我有2代表父和子,父如1主键和复合唯一密钥(2根[UN_KEY1,UN_KEY2]的组合)。现在,在子表中我是指这2列作为外键。当我尝试生成Eclipse中的实体它显示多对一的关系,并显示父列。但是,当我生成这两列没有父实体产生。如何做交易一样添加,更新,删除这些实体没有这些列
表
--drop table "TBL_PARENT";
CREATE TABLE "TBL_PARENT"(
"S_ID" INTEGER NOT NULL GENERATED ALWAYS AS IDENTITY(START WITH 1, INCREMENT BY 1, NO MINVALUE, NO MAXVALUE, CACHE 20),
"UN_KEY1" Integer NOT NULL,
"UN_KEY2" Smallint NOT NULL,
"SOME_COL1" Integer
);
-- Add keys for table TBL_PARENT
ALTER TABLE "TBL_PARENT" ADD CONSTRAINT "TBL_PARENTKEY3" PRIMARY KEY ("S_ID");
ALTER TABLE "TBL_PARENT" ADD CONSTRAINT "TBL_PARENTKey4" UNIQUE ("UN_KEY1","UN_KEY2");
--drop table "TBL_PARENT";
CREATE TABLE "TBL_CHILD"(
"S_ID" Integer NOT NULL GENERATED ALWAYS AS IDENTITY(START WITH 1, INCREMENT BY 1, NO MINVALUE, NO MAXVALUE, CACHE 20),
"UN_KEY1" Integer,
"UN_KEY2" Integer,
"SOME_COL2" Integer
);
ALTER TABLE "TBL_CHILD" ADD CONSTRAINT "TBL_CHILD_KEY3" PRIMARY KEY ("S_ID");
ALTER TABLE "TBL_CHILD" ADD CONSTRAINT "TBL_CHILD_FK" FOREIGN KEY ("UN_KEY1", "UN_KEY2") REFERENCES "TBL_PARENT" ("UN_KEY1", "UN_KEY2");
生成的代码:
@Entity
@Table(name="TBL_PARENT")
@NamedQuery(name="TblParent.findAll", query="SELECT t FROM TblParent t")
public class TblParent implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name="S_ID")
private int sId;
@Column(name="SOME_COL1")
private int someCol1;
//bi-directional many-to-one association to TblChild
@OneToMany(mappedBy="tblParent")
private Set<TblChild> tblChilds;
public TblParent() {
}
public int getSId() {
return this.sId;
}
public void setSId(int sId) {
this.sId = sId;
}
public int getSomeCol1() {
return this.someCol1;
}
public void setSomeCol1(int someCol1) {
this.someCol1 = someCol1;
}
public Set<TblChild> getTblChilds() {
return this.tblChilds;
}
public void setTblChilds(Set<TblChild> tblChilds) {
this.tblChilds = tblChilds;
}
public TblChild addTblChild(TblChild tblChild) {
getTblChilds().add(tblChild);
tblChild.setTblParent(this);
return tblChild;
}
public TblChild removeTblChild(TblChild tblChild) {
getTblChilds().remove(tblChild);
tblChild.setTblParent(null);
return tblChild;
}
}
@Entity
@Table(name="TBL_CHILD")
@NamedQuery(name="TblChild.findAll", query="SELECT t FROM TblChild t")
public class TblChild implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name="S_ID")
private int sId;
@Column(name="SOME_COL2")
private int someCol2;
//bi-directional many-to-one association to TblParent
@ManyToOne
@JoinColumns({
@JoinColumn(name="UN_KEY1", referencedColumnName="UN_KEY1"),
@JoinColumn(name="UN_KEY2", referencedColumnName="UN_KEY2")
})
private TblParent tblParent;
public TblChild() {
}
public int getSId() {
return this.sId;
}
public void setSId(int sId) {
this.sId = sId;
}
public int getSomeCol2() {
return this.someCol2;
}
public void setSomeCol2(int someCol2) {
this.someCol2 = someCol2;
}
public TblParent getTblParent() {
return this.tblParent;
}
public void setTblParent(TblParent tblParent) {
this.tblParent = tblParent;
}
}
以下内容添加到TblParent对象
@Column(name = "UN_KEY1")
private int uniqueKey1;
@Column(name = "UN_KEY2")
private int uniqueKey2;
当创建一个新的对象,你会做以下
TblParent p = new TblParent();
p.setSId(1);
p.setSomeCol1(12);
p.setUniqueKey1(12);
p.setUniqueKey2(14);
p.setTblChilds(new HashSet<TblChild>());
TblChild c = new TblChild();
c.setSId(1);
c.setSomeCol2(14);
c.setTblParent(p);
p.getTblChilds.add(c);
当你创建这个父对象的框架会自动外键值添加到TblChild表。