{"id":101020,"date":"2025-03-11T08:24:42","date_gmt":"2025-03-11T04:54:42","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/"},"modified":"2025-03-11T08:24:42","modified_gmt":"2025-03-11T04:54:42","slug":"%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/","title":{"rendered":"\u0631\u0627\u0628\u0637\u0647 JPA Manytoon \u0648 \u0628\u0647 \u0627\u0633\u062a\u0631\u0627\u062a\u0698\u06cc \u0628\u067e\u06cc\u0648\u0646\u062f\u06cc\u062f"},"content":{"rendered":"<div data-article-id=\"2323710\" id=\"article-body\">\n<p>JPA (API \u067e\u0627\u06cc\u062f\u0627\u0631\u06cc \u062c\u0627\u0648\u0627) \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u0648\u0638\u0627\u06cc\u0641 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0631\u0627 \u0628\u0637\u0648\u0631 \u0639\u06cc\u0646\u06cc \u067e\u0631\u062f\u0627\u0632\u0634 \u06a9\u0646\u06cc\u062f. \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644 \u060c \u0628\u0633\u062a\u0647 \u0628\u0647 \u0631\u0627\u0628\u0637\u0647 \u0628\u06cc\u0646 \u0646\u0647\u0627\u062f \u0648 \u0631\u0648\u0634 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u060c \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0639\u0645\u0644\u06a9\u0631\u062f \u0648 \u06cc\u06a9\u067e\u0627\u0631\u0686\u06af\u06cc \u062f\u0627\u062f\u0647 \u0628\u0631\u0646\u0627\u0645\u0647 \u0628\u0633\u06cc\u0627\u0631 \u0645\u062a\u0641\u0627\u0648\u062a \u0628\u0627\u0634\u062f.<\/p>\n<p>\u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 <code>@ManyToOne<\/code> \u0627\u0633\u062a\u0631\u0627\u062a\u0698\u06cc \u067e\u06cc\u0648\u0633\u062a\u0646 JPA \u0648 <code>@JoinColumn<\/code>\u0627\u0632 <code>nullable<\/code> \u0628\u0647 \u062c\u0644\u0648\u0647 \u0647\u0627\u06cc \u062e\u0627\u0635\u06cc\u062a \u062f\u0631 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0646\u06af\u0627\u0647 \u06a9\u0646\u06cc\u062f \u0648 \u0631\u0648\u0634 \u062a\u0646\u0638\u06cc\u0645 \u0628\u0647\u06cc\u0646\u0647 \u0631\u0627 \u0627\u0631\u0627\u0626\u0647 \u062f\u0647\u06cc\u062f.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter-rtl ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#1\" >1<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#%D8%AA%DB%8C%D9%85%DB%8C\" >\u062a\u06cc\u0645\u06cc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#%D9%86%D9%87%D8%A7%D8%AF_%D8%B9%D8%B6%D9%88\" >\u0646\u0647\u0627\u062f \u0639\u0636\u0648<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#2_%D9%88%DB%8C%DA%98%DA%AF%DB%8C_%D9%88%D8%A7%DA%A9%D8%B4%DB%8C_%D8%A8%D9%84%D8%A7%D9%81%D8%A7%D8%B5%D9%84%D9%87_%D8%A8%D8%A7%D8%B1%DA%AF%DB%8C%D8%B1%DB%8C_%D8%AF%D8%B1_%D9%85%D9%82%D8%A7%D8%A8%D9%84_%D8%A8%D8%A7%D8%B1%DA%AF%DB%8C%D8%B1%DB%8C_%D8%AA%D8%A7%D8%AE%DB%8C%D8%B1\" >2. \u0648\u06cc\u0698\u06af\u06cc \u0648\u0627\u06a9\u0634\u06cc: \u0628\u0644\u0627\u0641\u0627\u0635\u0644\u0647 \u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u062f\u0631 \u0645\u0642\u0627\u0628\u0644. \u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u062a\u0627\u062e\u06cc\u0631<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#3_%D8%AE%D8%B5%D9%88%D8%B5%DB%8C%D8%A7%D8%AA_%D9%82%D8%A7%D8%A8%D9%84_%D8%AA%D9%87%DB%8C_NULL_%D8%A7%D8%AC%D8%A7%D8%B2%D9%87_%D9%88_%D8%A7%D8%B3%D8%AA%D8%B1%D8%A7%D8%AA%DA%98%DB%8C_%D9%BE%DB%8C%D9%88%D8%B3%D8%AA%D9%86\" >3. \u062e\u0635\u0648\u0635\u06cc\u0627\u062a \u0642\u0627\u0628\u0644 \u062a\u0647\u06cc: NULL \u0627\u062c\u0627\u0632\u0647 \u0648 \u0627\u0633\u062a\u0631\u0627\u062a\u0698\u06cc \u067e\u06cc\u0648\u0633\u062a\u0646<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#%D8%AA%D8%BA%DB%8C%DB%8C%D8%B1_%D8%AF%D8%B1_%D8%B1%D9%88%D8%B4_%D9%BE%DB%8C%D9%88%D8%B3%D8%AA%D9%86_%D8%A8%D8%A7_%D8%AA%D9%88%D8%AC%D9%87_%D8%A8%D9%87_%D8%A7%DB%8C%D9%86%DA%A9%D9%87_%D8%A2%DB%8C%D8%A7_%D8%AA%D9%87%DB%8C_%D8%A7%D8%AC%D8%A7%D8%B2%D9%87_%D9%85%DB%8C_%D8%AF%D9%87%D8%AF\" >\u062a\u063a\u06cc\u06cc\u0631 \u062f\u0631 \u0631\u0648\u0634 \u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0627 \u062a\u0648\u062c\u0647 \u0628\u0647 \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u062a\u0647\u06cc \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc \u062f\u0647\u062f<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#4\" >4.<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#EAGER_NULLABLE_TRUE_%D9%BE%DB%8C%D9%88%D8%B3%D8%AA%D9%86_%D8%A8%D9%87_%D8%A8%DB%8C%D8%B1%D9%88%D9%86%DB%8C_%DA%86%D9%BE\" >EAGER + NULLABLE = TRUE (\u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u0628\u06cc\u0631\u0648\u0646\u06cc \u0686\u067e)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#Eage_nullable_false_inner_join\" >Eage + nullable = false (inner join)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#%D8%AA%D9%86%D8%A8%D9%84_%D8%A8%D8%AF%D9%88%D9%86_%D8%B9%D8%B6%D9%88%DB%8C%D8%AA_%D8%8C_%D9%BE%D8%B1%D8%B3_%D9%88_%D8%AC%D9%88_%D8%A7%D8%B6%D8%A7%D9%81%DB%8C_%D8%B1%D8%AE_%D9%85%DB%8C_%D8%AF%D9%87%D8%AF\" >\u062a\u0646\u0628\u0644 (\u0628\u062f\u0648\u0646 \u0639\u0636\u0648\u06cc\u062a \u060c \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0636\u0627\u0641\u06cc \u0631\u062e \u0645\u06cc \u062f\u0647\u062f)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#5_%D8%B1%D8%A7%D9%87%D9%86%D9%85%D8%A7%DB%8C_%D8%A7%D9%86%D8%AA%D8%AE%D8%A7%D8%A8_%D8%A8%D9%87%DB%8C%D9%86%D9%87\" >5. \u0631\u0627\u0647\u0646\u0645\u0627\u06cc \u0627\u0646\u062a\u062e\u0627\u0628 \u0628\u0647\u06cc\u0646\u0647<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/nabfollower.com\/blog\/%d8%b1%d8%a7%d8%a8%d8%b7%d9%87-jpa-manytoon-%d9%88-%d8%a8%d9%87-%d8%a7%d8%b3%d8%aa%d8%b1%d8%a7%d8%aa%da%98%db%8c-%d8%a8%d9%be%db%8c%d9%88%d9%86%d8%af%db%8c%d8%af\/#%D9%BE%D8%A7%DB%8C%D8%A7%D9%86\" >\u067e\u0627\u06cc\u0627\u0646<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"1\"><\/span>\n<p>  1<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0627\u0632 \u0637\u0631\u06cc\u0642 \u06a9\u062f \u0645\u062b\u0627\u0644 \u0632\u06cc\u0631 <code>@ManyToOne<\/code> \u0628\u06cc\u0627\u06cc\u06cc\u062f \u0646\u06af\u0627\u0647\u06cc \u0628\u0647 \u0646\u062d\u0648\u0647 \u0627\u06cc\u062c\u0627\u062f \u06cc\u06a9 \u0631\u0627\u0628\u0637\u0647 \u0628\u067e\u0631\u062f\u0627\u0632\u06cc\u0645.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"%D8%AA%DB%8C%D9%85%DB%8C\"><\/span>\n<p>  \u062a\u06cc\u0645\u06cc<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight java\"><code><span class=\"nd\">@Entity<\/span>\n<span class=\"nd\">@Getter<\/span> <span class=\"nd\">@Setter<\/span>\n<span class=\"nd\">@NoArgsConstructor<\/span>\n<span class=\"nd\">@AllArgsConstructor<\/span>\n<span class=\"nd\">@ToString<\/span><span class=\"o\">(<\/span><span class=\"n\">exclude<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"members\"<\/span><span class=\"o\">)<\/span> <span class=\"c1\">\/\/ \uc21c\ud658 \ucc38\uc870 \ubc29\uc9c0<\/span>\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Team<\/span> <span class=\"o\">{<\/span>\n    <span class=\"nd\">@Id<\/span> <span class=\"nd\">@GeneratedValue<\/span>\n    <span class=\"nd\">@Column<\/span><span