/// <summary>
/// Verify if the insert operation can be performed.
/// </summary>
/// <param name="row"></param>
internal void CheckInsert(object[] row)
{
if (_type == ConstraintType.Main || _type == ConstraintType.Unique)
{
// inserts in the main table are never a problem
// unique constraints are checked by the unique index
return;
}
// must be called synchronized because of _mainData
for (int i = 0; i < _len; i++)
{
object o = row[_refColumns[i]];
if (o == null)
{
// if one column is null then integrity is not checked
return;
}
_mainData[_mainColumns[i]] = o;
}
// a record must exist in the main table
Trace.Check(_mainIndex.Find(_mainData) != null,
Trace.INTEGRITY_CONSTRAINT_VIOLATION);
}
/// <summary>
/// Verify if the delete operation can be performed.
/// </summary>
/// <param name="row"></param>
internal void CheckDelete(object[] row)
{
if (_type == ConstraintType.ForeignKey || _type == ConstraintType.Unique)
{
// deleting references are never a problem
// unique constraints are checked by the unique index
return;
}
// must be called synchronized because of _refData
for (int i = 0; i < _len; i++)
{
object o = row[_mainColumns[i]];
if (o == null)
{
// if one column is null then integrity is not checked
return;
}
_refData[_refColumns[i]] = o;
}
// there must be no record in the 'slave' table
Trace.Check(_refIndex.Find(_refData) == null,
Trace.INTEGRITY_CONSTRAINT_VIOLATION);
}