DarkSide SQL Mini Version 1, The embedded database

/**
Copyright 2000 - 2003 LogicMatrix. All rights reserved. 

This software is distributed under the LogicMatrix Free Software License. This software may be used for any purpose, personal or commercial. Redistributions in binary /source code form are permitted. Commercial redistribution of larger works derived from, or works which bundle this software requires a "Commercial Redistribution License" which can be purchased from LogicMatrix. Contact LogicMatrix for details

Redistributions qualify as Free and non-commercial under one of the following terms:

1) Redistributions are made at no charge beyond the reasonable cost of materials and delivery.
2) Redistributions in binary/source code form must reproduce this Copyright Notice,these license terms, and the disclaimer/limitation of liability set forth as below, in the documentation and/or other materials
provided with the distribution.

Disclaimer
==========
The Software is provided on an "AS IS" basis. No warranty is
provided that the Software is free of defects, or fit for a
particular purpose. 

Limitation of Liability 
=======================
LogicMatrix shall not be liable for any damages suffered by the Licensee or any third party resulting from use of the Software.


**/

/**
	unique.h

	Purpose: Checks if a new value will create duplicate entry in
			 an index file

	Author: Vijay Mathew Pandyalakal
	Date:	21/11/2003
	Copyright: logicmatrix
**/

#include <string>
#include <vector>
using namespace std;

#include "db_cxx.h"

#include "mydate.h"
using namespace openutils;

#include "dsql_m_structs.h"
#include "bridge.h"
#include "sql_lexer.h"
#include "bdb_index.h"
#include "unique.h"
using namespace dsqlm;

Unique::Unique(Table* table,Database* db) {
	if(db == 0) {
		throw DsqlMException("Unique.cpp - database not inited");
	}
	m_db = db;
	this->table = table;
}

bool Unique::check(Column col,const char* new_val,long pos) {
	char db_name[151];
	sprintf(db_name,"%s\\%s_%s_x",m_db->getDBName().c_str(),
		table->getName().c_str(),
		col.getTitle().c_str());
	BdbIndex index(db_name,false);
	index.get(new_val);	
	long sz = index.getCursorSize();
	if(sz <= 0) {
		return false;
	}else {
		try {
			string val = index.getKey(0);
			long dat = index.getData(0);		
			if(dat == pos) 
				return false;
			else 
				return true;
		}catch(...) {
			return true;
		}		
	}
}