public void SP_TestReadWritePage()
{
string dataFile = "SP_TestData1.tpdb";
if (File.Exists(dataFile))
{
File.Delete(dataFile);
}
TestData[] pageData =
{
new TestData {
data = "Record_0", recordIdx = 0
},
new TestData {
data = "Record_1", recordIdx = 1
},
new TestData {
data = "Record_2", recordIdx = 2
}
};
int pageIndex = int.MinValue;
// write the page
using (FileStreamWrapper dataFileStream = FileStreamWrapper.CreateObject(dataFile))
{
// populate the page with some data
StoragePage page = new StoragePage();
AddRecords(page, pageData);
// write the file to disk
pageIndex = page.WritePageData(dataFileStream, -1);
}
// read the page
using (FileStreamWrapper dataFileStream = FileStreamWrapper.CreateObject(dataFile))
{
// read page from file
StoragePage page = new StoragePage();
page.ReadPageData(dataFileStream, pageIndex);
// validate the page data
ReadRecords(page, pageData);
}
}
private int WriteTopPage(FileStreamWrapper stream, int lastPageAddress)
{
// update the header
ListHdr header = this.pageHeaderList.Pop();
header.NextPageIndex = lastPageAddress;
// update the page
StoragePage page = this.pageList.Pop();
page.WriteRecord(ListHdr.HeaderRecordIdx, header);
// get the page to write to
int pageIdx = header.PageWriteIndex;
// write the page
pageIdx = page.WritePageData(stream, pageIdx);
this.pageIdxList.Insert(0, pageIdx);
return(pageIdx);
}