// reads a page from persistent storage
private void aReadPageData(StoragePage page, int pageIndex)
{
lock (ManagerLock)
{
page.ReadPageData(this.dataFile, pageIndex);
}
}
private DBHdr ReadDBRoot()
{
DBHdr dbRoot = null;
try
{
StoragePage rootPage = new StoragePage();
rootPage.ReadPageData(this.dataFile, RootPage);
dbRoot = (DBHdr)rootPage.ReadRecord(0);
}
catch (Exception)
{
dbRoot = null;
}
return(dbRoot);
}
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);
}
}
