JPA 覆盖多对多映射示例.pdfVIP

JPA 覆盖多对多映射⽰例 JPA教程 - JPA覆盖多对多映射⽰例 以下代码使⽤注释来覆盖多对多映射的默认列。 @ManyToMany @JoinTable(name=DEPT_EMP, joinColumns=@JoinColumn(name=DEPT_ID), inverseJoinColumns=@JoinColumn(name=EMP_ID)) @A ribu eOverrides({ @A ribu eOverride( name=firs _Name, column=@Column(name=EMP_FNAME)), @A ribu eOverride( name=las _Name, column=@Column(name=EMP_LNAME)) }) priva e MapEmployeeName, Employee employeesByName; 例⼦ 以下代码来⾃Employee .j ava 。 package mon; impor java.u il.Collec ion; impor java.u il.ArrayLis ; impor javax .persis ence.Collec ionTable; impor javax .persis ence.Column; impor javax .persis ence.Elemen Collec ion; impor javax .persis ence.Embedded; impor javax .persis ence.En i y; impor javax .persis ence.Genera edValue; impor javax .persis ence.Genera ionType; impor javax .persis ence.Id; impor javax .persis ence.ManyToMany; @En i y public class Employee { @Id @Genera edValue(s ra egy=Genera ionType.IDENTITY) priva e in id; @Embedded priva e EmployeeName name; priva e long salary; @ManyToMany(mappedBy=employeesByName) priva e Collec ionDepar men depar men s; public Employee() { name = new EmployeeName(); depar men s = new ArrayLis Depar men (); } public in ge Id() { re urn id; } public void se Id(in id) { his.id = id; } public EmployeeName ge Name() { re urn name; } public void se Name(EmployeeName name) { = name; } public S ring ge Firs Name() { re urn name.ge Firs _Name(); } public void se Firs Name(S ring firs Name) { .se Firs _Name(firs Name); } public S ring ge Las Name() { re urn name.ge Las _Name(); } public void se Las Name(S ring las Name) { .se Las _Name(las Name); } pu