[英]Hibernate: mapping a value from another table column
我有一個域實體看起來像這樣:
class Exch{
private int id;
private String val1;
private String val2;
@Column(name = "val1")
public String getVal1(){
return val1;
}
@Column(name = "val2")
public String getVal2(){
return val2;
}
@Column(name = "id")
public int id(){
return id;
}
}
和表:
EXCH
Exch_ID | VAL1 | VAL2
100000 | AAA | BBB
200000 | CCC | DDD
現在我有另一張表,看起來像:
exch_extra
Exch_ID | VAL3 | VAL4
100000 | ZZZ | YYY
200000 | XXX | UUU
無論如何我可以將exch_extra表中的val3映射到Entity Exch而無需創建額外的Exch_extra實體嗎?
所以我可以:
class Exch{
private int id;
private String val1;
private String val2;
private String val3;
@Column(name = "val1")
public String getVal1(){
return val1;
}
@Column(name = "val2")
public String getVal2(){
return val2;
}
@ do something here so i can have val3 from exch_extra table
public String val3(){
return val3
}
@Column(name = "id")
public int id(){
return id;
}
}
Hibernate有一個@SecondaryTable
注釋,可以幫助您將多個表映射到實體。
只需添加輔助表注釋,連接列(在輔助表中)注釋。
然后映射其他列,如:
@Column(name="val3", table="table2")
private int val3;
其中table2
是另一個表的名稱。
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