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The fields attribute is afields is a pointer to the MySQL Item class that contains the fields for a table It is useful in projection operations and maintaining attributes necessary for operations on relations (eg, the propagation of attributes that satisfy expressions but are not part of the result set) The last variable of interest is the preempt_pipeline variable, which is used by the DBXP Execute class to implement a loop in the processing of the data from child nodes Loops are necessary anytime an operation requires iteration through the entire set of data (rows) For example, a join that joins two relations on a common attribute in the absence of indexes that permit ordering may require iteration through one or both child nodes in order to achieve the correct mapping (join) operation This class is also responsible for query optimization (described in 11).

The following code enters the connection string for the active cell s pivot table on a worksheet named Connection, where it can be edited. Store the code on a regular code module. Sub ListConnection() Dim pt As PivotTable Dim ws As Worksheet On Error GoTo err_Handler Set pt = ActiveCell.PivotTable Set ws = Worksheets("Connection") ws.Cells.ClearContents ws.Cells(2, 1).Value = pt.PivotCache.Connection ws.Cells(3, 1).Value = pt.PivotCache.CommandText Exit Sub err_Handler: MsgBox "Connection could not be shown" End Sub Then, follow these steps: 1. Before running the code, create a worksheet named Connection. 2. Select a cell in the pivot table for which you want to view the connection string, and run the ListConnection macro, using a method described in Section 13.1.

It certainly would have worked here Nevertheless, to mimic the real programming problem where a different individual or a group of calls may be made from different parts of a program, we deal with each operation independently Further, this grouping of methods requires altering the exception-handling policy; you now need to address exceptions thrown by any of the called methods together instead of dealing with them separately When we compile the previous class along with the logging aspect and run it, we get the following output:.

Since the query tree provides all of the operations for manipulating the tree and since query optimization is also a set of tree operations, optimization was accomplished using methods placed in a class that wraps the query tree structure (called the query tree class) The optimizer methods implement a heuristic algorithm (described in 11) Execution of these methods results in the reorganization of the tree into a more optimal tree and the separation of some nodes into two or more others that can also be relocated to form a more optimal tree An optimal tree permits a more efficient execution of the query Cost optimization is also supported in this class using an algorithm that walks the tree, applying available indexes to the access methods for each leaf node (nodes that access the relation stores directly).

In chapter 2, we presented a high-level view of the AspectJ programming language and introduced the concepts of aspects and join points. In this chapter, we continue with a more detailed discussion of the constructs of pointcuts and advice, their syntax, and their usages. We also examine a few simple programs that will help strengthen your understanding of the AspectJ constructs. Then we discuss static crosscutting. After reading this chapter, you should be able to start writing short programs in AspectJ. Although the AspectJ syntax may feel somewhat complex in the beginning, once you understand the basic form, it s quite natural for a seasoned Java programmer: An aspect looks like a class, a pointcut looks like a method declaration, and an advice looks like a method implementation. Rest assured that the AspectJ syntax is actually a lot easier than it appears.

The ListConnection macro clears the cells on the Connection worksheet, and enters the connection string for the active cell s pivot table in cell A2. In cell A3, it enters the command text string, that shows the query name and the fields that were used.

This structure can support a wide variety of operations, including restrict, project, join, set, and ordering (sorting) The query node structure is designed to represent each of these operations as a single node and can store all pertinent and required information to execute the operation in place Furthermore, the EXPLAIN command was implemented as a postorder traversal of the tree, printing out the contents of each node starting at the leaves (see the show_plan method later in this chapter) The MySQL equivalent of this operation requires much more computational time and is implemented with a complex set of methods Thus, the query tree is an internal representation that can represent any query and provide a mechanism to optimize the query by manipulating the tree.