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RTTS (RunTime Type Services) allows to get the definition of variables or to create them during program execution. RTTS is made of 2 components:

  • RTTI (RunTime Type Identification) is used to get the definition of existing variables or existing types
  • RTTC (RunTime Type Creation) is used to create new variables with any definition; they must be followed by the ABAP statement CREATE DATA ... TYPE HANDLE ... to create the variable.

RTTI and RTTC may be called using methods in CL_ABAP_*DESCR classes. Each class have both RTTI and RTTC methods.

Class

RTTI methods

RTTC methods

Attributes

Comments

CL_ABAP_TYPEDESCR
  |
  |
  |
  |
  |

 

describe_by_data
describe_by_data_ref
describe_by_object_ref
describe_by_name

absolute_name
type_kind
length
decimals
kind

describe_by_name allows to get the definition of a DDIC object.
kind represent the general type (elementary, structure, table, reference, class, interface ) while type_kind represents the detailed type (character, string, flat structure, etc.)

  |‑‑CL_ABAP_DATADESCR
  |   |
  |   |
  |   |
  |   |
  |   |

 

 

is_instantiatable
is_read_only
applies_to_data
applies_to_data_ref
get_data_type_kind

 

  |   |‑‑CL_ABAP_ELEMDESCR
  |   |
  |   |
  |   |
  |   |
  |   |
  |   |
  |   |
  |   |
  |   |
  |   |
  |   |

 

get_n
get_c
get_string
get_xstring
get_i
get_f
get_d
get_t
get_x
get_p

edit_mask
help_id
output_length

 

  |   |‑‑CL_ABAP_REFDESCR
  |   |
  |   |
  |   |

get_referenced_type
get_ref_to_data
get_ref_to_object

create

 

Corresponds to variables "type ref to data" and objects "type ref to object"

  |   |‑‑CL_ABAP_COMPLEXDESCR

 

 

 

  |       |‑‑CL_ABAP_STRUCTDESCR
  |       |
  |       |
  |       |

get_components

create

struct_kind
components
has_include

 

  |       |‑‑CL_ABAP_TABLEDESCR
  |
  |
  |
  |
  |

get_table_line_type

create

key
initial_size
key_defkind
has_unique_key
table_kind

 

  |‑‑CL_ABAP_OBJECTDESCR
      |
      |
      |
      |
      |

 

 

interfaces
types
attributes
methods
events

 

      |‑‑CL_ABAP_CLASSDESCR
      |
      |
      |
      |

get_super_class_type
get_friend_types
get_class_name
is_shared_memory_enabled

 

class_kind
create_visibility

 

      |‑‑CL_ABAP_INTFDESCR

get_interface_type
get_type
get_attribute_type
get_method_parameter_type
get_event_parameter_type

 

intf_kind

 

SAP Training : ABAP351

Links

Details:

3 Comments

  1. Former Member

    Hi,

    I have one question, if I have an internal table in my program, which table name is stored in a variable (for example lv_tabname which is a string) how can I describe the table?

    Unfortunately 

    DESCRIBE (lv_tabname) LINES lv_lines.

    Is not working..(syntax error)

    Do you have any idea how to solve this?

    Thanks in advance!

  2. Former Member

    Hi. 

    Try tis syntax.

    DESCRIBE TABLE 'ITAB' LINES lines.

    Where 'ITAB' is a table that you want to describe and lines is variable where you will find number of lines this table.

  3. Former Member

    why we use this RTTS ? in which pupose we will use this concept?