/// <summary>
/// Converts a DataTable2 into a DataTable
/// </summary>
/// <returns></returns>
/// <remarks>Can lead to invalid typed data</remarks>
//[Obsolete]
public DataTable ToDataTable()
{
DataTable2 dt2 = this;
DataTable dt = dt2.SchemaOnly.Clone();
dt.TableName = "";
dt.BeginLoadData();
dt.MinimumCapacity = dt2.Rows.Length;
for (int RowIndex = 0; RowIndex < dt2.Rows.Length; RowIndex++)
{
dt.Rows.Add((object[])dt2.Rows[RowIndex]);
}
dt.AcceptChanges();
dt.EndLoadData();
return(dt);
}
/// <summary>
/// Internal use
/// </summary>
/// <returns></returns>
public object Clone()
{
DataTable2 dt2 = new DataTable2(null, null);
dt2.SchemaOnly = SchemaOnly.Clone();
dt2.Rows = new object[Rows.Length];
for (int n = 0; n < Rows.Length; n++)
{
object[] row = (Rows[n] as Object[]);
dt2.Rows[n] = new object[row.Length];
for (int m = 0; m < row.Length; m++)
{
(dt2.Rows[n] as object[])[m] = row[m];
}
}
return(dt2);
}
/// <summary>
/// Called from select when a physical query has been done
/// </summary>
/// <param name="Fields"></param>
/// <param name="From_TableName"></param>
/// <param name="Where_NameCondValue"></param>
/// <param name="dt"></param>
private void QueryCacheSet(string[] Fields, string From_TableName, object[,] Where_NameCondValue,DataTable2 dt)
{
lock(QueryCache)
{
if(QueryCache.Count>=QueryCacheMaxLen)
QueryCache.RemoveAt(0);
QueryCacheEntry q = new QueryCacheEntry();
q.Fields=(string[])Fields.Clone();
q.From_TableName=From_TableName;
q.Where_NameCondValue= new object[Where_NameCondValue.GetLength(0),3];
for(int n=0;n<Where_NameCondValue.GetLength(0);n++)
{
q.Where_NameCondValue[n,0]=Where_NameCondValue[n,0];
q.Where_NameCondValue[n,1]=Where_NameCondValue[n,1];
q.Where_NameCondValue[n,2]=Where_NameCondValue[n,2];
}
q.dt=dt;
QueryCache.Add(q);
}
}
/// <summary>
/// The same as Select but uses a faster DataTable class for large datasets.
/// </summary>
/// <param name="Fields"></param>
/// <param name="From_TableName"></param>
/// <param name="Where_NameCondValue"></param>
/// <returns></returns>
public DataTable2 Select2(string[] Fields, string From_TableName, object[,] Where_NameCondValue)
{
if(Fields==null) Fields = new string[]{"*"};
if(Where_NameCondValue==null) Where_NameCondValue = new object[0,0];
lock(this.TableBlocking)
{
string TableName=From_TableName;
//CheckTable(TableName,false);
Field[] flds = GetFields(TableName);
// map of fields in table
Hashtable FieldMap = new Hashtable();
foreach(Field f in flds)
{
FieldMap[f.Name]=f;
}
// Columns not existent
bool Asterisk=false;
ArrayList SelectedFields = new ArrayList();
for(int n=0;n<Fields.Length;n++)
{
bool bFound=false;
if(Fields[n]=="*")
{
Asterisk=true;
break;
}
foreach(Field f in flds)
{
if(f.Name==Fields[n])
{
bFound=true;
SelectedFields.Add(f);
break;
}
}
if(!bFound)
throw new Exception("Column "+Fields[n]+" unrecognized");
}
if(Asterisk)
{
SelectedFields = new ArrayList(flds);
}
// Consult cache
DataTable2 cacheTable = QueryCacheGet(Fields,From_TableName,Where_NameCondValue);
if(cacheTable!=null) return cacheTable;
// // Remove deletion field
// if(SelectedFields.Contains(DeletedFieldName))
// SelectedFields.Remove(DeletedFieldName);
Set ROWIDS;
ExecuteWhere(From_TableName,Where_NameCondValue,out ROWIDS);
// Build datatable
ICollection dataTableFields;
if(Asterisk)
{
ArrayList al = new ArrayList(flds);
al.RemoveAt(0);// delete field
dataTableFields=al;
}
else
{
dataTableFields=SelectedFields;
}
DataTable2 dt2=null;
DataTable dt = new DataTable(TableName);
foreach(Field f in dataTableFields)
{
System.Type t=null;
switch(f.type)
{
case FieldType.ftBoolean:
t=typeof(bool);
break;
case FieldType.ftDecimal:
t=typeof(decimal);
break;
case FieldType.ftDateTime:
t=typeof(DateTime);
break;
case FieldType.ftInt32:
t=typeof(int);
break;
case FieldType.ftInt64:
t=typeof(long);
break;
case FieldType.ftString:
t=typeof(string);
break;
}
dt.Columns.Add(f.Name,t);
}
if(ROWIDS!=null)
{
int tid = (int)TableName2TID[TableName];
TableNameDef tnd = TID2Def[tid] as TableNameDef;
object[][] result = new object[ROWIDS.Count][];
int fnum=0;
foreach(Field f in dataTableFields)
{
if((!f.bIndexed)||(ROWIDS.Count<2))
{
int valSize = (int)f.DataSize();
long Capacity = (PageSize-ContentPageDataOffset)/valSize;
ArrayList pages = f.DataFID;
if((pages.Count*Capacity)<tnd.rownum)
throw new Exception("Row num corrupted.");
int rownum=0;
foreach(long rowid in ROWIDS)
{
if(fnum==0) result[rownum] = new object[dataTableFields.Count];
long npage = rowid / Capacity;
long offset = rowid % Capacity;
int page = (int)pages[(int)npage];
//br.BaseStream.Position = (page*PageSize)+ContentPageDataOffset+offset*valSize;
//object oldkey = f.ReadData(br);
object oldkey = f.ReadData( this.PageReader(page,ContentPageDataOffset+offset*valSize) );
result[rownum][fnum]=oldkey;
rownum++;
}
}
else
{// accelerator for large rows
Index ndx = GetIndex(TableName,f);
SortedList sl = null;
try
{
sl = ndx.Row2KeySL();
}
catch(Exception ex)
{
this.Close();
this.LogToFile(ex.Message,ex.StackTrace);
throw new Exception("Reverse index error in "+TableName+"."+f.Name+" .");
}
int rownum=0;
foreach(long rowid in ROWIDS)
{
if(fnum==0) result[rownum] = new object[dataTableFields.Count];
object oldkey = sl[rowid];
result[rownum][fnum]=oldkey;
rownum++;
}
}
fnum++;
}
dt2 = new DataTable2(dt,result);
}
else
dt2 = new DataTable2(dt,new object[0]);
QueryCacheSet(Fields,From_TableName,Where_NameCondValue,dt2);
return dt2;
}
}
/// <summary>
/// Internal use
/// </summary>
/// <returns></returns>
public object Clone()
{
DataTable2 dt2 = new DataTable2(null, null);
dt2.SchemaOnly = SchemaOnly.Clone();
dt2.Rows = new object[Rows.Length];
for (int n = 0; n < Rows.Length; n++)
{
object[] row = (Rows[n] as Object[]);
dt2.Rows[n] = new object[row.Length];
for (int m = 0; m < row.Length; m++)
{
(dt2.Rows[n] as object[])[m] = row[m];
}
}
return dt2;
}
