| private RecordsEqual ( int record1, int record2 ) : bool | ||
| record1 | int | |
| record2 | int | |
| return | bool | |
internal override void CheckConstraint(DataRow childRow, DataRowAction action)
{
if ((action == DataRowAction.Change ||
action == DataRowAction.Add ||
action == DataRowAction.Rollback) &&
Table.DataSet != null && Table.DataSet.EnforceConstraints &&
childRow.HasKeyChanged(_childKey))
{
// This branch is for cascading case verification.
DataRowVersion version = (action == DataRowAction.Rollback) ? DataRowVersion.Original : DataRowVersion.Current;
object[] childKeyValues = childRow.GetKeyValues(_childKey);
// check to see if this is just a change to my parent's proposed value.
if (childRow.HasVersion(version))
{
// this is the new proposed value for the parent.
DataRow parentRow = DataRelation.GetParentRow(ParentKey, ChildKey, childRow, version);
if (parentRow != null && parentRow._inCascade)
{
object[] parentKeyValues = parentRow.GetKeyValues(_parentKey, action == DataRowAction.Rollback ? version : DataRowVersion.Default);
int parentKeyValuesRecord = childRow.Table.NewRecord();
childRow.Table.SetKeyValues(_childKey, parentKeyValues, parentKeyValuesRecord);
if (_childKey.RecordsEqual(childRow._tempRecord, parentKeyValuesRecord))
{
return;
}
}
}
// now check to see if someone exists... it will have to be in a parent row's current, not a proposed.
object[] childValues = childRow.GetKeyValues(_childKey);
if (!IsKeyNull(childValues))
{
Index parentIndex = _parentKey.GetSortIndex();
if (!parentIndex.IsKeyInIndex(childValues))
{
// could be self-join constraint
if (_childKey.Table == _parentKey.Table && childRow._tempRecord != -1)
{
int lo = 0;
for (lo = 0; lo < childValues.Length; lo++)
{
DataColumn column = _parentKey.ColumnsReference[lo];
object value = column.ConvertValue(childValues[lo]);
if (0 != column.CompareValueTo(childRow._tempRecord, value))
{
break;
}
}
if (lo == childValues.Length)
{
return;
}
}
throw ExceptionBuilder.ForeignKeyViolation(ConstraintName, childKeyValues);
}
}
}
}
internal bool HasKeyChanged(DataKey key, DataRowVersion version1, DataRowVersion version2)
{
if (this.HasVersion(version1) && this.HasVersion(version2))
{
return(!key.RecordsEqual(this.GetRecordFromVersion(version1), this.GetRecordFromVersion(version2)));
}
return(true);
}
internal override void CheckConstraint(DataRow childRow, DataRowAction action)
{
Debug.Assert(Table.DataSet != null, "Relation " + ConstraintName + " isn't part of a DataSet, so this check shouldn't be happening.");
if ((action == DataRowAction.Change ||
action == DataRowAction.Add ||
action == DataRowAction.Rollback) &&
Table.DataSet != null && Table.DataSet.EnforceConstraints &&
childRow.HasKeyChanged(childKey))
{
// This branch is for cascading case verification.
DataRowVersion version = (action == DataRowAction.Rollback) ? DataRowVersion.Original : DataRowVersion.Current;
object[] childKeyValues = childRow.GetKeyValues(childKey);
// check to see if this is just a change to my parent's proposed value.
if (childRow.HasVersion(version))
{
// this is the new proposed value for the parent.
DataRow parentRow = DataRelation.GetParentRow(this.ParentKey, this.ChildKey, childRow, version);
if (parentRow != null && parentRow.inCascade)
{
object[] parentKeyValues = parentRow.GetKeyValues(parentKey, action == DataRowAction.Rollback ? version : DataRowVersion.Default);
#if DEBUG
if (CompModSwitches.Data_Constraints.TraceVerbose)
{
Debug.WriteLine("Parent and Child values on constraint check.");
for (int i = 0; i < childKeyValues.Length; i++)
{
Debug.WriteLine("... " + i.ToString() + ": " + Convert.ToString(parentKeyValues[i]) +
", " + Convert.ToString(childKeyValues[i]));
}
}
#endif
int parentKeyValuesRecord = childRow.Table.NewRecord();
childRow.Table.SetKeyValues(childKey, parentKeyValues, parentKeyValuesRecord);
if (childKey.RecordsEqual(childRow.tempRecord, parentKeyValuesRecord))
{
return;
}
}
}
// now check to see if someone exists... it will have to be in a parent row's current, not a proposed.
object[] childValues = childRow.GetKeyValues(childKey);
if (!IsKeyNull(childValues))
{
Index parentIndex = parentKey.GetSortIndex();
if (!parentIndex.IsKeyInIndex(childValues))
{
// could be self-join constraint
if (childKey.Table == parentKey.Table && childRow.tempRecord != -1)
{
int lo = 0;
for (lo = 0; lo < childValues.Length; lo++)
{
if (parentKey.Columns[lo].CompareToValue(childRow.tempRecord, childValues[lo]) != 0)
{
break;
}
}
if (lo == childValues.Length)
{
return;
}
}
throw ExceptionBuilder.ForeignKeyViolation(ConstraintName, childKeyValues);
}
}
}
}
internal bool HasKeyChanged(DataKey key, DataRowVersion version1, DataRowVersion version2)
{
if (!HasVersion(version1) || !HasVersion(version2))
{
return true;
}
return !key.RecordsEqual(GetRecordFromVersion(version1), GetRecordFromVersion(version2));
}
