ABAP Select data from SAP table /SAPAPO/DMCHKREQ into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SAPAPO/DMCHKREQ 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 /SAPAPO/DMCHKREQ. 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 /SAPAPO/DMCHKREQ 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_/SAPAPO/DMCHKREQ TYPE STANDARD TABLE OF /SAPAPO/DMCHKREQ,
      WA_/SAPAPO/DMCHKREQ TYPE /SAPAPO/DMCHKREQ,
      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: </SAPAPO/DMCHKREQ> TYPE /SAPAPO/DMCHKREQ.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/DMCHKREQ
*  INTO TABLE @DATA(IT_/SAPAPO/DMCHKREQ2).
*--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_/SAPAPO/DMCHKREQ INDEX 1 INTO DATA(WA_/SAPAPO/DMCHKREQ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/DMCHKREQ>-PEGID = 1.
</SAPAPO/DMCHKREQ>-MATID = 1.
</SAPAPO/DMCHKREQ>-LOCID = 1.
</SAPAPO/DMCHKREQ>-ACCID = 1.
</SAPAPO/DMCHKREQ>-SUBLOC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/DMCHKREQ-VERSION, sy-vline,
  WA_/SAPAPO/DMCHKREQ-CAT, sy-vline,
  WA_/SAPAPO/DMCHKREQ-R3OBJ, sy-vline,
  WA_/SAPAPO/DMCHKREQ-ORDID, sy-vline,
  WA_/SAPAPO/DMCHKREQ-TMPFLG, sy-vline,
  WA_/SAPAPO/DMCHKREQ-DELNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/DMCHKREQ 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_/SAPAPO/DMCHKREQ 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_/SAPAPO/DMCHKREQ INTO WA_/SAPAPO/DMCHKREQ.


*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.

*Conversion exit TSTPS, internal->external for field DURTMS
CALL FUNCTION 'CONVERSION_EXIT_TSTPS_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/DMCHKREQ-DURTMS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/DMCHKREQ-DURTMS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/DMCHKREQ-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/DMCHKREQ-LOGSYS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_/SAPAPO/DMCHKREQ_STR, 
PEGID TYPE STRING,
MATID TYPE STRING,
LOCID TYPE STRING,
ACCID TYPE STRING,
SUBLOC TYPE STRING,
VERSION TYPE STRING,
CAT TYPE STRING,
R3OBJ TYPE STRING,
ORDID TYPE STRING,
TMPFLG TYPE STRING,
DELNR TYPE STRING,
DELPS TYPE STRING,
POSGUID TYPE STRING,
CHMOD TYPE STRING,
PRREG TYPE STRING,
TRTYP TYPE STRING,
RESMOD TYPE STRING,
DELTAIND TYPE STRING,
UPDIND TYPE STRING,
CHKIND TYPE STRING,
DMALL TYPE STRING,
TMSFR TYPE STRING,
TMSTO TYPE STRING,
ALLRN TYPE STRING,
ATPRN TYPE STRING,
PLNRN TYPE STRING,
CUOBJ TYPE STRING,
CONFR TYPE STRING,
PRODTYP TYPE STRING,
BOMEX TYPE STRING,
BOMLVL TYPE STRING,
REQIDX TYPE STRING,
IDX TYPE STRING,
KOSCH TYPE STRING,
DURTMS TYPE STRING,
REQTYP TYPE STRING,
LOGSYS TYPE STRING,
SCHIND TYPE STRING,
PSSPARAM TYPE STRING,
SOS_EXECUTE TYPE STRING,
SOS_EXECUTE_METH TYPE STRING,
RNDFLAG TYPE STRING,
RND_OBJECT TYPE STRING,
PACTYPE TYPE STRING,
ALETPO TYPE STRING,
SCENA TYPE STRING,
ETENR TYPE STRING,
REVERSAL TYPE STRING,
BDGRP TYPE STRING,
CHAID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/DMCHKREQ_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_/SAPAPO/DMCHKREQ_STR-PEGID sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-MATID sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-LOCID sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-ACCID sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-SUBLOC sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-VERSION sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-CAT sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-R3OBJ sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-ORDID sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-TMPFLG sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-DELNR sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-DELPS sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-POSGUID sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-CHMOD sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-PRREG sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-TRTYP sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-RESMOD sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-DELTAIND sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-UPDIND sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-CHKIND sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-DMALL sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-TMSFR sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-TMSTO sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-ALLRN sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-ATPRN sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-PLNRN sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-CUOBJ sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-CONFR sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-PRODTYP sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-BOMEX sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-BOMLVL sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-REQIDX sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-IDX sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-KOSCH sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-DURTMS sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-REQTYP sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-LOGSYS sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-SCHIND sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-PSSPARAM sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-SOS_EXECUTE sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-SOS_EXECUTE_METH sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-RNDFLAG sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-RND_OBJECT sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-PACTYPE sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-ALETPO sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-SCENA sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-ETENR sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-REVERSAL sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-BDGRP sy-vline 
WA_/SAPAPO/DMCHKREQ_STR-CHAID sy-vline      INTO ld_text SEPARATED BY SPACE.

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