class=\"o\">(<\/span><span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"TEAM_ID\"<\/span><span class=\"o\">)<\/span>\n    <span class=\"kd\">private<\/span> <span class=\"nc\">Long<\/span> <span class=\"n\">id<\/span><span class=\"o\">;<\/span>\n\n    <span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">;<\/span>\n\n    <span class=\"nd\">@OneToMany<\/span><span class=\"o\">(<\/span><span class=\"n\">mappedBy<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"team\"<\/span><span class=\"o\">)<\/span> <span class=\"c1\">\/\/ \uc591\ubc29\ud5a5 \uad00\uacc4<\/span>\n    <span class=\"kd\">private<\/span> <span class=\"nc\">List<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">Member<\/span><span class=\"o\">&gt;<\/span> <span class=\"n\">members<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">ArrayList<\/span><span class=\"o\">&lt;&gt;();<\/span>\n\n    <span class=\"c1\">\/\/ \uc591\ubc29\ud5a5 \uad00\uacc4 \ud3b8\uc758 \uba54\uc11c\ub4dc<\/span>\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">addMember<\/span><span class=\"o\">(<\/span><span class=\"nc\">Member<\/span> <span class=\"n\">member<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\n        <span class=\"n\">member<\/span><span class=\"o\">.<\/span><span class=\"na\">setTeam<\/span><span class=\"o\">(<\/span><span class=\"k\">this<\/span><span class=\"o\">);<\/span>\n        <span class=\"n\">members<\/span><span class=\"o\">.<\/span><span class=\"na\">add<\/span><span class=\"o\">(<\/span><span class=\"n\">member<\/span><span class=\"o\">);<\/span>\n    <span class=\"o\">}<\/span>\n<span class=\"o\">}<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"%D9%86%D9%87%D8%A7%D8%AF_%D8%B9%D8%B6%D9%88\"><\/span>\n<p>  \u0646\u0647\u0627\u062f \u0639\u0636\u0648<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight java\"><code><span class=\"nd\">@Entity<\/span>\n<span class=\"nd\">@Getter<\/span> <span class=\"nd\">@Setter<\/span>\n<span class=\"nd\">@NoArgsConstructor<\/span>\n<span class=\"nd\">@AllArgsConstructor<\/span>\n<span class=\"nd\">@ToString<\/span><span class=\"o\">(<\/span><span class=\"n\">exclude<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"team\"<\/span><span class=\"o\">)<\/span> <span class=\"c1\">\/\/ \uc21c\ud658 \ucc38\uc870 \ubc29\uc9c0<\/span>\n<span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">Member<\/span> <span class=\"o\">{<\/span>\n    <span class=\"nd\">@Id<\/span> <span class=\"nd\">@GeneratedValue<\/span>\n    <span class=\"nd\">@Column<\/span><span class=\"o\">(<\/span><span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"MEMBER_ID\"<\/span><span class=\"o\">)<\/span>\n    <span class=\"kd\">private<\/span> <span class=\"nc\">Long<\/span> <span class=\"n\">id<\/span><span class=\"o\">;<\/span>\n\n    <span class=\"kd\">private<\/span> <span class=\"nc\">String<\/span> <span class=\"n\">username<\/span><span class=\"o\">;<\/span>\n\n    <span class=\"nd\">@ManyToOne<\/span><span class=\"o\">(<\/span><span class=\"n\">fetch<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">FetchType<\/span><span class=\"o\">.