u0111\u01b0\u1ee3c hi\u1ec3u ph\u1ed5 bi\u1ebfn trong \u0111\u1ed9i nh\u00f3m c\u1ee7a b\u1ea1n. D\u00f9ng CamelCase cho t\u00ean l\u1edbp (v\u00ed d\u1ee5, \u0110\u01a1nH\u00e0ngKh\u00e1chH\u00e0ng<\/em>) v\u00e0 camelCase ho\u1eb7c snake_case cho thu\u1ed9c t\u00ednh t\u00f9y theo quy chu\u1ea9n ng\u00f4n ng\u1eef c\u1ee7a b\u1ea1n.<\/li>\n
      • H\u1ea1n ch\u1ebf k\u00edch th\u01b0\u1edbc l\u1edbp:<\/strong> N\u1ebfu m\u1ed9t l\u1edbp c\u00f3 qu\u00e1 nhi\u1ec1u thu\u1ed9c t\u00ednh ho\u1eb7c ph\u01b0\u01a1ng th\u1ee9c, \u0111i\u1ec1u \u0111\u00f3 c\u00f3 th\u1ec3 l\u00e0 d\u1ea5u hi\u1ec7u c\u1ee7a s\u1ef1 h\u1ee3p nh\u1ea5t k\u00e9m. H\u00e3y c\u00e2n nh\u1eafc chia nh\u1ecf n\u00f3 th\u00e0nh c\u00e1c l\u1edbp nh\u1ecf h\u01a1n, t\u1eadp trung h\u01a1n. M\u1ed9t l\u1edbp n\u00ean c\u00f3 l\u00fd t\u01b0\u1edfng l\u00e0 m\u1ed9t tr\u00e1ch nhi\u1ec7m duy nh\u1ea5t.<\/li>\n
      • Tr\u00e1nh s\u1ef1 tr\u00f9ng l\u1eb7p:<\/strong> Kh\u00f4ng l\u1eb7p l\u1ea1i thu\u1ed9c t\u00ednh gi\u1eefa c\u00e1c l\u1edbp tr\u1eeb khi c\u1ea7n thi\u1ebft cho k\u1ebf th\u1eeba. N\u1ebfu hai l\u1edbp chia s\u1ebb d\u1eef li\u1ec7u chung, h\u00e3y c\u00e2n nh\u1eafc tr\u00edch xu\u1ea5t d\u1eef li\u1ec7u \u0111\u00f3 v\u00e0o m\u1ed9t l\u1edbp cha.<\/li>\n
      • S\u1eed d\u1ee5ng c\u00e1c ki\u1ec3u d\u00e1ng \u0111\u1ec3 r\u00f5 r\u00e0ng:<\/strong> N\u1ebfu c\u00f4ng c\u1ee5 m\u00f4 h\u00ecnh h\u00f3a c\u1ee7a b\u1ea1n h\u1ed7 tr\u1ee3, h\u00e3y s\u1eed d\u1ee5ng c\u00e1c ki\u1ec3u d\u00e1ng \u0111\u1ec3 ch\u1ec9 ra c\u00e1c vai tr\u00f2 c\u1ee5 th\u1ec3, ch\u1eb3ng h\u1ea1n nh\u01b0 <>, <>, ho\u1eb7c <>. \u0110i\u1ec1u n\u00e0y th\u00eam gi\u00e1 tr\u1ecb ng\u1eef ngh\u0129a cho s\u01a1 \u0111\u1ed3.<\/abstract><\/interface><\/entity><\/li>\n
      • T\u00e0i li\u1ec7u c\u00e1c r\u00e0ng bu\u1ed9c:<\/strong> N\u1ebfu c\u00f3 c\u00e1c quy t\u1eafc kinh doanh kh\u00f4ng th\u1ec3 bi\u1ec3u di\u1ec5n trong c\u1ea5u tr\u00fac, h\u00e3y s\u1eed d\u1ee5ng ghi ch\u00fa ho\u1eb7c b\u00ecnh lu\u1eadn \u0111\u1ec3 \u0111\u00ednh k\u00e8m ch\u00fang v\u00e0o l\u1edbp ho\u1eb7c m\u1ed1i quan h\u1ec7 li\u00ean quan.<\/li>\n<\/ul>\n

        Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh \u26a0\ufe0f<\/h2>\n

        Ngay c\u1ea3 nh\u1eefng nh\u00e0 thi\u1ebft k\u1ebf c\u00f3 kinh nghi\u1ec7m c\u0169ng c\u00f3 th\u1ec3 sa v\u00e0o b\u1eaby. Vi\u1ec7c nh\u1eadn th\u1ee9c \u0111\u01b0\u1ee3c nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn n\u00e0y s\u1ebd gi\u00fap b\u1ea1n ti\u1ebft ki\u1ec7m th\u1eddi gian trong giai \u0111o\u1ea1n l\u1eadp tr\u00ecnh.<\/p>\n

          \n
        • Qu\u00e1 thi\u1ebft k\u1ebf:<\/strong> \u0110\u1eebng c\u1ed1 g\u1eafng m\u00f4 h\u00ecnh h\u00f3a m\u1ecdi m\u1ed1i quan h\u1ec7 c\u00f3 th\u1ec3 x\u1ea3y ra. H\u00e3y t\u1eadp trung v\u00e0o c\u00e1c y\u00eau c\u1ea7u hi\u1ec7n t\u1ea1i, ch\u1ee9 kh\u00f4ng ph\u1ea3i nh\u1eefng y\u00eau c\u1ea7u t\u01b0\u01a1ng lai gi\u1ea3 \u0111\u1ecbnh. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn s\u01a1 \u0111\u1ed3 kh\u00f3 thay \u0111\u1ed5i v\u1ec1 sau.<\/li>\n
        • Nh\u1ea7m l\u1eabn gi\u1eefa t\u00edch h\u1ee3p v\u00e0 k\u1ebft h\u1ee3p:<\/strong> \u0110\u00e2y l\u00e0 l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t. H\u00e3y nh\u1edb: K\u1ebft h\u1ee3p ng\u1ee5 \u00fd quy\u1ec1n s\u1edf h\u1eefu v\u00e0 ph\u1ee5 thu\u1ed9c v\u00e0o v\u00f2ng \u0111\u1eddi. N\u1ebfu ph\u1ea7n v\u1eabn t\u1ed3n t\u1ea1i khi to\u00e0n b\u1ed9 b\u1ecb h\u1ee7y, th\u00ec \u0111\u00f3 l\u00e0 t\u00edch h\u1ee3p.<\/li>\n
        • B\u1ecf qua b\u1ed9i s\u1ed1:<\/strong> B\u1ecf tr\u1ed1ng b\u1ed9i s\u1ed1 bu\u1ed9c c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n ph\u1ea3i \u0111o\u00e1n. Lu\u00f4n lu\u00f4n x\u00e1c \u0111\u1ecbnh 0..1<\/em>, 1<\/em>, ho\u1eb7c 1..*<\/em>.<\/li>\n
        • B\u1ecf qua t\u00ednh kh\u1ea3 ki\u1ebfn:<\/strong> L\u00e0m cho m\u1ecdi th\u1ee9 \u0111\u1ec1u c\u00f4ng khai s\u1ebd ph\u00e1 v\u1ee1 m\u1ee5c \u0111\u00edch c\u1ee7a \u0111\u00f3ng g\u00f3i. Gi\u1eef d\u1eef li\u1ec7u n\u1ed9i b\u1ed9 \u1edf ch\u1ebf \u0111\u1ed9 ri\u00eang t\u01b0 v\u00e0 ch\u1ec9 c\u00f4ng khai nh\u1eefng g\u00ec c\u1ea7n thi\u1ebft.<\/li>\n
        • Thi\u1ebfu m\u1ed1i quan h\u1ec7:<\/strong> R\u1ea5t th\u01b0\u1eddng xuy\u00ean qu\u00ean m\u1ea5t c\u00e1c m\u1ed1i quan h\u1ec7 hai chi\u1ec1u. N\u1ebfu l\u1edbp A bi\u1ebft v\u1ec1 l\u1edbp B, th\u00ec l\u1edbp B c\u00f3 bi\u1ebft v\u1ec1 l\u1edbp A kh\u00f4ng? \u0110\u1ea3m b\u1ea3o li\u00ean k\u1ebft \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a \u0111\u00fang \u1edf c\u1ea3 hai chi\u1ec1u n\u1ebfu c\u1ea7n thi\u1ebft.<\/li>\n<\/ul>\n

          X\u00e1c minh thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n \ud83e\uddd0<\/h2>\n

