private void Create(string relationName, DmColumn[] parentColumns, DmColumn[] childColumns)
{
try
{
parentKey = new DmKey(parentColumns);
childKey = new DmKey(childColumns);
if (parentColumns.Length != childColumns.Length)
{
throw new Exception("KeyLengthMismatch");
}
for (int i = 0; i < parentColumns.Length; i++)
{
if ((parentColumns[i].Table.DmSet == null) || (childColumns[i].Table.DmSet == null))
{
throw new Exception("Parent Or Child Columns Do Not Have DmSet");
}
}
CheckState();
RelationName = relationName ?? "";
}
finally
{
}
}
void MergeTable(DmTable src, DmTable dst)
{
if (src.Rows.Count == 0)
{
return;
}
DmKey key = default(DmKey);
try
{
foreach (DmRow sourceRow in src.Rows)
{
DmRow targetRow = null;
if (dst.Rows.Count > 0 && dst.PrimaryKey != null)
{
key = GetSrcKey(src, dst);
var keyValue = sourceRow.GetKeyValues(key);
targetRow = dst.FindByKey(keyValue);
}
dst.MergeRow(sourceRow, targetRow, preserveChanges);
}
}
finally
{
}
}
internal bool Equals(DmKey value)
{
//check to see if this.columns && key2's columns are equal...
DmColumn[] column1 = this.columns;
DmColumn[] column2 = value.columns;
if (column1 == column2)
{
return(true);
}
else if (column1 == null || column2 == null)
{
return(false);
}
else if (column1.Length != column2.Length)
{
return(false);
}
else
{
for (int i = 0; i < column1.Length; i++)
{
if (!column1[i].Equals(column2[i]))
{
return(false);
}
}
return(true);
}
}
internal bool HasKeyChanged(DmKey key, DmRowVersion version1, DmRowVersion version2)
{
if (!HasVersion(version1) || !HasVersion(version2))
{
return(true);
}
return(!key.RecordsEqual(GetRecordFromVersion(version1), GetRecordFromVersion(version2)));
}
internal bool HaveValuesChanged(DmColumn[] rows, DmRowVersion version1, DmRowVersion version2)
{
for (int i = 0; i < rows.Length; i++)
{
CheckColumn(rows[i]);
}
DmKey key = new DmKey(rows); // temporary key, don't copy rows
return(HasKeyChanged(key, version1, version2));
}
/// <summary>
/// Gets the parent rows for the given child row across the relation using the version given
/// </summary>
internal static DmRow[] GetParentRows(DmKey parentKey, DmKey childKey, DmRow childRow, DmRowVersion version)
{
object[] values = childRow.GetKeyValues(childKey, version);
if (IsKeyNull(values))
{
return new DmRow[] { parentKey.Table.NewRow() }
}
;
return(parentKey.Table.Rows.Where(r => parentKey.ValuesAreEqual(r, values)).ToArray());
}
internal void MergeRows(DmRow[] rows)
{
DmTable src = null;
DmTable dst = null;
DmKey key = default(DmKey);
for (int i = 0; i < rows.Length; i++)
{
DmRow row = rows[i];
if (row == null)
{
throw new ArgumentNullException("rows[" + i + "]");
}
if (row.Table == null)
{
throw new ArgumentNullException("rows[" + i + "].Table");
}
//somebody is doing an 'automerge'
if (row.Table.DmSet == dataSet)
{
continue;
}
if (src != row.Table)
{ // row.Table changed from prev. row.
src = row.Table;
dst = MergeSchema(row.Table);
if (dst.PrimaryKey != null)
{
key = GetSrcKey(src, dst);
}
}
if (row.newRecord == -1 && row.oldRecord == -1)
{
continue;
}
DmRow targetRow = null;
dst.MergeRow(row, targetRow, preserveChanges);
}
}
/// <summary>
/// For a foreignkey, actually we have only one row
/// </summary>
internal static DmRow GetParentRow(DmKey parentKey, DmKey childKey, DmRow childRow, DmRowVersion version)
{
if (!childRow.HasVersion((version == DmRowVersion.Original) ? DmRowVersion.Original : DmRowVersion.Current))
{
if (childRow.tempRecord == -1)
{
return(null);
}
}
object[] values = childRow.GetKeyValues(childKey, version);
if (IsKeyNull(values))
{
return(null);
}
return(parentKey.Table.Rows.FirstOrDefault(r => parentKey.ValuesAreEqual(r, values)));
}
internal void SetKeyValues(DmKey key, object[] keyValues)
{
bool fFirstCall = true;
bool immediate = (tempRecord == -1);
for (int i = 0; i < keyValues.Length; i++)
{
object value = this[key.Columns[i]];
if (!value.Equals(keyValues[i]))
{
if (immediate && fFirstCall)
{
fFirstCall = false;
BeginEditInternal();
}
this[key.Columns[i]] = keyValues[i];
}
}
if (!fFirstCall)
{
EndEdit();
}
}
DmKey GetSrcKey(DmTable src, DmTable dst)
{
if (src.PrimaryKey != null)
{
return(src.PrimaryKey);
}
DmKey key = default(DmKey);
if (dst.PrimaryKey != null)
{
DmColumn[] dstColumns = dst.PrimaryKey.Columns;
DmColumn[] srcColumns = new DmColumn[dstColumns.Length];
for (int j = 0; j < dstColumns.Length; j++)
{
srcColumns[j] = src.Columns[dstColumns[j].ColumnName];
}
key = new DmKey(srcColumns); // DmKey will take ownership of srcColumns
}
return(key);
}
internal bool HasKeyChanged(DmKey key)
{
return(HasKeyChanged(key, DmRowVersion.Current, DmRowVersion.Proposed));
}
internal object[] GetKeyValues(DmKey key, DmRowVersion version)
{
int record = GetRecordFromVersion(version);
return(key.GetKeyValues(record));
}
internal object[] GetKeyValues(DmKey key)
{
int record = GetRecordId();
return(key.GetKeyValues(record));
}
internal object[] GetColumnValues(DmColumn[] rows, DmRowVersion version)
{
DmKey key = new DmKey(rows); // temporary key, don't copy rows
return(GetKeyValues(key, version));
}
//internal void CheckState()
//{
// DmTable table = columns[0].Table;
// if (table == null)
// throw new Exception("ColumnNotInAnyTable");
// for (int i = 1; i < columns.Length; i++)
// {
// if (columns[i].Table == null)
// throw new Exception("ColumnNotInAnyTable");
// if (columns[i].Table != table)
// throw new Exception("KeyTableMismatch");
// }
//}
//check to see if this.columns && key2's columns are equal regardless of order
internal bool ColumnsEqual(DmKey key)
{
return(ColumnsEqual(this.columns, ((DmKey)key).columns));
}
