在spring-data-jpa架构创建中忽略@Column或@Basic JPA注释

Question

我完全被我希望开箱即用的东西搞糊涂了.所以,要么我做了一些完全错误的事情,要么这只是一个误解.

我试图在JPA Entity类中使用getter/setter注释.我坚持在JPA维基上找到的一个例子(s.http://en.wikibooks.org/wiki/Java_Persistence/Basic_Attributes#Conversion).该示例如下所示:

    @Entity
    public class Employee {
        ...
        private boolean isActive;
        ...
        @Transient
        public boolean getIsActive() {
            return isActive;
        }
        public void setIsActive(boolean isActive) {
            this.isActive = isActive;
        }
        @Basic
        private String getIsActiveValue() {
            if (isActive) {
                return "T";
            } else {
                return "F";
            }
        }
        private void setIsActiveValue(String isActive) {
            this.isActive = "T".equals(isActive);
        }
    }

我采用了最清晰,最干净的spring-data-jpa示例:http://spring.io/guides/gs/accessing-data-jpa/.

我从git中检查出来并更改了他们的示例实体类(s.https://www.chithub.com/spring-guides/gs-accessing-data-jpa/blob/master/complete/src/main/java/hello/Customer .java)看起来如下:

@Entity
public class Customer {

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private long id;
    private String firstName;
    private String lastName;

    protected Customer() {}

    public Customer(String firstName, String lastName) {
        this.firstName = firstName;
        this.lastName = lastName;
    }

    @Override
    public String toString() {
        return String.format(
                "Customer[id=%d, firstName='%s', lastName='%s']",
                id, firstName, lastName);
    }

    @Transient
    private boolean isActive;

    @Transient
    public boolean getIsActive() {
        return isActive;
    }
    public void setIsActive(boolean isActive) {
        this.isActive = isActive;
    }

    @Column
    private String getIsActiveValue() {
        if (isActive) {
            return "T";
        } else {
            return "F";
        }
    }
    private void setIsActiveValue(String isActive) {
        this.isActive = "T".equals(isActive);
    }

}

现在没什么变化.不会创建相应的字符串字段.创建数据库表的日志中的行仍然如下所示:

17:11:10.540 [main] DEBUG o.h.tool.hbm2ddl.SchemaUpdate - create table Customer (id bigint generated by default as identity, firstName varchar(255), lastName varchar(255), primary key (id))

我完全不知道这可能是什么原因.我找不到spring-data-jpa不允许在getter上注释的文档.

任何帮助将非常非常感谢!

Answer 1

我认为你只是简单地混合了注释:你必须注释字段或getter,但不能同时注释两者.一旦您决定注释您的ID字段,您必须注释所有字段(而不是getter),反之亦然:如果您注释了您的getId()方法,则必须注释所有方法.