<\/span><span class=\"na\">LAZY<\/span><span class=\"o\">)<\/span> <span class=\"c1\">\/\/ \uc9c0\uc5f0 \ub85c\ub529<\/span>\n    <span class=\"nd\">@JoinColumn<\/span><span class=\"o\">(<\/span><span class=\"n\">name<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"TEAM_ID\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">nullable<\/span> <span class=\"o\">=<\/span> <span class=\"kc\">false<\/span><span class=\"o\">)<\/span> <span class=\"c1\">\/\/ NULL \ud5c8\uc6a9 \uc5ec\ubd80 \uc124\uc815<\/span>\n    <span class=\"kd\">private<\/span> <span class=\"nc\">Team<\/span> <span class=\"n\">team<\/span><span class=\"o\">;<\/span>\n<span class=\"o\">}<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><code>Member<\/code>  \u0645\u0648\u062c\u0648\u062f\u06cc\u062a <code>Team<\/code> \u0645\u0648\u062c\u0648\u062f\u06cc\u062a <code>@ManyToOne<\/code> \u0631\u0627\u0628\u0637\u0647 \u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u06cc\u062f <code>@JoinColumn(name = \"TEAM_ID\")<\/code>\u0627\u0632 \u0637\u0631\u06cc\u0642 <code>Member<\/code> \u06cc\u06a9 \u0633\u062a\u0648\u0646 \u06a9\u0644\u06cc\u062f \u062e\u0627\u0631\u062c\u06cc \u062f\u0631 \u062c\u062f\u0648\u0644 \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"2_%D9%88%DB%8C%DA%98%DA%AF%DB%8C_%D9%88%D8%A7%DA%A9%D8%B4%DB%8C_%D8%A8%D9%84%D8%A7%D9%81%D8%A7%D8%B5%D9%84%D9%87_%D8%A8%D8%A7%D8%B1%DA%AF%DB%8C%D8%B1%DB%8C_%D8%AF%D8%B1_%D9%85%D9%82%D8%A7%D8%A8%D9%84_%D8%A8%D8%A7%D8%B1%DA%AF%DB%8C%D8%B1%DB%8C_%D8%AA%D8%A7%D8%AE%DB%8C%D8%B1\"><\/span>\n<p>  2. \u0648\u06cc\u0698\u06af\u06cc \u0648\u0627\u06a9\u0634\u06cc: \u0628\u0644\u0627\u0641\u0627\u0635\u0644\u0647 \u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u062f\u0631 \u0645\u0642\u0627\u0628\u0644. \u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u062a\u0627\u062e\u06cc\u0631<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><code>@ManyToOne<\/code>  \u062d\u0627\u0634\u06cc\u0647 \u0646\u0648\u06cc\u0633\u06cc <code>fetch<\/code> \u0627\u06cc\u0646 \u0645\u0644\u06a9 \u062a\u0635\u0645\u06cc\u0645 \u0645\u06cc \u06af\u06cc\u0631\u062f \u06a9\u0647 \u0686\u0647 \u0632\u0645\u0627\u0646\u06cc \u0645\u0648\u062c\u0648\u062f\u06cc\u062a \u0645\u0631\u062a\u0628\u0637 \u0631\u0627 \u0628\u0647 \u0647\u0645\u0631\u0627\u0647 \u062e\u0648\u0627\u0647\u062f \u062f\u0627\u0634\u062a.<\/p>\n<div class=\"table-wrapper-paragraph\">\n<table>\n<thead>\n<tr>\n<th>\u0648\u06cc\u0698\u06af\u06cc \u0648\u0627\u06a9\u0634\u06cc<\/th>\n<th>\u062a\u0648\u0636\u06cc\u062d<\/th>\n<th>\u0634\u0627\u06cc\u0633\u062a\u06af\u06cc<\/th>\n<th>\u0636\u0631\u0631<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u0645\u0634\u062a\u0627\u0642<\/td>\n<td>\n<code>Member<\/code>  \u062a\u062d\u0642\u06cc\u0642 <code>Team<\/code>\u0628\u0644\u0627\u0641\u0627\u0635\u0644\u0647 \u062c\u0633\u062a\u062c\u0648 \u06a9\u0646\u06cc\u062f<\/td>\n<td>\u0647\u0645\u0647 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0628\u0627 \u06cc\u06a9 \u067e\u0631\u0633 \u0648 \u062c\u0648<\/td>\n<td>\u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u063a\u06cc\u0631 \u0636\u0631\u0648\u0631\u06cc \u062f\u0631 \u062f\u0633\u062a\u0631\u0633 \u0627\u0633\u062a<\/td>\n<\/tr>\n<tr>\n<td>\u062a\u0646\u0628\u0644<\/td>\n<td>\n<code>Member<\/code>  \u062a\u062d\u0642\u06cc\u0642 <code>Team<\/code>\u067e\u0631\u0633 \u0648 \u062c\u0648 \u062f\u0631 \u0635\u0648\u0631\u062a \u0644\u0632\u0648\u0645<\/td>\n<td>\u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f<\/td>\n<td>\u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0636\u0627\u0641\u06cc \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0631\u062e \u062f\u0647\u062f (\u0645\u0634\u06a9\u0644 N+1)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p><em>\u0628\u0631\u0627\u06cc \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u0627\u0632 \u0645\u0634\u06a9\u0644 N+1 <code>JOIN FETCH<\/code> (JPQL) \u06cc\u0627 <code>@EntityGraph<\/code>\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0622\u0646 \u062e\u0648\u0628 \u0627\u0633\u062a.