复合键联接列 [英] composite key join columns
问题描述
我的表VENDORBRANCH具有复合键:"vendorCode"和"vendorBranchCode"是我使用@Id注释和@IdClass定义的.在VENDORCRTERMS类中,字段"vendorCode"被引用为外键.我正在使用postgresql db. 现在,我在服务实现中的sql查询看起来像这样,但是我想在查询中包括复合键:
My table VENDORBRANCH has composite keys: "vendorCode" and "vendorBranchCode" which I have defined using the @Id annotation and using @IdClass. The field "vendorCode" is referenced as a foreign key in VENDORCRTERMS class. I'm using postgresql db. Right now my sql query in the service implimentation looks like this but i want to include composite keys in the query:
Query<?> query = session.createQuery("from VENDORBRANCH where vendorCode = ?");
query.setParameter(0, mf01_vendorCode);
我刚进入休眠状态,因此尝试了一些选择查询选项,但是我不确定这样做是否正确.那么,用于复合键的最佳选择语句是什么?
I'm very new to hibernate so tried a few options for the select query but I'm not sure if it's correct to do it this way. So, what would be the best select statement to use for a composite key??
VENDORBRANCH 类:
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Embeddable;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.IdClass;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import com.parkson.poMain.backend.data.VENDORBRANCH.VBpk;
@SuppressWarnings("serial")
@Entity
@IdClass(VBpk.class)
public class VENDORBRANCH implements Serializable {
@Id
private String vendorCode;
@Id
private String vendorBranchCode;
//getters and setters
// inner class defined for primary key(composite keys)
public static class VBpk implements Serializable {
protected String vendorCode;
protected String vendorBranchCode;
public String getvendorCode() {
return vendorCode;
}
public void vendorCode(String vendorCode) {
this.vendorCode = vendorCode;
}
public String vendorBranchCode() {
return vendorBranchCode;
}
public void vendorBranchCode(String vendorBranchCode) {
this.vendorBranchCode = vendorBranchCode;
}
public VBpk(){}
public VBpk(String vendorCode,String vendorBranchCode){
this.vendorCode = vendorCode;
this.vendorBranchCode = vendorBranchCode;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((vendorBranchCode == null) ? 0 : vendorBranchCode.hashCode());
result = prime * result + ((vendorCode == null) ? 0 : vendorCode.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
VBpk other = (VBpk) obj;
if (vendorBranchCode == null) {
if (other.vendorBranchCode != null)
return false;
} else if (!vendorBranchCode.equals(other.vendorBranchCode))
return false;
if (vendorCode == null) {
if (other.vendorCode != null)
return false;
} else if (!vendorCode.equals(other.vendorCode))
return false;
return true;
}
}
}
我的另一堂课:VENDORCRTERMS
import java.io.Serializable;
import java.util.Date;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
@SuppressWarnings("serial")
@Entity
public class VENDORCRTERMS implements Serializable {
@Id
private String vcrId ;
//This is the foreign key referenced from **VENDORBRANCH class**
@ManyToOne
@JoinColumns( {
@JoinColumn(name="vendorcode", nullable = false),
@JoinColumn(name="vendorBranchCode", nullable = false)} )
private VENDORBRANCH vendorbranch_vendorcode = new VENDORBRANCH();
// foreign key referenced from a different class
@ManyToOne
@JoinColumn(name= "creditterms_credittermscode" , nullable = false)
private CREDITTERMS creditterms_credittermscode = new CREDITTERMS();
//getters and setters
}
推荐答案
VENDORBRANCH
定义了复合主键,但是在VENDORCRTERMS
中,您仅在@JoinColumn
上用作引用.这就是您的情况下的映射外观:
VENDORBRANCH
has defined a composite primary key but in VENDORCRTERMS
you only use on @JoinColumn
for the reference. This is how the mapping should look like in your case:
@ManyToOne
@JoinColumns( {
@JoinColumn(name="vendorCode", referencedColumnName="vendorCode"),
@JoinColumn(name="vendorBranchCode", referencedColumnName="vendorBranchCode")
} )
private VENDORBRANCH vendorbranch_vendorcode
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