在Hibernate中是否可以使用实际值而不是问号来打印生成的SQL查询?
如果使用Hibernate API无法打印具有实际值的查询,您会建议如何?
我遇到的问题是一对一的延迟加载在休眠中不起作用.我已经解决了,但仍然没有正确理解会发生什么.
我的代码(延迟加载在这里不起作用,当我拉人 - 地址也被提取):
@Entity
public class Person{
@Id
@SequenceGenerator(name = "person_sequence", sequenceName = "sq_person")
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "person_sequence")
@Column(name = "id")
private long personID;
@OneToOne(mappedBy="person", cascade=CascadeType.ALL, fetch = FetchType.LAZY)
private Adress address;
//.. getters, setters
}
@Entity
public class Address {
@Id
@Column(name="id", unique=true, nullable=false)
@GeneratedValue(generator="gen")
@GenericGenerator(name="gen", strategy="foreign", parameters=@Parameter(name="property", value="person"))
private long personID;
@PrimaryKeyJoinColumn
@OneToOne
private FileInfo person;
}
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但是:如果我添加optional=falseOneToOne关系,延迟加载工作正常!
@OneToOne(mappedBy="person", cascade=CascadeType.ALL, …Run Code Online (Sandbox Code Playgroud)