[英]Empty Entity after data retrieving from MySQL DB
我有以下實體
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.UniqueConstraint;
import org.hibernate.annotations.Type;
@Entity
@Table(name = "Privilege", uniqueConstraints = @UniqueConstraint(columnNames = "name"))
public class Privilege implements java.io.Serializable {
private static final long serialVersionUID = 8357379972506504809L;
private Long privilegeId;
private String name;
private String description;
public Privilege() {
}
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "privilegeID", unique = true, nullable = false)
public Long getId() {
return this.privilegeId;
}
public void setId(Long privilegeId) {
this.privilegeId = privilegeId;
}
@Column(name = "name", unique = true, length = 45)
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@Column(name = "description", length = 65535)
@Type(type="text")
public String getDescription() {
return this.description;
}
public void setDescription(String description) {
this.description = description;
}
}
它在MySQL數據庫中映射表。 我正在嘗試通過以下QueryDSL代碼檢索數據
public Privilege findByName(final String name) throws EntityNotFoundException {
Privilege workgroupPrivilege = new JPAQuery(getEntityManager())
.from(privilege)
.where(privilege.name.eq(name))
.uniqueResult(privilege);
if (workgroupPrivilege == null)
throw new EntityNotFoundException("Cannot find entity "
+ Privilege.class.getCanonicalName()
+ " with name <" + name + ">");
else
return workgroupPrivilege;
}
問題是findByName()
代碼向我返回了特權實體對象的實例,但是其字段中的數據為空。 這意味着已正確完成Entity-DB Table綁定(否則我將擁有一個空的Privilege Entity實例)。
編輯:
Web應用程序將此字段添加到Privilege的空實例中
handler = org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer@48f52e0b
新增的字段是否可以解決問題?
對您來說可能是什么問題?
由於延遲加載數據,調試器沒有顯示任何數據。
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