![\"JPA](\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65649583daa94e2bdf7bf7b2\/2-0.png\" "\\"\\"")
<\/div>\n<dependency>\r\n <groupId>org.hibernate.javax.persistence<\/groupId>\r\n <artifactId>hibernate-jpa-2.1-api<\/artifactId>\r\n <version>1.0.0.Final<\/version>\r\n<\/dependency>\r\n<\/code><\/pre>\nJava\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30c6\u30fc\u30d6\u30eb\u306b\u30de\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u305f\u3081\u306eJPA\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3<\/h3>\n
\u91cd\u8981\u306aJPA\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306e\u4e00\u90e8\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3053\u308c\u3089\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u3001javax.persistence\u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u5b58\u5728\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\n- \n
javax.persistence.Entity: \u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30af\u30e9\u30b9\u304c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3067\u3042\u308b\u3053\u3068\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30af\u30e9\u30b9\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3001\u5217\u6319\u578b\u306b\u9069\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\nimport javax.persistence.Entity;<\/p>\n
@Entity
\npublic class Employee implements Serializable {
\n}<\/p>\n
@Table: \u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u3053\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u304c\u30de\u30c3\u30d4\u30f3\u30b0\u3055\u308c\u308b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001\u30c7\u30fc\u30bf\u306f\u300cemployee\u300d\u30c6\u30fc\u30d6\u30eb\u306b\u683c\u7d0d\u3055\u308c\u307e\u3059\u3002@Table\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306ename\u5c5e\u6027\u3092\u4f7f\u7528\u3057\u3066\u30c6\u30fc\u30d6\u30eb\u540d\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
import javax.persistence.Entity;
\nimport javax.persistence.Table;<\/p>\n
@Entity
\n@Table(name = “employee”)
\npublic class Employee implements Serializable {
\n}<\/p>\n
@Column: @Column\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u3001\u5217\u306e\u30de\u30c3\u30d4\u30f3\u30b0\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002\u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306ename\u5c5e\u6027\u306f\u3001\u30c6\u30fc\u30d6\u30eb\u306e\u5217\u540d\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
import javax.persistence.Column;
\nimport javax.persistence.Entity;
\nimport javax.persistence.Table;<\/p>\n
@Entity
\n@Table(name = “employee”)
\npublic class Employee implements Serializable {<\/p>\n
@Column(name = “employee_name”)
\nprivate String employeeName;
\n}<\/p>\n
@Id: \u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u4e3b\u30ad\u30fc\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
import javax.persistence.*;<\/p>\n
@Entity
\n@Table(name = “employee”)
\npublic class Employee implements Serializable {
\n@Id
\n@Column(name = “id”)
\nprivate int id;
\n}<\/p>\n
@GeneratedValue: \u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306f\u3001\u4e3b\u30ad\u30fc\u306e\u5024\u306e\u751f\u6210\u6226\u7565\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
import javax.persistence.*;<\/p>\n
@Entity
\n@Table(name = “employee”)
\npublic class Employee implements Serializable {<\/p>\n
@Id
\n@Column(name = “id”)
\n@GeneratedValue(strategy=SEQUENCE, generator=”ID_SEQ”)
