ABAP Select data from SAP table /PMG/GE_MPE_SUB_INST_S into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /PMG/GE_MPE_SUB_INST_S table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to /PMG/GE_MPE_SUB_INST_S. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the /PMG/GE_MPE_SUB_INST_S table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_/PMG/GE_MPE_SUB_INST_S TYPE STANDARD TABLE OF /PMG/GE_MPE_SUB_INST_S,
      WA_/PMG/GE_MPE_SUB_INST_S TYPE /PMG/GE_MPE_SUB_INST_S,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: </PMG/GE_MPE_SUB_INST_S> TYPE /PMG/GE_MPE_SUB_INST_S.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/PMG/GE_MPE_SUB_INST_S.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /PMG/GE_MPE_SUB_INST_S
  INTO TABLE IT_/PMG/GE_MPE_SUB_INST_S.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /PMG/GE_MPE_SUB_INST_S
*  INTO TABLE @DATA(IT_/PMG/GE_MPE_SUB_INST_S2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_/PMG/GE_MPE_SUB_INST_S INDEX 1 INTO DATA(WA_/PMG/GE_MPE_SUB_INST_S2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/PMG/GE_MPE_SUB_INST_S ASSIGNING </PMG/GE_MPE_SUB_INST_S>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</PMG/GE_MPE_SUB_INST_S>-OBJECT_ID = 1.
</PMG/GE_MPE_SUB_INST_S>-SUB_GEN_INST = 1.
</PMG/GE_MPE_SUB_INST_S>-OID = 1.
</PMG/GE_MPE_SUB_INST_S>-ENTITY_NAME = 1.
</PMG/GE_MPE_SUB_INST_S>-NODE_TYPE = 1.

ENDLOOP.

LOOP AT IT_/PMG/GE_MPE_SUB_INST_S INTO WA_/PMG/GE_MPE_SUB_INST_S.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/PMG/GE_MPE_SUB_INST_S-ACCMODE, sy-vline,
  WA_/PMG/GE_MPE_SUB_INST_S-INITIALIZED, sy-vline,
  WA_/PMG/GE_MPE_SUB_INST_S-SETUP, sy-vline,
  WA_/PMG/GE_MPE_SUB_INST_S-STORAGE, sy-vline,
  WA_/PMG/GE_MPE_SUB_INST_S-ENTITY, sy-vline,
  WA_/PMG/GE_MPE_SUB_INST_S-BOCBOELNK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/PMG/GE_MPE_SUB_INST_S you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_/PMG/GE_MPE_SUB_INST_S TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_/PMG/GE_MPE_SUB_INST_S INTO WA_/PMG/GE_MPE_SUB_INST_S.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/PMG/GE_MPE_SUB_INST_S_STR, 
OBJECT_ID TYPE STRING,
SUB_GEN_INST TYPE STRING,
OID TYPE STRING,
ENTITY_NAME TYPE STRING,
NODE_TYPE TYPE STRING,
ACCMODE TYPE STRING,
INITIALIZED TYPE STRING,
SETUP TYPE STRING,
STORAGE TYPE STRING,
ENTITY TYPE STRING,
BOCBOELNK TYPE STRING,
STRAT_NAME TYPE STRING,
LOADER TYPE STRING,
DELETED TYPE STRING,
ROOT TYPE STRING,
BOEM TYPE STRING,
MAX_CHILD_SEQ TYPE STRING,
MAX_ENTITY_SEQ TYPE STRING,
LOADED_ENTITIES TYPE STRING,
REFRESHED TYPE STRING,
DB_CHANGES TYPE STRING,
DB_ATTR TYPE STRING,
DB_REL TYPE STRING,
TRANS TYPE STRING,
TID TYPE STRING,
USERFIELD TYPE STRING,
DAO_ATTR TYPE STRING,
DAO_REL TYPE STRING,
HTB_FIN TYPE STRING,
DEPTH TYPE STRING,
IGNORE TYPE STRING,
VISITED TYPE STRING,
SUPRESS_REFRESH TYPE STRING,
BOE_MS_SKSTRING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/PMG/GE_MPE_SUB_INST_S_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_/PMG/GE_MPE_SUB_INST_S_STR-OBJECT_ID sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-SUB_GEN_INST sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-OID sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-ENTITY_NAME sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-NODE_TYPE sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-ACCMODE sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-INITIALIZED sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-SETUP sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-STORAGE sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-ENTITY sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-BOCBOELNK sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-STRAT_NAME sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-LOADER sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-DELETED sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-ROOT sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-BOEM sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-MAX_CHILD_SEQ sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-MAX_ENTITY_SEQ sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-LOADED_ENTITIES sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-REFRESHED sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-DB_CHANGES sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-DB_ATTR sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-DB_REL sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-TRANS sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-TID sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-USERFIELD sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-DAO_ATTR sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-DAO_REL sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-HTB_FIN sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-DEPTH sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-IGNORE sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-VISITED sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-SUPRESS_REFRESH sy-vline 
WA_/PMG/GE_MPE_SUB_INST_S_STR-BOE_MS_SKSTRING sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.