/// <summary>
/// Adds column to db file.
/// </summary>
/// <param name="column"></param>
internal void AddColumn(LDB_DataColumn column)
{
if (column.ColumnSize < 1)
{
throw new Exception("Invalid column size '" + column.ColumnSize + "' for column '" + column.ColumnName + "' !");
}
// Find free column data area
long currentColumnOffset = m_ColumnsStartOffset;
long freeColumnPosition = -1;
// Loop all columns data areas, see it there any free left
for (int i = 0; i < 100; i++)
{
byte[] columnInfo = new byte[102];
if (ReadFromFile(currentColumnOffset, columnInfo, 0, columnInfo.Length) != columnInfo.Length)
{
throw new Exception("Invalid columns data area length !");
}
// We found unused column data area
if (columnInfo[0] == '\0')
{
freeColumnPosition = currentColumnOffset - 102;
break;
}
currentColumnOffset += 102;
}
if (freeColumnPosition != -1)
{
// TODO: If there is data ???
// Store column
byte[] columnData = column.ToColumnInfo();
WriteToFile(currentColumnOffset, columnData, 0, columnData.Length);
}
else
{
throw new Exception("Couldn't find free column space ! ");
}
}
/// <summary>
/// Adds column to db file.
/// </summary>
/// <param name="column"></param>
internal void AddColumn(LDB_DataColumn column)
{
// Find free column data area
// Set position over version, free data pages count and data page data area size
m_pDbFile.Position = 68;
long freeColumnPosition = -1;
StreamLineReader r = new StreamLineReader(m_pDbFile);
// Loop all columns data areas, see it there any free left
for (int i = 0; i < 100; i++)
{
byte[] columnInfo = r.ReadLine();
if (columnInfo == null)
{
throw new Exception("Invalid columns data area length !");
}
// We found unused column data area
if (columnInfo[0] == '\0')
{
freeColumnPosition = m_pDbFile.Position;
break;
}
}
m_FilePosition = m_pDbFile.Position;
if (freeColumnPosition != -1)
{
// TODO: If there is data ???
// Move to row start
SetFilePosition(GetFilePosition() - 102);
// Store column
byte[] columnData = column.ToColumnInfo();
WriteToFile(columnData, 0, columnData.Length);
}
else
{
throw new Exception("Couldn't find free column space ! ");
}
}
/// <summary>
/// Adds column to db file.
/// </summary>
/// <param name="column"></param>
internal void AddColumn(LDB_DataColumn column)
{
if(column.ColumnSize < 1){
throw new Exception("Invalid column size '" + column.ColumnSize + "' for column '" + column.ColumnName + "' !");
}
// Find free column data area
long currentColumnOffset = m_ColumnsStartOffset;
long freeColumnPosition = -1;
// Loop all columns data areas, see it there any free left
for(int i=0;i<100;i++){
byte[] columnInfo = new byte[102];
if(ReadFromFile(currentColumnOffset,columnInfo,0,columnInfo.Length) != columnInfo.Length){
throw new Exception("Invalid columns data area length !");
}
// We found unused column data area
if(columnInfo[0] == '\0'){
freeColumnPosition = currentColumnOffset - 102;
break;
}
currentColumnOffset += 102;
}
if(freeColumnPosition != -1){
// TODO: If there is data ???
// Store column
byte[] columnData = column.ToColumnInfo();
WriteToFile(currentColumnOffset,columnData,0,columnData.Length);
}
else{
throw new Exception("Couldn't find free column space ! ");
}
}
/// <summary>
/// Adds column to db file.
/// </summary>
/// <param name="column"></param>
internal void AddColumn(LDB_DataColumn column)
{
// Find free column data area
// Set position over version, free data pages count and data page data area size
m_pDbFile.Position = 68;
long freeColumnPosition = -1;
StreamLineReader r = new StreamLineReader(m_pDbFile);
// Loop all columns data areas, see it there any free left
for(int i=0;i<100;i++){
byte[] columnInfo = r.ReadLine();
if(columnInfo == null){
throw new Exception("Invalid columns data area length !");
}
// We found unused column data area
if(columnInfo[0] == '\0'){
freeColumnPosition = m_pDbFile.Position;
break;
}
}
m_FilePosition = m_pDbFile.Position;
if(freeColumnPosition != -1){
// TODO: If there is data ???
// Move to row start
SetFilePosition(GetFilePosition() - 102);
// Store column
byte[] columnData = column.ToColumnInfo();
WriteToFile(columnData,0,columnData.Length);
}
else{
throw new Exception("Couldn't find free column space ! ");
}
}
