Defines the type of the descriptor allocated to operate with the interval value.
property DescriptorType: cardinal;
Use the DescriptorType property to define the type of the descriptor that is allocated to operate with the interval value. In most cases you don't need to set this property directly: it is adjusted automatically when working with fields and parameters.
Valid values for this property are:
OCI_DTYPE_TIMESTAMP,
OCI_DTYPE_TIMESTAMP_TZ,
OCI_DTYPE_TIMESTAMP_LTZ.
They are defined in the OraCall unit.