# Class BatchQuery

java.lang.Object
org.apache.cayenne.query.BatchQuery

All Implemented Interfaces:
  `Serializable, Query`

Direct Known Subclasses:
  `DeleteBatchQuery, InsertBatchQuery, UpdateBatchQuery`

public abstract class BatchQuery extends Object implements Query
BatchQuery and its descendants allow to group similar data for the batch database modifications, including inserts, updates and deletes. Single BatchQuery corresponds to a parameterized PreparedStatement and a matrix of values.

See Also:
  - Serialized Form

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `protected List<DbAttribute>`
  `dbAttributes`
  `protected DbEntity`
  `dbEntity`
  `protected List<BatchQueryRow>`
  `rows`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `BatchQuery(DbEntity dbEntity, List<DbAttribute> dbAttributes, int batchCapacity)`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `SQLAction`
  `createSQLAction(SQLActionVisitor visitor)`
  Calls "batchAction" on the visitor.
  `List<DbAttribute>`
  `getDbAttributes()`
  Returns a list of DbAttributes describing batch parameters.
  `DbEntity`
  `getDbEntity()`
  Returns a DbEntity associated with this batch.
  `QueryMetadata`
  `getMetaData(EntityResolver resolver)`
  Returns default select parameters.
  `List<BatchQueryRow>`
  `getRows()`
  `boolean`
  `isUsingOptimisticLocking()`
  Returns true if the batch query uses optimistic locking.
  `void`
  `route(QueryRouter router, EntityResolver resolver, Query substitutedQuery)`
  A callback method invoked by Cayenne during the routing phase of the query execution.

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### dbEntity

    protected DbEntity dbEntity

  - ### rows

    protected List<BatchQueryRow> rows

  - ### dbAttributes

    protected List<DbAttribute> dbAttributes

- ## Constructor Details

  - ### BatchQuery

    public BatchQuery(DbEntity dbEntity, List<DbAttribute> dbAttributes, int batchCapacity)
    Since:
      4.0

- ## Method Details

  - ### getRows

    public List<BatchQueryRow> getRows()
    Since:
      4.0

  - ### getMetaData

    public QueryMetadata getMetaData(EntityResolver resolver)
    Returns default select parameters.
    Specified by:
      `getMetaData` in interface `Query`
    Since:
      1.2

  - ### route

    public void route(QueryRouter router, EntityResolver resolver, Query substitutedQuery)
    Description copied from interface: `Query`
    A callback method invoked by Cayenne during the routing phase of the query execution. Mapping of DataNodes is provided by QueryRouter. Query should use a `QueryRouter.route(DataNode, Query, Query)` callback method to route itself. Query can create one or more substitute queries or even provide its own DataNode to execute itself.
    Specified by:
      `route` in interface `Query`
    Since:
      1.2

  - ### createSQLAction

    public SQLAction createSQLAction(SQLActionVisitor visitor)
    Calls "batchAction" on the visitor.
    Specified by:
      `createSQLAction` in interface `Query`
    Since:
      1.2

  - ### isUsingOptimisticLocking

    public boolean isUsingOptimisticLocking()
    Returns true if the batch query uses optimistic locking.
    Since:
      1.1

  - ### getDbEntity

    public DbEntity getDbEntity()
    Returns a DbEntity associated with this batch.

  - ### getDbAttributes

    public List<DbAttribute> getDbAttributes()
    Returns a list of DbAttributes describing batch parameters.