DirectQueryKey (EclipseLink 2.7.15, API Reference)

java.lang.Object
- org.eclipse.persistence.mappings.querykeys.QueryKey
- - org.eclipse.persistence.mappings.querykeys.DirectQueryKey

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable
```
public class DirectQueryKey
extends QueryKey
```
Purpose: Define an alias to a database field.
Responsibilities:
- Define the field that is being aliased.
See Also:

Serialized Form

Field Summary
- Fields inherited from class org.eclipse.persistence.mappings.querykeys.QueryKey
  descriptor, name

Constructor Summary

Constructors
Constructor Description

DirectQueryKey()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`org.eclipse.persistence.internal.helper.DatabaseField`	`getField()`	INTERNAL: Return the field for the query key.
`java.lang.String`	`getFieldName()`	PUBLIC: Return the field name for the query key.
`java.lang.String`	`getQualifiedFieldName()`	PUBLIC: Return the qualified field name for the query key.
`void`	`initialize(ClassDescriptor descriptor)`	INTERNAL: Initialize any information in the receiver that requires its descriptor.
`boolean`	`isDirectQueryKey()`	INTERNAL: override the isDirectQueryKey() method in the superclass to return true.
`void`	`setField(org.eclipse.persistence.internal.helper.DatabaseField field)`	INTERNAL: Set the field for the query key.
`void`	`setFieldName(java.lang.String fieldName)`	PUBLIC: Set the field name for the query key.

Methods inherited from class org.eclipse.persistence.mappings.querykeys.QueryKey
clone, convertClassNamesToClasses, getDescriptor, getName, isAbstractQueryKey, isCollectionQueryKey, isDirectCollectionQueryKey, isForeignReferenceQueryKey, isManyToManyQueryKey, isOneToManyQueryKey, isOneToOneQueryKey, isQueryKey, setDescriptor, setName, toString

Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - DirectQueryKey
```
public DirectQueryKey()
```
- Method Detail
  - getField
```
public org.eclipse.persistence.internal.helper.DatabaseField getField()
```
    INTERNAL: Return the field for the query key.
  - getFieldName
```
public java.lang.String getFieldName()
```
    PUBLIC: Return the field name for the query key.
  - getQualifiedFieldName
```
public java.lang.String getQualifiedFieldName()
```
    PUBLIC: Return the qualified field name for the query key.
  - initialize
```
public void initialize(ClassDescriptor descriptor)
```
    INTERNAL: Initialize any information in the receiver that requires its descriptor. Set the receiver's descriptor back reference.
    
    Overrides:
    
    initialize in class QueryKey
    
    Parameters:
    
    descriptor - is the owner descriptor of the receiver.
  - isDirectQueryKey
```
public boolean isDirectQueryKey()
```
    INTERNAL: override the isDirectQueryKey() method in the superclass to return true.
    
    Overrides:
    
    isDirectQueryKey in class QueryKey
    
    Returns:
    
    boolean
  - setField
```
public void setField(org.eclipse.persistence.internal.helper.DatabaseField field)
```
    INTERNAL: Set the field for the query key.
  - setFieldName
```
public void setFieldName(java.lang.String fieldName)
```
    PUBLIC: Set the field name for the query key.