Question

数据库表

CREATE TABLE WIES.DEPARTMENT
(
    DEPT_ID               integer  NOT NULL 
        GENERATED BY DEFAULT 
        AS IDENTITY (
            START WITH 100,
            INCREMENT BY 1),
    DEPT_NME              varchar(20) ,
    SEQUENCE_NO           integer ,
    ACTIVE_IND            char(1)  DEFAULT 'Y'
);

实体类

@Entity
@Table(name = "DEPARTMENT", schema = "WIES")
public class Department implements JpaObjectWithName, Serializable
{
    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "DEPT_ID", unique = true, nullable = false)
    private Integer           departmentId;

    @Column(name = "SEQUENCE_NO")
    private int               sequence;

    @Column(name = "DEPT_NME")
    @Size(max = 20, message = "error.department.name.length")
    private String            name;

    @Transient
    private boolean           active;

    public Integer getDepartmentId()
    {
        return departmentId;
    }

    public void setDepartmentId(Integer departmentId)
    {
        this.departmentId = departmentId;
    }

    public String getName()
    {
        return name;
    }

    public void setName(String name)
    {
        this.name = name;
    }

    public int getSequence()
    {
        return sequence;
    }

    public void setSequence(int sequence)
    {
        this.sequence = sequence;
    }

    public boolean isActive()
    {
        return active;
    }

    public void setActive(boolean active)
    {
        this.active = active;
    }

    @Column(name = "ACTIVE_IND")
    public String getActiveString()
    {
        return BooleanUtils.toString(active, "Y", "N");
    }

    public void setActiveString(String activeString)
    {
        this.active = BooleanUtils.toBoolean(activeString);
    }

    @Override
    public String toString()
    {
        return (this.name != null)
            ? this.name : super.toString();
    }

}

DAO

@SuppressWarnings("unchecked")
    public List<Department> getDepartments()
    {
        String jql = "select a from Department a";
        Query query = entityManager.createQuery(jql
            + " order by a.sequence, a.name");
        return (List<Department>) query.getResultList();
    }

从控制台生成的sql语句

2014-06-09 16:31:34,282 DEBUG [org.hibernate.SQL] - <select department0_.DEPT_ID as DEPT_ID1_9_, department0_.DEPT_NME as DEPT_NME2_9_, department0_.SEQUENCE_NO as SEQUENCE3_9_ from WIES.DEPARTMENT department0_ order by department0_.SEQUENCE_NO, department0_.DEPT_NME>

select语句缺少列ACTIVE_IND。如何在select语句中包含它而不在Department类中添加另一个要填充的字段？

原因是我想在boolean字段中使用表单上的复选框，并将其存储到数据库中，它必须是'Y'或'N'以及在表格中显示'Y'或'N'。

Answer 1

这有点非弹性，但在课前的注释部分，您可以添加WHERE注释，如下所示：

@Entity
@Table(name = "DEPARTMENT", schema = "WIES")
@Where(clause = "active_ind = 'Y'" )
public class Department implements JpaObjectWithName, Serializable
{
.....
}

这样，只会选择处于活动状态的记录。

Answer 2

您必须在类上添加注释@Access（AccessType.FIELD），在getActiveString（）方法上添加注释@Access（AccessType.PROPERTY）并将@Transient保留在活动字段上。

字段不从数据库填充

2 个答案: