SelectQueryHandle Class Reference

#include <Table.h>

Inherited by CursorSelect.

List of all members.

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Detailed Description

Things to think about in Tables: Do we need to use transactions to make sure updating multiple rows does the right thing?

• Things left to implement in tables, in rough priority of how they might be done:
• Better handling for inconsistent on disk state in persistent tables.
• Noticing schema changes in persistent tables.
• Allowing schema changes without data loss, maybe.
• Replacing Sleepycat DB with Foldgers Crystals.

And things to implement in queries and optimization, again in rough priority:

• Where clauses that have additional clauses beyond those which match the query plans.
• Using prefixes of concatenated indexes.
• Updates that don't change keys don't need to delete/insert.
• Where clauses with ORs.
• Optimizing range operations (where key > m and key < n).
• Query optimization that chooses between indexes.

Public Member Functions
virtual void	doQuery (const char *tuple)=0
virtual bool	avail () const =0
	Returns true iff there is a row available.
virtual void	evalInto (char *buf)=0
	Evalutate the select list against the current row, into the provided buffer, which must be large enough.
virtual SelectQueryHandle &	operator++ ()=0
	Move to the next row.
virtual	~SelectQueryHandle ()

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Constructor & Destructor Documentation

virtual SelectQueryHandle::~SelectQueryHandle (   )  [virtual]

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Member Function Documentation

virtual bool SelectQueryHandle::avail (   )  const [pure virtual]

Returns true iff there is a row available. Implemented in CursorSelect.

virtual void SelectQueryHandle::doQuery (  const char *  tuple  )  [pure virtual]

Implemented in CursorSelect.

virtual void SelectQueryHandle::evalInto (  char *  buf  )  [pure virtual]

Evalutate the select list against the current row, into the provided buffer, which must be large enough. Implemented in CursorSelect.

virtual SelectQueryHandle& SelectQueryHandle::operator++ (   )  [pure virtual]

Move to the next row. Implemented in CursorSelect.

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The documentation for this class was generated from the following file:

• Table.h

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