[英]JPQL: unknown state or association field (EclipseLink)
我有一個繼承自Person和OrganizationalUnit的Employee實體:
組織單元:
@MappedSuperclass
public abstract class OrganizationalUnit implements Serializable
{
@Id
private Long id;
@Basic( optional = false )
private String name;
public Long getId()
{
return this.id;
}
public void setId( Long id )
{
this.id = id;
}
public String getName()
{
return this.name;
}
public void setName( String name )
{
this.name = name;
}
// ...
}
人:
@MappedSuperclass
public abstract class Person extends OrganizationalUnit
{
private String lastName;
private String firstName;
public String getLastName()
{
return this.lastName;
}
public void setLastName( String lastName )
{
this.lastName = lastName;
}
public String getFirstName()
{
return this.firstName;
}
public void setFirstName( String firstName )
{
this.firstName = firstName;
}
/**
* Returns names of the form "John Doe".
*/
@Override
public String getName()
{
return this.firstName + " " + this.lastName;
}
@Override
public void setName( String name )
{
throw new UnsupportedOperationException( "Name cannot be set explicitly!" );
}
/**
* Returns names of the form "Doe, John".
*/
public String getFormalName()
{
return this.lastName + ", " + this.firstName;
}
// ...
}
員工實體:
@Entity
@Table( name = "EMPLOYEES" )
@AttributeOverrides
(
{
@AttributeOverride( name = "id", column = @Column( name = "EMPLOYEE_ID" ) ),
@AttributeOverride( name = "name", column = @Column( name = "LASTNAME", insertable = false, updatable = false ) ),
@AttributeOverride( name = "firstName", column = @Column( name = "FIRSTNAME" ) ),
@AttributeOverride( name = "lastName", column = @Column( name = "LASTNAME" ) ),
}
)
@NamedQueries
(
{
@NamedQuery( name = "Employee.FIND_BY_FORMAL_NAME",
query = "SELECT emp " +
"FROM Employee emp " +
"WHERE emp.formalName = :formalName" )
}
)
public class Employee extends Person
{
@Column( name = "EMPLOYEE_NO" )
private String nbr;
// lots of other stuff...
}
然后,我嘗試使用上面的查詢以正式名稱找到一名雇員,例如“Doe,John”:
SELECT emp
FROM Employee emp
WHERE emp.formalName = :formalName
但是,這給我一個關於部署到EclipseLink的例外:
Exception while preparing the app : Exception [EclipseLink-8030] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Error compiling the query [Employee.FIND_BY_CLIENT_AND_FORMAL_NAME: SELECT emp FROM Employee emp JOIN FETCH emp.client JOIN FETCH emp.unit WHERE emp.client.id = :clientId AND emp.formalName = :formalName], line 1, column 115: unknown state or association field [formalName] of class [de.bnext.core.common.entity.Employee].
Local Exception Stack:
Exception [EclipseLink-8030] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.JPQLException
Exception Description: Error compiling the query [Employee.FIND_BY_CLIENT_AND_FORMAL_NAME: SELECT emp FROM Employee emp JOIN FETCH emp.client JOIN FETCH emp.unit WHERE emp.client.id = :clientId AND emp.formalName = :formalName], line 1, column 115: unknown state or association field [formalName] of class [de.bnext.core.common.entity.Employee].
QS:
怎么了? 是否禁止在JPQL中使用“人工”屬性,這里是WHERE子句? 這里的前提是什么?
我檢查了大寫和拼寫很多次,我運氣不好。
您的類沒有formalName的映射,因此不能在查詢中使用它。 您只能訪問查詢中的映射。 無論如何,數據庫中沒有FormalName,所以我看不出它是如何使用的。
您需要更改您的查詢以訪問名字和姓氏,方法與嘗試在getFormalName代碼中進行操作相同:
"SELECT emp FROM Employee emp JOIN FETCH emp.client JOIN FETCH emp.unit WHERE emp.client.id = :clientId AND CONCAT(CONCAT(emp.lastName, ', '), emp.firstName) = :formalName"
請注意,您的OrganizationalUnit類在其字段上有注釋,因此只有字段具有默認映射。 這意味着您的表中將包含firstName,LastName和Name字段,盡管getName in Person定義名稱為this.firstName +“”+ this.lastName。 我建議刪除Person中的firstName / lastName字段,而不是處理name字段,或者可以從OrganizationalUnit中刪除name字段,讓子類以自己的方式處理get / setname訪問器。
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