# Interface EJBQLCompiledExpression

public interface EJBQLCompiledExpression
Represents an EJB QL expression "compiled" in the context of a certain mapping.

Since:
  3.0

- ## Method Summary

  Modifier and Type
  Method
  Description
  `ClassDescriptor`
  `getEntityDescriptor(String identifier)`
  Returns a ClassDescriptor for the id variable.
  `EJBQLExpression`
  `getExpression()`
  Returns a tree representation of an EJBQL expression.
  `List<DbRelationship>`
  `getIncomingRelationships(String identifier)`
  Returns a collection of relationships that joins identifier with a parent entity.
  `PrefetchTreeNode`
  `getPrefetchTree()`
  Returns prefetched columns tree for fetch joins.
  `SQLResult`
  `getResult()`
  Returns a mapping of the result set columns, or null if this is not a select expression.
  `ClassDescriptor`
  `getRootDescriptor()`
  Returns a descriptor of the root of this expression such as entity being fetched or updated.
  `String`
  `getSource()`
  Returns EJB QL source of the compiled expression if available.

- ## Method Details

  - ### getExpression

    EJBQLExpression getExpression()
    Returns a tree representation of an EJBQL expression.

  - ### getRootDescriptor

    ClassDescriptor getRootDescriptor()
    Returns a descriptor of the root of this expression such as entity being fetched or updated.

  - ### getEntityDescriptor

    ClassDescriptor getEntityDescriptor(String identifier)
    Returns a ClassDescriptor for the id variable.

  - ### getIncomingRelationships

    List<DbRelationship> getIncomingRelationships(String identifier)
    Returns a collection of relationships that joins identifier with a parent entity. Returns null if the identifier corresponds to one of the query roots.

  - ### getSource

    String getSource()
    Returns EJB QL source of the compiled expression if available.

  - ### getResult

    SQLResult getResult()
    Returns a mapping of the result set columns, or null if this is not a select expression.

  - ### getPrefetchTree

    PrefetchTreeNode getPrefetchTree()
    Returns prefetched columns tree for fetch joins.