/**
* PUBLIC: Specify the foreign-reference mapped attribute to be optimized in this query. The query
* will execute normally, however when any of the batched parts is accessed, the parts will all be
* read in a single query, this allows all of the data required for the parts to be read in a
* single query instead of (n) queries. This should be used when the application knows that it
* requires the part for all of the objects being read. This can be used for one-to-one,
* one-to-many, many-to-many and direct collection mappings.
*
* <p>The use of the expression allows for nested batch reading to be expressed.
*
* <p>Example: query.addBatchReadAttribute("phoneNumbers")
*
* @see #addBatchReadAttribute(Expression)
* @see ObjectLevelReadQuery#addJoinedAttribute(String)
*/
public void addBatchReadAttribute(String attributeName) {
if (!getQueryMechanism().isExpressionQueryMechanism()) {
throw QueryException.batchReadingNotSupported(this);
}
getBatchReadAttributeExpressions().add(getExpressionBuilder().get(attributeName));
}
/**
* INTERNAL: Possible for future development, not currently supported.
*
* <p>Retrieve the value through using batch reading. This executes a single query to read the
* target for all of the objects and stores the result of the batch query in the original query to
* allow the other objects to share the results.
*/
@Override
protected Object batchedValueFromRow(AbstractRecord row, ReadAllQuery query) {
throw QueryException.batchReadingNotSupported(this, query);
}
