/// <summary>
/// Clone the current DmSet schema. No rows are imported
/// </summary>
public virtual DmSet Clone()
{
DmSet ds = new DmSet
{
DmSetName = this.DmSetName,
CaseSensitive = this.CaseSensitive,
Culture = this.Culture
};
for (int i = 0; i < Tables.Count; i++)
{
DmTable dt = Tables[i].Clone();
ds.Tables.Add(dt);
}
List <DmRelation> rels = Relations;
for (int i = 0; i < rels.Count; i++)
{
DmRelation rel = rels[i].Clone(ds);
ds.Relations.Add(rel);
}
return(ds);
}
internal void MergeDmSet(DmSet source)
{
if (source == dataSet)
{
return; //somebody is doing an 'automerge'
}
List <DmColumn> existingColumns = null; // need to cache existing columns
existingColumns = new List <DmColumn>(); // need to cache existing columns
foreach (DmTable dt in dataSet.Tables)
{
foreach (DmColumn dc in dt.Columns)
{
existingColumns.Add(dc);
}
}
for (int i = 0; i < source.Tables.Count; i++)
{
MergeTableData(source.Tables[i]); // since column expression might have dependency on relation, we do not set
//column expression at this point. We need to set it after adding relations
}
foreach (DmTable sourceTable in source.Tables)
{
DmTable targetTable;
targetTable = dataSet.Tables.First(s => s.TableName == sourceTable.TableName);
}
}
/// <summary>
/// Copies both the structure and data for this DmSet
/// </summary>
/// <returns></returns>
public DmSet Copy()
{
DmSet dsNew = Clone();
foreach (DmTable table in this.Tables)
{
DmTable destTable = dsNew.Tables.First(t => t.TableName == table.TableName);
foreach (DmRow row in table.Rows)
{
table.ImportRow(row);
}
}
return(dsNew);
}
public DmSet GetChanges(DmRowState rowStates)
{
DmSet dsNew = null;
if (0 != (rowStates & ~(DmRowState.Added | DmRowState.Deleted | DmRowState.Modified | DmRowState.Unchanged)))
{
throw new Exception($"InvalidRowState {rowStates}");
}
// Initialize all the individual table bitmaps.
TableChanges[] bitMatrix = new TableChanges[Tables.Count];
for (int i = 0; i < bitMatrix.Length; ++i)
{
bitMatrix[i] = new TableChanges(Tables[i].Rows.Count);
}
// find all the modified rows and their parents
MarkModifiedRows(bitMatrix, rowStates);
// copy the changes to a cloned table
for (int i = 0; i < bitMatrix.Length; ++i)
{
Debug.Assert(0 <= bitMatrix[i].HasChanges, "negative change count");
if (0 < bitMatrix[i].HasChanges)
{
if (dsNew == null)
{
dsNew = this.Clone();
}
DmTable table = this.Tables[i];
DmTable destTable = dsNew.Tables.First(t => t.TableName == table.TableName);
for (int j = 0; 0 < bitMatrix[i].HasChanges; ++j)
{ // Loop through the rows.
if (bitMatrix[i][j])
{
destTable.ImportRow(table.Rows[j]);
bitMatrix[i].HasChanges--;
}
}
}
}
return(dsNew);
}
internal DmRelation Clone(DmSet destination)
{
DmTable parent = destination.Tables[ParentTable.TableName];
DmTable child = destination.Tables[ChildTable.TableName];
int keyLength = parentKey.Columns.Length;
DmColumn[] parentColumns = new DmColumn[keyLength];
DmColumn[] childColumns = new DmColumn[keyLength];
for (int i = 0; i < keyLength; i++)
{
parentColumns[i] = parent.Columns[ParentKey.Columns[i].ColumnName];
childColumns[i] = child.Columns[ChildKey.Columns[i].ColumnName];
}
DmRelation clone = new DmRelation(RelationName, parentColumns, childColumns);
return(clone);
}
internal DmTableCollection(DmSet set)
{
this.innerSet = set;
}
public DmRelationCollection(DmSet dmSet)
{
this.dmSet = dmSet;
}