125 lines
2.8 KiB
C++
125 lines
2.8 KiB
C++
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/* ---------------------------------------------------------------------------
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Nullsoft Database Engine
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--------------------
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codename: Near Death Experience
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--------------------------------------------------------------------------- */
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/* ---------------------------------------------------------------------------
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Record Class
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--------------------------------------------------------------------------- */
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//#include "record.h"
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#include "../nde.h"
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#include <stdio.h>
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void RecordBase::Retain()
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{
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ref_count++;
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}
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void RecordBase::Release()
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{
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if (--ref_count == 0)
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delete this;
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}
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RecordBase::RecordBase()
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{
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ref_count = 1;
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InsertionPoint = 0;
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}
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//---------------------------------------------------------------------------
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Record::Record(int RecordPos, int insertionPoint, VFILE *TableHandle, Table *ParentTable)
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{
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InsertionPoint = insertionPoint;
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Record *columns = ParentTable->GetColumns();
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int max=columns ? columns->Fields.size() : 128;
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if (RecordPos != 0)
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{
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int n=0;
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uint32_t ThisPos = RecordPos;
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while (ThisPos)
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{
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if (n >= max)
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break;
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Vfseek(TableHandle, ThisPos, SEEK_SET);
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Field Entry (ThisPos);
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Field *TypedEntry = Entry.ReadField(ParentTable, ThisPos, &ThisPos);
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if (!TypedEntry) break; // some db error?
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AddField(TypedEntry);
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n++;
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}
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}
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}
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//---------------------------------------------------------------------------
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RecordBase::~RecordBase()
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{
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Fields.deleteAll();
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}
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ColumnField *Record::GetColumnByName(const char *name)
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{
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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ColumnField *p = (ColumnField *)*itr;
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if (!strcasecmp(p->GetFieldName(), name))
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return p;
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}
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return NULL;
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}
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//---------------------------------------------------------------------------
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int Record::WriteFields(Table *ParentTable, int RecordIndex)
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{
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Field *previous = 0;
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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Field *p = *itr;
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p->WriteField(ParentTable, previous, (Field *)p->next);
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previous = p;
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}
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return WriteIndex(ParentTable, RecordIndex);
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}
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//---------------------------------------------------------------------------
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int Record::WriteIndex(Table *ParentTable, int RecordIndex)
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{
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int P=0;
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if (RecordIndex == NEW_RECORD)
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RecordIndex = ParentTable->index->Insert(InsertionPoint);
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if (!Fields.empty())
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{
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Field *f = *Fields.begin();
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P=f->GetFieldPos();
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}
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return ParentTable->index->Update(RecordIndex, P, this, FALSE);
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}
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//---------------------------------------------------------------------------
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void Record::Delete(Table *ParentTable, int RecordIndex)
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{
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ParentTable->index->Delete(RecordIndex, ParentTable->index->Get(RecordIndex), this);
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}
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void Record::WalkFields(FieldsWalker callback, void *context)
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{
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if (callback)
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{
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for (FieldList::iterator itr=Fields.begin();itr!=Fields.end();itr++)
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{
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if (!callback(this, *itr, context))
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break;
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}
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}
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}
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