          Tr\u01b0\u1edbc khi ho\u00e0n thi\u1ec7n s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n, h\u00e3y th\u1ef1c hi\u1ec7n ki\u1ec3m tra x\u00e1c minh trong \u0111\u1ea7u. Thi\u1ebft k\u1ebf c\u00f3 h\u1ed7 tr\u1ee3 c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ch\u00ednh kh\u00f4ng? N\u1ebfu ng\u01b0\u1eddi d\u00f9ng c\u1ea7n \u201c\u0110\u1eb7t h\u00e0ng\u201d, c\u00e1c l\u1edbp c\u00f3 h\u1ed7 tr\u1ee3 lu\u1ed3ng \u0111\u00f3 kh\u00f4ng? H\u00e3y theo d\u00f5i h\u00e0nh tr\u00ecnh qua s\u01a1 \u0111\u1ed3.<\/p>\n

          Ki\u1ec3m tra c\u00e1c ph\u1ee5 thu\u1ed9c v\u00f2ng l\u1eb7p. N\u1ebfu 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, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 g\u00e2y ra v\u1ea5n \u0111\u1ec1 kh\u1edfi t\u1ea1o. M\u1eb7c d\u00f9 kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng nghi\u00eam tr\u1ecdng, nh\u01b0ng \u0111\u00e2y l\u00e0 d\u1ea5u hi\u1ec7u c\u1ea3nh b\u00e1o r\u1eb1ng thi\u1ebft k\u1ebf c\u00f3 th\u1ec3 c\u1ea7n \u0111\u01b0\u1ee3c t\u00e1i c\u1ea5u tr\u00fac.<\/p>\n

          Danh s\u00e1ch ki\u1ec3m tra x\u00e1c minh<\/h3>\n
            \n
          • \u2610 T\u1ea5t c\u1ea3 t\u00ean l\u1edbp c\u00f3 ph\u1ea3i l\u00e0 danh t\u1eeb v\u00e0 vi\u1ebft hoa kh\u00f4ng?<\/li>\n
          • \u2610 T\u1ea5t c\u1ea3 c\u00e1c thu\u1ed9c t\u00ednh v\u00e0 ph\u01b0\u01a1ng th\u1ee9c c\u00f3 r\u00f5 r\u00e0ng kh\u00f4ng?<\/li>\n
          • \u2610 C\u00e1c m\u1ed1i quan h\u1ec7 c\u00f3 \u0111\u01b0\u1ee3c \u0111\u00e1nh nh\u00e3n v\u1edbi c\u1ea5p \u0111\u1ed9 \u0111\u00fang kh\u00f4ng?<\/li>\n
          • \u2610 C\u00e1c k\u00fd hi\u1ec7u hi\u1ec3n th\u1ecb (+, -, #) c\u00f3 \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng nh\u1ea5t qu\u00e1n kh\u00f4ng?<\/li>\n
          • \u2610 C\u00f3 s\u1ef1 ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng gi\u1eefa k\u1ebf th\u1eeba v\u00e0 s\u1eed d\u1ee5ng kh\u00f4ng?<\/li>\n
          • \u2610 S\u01a1 \u0111\u1ed3 c\u00f3 ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u kinh doanh kh\u00f4ng?<\/li>\n
          • \u2610 S\u01a1 \u0111\u1ed3 c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c m\u00e0 kh\u00f4ng c\u1ea7n ph\u00f3ng to ho\u1eb7c cu\u1ed9n qu\u00e1 m\u1ee9c kh\u00f4ng?<\/li>\n<\/ul>\n

            K\u1ebft lu\u1eadn v\u00e0 C\u00e1c B\u01b0\u1edbc Ti\u1ebfp Theo \ud83d\ude80<\/h2>\n

            Thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 l\u1edbp h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng l\u00e0 k\u1ef9 n\u0103ng n\u1ec1n t\u1ea3ng cho b\u1ea5t k\u1ef3 chuy\u00ean vi\u00ean ph\u1ea7n m\u1ec1m n\u00e0o. N\u00f3 t\u1ea1o ra s\u1ef1 k\u1ebft n\u1ed1i gi\u1eefa c\u00e1c y\u00eau c\u1ea7u tr\u1eebu t\u01b0\u1ee3ng v\u00e0 m\u00e3 c\u1ee5 th\u1ec3. 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 s\u01a1 \u0111\u1ed3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n v\u1ebd thi\u1ebft k\u1ebf \u0111\u00e1ng tin c\u1eady cho qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n.<\/p>\n