<\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"3_%D8%AE%D8%B5%D9%88%D8%B5%DB%8C%D8%A7%D8%AA_%D9%82%D8%A7%D8%A8%D9%84_%D8%AA%D9%87%DB%8C_NULL_%D8%A7%D8%AC%D8%A7%D8%B2%D9%87_%D9%88_%D8%A7%D8%B3%D8%AA%D8%B1%D8%A7%D8%AA%DA%98%DB%8C_%D9%BE%DB%8C%D9%88%D8%B3%D8%AA%D9%86\"><\/span>\n<p>  3. \u062e\u0635\u0648\u0635\u06cc\u0627\u062a \u0642\u0627\u0628\u0644 \u062a\u0647\u06cc: NULL \u0627\u062c\u0627\u0632\u0647 \u0648 \u0627\u0633\u062a\u0631\u0627\u062a\u0698\u06cc \u067e\u06cc\u0648\u0633\u062a\u0646<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><code>@JoinColumn<\/code>\u0627\u0632 <code>nullable<\/code> \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627 \u0645\u062c\u0627\u0632 \u0631\u0627 \u0628\u0631\u0627\u06cc \u0627\u062c\u0627\u0632\u0647 \u062f\u0627\u062f\u0646 \u0628\u0647 \u062a\u0647\u06cc \u0633\u062a\u0648\u0646 \u06a9\u0644\u06cc\u062f \u0633\u0631\u067e\u0627\u06cc\u06cc \u062a\u0646\u0638\u06cc\u0645 \u0645\u06cc \u06a9\u0646\u0646\u062f \u0648 \u0628\u0631 \u0646\u0648\u0639 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0648\u0635\u0644 \u0627\u06cc\u062c\u0627\u062f \u0634\u062f\u0647 \u062a\u0648\u0633\u0637 JPA \u062a\u0623\u062b\u06cc\u0631 \u0645\u06cc \u06af\u0630\u0627\u0631\u0646\u062f.<\/p>\n<div class=\"table-wrapper-paragraph\">\n<table>\n<thead>\n<tr>\n<th>\u062f\u0627\u0631\u0627\u06cc\u06cc \u0642\u0627\u0628\u0644 \u0628\u0631\u06af\u0634\u062a<\/th>\n<th>\u062a\u0648\u0636\u06cc\u062d<\/th>\n<th>\u067e\u06cc\u0648\u0633\u062a\u0646<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\n<code>true<\/code>  (\u067e\u06cc\u0634 \u0641\u0631\u0636)<\/td>\n<td>\u0633\u062a\u0648\u0646 \u06a9\u0644\u06cc\u062f \u0633\u0631\u067e\u0627\u06cc\u06cc \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc \u062f\u0647\u062f<\/td>\n<td>\u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u0628\u06cc\u0631\u0648\u0646\u06cc<\/td>\n<\/tr>\n<tr>\n<td><code>false<\/code><\/td>\n<td>\u0633\u062a\u0648\u0646 \u06a9\u0644\u06cc\u062f \u0633\u0631\u067e\u0627\u06cc\u06cc \u0627\u062c\u0627\u0632\u0647 \u062a\u0647\u06cc \u0646\u0645\u06cc \u06a9\u0646\u062f<\/td>\n<td>\u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u062f\u0627\u062e\u0644<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"%D8%AA%D8%BA%DB%8C%DB%8C%D8%B1_%D8%AF%D8%B1_%D8%B1%D9%88%D8%B4_%D9%BE%DB%8C%D9%88%D8%B3%D8%AA%D9%86_%D8%A8%D8%A7_%D8%AA%D9%88%D8%AC%D9%87_%D8%A8%D9%87_%D8%A7%DB%8C%D9%86%DA%A9%D9%87_%D8%A2%DB%8C%D8%A7_%D8%AA%D9%87%DB%8C_%D8%A7%D8%AC%D8%A7%D8%B2%D9%87_%D9%85%DB%8C_%D8%AF%D9%87%D8%AF\"><\/span>\n<p>  \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0631 \u0631\u0648\u0634 \u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0627 \u062a\u0648\u062c\u0647 \u0628\u0647 \u0627\u06cc\u0646\u06a9\u0647 \u0622\u06cc\u0627 \u062a\u0647\u06cc \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc \u062f\u0647\u062f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>\n<code>nullable = true<\/code>  \u2192 <code>LEFT OUTER JOIN<\/code> \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0634\u062f\u0647 (\u0645\u062a\u0635\u0644 <code>Team<\/code>\u062d\u062a\u06cc \u0627\u06af\u0631 \u0648\u062c\u0648\u062f \u0646\u062f\u0627\u0634\u062a\u0647 \u0628\u0627\u0634\u062f <code>Member<\/code> \u0627\u0633\u062a\u0639\u0644\u0627\u0645)<\/li>\n<li>\n<code>nullable = false<\/code>  \u2192 <code>INNER JOIN<\/code> \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0634\u062f\u0647 (\u0645\u062a\u0635\u0644 <code>Team<\/code>\u0646\u0627\u0628\u0631\u0627\u0628 <code>Member<\/code>\u067e\u0631\u0633\u06cc\u062f\u0647 \u0646\u0645\u06cc \u0634\u0648\u062f)<\/li>\n<\/ul>\n<p><em>\u0627\u062a\u0635\u0627\u0644 \u062f\u0627\u062e\u0644\u06cc \u0627\u063a\u0644\u0628 \u0633\u0648\u062f\u0645\u0646\u062f\u062a\u0631 \u0627\u0632 Left Left Lefter \u0627\u0633\u062a.