\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30e6\u30fc\u30b6\u30fcBean\u5185\u3067\u6240\u5c5e\u30af\u30e9\u30b9Bean\u3092\u6301\u305f\u305b\u308b\u3088\u3046\u306a\u95a2\u9023\u3092\u4f5c\u3063\u3066\u3044\u308b\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n
\r\npublic class UserBean {\r\n (\u7565)\r\n @OneToMany(orphanRemoval = true, cascade = CascadeType.ALL)\r\n private Set<UserClassBean> userClassBeans;\r\n (\u7565)\r\n}\r\n<\/pre>\n\u4e0a\u8a18\u3001\u6240\u5c5e\u30af\u30e9\u30b9Bean\u306eSet\u306b\u5bfe\u3059\u308b\u30d5\u30a7\u30c3\u30c1\u304c\u30c7\u30d5\u30a9\u30eb\u30c8\u3067FetchType.LAZY\u306b\u306a\u308b\u306e\u3067\u3001\u9045\u5ef6\u30d5\u30a7\u30c3\u30c1\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u6240\u5c5e\u30af\u30e9\u30b9\u304c\u3042\u308b\u306f\u305a\u306a\u306e\u306b\u53d6\u5f97\u304c\u3067\u304d\u305a\u3001\u307e\u305f\u30c7\u30fc\u30bf\u30ec\u30a4\u30e4\u3067session\u304c\u7d42\u4e86\u3057\u3066\u3044\u308b\u305f\u3081\u306b\u6539\u3081\u3066DB\u304b\u3089\u53d6\u5f97\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u306a\u3044\u72b6\u614b\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u5358\u7d14\u306bFetchType.EAGER\u3092\u6307\u5b9a\u3057\u3066\u304a\u3051\u3070\u9045\u5ef6\u30d5\u30a7\u30c3\u30c1\u306f\u767a\u751f\u3057\u306a\u304f\u306a\u308a\u307e\u3059\u304c\u3001\u8ca0\u8377\u304c\u5927\u304d\u3044\u305f\u3081\u63a8\u5968\u3055\u308c\u3066\u3044\u306a\u3044\u69d8\u5b50\u3067\u3059\u3002
\n\u30d3\u30e5\u30fc\u30ec\u30a4\u30e4\u3067Session\u3092\u958b\u304f\u65b9\u6cd5\u306a\u3069\u3082\u3042\u308b\u3088\u3046\u3067\u3059\u304c\u3001\u3053\u3061\u3089\u3082\u63a8\u5968\u3055\u308c\u3066\u3044\u306a\u3044\u69d8\u5b50\u3002<\/p>\n
\u3069\u3046\u3084\u3089JPQL\u3067JOIN\u3000FETCH\u3092\u884c\u3046\u30e1\u30bd\u30c3\u30c9\u3092\u5b9a\u7fa9\u3059\u308b\u306e\u304c\u3088\u3044\u3068\u306e\u3053\u3068\u3002<\/p>\n
\u3068\u3044\u3046\u308f\u3051\u3067UserBean\u3092\u53d6\u5f97\u3059\u308b\u969b\u306b\u3001Set\uff1cUserClassBean\uff1e\u3092JOIN FETCH\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092UserBean\u7528\u306eRepository\u306b\u5b9f\u88c5\u3057\u307e\u3057\u305f\u3002
\nfindById\u306eJOIN FETCH\u7248\u3067\u3059\u3002<\/p>\n
\r\npublic class UserRepository extends JpaRepository... {\r\n (\u7565)\r\n @Query("SELECT DISTINCT u FROM UserBean u LEFT JOIN FETCH u.userClassBeans WHERE u.id = :id")\r\n Optional<UserBean> findByIdFetchUserClass(@Param("id") String id);\r\n (\u7565)\r\n}\r\n<\/pre>\n\u3061\u306a\u307f\u306bJOIN FETCH\u3067\u306a\u304f\u3001LEFT JOIN FETCH\u3068\u3057\u3066\u304a\u304b\u306a\u3044\u3068\u3001SET\uff1cUserClassBean\uff1e\u3092\u6301\u305f\u306a\u3044\uff08\u30af\u30e9\u30b9\u306b\u6240\u5c5e\u3057\u306a\u3044\uff09\u30e6\u30fc\u30b6\u30fc\u304c\u53d6\u5f97\u3067\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u3002<\/p>\n