            H\u00e3y nh\u1edb r\u1eb1ng s\u01a1 \u0111\u1ed3 l\u00e0 t\u00e0i li\u1ec7u s\u1ed1ng \u0111\u1ed9ng. Khi y\u00eau c\u1ea7u thay \u0111\u1ed5i, s\u01a1 \u0111\u1ed3 c\u1ee7a b\u1ea1n c\u0169ng c\u1ea7n thay \u0111\u1ed5i theo. \u0110\u1eebng coi ch\u00fang l\u00e0 t\u00e0i li\u1ec7u t\u0129nh, \u0111\u01b0\u1ee3c v\u1ebd m\u1ed9t l\u1ea7n r\u1ed3i b\u1ecf qu\u00ean. Vi\u1ec7c c\u1eadp nh\u1eadt th\u01b0\u1eddng xuy\u00ean \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u00e0i li\u1ec7u tr\u1ef1c quan v\u1eabn ph\u1ea3n \u00e1nh \u0111\u00fang th\u1ef1c t\u1ebf c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

            Th\u1ef1c h\u00e0nh l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 th\u00e0nh th\u1ea1o. B\u1eaft \u0111\u1ea7u v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng nh\u1ecf. V\u1ebd s\u01a1 \u0111\u1ed3 m\u1ed9t h\u1ec7 th\u1ed1ng qu\u1ea3n l\u00fd th\u01b0 vi\u1ec7n, m\u1ed9t c\u00f4ng c\u1ee5 theo d\u00f5i nhi\u1ec7m v\u1ee5 \u0111\u01a1n gi\u1ea3n, ho\u1eb7c danh s\u00e1ch t\u1ed3n kho c\u01a1 b\u1ea3n. Khi b\u1ea1n t\u1ef1 tin h\u01a1n, b\u1ea1n c\u00f3 th\u1ec3 \u0111\u1ed1i m\u1eb7t v\u1edbi c\u00e1c ki\u1ebfn tr\u00fac ph\u1ee9c t\u1ea1p h\u01a1n. V\u1edbi s\u1ef1 ki\u00ean nh\u1eabn v\u00e0 ch\u00fa \u00fd \u0111\u1ebfn chi ti\u1ebft, s\u01a1 \u0111\u1ed3 l\u1edbp c\u1ee7a b\u1ea1n s\u1ebd tr\u1edf th\u00e0nh m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd trong b\u1ed9 c\u00f4ng c\u1ee5 thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n.<\/p>\n

            B\u1eaft \u0111\u1ea7u d\u1ef1 \u00e1n ti\u1ebfp theo c\u1ee7a b\u1ea1n b\u1eb1ng b\u00fat v\u00e0 gi\u1ea5y ho\u1eb7c b\u1ea3ng m\u00f4 h\u00ecnh \u01b0a th\u00edch c\u1ee7a b\u1ea1n. V\u1ebd ph\u00e1c th\u1ea3o c\u00e1c l\u1edbp c\u1ee7a b\u1ea1n. X\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i quan h\u1ec7. X\u00e1c minh thi\u1ebft k\u1ebf c\u1ee7a b\u1ea1n. Th\u1eddi gian \u0111\u1ea7u t\u01b0 v\u00e0o l\u1eadp k\u1ebf ho\u1ea1ch ngay b\u00e2y gi\u1edd s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch l\u1edbn v\u1ec1 ch\u1ea5t l\u01b0\u1ee3ng m\u00e3 v\u00e0 kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec trong t\u01b0\u01a1ng lai.<\/p>\n","protected":false},"excerpt":{"rendered":"

            Trong th\u1ebf gi\u1edbi ph\u1ee9c t\u1ea1p c\u1ee7a ph\u00e1t tri\u1ec3n ph\u1ea7n m\u1ec1m, vi\u1ec7c l\u1eadp k\u1ebf ho\u1ea1ch th\u01b0\u1eddng l\u00e0 y\u1ebfu t\u1ed1 ph\u00e2n bi\u1ec7t gi\u1eefa m\u1ed9t \u1ee9ng d\u1ee5ng \u1ed5n \u0111\u1ecbnh v\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng…<\/p>\n","protected":false},"author":1,"featured_media":878,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"H\u01b0\u1edbng d\u1eabn T\u01b0\u01a1ng t\u00e1c: T\u1ea1o S\u01a1 \u0111\u1ed3 L\u1edbp H\u01b0\u1edbng \u0110\u1ed1i T\u01b0\u1ee3ng \u0110\u1ea7u Ti\u00ean C\u1ee7a B\u1ea1n \ud83d\udcca","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch thi\u1ebft k\u1ebf s\u01a1 \u0111\u1ed3 l\u1edbp h\u01b0\u1edbng \u0111\u1ed1i t\u01b0\u1ee3ng. 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