Package org.apache.openjpa.kernel

Interface StoreQuery.Executor

All Known Implementing Classes:
AbstractStoreQuery.AbstractExecutor, ExpressionStoreQuery.AbstractExpressionExecutor, ExpressionStoreQuery.DataStoreExecutor, ExpressionStoreQuery.InMemoryExecutor, PreparedSQLStoreQuery.PreparedSQLExecutor, SQLStoreQuery.SQLExecutor, StoredProcedureQuery.StoredProcedureQueryExecutor
Enclosing interface:
StoreQuery
public static interface StoreQuery.Executor
An executor provides a uniform interface to the mechanism for executing either an in-memory or datastore query. In the common case, the executeQuery(org.apache.openjpa.kernel.StoreQuery, java.lang.Object[], org.apache.openjpa.kernel.StoreQuery.Range) method will be called before other methods, though this is not guaranteed.
Author:
Marc Prud'hommeaux

  • Method Details

    • executeQuery

      ResultObjectProvider executeQuery(StoreQuery q, Object[] params, StoreQuery.Range range)
      Return the result of executing this query with the given parameter values. If this query is a projection and this executor does not pack results itself, each element of the returned result object provider should be an object array containing the projection values.
      Parameters:
      lrs - true if the query result should be treated as a large result set, assuming the query is not an aggregate and does not have grouping
      See Also:

    • executeDelete

      Number executeDelete(StoreQuery q, Object[] params)
      Deleted the objects that result from the execution of the query, retuning the number of objects that were deleted.

    • executeUpdate

      Number executeUpdate(StoreQuery q, Object[] params)
      Updates the objects that result from the execution of the query, retuning the number of objects that were updated.

    • getDataStoreActions

      String[] getDataStoreActions(StoreQuery q, Object[] params, StoreQuery.Range range)
      Return a description of the commands that will be sent to the datastore in order to execute the query.

    • validate

      void validate(StoreQuery q)
      Validate components of query.

    • getRange

      void getRange(StoreQuery q, Object[] params, StoreQuery.Range range)
      Mutate the given range to set any range information stored in the query string and/or parameters.

    • getOrderingValue

      Object getOrderingValue(StoreQuery q, Object[] params, Object resultObject, int orderIndex)
      Extract the value of the orderIndexth ordering expression in Query#getOrderingClauses from the given result object. The result object will be an object from the result object provider returned from executeQuery(org.apache.openjpa.kernel.StoreQuery, java.lang.Object[], org.apache.openjpa.kernel.StoreQuery.Range). This method is used when several result lists have to be merged in memory. If this exeuctor's parent query supports executors on abstract or interface classes, this method will not be used.
      See Also:

    • getAscending

      boolean[] getAscending(StoreQuery q)
      Return the ordering direction for all ordering clauses, or empty array if none.

    • isPacking

      boolean isPacking(StoreQuery q)
      Return true if this executor packs projections into the result class itself. Executors for query languages that allow projections without result clauses must return true and perform the result packing themselves.

    • getAlias

      String getAlias(StoreQuery q)
      If this is not a projection but the candidate results are placed into a result class with an alias, return that alias.

    • getProjectionAliases

      String[] getProjectionAliases(StoreQuery q)
      Return the alias for each projection element, or empty array if not a projection.

    • getProjectionTypes

      Class<?>[] getProjectionTypes(StoreQuery q)
      Return the expected types of the projections used by this query, or an empty array if not a projection.

    • getAccessPathMetaDatas

      ClassMetaData[] getAccessPathMetaDatas(StoreQuery q)
      Return an array of all persistent classes used in this query, or empty array if unknown.

    • getOperation

      int getOperation(StoreQuery q)
      Returns the operation this executor is meant to execute.
      See Also:

    • isAggregate

      boolean isAggregate(StoreQuery q)
      Return true if the compiled query is an aggregate.

    • isDistinct

      boolean isDistinct(StoreQuery q)

    • hasGrouping

      boolean hasGrouping(StoreQuery q)
      Whether the compiled query has grouping.

    • getOrderedParameterTypes

      OrderedMap<Object,Class<?>> getOrderedParameterTypes(StoreQuery q)
      Return a map of parameter names to types. The returned Map.entrySet()'s Iterator must return values in the order in which they were declared or used.

    • getParameterTypes

      @Deprecated LinkedMap getParameterTypes(StoreQuery q)
      Deprecated.
      Return a map of parameter names to types. The returned Map.entrySet()'s Iterator must return values in the order in which they were declared or used.
      Warning: Deprecated. Use getOrderedParameterTypes(StoreQuery) instead.

    • toParameterArray

      Object[] toParameterArray(StoreQuery q, Map<?,?> userParams)
      Return an array from the given user parameter values. The array ordering is same as what this executor expects for its executeXXX() methods as its Object[] parameters. If the given userParams is null or empty return an empty array rather than null.
      Returns:
      array with parameter values ordered in the same way as this receiver's executeXXX() method expects.
      Since:
      2.0.0

    • getResultClass

      Class<?> getResultClass(StoreQuery q)
      Returns the result class, if any.

    • getResultShape

      ResultShape<?> getResultShape(StoreQuery q)

    • getUpdates

      Map<FieldMetaData,Value> getUpdates(StoreQuery q)
      Return a map of FieldMetaData to update Constants, in cases where this query is for a bulk update.

    • getQueryExpressions

      QueryExpressions[] getQueryExpressions()
      Return the parsed query expressions for our candidate types. The expressions are available only after query has been parsed.
      Since:
      2.0.0