int DirPage::deleteRecords(Where *where, int* attrType, int numOfAttr){
if(DEcount == 0){
lg2("@DirPage_"<<pageid<<" : No Records to delete.");
return 0;
}
DataPage* datapage;
long noOfRecs = 0;
long dataPid;
long maxTFS;
DirEntry *de;
// dirEntries;
for(vector<DirEntry*>::size_type i = 0;
i<dirEntries.size() ; i++){
//create DataPage for every entry and try retreiving records.
de = dirEntries[i];
dataPid = de->getPageID();
datapage = new DataPage(dataPid);
noOfRecs += datapage->deleteRecords(where,attrType,numOfAttr);
maxTFS = datapage->getTotalFreeSize();
de->setTFS(maxTFS);
if(maxSpaceAvailable < maxTFS)
maxSpaceAvailable = maxTFS;
de->writeDE(p,i);
writeToPage();
delete datapage;
}
return noOfRecs;
}
DataPage* DirPage::createDataPage(){
//create a datapage.
//get tfs and store it in DE
if(DEcount == MAX_DE){
error("No Free space to insert DE");
return NULL;
}
DataPage *dp = new DataPage();
long pid = dp->getPageid();
long tfs = dp->getTotalFreeSize();
DirEntry *de = new DirEntry(pid,tfs);
dirEntries.push_back(de);
de->writeDE(p,DEcount);
DEcount++;
if(tfs>maxSpaceAvailable)
maxSpaceAvailable = tfs;
writeToPage();
return dp;
}
long DirPage::updateRecords(Where *where, Modify *modify, RecordSet* rs){
if(DEcount == 0){
lg2("@DirPage_"<<pageid<<" : No Records to update.");
return 0;
}
DataPage* datapage;
long noOfRecs = 0;
long dataPid;
long maxTFS;
DirEntry *de;
// dirEntries;
for(vector<DirEntry*>::size_type i = modify->getStartDirEntry();
i<dirEntries.size() ; i++){
//create DataPage for every entry and try retreiving records.
de = dirEntries[i];
dataPid = de->getPageID();
datapage = new DataPage(dataPid);
noOfRecs += datapage->updateRecords(where,modify,rs);
maxTFS = datapage->getTotalFreeSize();
de->setTFS(maxTFS);
if(maxSpaceAvailable < maxTFS)
maxSpaceAvailable = maxTFS;
de->writeDE(p,i);
if(modify->isThereMore()){
writeToPage();
modify->setStartDirEntry(i);
delete datapage;
return noOfRecs;
}
delete datapage;
}
writeToPage();
return noOfRecs;
}