\nprivate int id;
\n}<\/p>\n
@Version: \u3053\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30d0\u30fc\u30b8\u30e7\u30cb\u30f3\u30b0\u3084\u540c\u6642\u5b9f\u884c\u5236\u5fa1\u3092\u5236\u5fa1\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
import javax.persistence.*;<\/p>\n
@Entity
\n@Table(name = “employee”)
\npublic class Employee implements Serializable {
\n@Version
\n@Column(name = “version”)
\nprivate Date version;
\n}<\/p>\n
@OrderBy: @OrderBy\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u30c7\u30fc\u30bf\u3092\u30bd\u30fc\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u4f8b\u3067\u306f\u3001\u3059\u3079\u3066\u306eemployees_address\u3092id\u3067\u6607\u9806\u306b\u4e26\u3079\u66ff\u3048\u307e\u3059\u3002<\/p>\n
@OrderBy(“id asc”)
\nprivate Set employee_address;<\/p>\n
@Transient: \u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u3059\u3079\u3066\u306e\u975estatic\u3067\u975etransient\u306a\u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u6c38\u7d9a\u7684\u3068\u898b\u306a\u3055\u308c\u307e\u3059\u304c\u3001@Transient\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u6307\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u9650\u308a\u3067\u3059\u3002<\/p>\n
@Transient
\nPrivate int employeePhone;<\/p>\n
@Lob: \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f@Lob\u3092\u4f7f\u7528\u3057\u3066\u5ba3\u8a00\u3055\u308c\u307e\u3059\u3002<\/p>\n
@Lob
\npublic String getEmployeeAddress() {
\nreturn employeeAddress;
\n}<\/p>\n
\u4e0a\u8a18\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u30bb\u30c3\u30c8\u306f\u3001\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306b\u6700\u3082\u4e00\u822c\u7684\u306b\u4f7f\u7528\u3055\u308c\u308bJPA\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u3002<\/p>\n
\u30c6\u30fc\u30d6\u30eb\u9593\u306e\u30de\u30c3\u30d4\u30f3\u30b0\u306e\u305f\u3081\u306eHibernate\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3<\/h3>\n
\u79c1\u305f\u3061\u306f\u3001\u7570\u306a\u308b\u30c6\u30fc\u30d6\u30eb\u3068\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u95a2\u9023\u4ed8\u3051\u30de\u30c3\u30d4\u30f3\u30b0\u3092\u6307\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u5225\u306e\u6ce8\u91c8\u30bb\u30c3\u30c8\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b7\u30ca\u30ea\u30aa\u3092\u8003\u3048\u3066\u3001\u4f8b\u3092\u6319\u3052\u307e\u3059\u3002<\/p>\n
\n- Tables \u2018employee\u2019 and \u2018employeeDetail\u2019 have one-to-one association and they share the same primary key.<\/li>\n
- Tables \u2018communication\u2019 and \u2018communicationDetail\u2019 are linked by a foreign key. It is also a one to one association.<\/li>\n
- Tables \u2018communication\u2019 and \u2018employee\u2019 are linked using a foreign key in many-to-one association with communication being the owner.<\/li>\n
- Tables \u2018employee\u2019 and \u2018employeeStatus\u2019 are linked through a foreign key in many-to-one association with employee being the owner.<\/li>\n<\/ul>\n
@OneToOne\u306eEmployee\u3068EmployeeDetail\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306f\u3001\u540c\u3058\u4e3b\u30ad\u30fc\u3092\u5171\u6709\u3057\u3066\u304a\u308a\u3001@OneToOne\u3068@PrimaryKeyJoinColumn\u3092\u4f7f\u7528\u3057\u3066\u95a2\u9023\u4ed8\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001EmployeeDetail\u306eid\u30d7\u30ed\u30d1\u30c6\u30a3\u306f@GeneratedValue\u3067\u6ce8\u91c8\u4ed8\u3051\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002Employee\u306eid\u5024\u304cEmployeeDetail\u306eid\u3068\u3057\u3066\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