<\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"4\"><\/span>\n<p>  4.<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"EAGER_NULLABLE_TRUE_%D9%BE%DB%8C%D9%88%D8%B3%D8%AA%D9%86_%D8%A8%D9%87_%D8%A8%DB%8C%D8%B1%D9%88%D9%86%DB%8C_%DA%86%D9%BE\"><\/span>\n<p>  EAGER + NULLABLE = TRUE (\u067e\u06cc\u0648\u0633\u062a\u0646 \u0628\u0647 \u0628\u06cc\u0631\u0648\u0646\u06cc \u0686\u067e)<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">MEMBER_ID<\/span><span class=\"p\">,<\/span> <span class=\"n\">t<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span><span class=\"p\">,<\/span> <span class=\"n\">t<\/span><span class=\"p\">.<\/span><span class=\"n\">name<\/span><span class=\"p\">,<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">username<\/span>\n<span class=\"k\">FROM<\/span> <span class=\"n\">Member<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">LEFT<\/span> <span class=\"k\">JOIN<\/span> <span class=\"n\">Team<\/span> <span class=\"n\">t<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">t<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span> <span class=\"o\">=<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">MEMBER_ID<\/span> <span class=\"o\">=<\/span> <span class=\"o\">?<\/span><span class=\"p\">;<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"Eage_nullable_false_inner_join\"><\/span>\n<p>  Eage + nullable = false (inner join)<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"k\">SELECT<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">MEMBER_ID<\/span><span class=\"p\">,<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span><span class=\"p\">,<\/span> <span class=\"n\">t<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span><span class=\"p\">,<\/span> <span class=\"n\">t<\/span><span class=\"p\">.<\/span><span class=\"n\">name<\/span><span class=\"p\">,<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">username<\/span>\n<span class=\"k\">FROM<\/span> <span class=\"n\">Member<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">JOIN<\/span> <span class=\"n\">Team<\/span> <span class=\"n\">t<\/span> <span class=\"k\">ON<\/span> <span class=\"n\">t<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span> <span class=\"o\">=<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">MEMBER_ID<\/span> <span class=\"o\">=<\/span> <span class=\"o\">?<\/span><span class=\"p\">;<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"%D8%AA%D9%86%D8%A8%D9%84_%D8%A8%D8%AF%D9%88%D9%86_%D8%B9%D8%B6%D9%88%DB%8C%D8%AA_%D8%8C_%D9%BE%D8%B1%D8%B3_%D9%88_%D8%AC%D9%88_%D8%A7%D8%B6%D8%A7%D9%81%DB%8C_%D8%B1%D8%AE_%D9%85%DB%8C_%D8%AF%D9%87%D8%AF\"><\/span>\n<p>  \u062a\u0646\u0628\u0644 (\u0628\u062f\u0648\u0646 \u0639\u0636\u0648\u06cc\u062a \u060c \u067e\u0631\u0633 \u0648 \u062c\u0648 \u0627\u0636\u0627\u0641\u06cc \u0631\u062e \u0645\u06cc \u062f\u0647\u062f)<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight sql\"><code><span class=\"c1\">-- Member \uc870\ud68c (Team \uc870\uc778 \uc5c6\uc74c)<\/span>\n<span class=\"k\">SELECT<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">MEMBER_ID<\/span><span class=\"p\">,<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span><span class=\"p\">,<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">username<\/span>\n<span class=\"k\">FROM<\/span> <span class=\"n\">Member<\/span> <span class=\"n\">m<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">m<\/span><span class=\"p\">.