Java 更新单向多对一联接列值
下面是两个实体类。子类具有单向Java 更新单向多对一联接列值,java,spring,hibernate,jpa,Java,Spring,Hibernate,Jpa,下面是两个实体类。子类具有单向@ManyToOne映射 工厂详情: @Entity @Table(name = "PLANT_DETAILS", uniqueConstraints={ @UniqueConstraint(columnNames = {"PLANT"})}) @JsonIgnoreProperties({"hibernateLazyInitializer", "handler", "ignoreUnknown = true"}) public class PlantDetails
@ManyToOne
映射
工厂详情:
@Entity
@Table(name = "PLANT_DETAILS", uniqueConstraints={ @UniqueConstraint(columnNames = {"PLANT"})})
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler", "ignoreUnknown = true"})
public class PlantDetails implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name = "PLANT_ID")
private Long plantId;
@Column(name = "PLANT")
private String plant;
@Column(name = "PLANT_DETAILS")
private String plant_Details;
@Column(name = "LOCATION")
private String location;
@JsonCreator
public PlantDetails( @JsonProperty("plantId") Long plantId,
@JsonProperty("plant") String plant,
@JsonProperty("plant_Details") String plant_Details,
@JsonProperty("location") String location )
{
this.plantId = plantId;
this.plant = plant;
this.plant_Details = plant_Details;
this.location = location;
}
线路详情:
@Entity
@Table(name = "LINE_DETAILS", uniqueConstraints={ @UniqueConstraint(columnNames = { "PLANT", "LINE_NAME" })})
@JsonIgnoreProperties({"hibernateLazyInitializer", "handler", "ignoreUnknown = true"})
public class LineDetails implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name = "LINE_ID")
private Long lineId;
@ManyToOne(cascade=CascadeType.ALL)
@JoinColumn(name="PLANT", referencedColumnName = "PLANT")
private PlantDetails plantDetails;
@Column(name = "LINE_NAME")
private String lineName;
@Column(name = "LINE_DESCRIPTION")
private String lineDescription;
@JsonCreator
public LineDetails( @JsonProperty("lineId") Long lineId,
@JsonProperty("lineName") String lineName,
@JsonProperty("lineDescription") String lineDescription) {
this.lineId = lineId;
this.lineName = lineName;
this.lineDescription = lineDescription;
}
我正在尝试做基本的CRUD操作。下面的代码更新子表。我可以使用setter更新列。但是我无法更新@JoinColumn
字段“plant”,因为我在实体类的@jsoncreator
构造函数中没有它。我如何更新该字段
在创建/插入记录时,我通过从plantdetails entity id列而不是通过@jsoncreator
获取其值来设置@JoinColumn
字段“plant”
在DAOimpl
@Override
public void updateLineDetails(LineDetails lineDetails) {
Session session = this.sessionFactory.getCurrentSession();
LineDetails existinglineDetails = (LineDetails) session.get(LineDetails.class,
lineDetails.getLineId());
existinglineDetails.setLineName(lineDetails.getLineName());
existinglineDetails.setLineDescription(lineDetails.getLineDescription());
session.update(existinglineDetails);
}
您必须以某种方式传递此字段表示的值:
@Column(name = "PLANT")
private String plant;
我通常不会通过实体结构本身传递数据。我将创建额外的LineDetailsInfo
类,该类将在普通字段中保存所有信息
public class LineDetailsInfo{
@JsonCreator
public LineDetails( @JsonProperty("lineId") Long lineId,
@JsonProperty("lineName") String lineName,
@JsonProperty("lineDescription") String lineDescription,
@JsonProperty("plant") String plant) {
this.plant = plant;
this.lineId = lineId;
this.lineName = lineName;
this.lineDescription = lineDescription;
}
}
然后,您需要查询特定的PlantDetails
实体,并相应地更新父实体:
@Override
public void updateLineDetails(LineDetailsInfo lineDetailsInfo) {
Session session = this.sessionFactory.getCurrentSession();
PlantDetails pd = (PlantDetails)session.createQuery("from PlantDetails where plant = :plant")
.setString("plant", lineDetailsInfo.getPlant()).uniqueResult();
LineDetails existinglineDetails = (LineDetails) session.get(LineDetails.class,
lineDetailsInfo.getLineId());
existinglineDetails.setLineName(lineDetailsInfo.getLineName());
existinglineDetails.setPlantDetails(pd);
existinglineDetails.setLineDescription(lineDetailsInfo.getLineDescription())
session.update(existinglineDetails);
}
谢谢你这么好的解决办法。我应该通过新的LineDetailsInfo类或使用旧的LineDetails类执行其他CRUD操作。太好了。很高兴它帮了你的忙。请为创建(持久化)显示。我无法找到“LineDetails existinglineDetails=(LineDetails)session.get(LineDetails.class,lineDetailsInfo.getLineId());”的替换项