@Entity\r\n@Table(name = \"employee\")\r\npublic class Employee implements Serializable {\r\n \r\n @Id\r\n @Column(name = \"id\")\r\n @GeneratedValue\r\n private int id;\r\n \r\n @OneToOne(cascade = CascadeType.MERGE)\r\n @PrimaryKeyJoinColumn\r\n private EmployeeDetail employeeDetail;\r\n}\r\n \r\n@Entity\r\n@Table(name = \"employeeDetail\")\r\npublic class EmployeeDetail implements Serializable {\r\n \r\n @Id\r\n @Column(name = \"id\")\r\n private int id;\r\n}\r\n<\/code><\/pre>\n\u6ce8\u610f\u3059\u3079\u304d\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n
\n- @PrimaryKeyJoinColumn should be used for associated entities sharing the same primary key.<\/li>\n
- @JoinColumn & @OneToOne should be mappedBy attribute when foreign key is held by one of the entities.<\/li>\n<\/ul>\n
\u901a\u4fe1\u3068\u901a\u4fe1\u306e\u8a73\u7d30\u306f\u3001\u5916\u90e8\u30ad\u30fc\u3092\u4ecb\u3057\u3066\u30ea\u30f3\u30af\u3055\u308c\u3066\u3044\u308b\u305f\u3081\u3001@OneToOne\u3068@JoinColumn\u306e\u6ce8\u91c8\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306e\u30b9\u30cb\u30da\u30c3\u30c8\u3067\u3001\u901a\u4fe1\u306e\u305f\u3081\u306b\u751f\u6210\u3055\u308c\u305fID\u306f\u3001\u901a\u4fe1\u306e\u8a73\u7d30\u306e\u30c6\u30fc\u30d6\u30eb\u306e\u300ccommunication_id\u300d\u5217\u306b\u30de\u30c3\u30d7\u3055\u308c\u307e\u3059\u3002\u540c\u3058\u3053\u3068\u3092\u884c\u3046\u305f\u3081\u306b@MapsId\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
@Entity\r\n@Table(name = \"communicationDetail\")\r\npublic class CommunicationDetail implements Serializable {\r\n \r\n @Id\r\n @Column(name = \"id\")\r\n @GeneratedValue\r\n private int id;\r\n \r\n @OneToOne\r\n @MapsId\r\n @JoinColumn(name = \"communicationId\")\r\n private Communication communication;\r\n}\r\n \r\n@Entity\r\n@Table(name = \"communication\")\r\npublic class Communication implements Serializable {\r\n \r\n @Id\r\n @Column(name = \"ID\")\r\n @GeneratedValue\r\n private Integer id;\r\n \r\n @OneToOne(mappedBy = \"communication\", cascade = CascadeType.ALL)\r\n private CommunicationDetail communicationDetail;\r\n}\r\n<\/code><\/pre>\n\u591a\u304f\u306e\u5f93\u696d\u54e1\u304c\u540c\u3058\u30b9\u30c6\u30fc\u30bf\u30b9\u3092\u5171\u6709\u3067\u304d\u308b\u305f\u3081\u3001\u5f93\u696d\u54e1\u3068\u5f93\u696d\u54e1\u30b9\u30c6\u30fc\u30bf\u30b9\u306e\u95a2\u4fc2\u306f\u591a\u5bfe\u4e00\u3067\u3059\u3002\u540c\u3058\u3053\u3068\u306b\u306f @ManyToOne \u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n
@Entity\r\n@Table(name = \"employee\")\r\npublic class Employee implements Serializable {\r\n \r\n @ManyToOne\r\n @JoinColumn(name = \"statusId\")\r\n private EmployeeStatus status;\r\n}\r\n<\/code><\/pre>\n@OneToMany\u306e\u5f93\u696d\u54e1\u304b\u3089\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u3078\u306f\u30011\u5bfe\u591a\u306e\u95a2\u4fc2\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u95a2\u4fc2\u306e\u30aa\u30fc\u30ca\u30fc\u306f\u30b3\u30df\u30e5\u30cb\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u3042\u308a\u3001\u5f93\u696d\u54e1\u306b\u306f\u53cc\u65b9\u5411\u306e\u95a2\u4fc2\u3092\u4f5c\u308b\u305f\u3081\u306b\u300cmappedBy\u300d\u5c5e\u6027\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n
