Examples of org.apache.derby.iapi.sql.Activation

org.apache.derby.iapi.sql.Activation
An activation contains all the local state information necessary to execute a re-entrant PreparedStatement. The way it will actually work is that a PreparedStatement will have an executable plan, which will be a generated class. All of the local state will be variables in the class. Creating a new instance of the executable plan will create the local state variables. This means that an executable plan must implement this interface, and that the PreparedStatement.getActivation() method will do a "new" operation on the executable plan.
The fixed implementations of Activation in the Execution impl package are used as skeletons for the classes generated for statements when they are compiled.
There are no fixed implementations of Activation for statements; a statement has an activation generated for it when it is compiled.

   * @param activation the activation
   */
  private SQLSessionContext getCurrentSQLSessionContext(Activation activation) {
    SQLSessionContext curr;


    Activation parent = activation.getParentActivation();


    if (parent == null ) {
      // top level
      curr = getTopLevelSQLSessionContext();
    } else {
      // inside a nested connection (stored procedure/function), or when
      // executing a substatement the SQL session context is maintained
      // in the activation of the parent
      curr = parent.getSQLSessionContextForChildren();
    }


    return curr;
  }

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    // try to remember the SQL statement in case anybody asks for it
    SQLText = sql;    


    try {
      Activation activation;
      try {
        PreparedStatement preparedStatement = lcc.prepareInternalStatement
            (lcc.getDefaultSchema(), sql, resultSetConcurrency==
                        java.sql.ResultSet.CONCUR_READ_ONLY, false);
        activation =
          preparedStatement.getActivation(lcc, resultSetType ==
                        java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE);
        checkRequiresCallableStatement(activation);
       } catch (Throwable t) {
        throw handleException(t);
       }




      // this is for a Statement execution
      activation.setSingleExecution();


      //bug 4838 - save the auto-generated key information in activation. keeping this
      //information in lcc will not work work it can be tampered by a nested trasaction
      if (autoGeneratedKeys == Statement.RETURN_GENERATED_KEYS)
        activation.setAutoGeneratedKeysResultsetInfo(columnIndexes, columnNames);
      return executeStatement(activation, executeQuery, executeUpdate);
    } finally {
        restoreContextStack();
    }
    }

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   */
  public ResultSet getInsertResultSet(NoPutResultSet source, GeneratedMethod generationClauses,
                    GeneratedMethod checkGM)
    throws StandardException
  {
    Activation activation = source.getActivation();
    getAuthorizer(activation).authorize(activation, Authorizer.SQL_WRITE_OP);
    return new InsertResultSet(source, generationClauses, checkGM, activation );
  }

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  public ResultSet getInsertVTIResultSet(NoPutResultSet source, 
                    NoPutResultSet vtiRS
                    )
    throws StandardException
  {
    Activation activation = source.getActivation();
    getAuthorizer(activation).authorize(activation, Authorizer.SQL_WRITE_OP);
    return new InsertVTIResultSet(source, vtiRS, activation );
  }

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    @exception StandardException thrown on error
   */
  public ResultSet getDeleteVTIResultSet(NoPutResultSet source)
    throws StandardException
  {
    Activation activation = source.getActivation();
    getAuthorizer(activation).authorize(activation, Authorizer.SQL_WRITE_OP);
    return new DeleteVTIResultSet(source, activation);
  }

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    @exception StandardException thrown on error
   */
  public ResultSet getDeleteResultSet(NoPutResultSet source)
      throws StandardException
  {
    Activation activation = source.getActivation();
    getAuthorizer(activation).authorize(activation, Authorizer.SQL_WRITE_OP);
    return new DeleteResultSet(source, activation );
  }

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                         int constantActionItem,
                         ResultSet[] dependentResultSets,
                         String resultSetId)
    throws StandardException
  {
    Activation activation = source.getActivation();
    getAuthorizer(activation).authorize(activation, Authorizer.SQL_WRITE_OP);
    return new DeleteCascadeResultSet(source, activation, 
                      constantActionItem,
                      dependentResultSets, 
                      resultSetId);

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   */
  public ResultSet getUpdateResultSet(NoPutResultSet source, GeneratedMethod generationClauses,
                    GeneratedMethod checkGM)
      throws StandardException
  {
    Activation activation = source.getActivation();
    //The stress test failed with null pointer exception in here once and then
    //it didn't happen again. It can be a jit problem because after this null
    //pointer exception, the cleanup code in UpdateResultSet got a null
    //pointer exception too which can't happen since the cleanup code checks
    //for null value before doing anything.

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    @exception StandardException thrown on error
   */
  public ResultSet getUpdateVTIResultSet(NoPutResultSet source)
      throws StandardException
  {
    Activation activation = source.getActivation();
    getAuthorizer(activation).authorize(activation, Authorizer.SQL_WRITE_OP);
    return new UpdateVTIResultSet(source, activation);
  }

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                           GeneratedMethod checkGM,
                           int constantActionItem,
                           int rsdItem)
      throws StandardException
  {
    Activation activation = source.getActivation();
    getAuthorizer(activation).authorize(activation, Authorizer.SQL_WRITE_OP);
    return new UpdateResultSet(source, generationClauses, checkGM, activation,
                   constantActionItem, rsdItem);
  }

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