ABAP Select data from SAP table TRGS_MIGR_ALV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TRGS_MIGR_ALV 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 TRGS_MIGR_ALV. 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 TRGS_MIGR_ALV 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_TRGS_MIGR_ALV TYPE STANDARD TABLE OF TRGS_MIGR_ALV,
      WA_TRGS_MIGR_ALV TYPE TRGS_MIGR_ALV,
      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: <TRGS_MIGR_ALV> TYPE TRGS_MIGR_ALV.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TRGS_MIGR_ALV
  INTO TABLE IT_TRGS_MIGR_ALV.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TRGS_MIGR_ALV
*  INTO TABLE @DATA(IT_TRGS_MIGR_ALV2).
*--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_TRGS_MIGR_ALV INDEX 1 INTO DATA(WA_TRGS_MIGR_ALV2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TRGS_MIGR_ALV ASSIGNING <TRGS_MIGR_ALV>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TRGS_MIGR_ALV>-MIGR_STEP = 1.
<TRGS_MIGR_ALV>-MIGR_STEP_EXTERN = 1.
<TRGS_MIGR_ALV>-MIGR_TEXT = 1.
<TRGS_MIGR_ALV>-FLAG = 1.
<TRGS_MIGR_ALV>-MIGR_STATE = 1.

ENDLOOP.

LOOP AT IT_TRGS_MIGR_ALV INTO WA_TRGS_MIGR_ALV.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TRGS_MIGR_ALV-EXECUTE, sy-vline,
  WA_TRGS_MIGR_ALV-REVERSE, sy-vline,
  WA_TRGS_MIGR_ALV-EXE_DATE, sy-vline,
  WA_TRGS_MIGR_ALV-EXE_TIME, sy-vline,
  WA_TRGS_MIGR_ALV-EXE_USER, sy-vline,
  WA_TRGS_MIGR_ALV-REV_DATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TRGS_MIGR_ALV 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_TRGS_MIGR_ALV 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_TRGS_MIGR_ALV INTO WA_TRGS_MIGR_ALV.


*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_TRGS_MIGR_ALV_STR, 
MIGR_STEP TYPE STRING,
MIGR_STEP_EXTERN TYPE STRING,
MIGR_TEXT TYPE STRING,
FLAG TYPE STRING,
MIGR_STATE TYPE STRING,
EXECUTE TYPE STRING,
REVERSE TYPE STRING,
EXE_DATE TYPE STRING,
EXE_TIME TYPE STRING,
EXE_USER TYPE STRING,
REV_DATE TYPE STRING,
REV_TIME TYPE STRING,
REV_USER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TRGS_MIGR_ALV_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_TRGS_MIGR_ALV_STR-MIGR_STEP sy-vline 
WA_TRGS_MIGR_ALV_STR-MIGR_STEP_EXTERN sy-vline 
WA_TRGS_MIGR_ALV_STR-MIGR_TEXT sy-vline 
WA_TRGS_MIGR_ALV_STR-FLAG sy-vline 
WA_TRGS_MIGR_ALV_STR-MIGR_STATE sy-vline 
WA_TRGS_MIGR_ALV_STR-EXECUTE sy-vline 
WA_TRGS_MIGR_ALV_STR-REVERSE sy-vline 
WA_TRGS_MIGR_ALV_STR-EXE_DATE sy-vline 
WA_TRGS_MIGR_ALV_STR-EXE_TIME sy-vline 
WA_TRGS_MIGR_ALV_STR-EXE_USER sy-vline 
WA_TRGS_MIGR_ALV_STR-REV_DATE sy-vline 
WA_TRGS_MIGR_ALV_STR-REV_TIME sy-vline 
WA_TRGS_MIGR_ALV_STR-REV_USER sy-vline      INTO ld_text SEPARATED BY SPACE.

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