@Entity\r\n@Table(name = \"employee\")\r\npublic class Employee implements Serializable {\r\n \r\n @OneToMany(mappedBy = \"employee\", fetch = FetchType.EAGER)\r\n @OrderBy(\"firstName asc\")\r\n private Set communications;\r\n}\r\n<\/code><\/pre>\n@PrimaryKeyJoinColumn\u306f\u3001\u540c\u3058\u30d7\u30e9\u30a4\u30de\u30ea\u30ad\u30fc\u3092\u5171\u6709\u3059\u308b\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u95a2\u9023\u4ed8\u3051\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3067\u3059\u3002<\/p>\n
@Entity\r\n@Table(name = \"employee\")\r\npublic class Employee implements Serializable {\r\n \r\n @Id\r\n @Column(name = \"id\")\r\n @GeneratedValue\r\n private int id;\r\n \r\n @OneToOne(cascade = CascadeType.MERGE)\r\n @PrimaryKeyJoinColumn\r\n private EmployeeDetail employeeDetail;\r\n}\r\n<\/code><\/pre>\n@Entity\u306e\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u306b\u306f\u3001@JoinColumn\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u304c\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u30011\u5bfe1\u307e\u305f\u306f\u591a\u5bfe1\u306e\u95a2\u9023\u304c\u3042\u308a\u3001\u5916\u90e8\u30ad\u30fc\u304c\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306e\u3046\u3061\u306e1\u3064\u306b\u3088\u3063\u3066\u4fdd\u6301\u3055\u308c\u308b\u5834\u5408\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n
@ManyToOne\r\n@JoinColumn(name = \"statusId\")\r\nprivate EmployeeStatus status;\r\n<\/code><\/pre>\n@JoinTable: @JoinTable\u3068mappedBy\u306f\u3001\u9023\u60f3\u30c6\u30fc\u30d6\u30eb\u3092\u4ecb\u3057\u3066\u95a2\u9023\u4ed8\u3051\u3089\u308c\u305f\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u306b\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002
\n@MapsId: \u5171\u6709\u30ad\u30fc\u3092\u6301\u30642\u3064\u306e\u30a8\u30f3\u30c6\u30a3\u30c6\u30a3\u3092\u3001@MapsId\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u6c38\u7d9a\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
@OneToOne\r\n@MapsId\r\n@JoinColumn(name = \"communicationId\")\r\nprivate Communication communication;\r\n<\/code><\/pre>\n\u7d99\u627f\u30de\u30c3\u30d4\u30f3\u30b0\u306e\u305f\u3081\u306eHibernate\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3<\/h3>\n
\u4eca\u5ea6\u306f\u3001Hibernate\u306b\u304a\u3051\u308b\u7d99\u627f\u30de\u30c3\u30d4\u30f3\u30b0\u30a2\u30ce\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002Hibernate\u306f\u3001\u57fa\u672c\u7684\u306a\u7d99\u627f\u30de\u30c3\u30d4\u30f3\u30b0\u6226\u7565\u30923\u3064\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\n- table per class hierarchy<\/li>\n
- table per subclass<\/li>\n
- table per concrete class<\/li>\n<\/ul>\n
\u5404\u30bf\u30a4\u30d7\u306b\u3064\u3044\u3066\u3001\u4f8b\u3092\u8003\u3048\u307e\u3059\u3002<\/p>\n
\n- \n
\u30af\u30e9\u30b9\u968e\u5c64\u3054\u3068\u306e\u30c6\u30fc\u30d6\u30eb – \u30af\u30e9\u30b9\u968e\u5c64\u3054\u3068\u306e\u30b7\u30f3\u30b0\u30eb\u30c6\u30fc\u30d6\u30eb\u6226\u7565\u3002<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\n- \n
@Entity<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\n- \n
@Inheritance(strategy=InheritanceType.SINGLE_TABLE)<\/ol>\n<\/li>\n<\/ol>\n <\/p>\n
\n- \n
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@Entity
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@Entity
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\u5177\u8c61\u30af\u30e9\u30b9\u3054\u3068\u306e\u30c6\u30fc\u30d6\u30eb\u3002
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