public AlterColumnDefinitionCommand(AlterColumnCommand parent, DbType type, bool isNullable)
     : base(parent)
 {
     _type = type;
     _isNullable = isNullable;
 }
 public AlterColumnDefinitionCommand(AlterColumnCommand parent, DbType type, bool isNullable)
     : base(parent)
 {
     _type       = type;
     _isNullable = isNullable;
 }