<\/span><span class=\"n\">MEMBER_ID<\/span> <span class=\"o\">=<\/span> <span class=\"o\">?<\/span><span class=\"p\">;<\/span>\n\n<span class=\"c1\">-- findMember.getTeam().getName() \ud638\ucd9c \uc2dc \ucd94\uac00 \ucffc\ub9ac \uc2e4\ud589<\/span>\n<span class=\"k\">SELECT<\/span> <span class=\"n\">t<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span><span class=\"p\">,<\/span> <span class=\"n\">t<\/span><span class=\"p\">.<\/span><span class=\"n\">name<\/span>\n<span class=\"k\">FROM<\/span> <span class=\"n\">Team<\/span> <span class=\"n\">t<\/span>\n<span class=\"k\">WHERE<\/span> <span class=\"n\">t<\/span><span class=\"p\">.<\/span><span class=\"n\">TEAM_ID<\/span> <span class=\"o\">=<\/span> <span class=\"o\">?<\/span><span class=\"p\">;<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><em><code>em.getReference(Team.class, id)<\/code>\u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u06cc\u06a9 \u0634\u06cc\u0621 \u067e\u0631\u0648\u06a9\u0633\u06cc \u0628\u0627\u0632 \u0645\u06cc \u06af\u0631\u062f\u062f.<\/em><\/p>\n<h2><span class=\"ez-toc-section\" id=\"5_%D8%B1%D8%A7%D9%87%D9%86%D9%85%D8%A7%DB%8C_%D8%A7%D9%86%D8%AA%D8%AE%D8%A7%D8%A8_%D8%A8%D9%87%DB%8C%D9%86%D9%87\"><\/span>\n<p>  5. \u0631\u0627\u0647\u0646\u0645\u0627\u06cc \u0627\u0646\u062a\u062e\u0627\u0628 \u0628\u0647\u06cc\u0646\u0647<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u2705 \u0628\u0631\u0627\u06cc \u062d\u0641\u0638 \u06cc\u06a9\u067e\u0627\u0631\u0686\u06af\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627:<\/p>\n<ul>\n<li>\n<code>nullable = false<\/code>  (\u0647\u0631 <code>Member<\/code>\u0644\u0632\u0648\u0645\u0627\u064b <code>Team<\/code>\u0628\u0627\u06cc\u062f \u0645\u062a\u0639\u0644\u0642 \u0628\u0627\u0634\u062f)<\/li>\n<li>\n<code>INNER JOIN<\/code>\u0639\u0645\u0644\u06a9\u0631\u062f \u0631\u0627 \u0645\u06cc \u062a\u0648\u0627\u0646 \u0627\u0632 \u0637\u0631\u06cc\u0642<\/li>\n<\/ul>\n<p>\u2705 \u0627\u06af\u0631 \u0645\u06cc \u062e\u0648\u0627\u0647\u06cc\u062f \u0628\u0647\u06cc\u0646\u0647 \u0633\u0627\u0632\u06cc \u0639\u0645\u0644\u06a9\u0631\u062f:<\/p>\n<ul>\n<li>\n<code>FetchType.LAZY<\/code>  \u0627\u0633\u062a\u0641\u0627\u062f\u0647 (\u0628\u0627\u0631\u06af\u06cc\u0631\u06cc \u062f\u0627\u062f\u0647 \u0647\u0627\u06cc \u063a\u06cc\u0631 \u0636\u0631\u0648\u0631\u06cc)<\/li>\n<li>\u062f\u0631 \u0635\u0648\u0631\u062a \u0644\u0632\u0648\u0645 <code>JOIN FETCH(JPQL)<\/code> \u06cc\u0627 <code>@EntityGraph<\/code> \u062a\u0631\u06a9\u06cc\u0628<\/li>\n<\/ul>\n<p>\u2705 \u0627\u06af\u0631 \u0628\u0647 \u06cc\u06a9 \u0645\u062f\u0644 \u062f\u0627\u062f\u0647 \u0627\u0646\u0639\u0637\u0627\u0641 \u067e\u0630\u06cc\u0631 \u0646\u06cc\u0627\u0632 \u062f\u0627\u0631\u06cc\u062f:<\/p>\n<ul>\n<li>\n<code>nullable = true<\/code>  (\u063a\u06cc\u0631 \u0645\u0646\u062a\u0638\u0631\u0647 <code>Member<\/code>\u0645\u062c\u0627\u0632)<\/li>\n<li>\n<code>LEFT OUTER JOIN<\/code>\u0628\u0627 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 \u0627\u0632 \u062f\u0633\u062a \u062f\u0627\u062f\u0646 \u062f\u0627\u062f\u0647 \u0647\u0627 \u062c\u0644\u0648\u06af\u06cc\u0631\u06cc \u06a9\u0646\u06cc\u062f<\/li>\n<\/ul>\n<p>\u2705 \u062f\u0631 \u0635\u0648\u0631\u062a \u0646\u06cc\u0627\u0632 \u0628\u0647 \u0634\u0646\u0627\u0633\u0647:<\/p>\n<ul>\n<li>\n<code>em.getReference()<\/code>  \u0627\u0633\u062a\u0641\u0627\u062f\u0647 (\u067e\u06cc\u0634\u06af\u06cc\u0631\u06cc \u0627\u0632 \u062a\u062d\u0642\u06cc\u0642 \u063a\u06cc\u0631 \u0636\u0631\u0648\u0631\u06cc)<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"%D9%BE%D8%A7%DB%8C%D8%A7%D9%86\"><\/span>\n<p>  \u067e\u0627\u06cc\u0627\u0646<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0635\u062d\u06cc\u062d \u0627\u0632 \u0627\u0633\u062a\u0631\u0627\u062a\u0698\u06cc \u067e\u06cc\u0648\u0633\u062a\u0646 JPA \u0648 \u0645\u062d\u062f\u0648\u062f\u06cc\u062a \u0647\u0627\u06cc \u062a\u0647\u06cc \u0645\u06cc \u062a\u0648\u0627\u0646\u062f \u0639\u0645\u0644\u06a9\u0631\u062f \u0648 \u06cc\u06a9\u067e\u0627\u0631\u0686\u06af\u06cc \u062f\u0627\u062f\u0647 \u0628\u0631\u0646\u0627\u0645\u0647 \u0631\u0627 \u0647\u0645\u0632\u0645\u0627\u0646 \u062a\u0636\u0645\u06cc\u0646 \u06a9\u0646\u062f.<\/p>\n<p>\u0645\u0647\u0645 \u0627\u0633\u062a \u06a9\u0647 \u0628\u0627 \u062f\u0631 \u0646\u0638\u0631 \u06af\u0631\u0641\u062a\u0646 \u0645\u062f\u0644 \u062f\u0627\u062f\u0647 \u0648 \u0627\u0644\u0632\u0627\u0645\u0627\u062a \u0639\u0645\u0644\u06a9\u0631\u062f \u0645\u0648\u0631\u062f \u0646\u06cc\u0627\u0632 \u067e\u0631\u0648\u0698\u0647 \u060c \u062a\u0646\u0638\u06cc\u0645 \u0628\u0647\u06cc\u0646\u0647 \u0631\u0627 \u0627\u0646\u062a\u062e\u0627\u0628 \u06a9\u0646\u06cc\u062f.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>JPA (API \u067e\u0627\u06cc\u062f\u0627\u0631\u06cc \u062c\u0627\u0648\u0627) \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u0648\u0638\u0627\u06cc\u0641 \u067e\u0627\u06cc\u06af\u0627\u0647 \u062f\u0627\u062f\u0647 \u0631\u0627 \u0628\u0637\u0648\u0631 \u0639\u06cc\u0646\u06cc \u067e\u0631\u062f\u0627\u0632\u0634 \u06a9\u0646\u06cc\u062f. \u0628\u0627 \u0627\u06cc\u0646 \u062d\u0627\u0644 \u060c \u0628\u0633\u062a\u0647 \u0628\u0647 \u0631\u0627\u0628\u0637\u0647 \u0628\u06cc\u0646 \u0646\u0647\u0627\u062f \u0648 \u0631\u0648\u0634 \u067e\u0631\u0633 \u0648 \u062c\u0648 \u060c \u0645\u0645\u06a9\u0646 \u0627\u0633\u062a \u0639\u0645\u0644\u06a9\u0631\u062f \u0648 \u06cc\u06a9\u067e\u0627\u0631\u0686\u06af\u06cc \u062f\u0627\u062f\u0647 \u0628\u0631\u0646\u0627\u0645\u0647 \u0628\u0633\u06cc\u0627\u0631 \u0645\u062a\u0641\u0627\u0648\u062a \u0628\u0627\u0634\u062f. \u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 @ManyToOne \u0627\u0633\u062a\u0631\u0627\u062a\u0698\u06cc \u067e\u06cc\u0648\u0633\u062a\u0646 JPA \u0648 @JoinColumn\u0627\u0632 nullable \u0628\u0647 \u062c\u0644\u0648\u0647 \u0647\u0627\u06cc &hellip;<\/p>\n","protected":false},"author":2,"featured_media":101021,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"https:\/\/media2.dev.to\/dynamic\/image\/width=1000,height=500,fit=cover,gravity=auto,format=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fmzhat0kygweunzpwb47l.png","fifu_image_alt":"","footnotes":""},"categories":[339],"tags":[],"class_list":["post-101020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dev"],"_links":{"self":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/101020","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/comments?post=101020"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/101020\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/101021"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=101020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=101020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=101020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}