FileScan Class Reference

#include <filescan.h>

Inheritance diagram for FileScan:

Collaboration diagram for FileScan:

Public Member Functions
	FileScan (FileId rel_id, FileId result_id, std::vector< FieldId > fields, std::vector< Comp > comps, std::vector< void * > values, Catalog *catalog)
	Constructor for FileScan select operation.
	~FileScan ()
	Destructor for FileScan. Deletes dynamic member variables.
void	runOperation ()
	Runs the filescan operation. All tuples of the relations will be looped over and checked against the value and comparison conditions. For each tuple, if it passes these conditions, it will be added to the result file.
Public Member Functions inherited from Select
	Select (FileId rel_id, FileId result_id, std::vector< FieldId > fields, std::vector< Comp > comps, std::vector< void * > values, Catalog *catalog)
	Constructor for Select operation. Both FileScan and IndexScan use this constructor.
	~Select ()
	Destructor for the Select Operation.
Public Member Functions inherited from Operation
	Operation (FileId result_id, Catalog *catalog)
	Constructor for the Operation class. Because Operation is an abstract class, an object cannot be created, but this constructor is used by derived classes.
virtual	~Operation ()
	Destructor for the Operation class. Cleans up dynamic memory in result state.

Additional Inherited Members
Protected Member Functions inherited from Operation
void	_initState (FileId file_id, std::vector< FieldId > fields, fileState *state)
	Performs the file and temporary record setup for relational operators.
void	_delState (fileState *file_state)
	Deletes objects created in relop structs.
Protected Attributes inherited from Select
std::vector< FieldId >	fields
std::vector< Comp >	comps
std::vector< void * >	values
fileState	file_state
Protected Attributes inherited from Operation
fileState	result_state
Catalog *	catalog

Detailed Description

Select is an abstract class that lays the foundation for select operations

Constructor & Destructor Documentation

FileScan()

FileScan::FileScan	(	FileId	rel_id,
		FileId	result_id,
		std::vector< FieldId >	fields,
		std::vector< Comp >	comps,
		std::vector< void * >	values,
		Catalog *	catalog
	)

Constructor for FileScan select operation.

Parameters

rel_id.	File id for the relation file.
result_id.	File id for the result file
fields.	Vector of field ids for the select operation.
comps.	Vector of Comps for the select operation.
values.	Vector of Void * for the select operation.

Member Function Documentation

runOperation()

void FileScan::runOperation ( )

virtual

Runs the filescan operation. All tuples of the relations will be looped over and checked against the value and comparison conditions. For each tuple, if it passes these conditions, it will be added to the result file.

Precondition

Valid files and parameters have been passed to the contructor.

Postcondition

Result file has been populated with records that meet the criteria of the operation.

Implements Operation.

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

• filescan.h