#include <hash_table.h>

Inheritance diagram for hash_table:

Public Member Functions
	hash_table (char table_name, char folder_name, int columns_nr, char columns, char columns_searchby, char *unique)
	A constructor.
	hash_table (char table_name, char folder_name, char columns, char columns_searchby, char *unique)
	A constructor.
	~hash_table ()
	A destructor.
void	AddRecord (char column_names, char values)
	Adds a record to the hash table..
void	DeleteRecord (char column_name, char value)
	Deletes the first occurence of a record of column_name which has value.
void	UpdateRecord (char where_column, char where_value, char column_names, char column_values)
	A record updater.
char *	FindRecord (char where_column_name, char where_column_value, char *find_column)
	A record finder.
void	FindByIdAndReturnColNamesAndValues (char id, string &cnames, string &cvalues, char requested_id=0)
	A record finder.
virtual int	getMAXID ()
void	BeginTransaction (char *folder, int id)
void	EndTransaction ()
void	split (char str, int numbers_splitted, char ***splitted)
Protected Member Functions
unsigned	hash (string const &key)
Protected Attributes
std::string	transaction_folder
std::string	table_folder
std::string	tblname
char **	colls_searchby
int	n_cols_sby
int	transaction_id

Detailed Description

Definition at line 1 of file hash_table.h.

Constructor & Destructor Documentation

hash_table::hash_table	(	char *	table_name,
		char *	folder_name,
		int	columns_nr,
		char *	columns,
		char *	columns_searchby,
		char *	unique
	)

A constructor.

Parameters:

table_name	a string parameter that contains the table name.
folder_name	a string parameter that contains the path to the folder of where the files of the hash table are going to be stored ot retrieved.
columns_nr	a number of the columns.
columns	a ; separated names of the columns of the relation.
columns_searchby	a ; separated names of the columns of the relation, which will be use in search, so that indexes for them could be created
unique	the name of the unique identifier column.

If the relation is already created, it is not created again. Only the class is properly initialized. If you want to create a new hash table in the folder, simply erase its contents and run the program with defined instance of this type and this constructor.

Definition at line 24 of file hash_table.cpp.

hash_table::hash_table	(	char *	table_name,
		char *	folder_name,
		char *	columns,
		char *	columns_searchby,
		char *	unique
	)

A constructor.

Parameters:

table_name	a string parameter that contains the table name.
folder_name	a string parameter that contains the path to the folder of where the files of the hash table are going to be stored ot retrieved.
columns	a ; separated names of the columns of the relation.
columns_searchby	a ; separated names of the columns of the relation, which will be use in search, so that indexes for them could be created
unique	the name of the unique identifier column.

If the relation is already created, it is not created again. Only the class is properly initialized. If you want to create a new hash table in the folder, simply erase its contents and run the program with defined instance of this type and this constructor.

Definition at line 18 of file hash_table.cpp.

hash_table::~hash_table ( )

A destructor.

The destructor only destroys the instance of the class, but not the hash table.

Definition at line 153 of file hash_table.cpp.

Member Function Documentation

void hash_table::AddRecord	(	char *	column_names,
		char *	values
	)

Adds a record to the hash table..

Parameters:

column_names	a string parameter that contains ; separated names of the columns of the record.
values	a string parameter that contains ; separated values of the columns of the record.

Reimplemented in tr_twin_ht.

Definition at line 182 of file hash_table.cpp.

void hash_table::BeginTransaction	(	char *	folder,
		int	id
	)

void hash_table::DeleteRecord	(	char *	column_name,
		char *	value
	)

Deletes the first occurence of a record of column_name which has value.

Parameters:

column_name	a string parameter that contains the name of the column.
value	a string parameter that contains the value of the column that the record to be deleted must have

Reimplemented in tr_twin_ht.

Definition at line 417 of file hash_table.cpp.

void hash_table::EndTransaction ( )

Definition at line 939 of file hash_table.cpp.

void hash_table::FindByIdAndReturnColNamesAndValues	(	char *	id,
		string &	cnames,
		string &	cvalues,
		char *	requested_id = `0`
	)

A record finder.

Parameters:

id	a string parameter that contains the id of the record which is to be found
cnames	a string alias which is to be used as a return value of the column names found for the record
cvalues	a string alias which is to be used as a return value of the column values found for the record
requested_id	a pointer to a string which if is not NULL changes the id field value with the value pointed by this pointer

Definition at line 897 of file hash_table.cpp.

char * hash_table::FindRecord	(	char *	where_column_name,
		char *	where_column_value,
		char *	find_column
	)

A record finder.

Parameters:

where_column_name	a string parameter that contains the name of the column by which the record to be found must be searched.
where_column_value	a string parameter that contains the value which determines the record to be found.
find_column	a string parameter that contains the name of the column which value is to be returned

Reimplemented in tr_twin_ht.

Definition at line 606 of file hash_table.cpp.

int hash_table::getMAXID ( ) [virtual]

Reimplemented in tr_twin_ht.

Definition at line 845 of file hash_table.cpp.

unsigned int hash_table::hash ( string const & key ) [protected]

Definition at line 166 of file hash_table.cpp.

void hash_table::split	(	char *	str,
		int *	numbers_splitted,
		char ***	splitted
	)

void hash_table::UpdateRecord	(	char *	where_column,
		char *	where_value,
		char *	column_names,
		char *	column_values
	)

A record updater.

Parameters:

where_column	a string parameter that contains the name of the column by which the record to be updated must be searched.
where_value	a string parameter that contains the value which determines the record to be updated.
column_names	a string parameter that contains ; separated names of the update fields
column_values	a string parameter that contains ; separated values of the update fields

Reimplemented in tr_twin_ht.

Definition at line 718 of file hash_table.cpp.