ABAP Select data from SAP table MEPOHEADER_TECH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MEPOHEADER_TECH
*  INTO TABLE @DATA(IT_MEPOHEADER_TECH2).
*--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_MEPOHEADER_TECH INDEX 1 INTO DATA(WA_MEPOHEADER_TECH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MEPOHEADER_TECH>-MANDT = 1.
<MEPOHEADER_TECH>-BSTYP = 1.
<MEPOHEADER_TECH>-BSAKZ = 1.
<MEPOHEADER_TECH>-LPONR = 1.
<MEPOHEADER_TECH>-KNUMV = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MEPOHEADER_TECH-KALSM, sy-vline,
  WA_MEPOHEADER_TECH-STAFO, sy-vline,
  WA_MEPOHEADER_TECH-EXNUM, sy-vline,
  WA_MEPOHEADER_TECH-FRGGR, sy-vline,
  WA_MEPOHEADER_TECH-FRGSX, sy-vline,
  WA_MEPOHEADER_TECH-FRGRL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MEPOHEADER_TECH 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_MEPOHEADER_TECH 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_MEPOHEADER_TECH INTO WA_MEPOHEADER_TECH.


*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 ALPHA, internal->external for field STAFO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MEPOHEADER_TECH-STAFO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEPOHEADER_TECH-STAFO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ADDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MEPOHEADER_TECH-ADDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MEPOHEADER_TECH-ADDNR.
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_MEPOHEADER_TECH_STR, 
MANDT TYPE STRING,
BSTYP TYPE STRING,
BSAKZ TYPE STRING,
LPONR TYPE STRING,
KNUMV TYPE STRING,
KALSM TYPE STRING,
STAFO TYPE STRING,
EXNUM TYPE STRING,
FRGGR TYPE STRING,
FRGSX TYPE STRING,
FRGRL TYPE STRING,
LANDS TYPE STRING,
STCEG TYPE STRING,
ADDNR TYPE STRING,
KORNR TYPE STRING,
MEMORY TYPE STRING,
MEMORYTYPE TYPE STRING,
ID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MEPOHEADER_TECH_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_MEPOHEADER_TECH_STR-MANDT sy-vline 
WA_MEPOHEADER_TECH_STR-BSTYP sy-vline 
WA_MEPOHEADER_TECH_STR-BSAKZ sy-vline 
WA_MEPOHEADER_TECH_STR-LPONR sy-vline 
WA_MEPOHEADER_TECH_STR-KNUMV sy-vline 
WA_MEPOHEADER_TECH_STR-KALSM sy-vline 
WA_MEPOHEADER_TECH_STR-STAFO sy-vline 
WA_MEPOHEADER_TECH_STR-EXNUM sy-vline 
WA_MEPOHEADER_TECH_STR-FRGGR sy-vline 
WA_MEPOHEADER_TECH_STR-FRGSX sy-vline 
WA_MEPOHEADER_TECH_STR-FRGRL sy-vline 
WA_MEPOHEADER_TECH_STR-LANDS sy-vline 
WA_MEPOHEADER_TECH_STR-STCEG sy-vline 
WA_MEPOHEADER_TECH_STR-ADDNR sy-vline 
WA_MEPOHEADER_TECH_STR-KORNR sy-vline 
WA_MEPOHEADER_TECH_STR-MEMORY sy-vline 
WA_MEPOHEADER_TECH_STR-MEMORYTYPE sy-vline 
WA_MEPOHEADER_TECH_STR-ID sy-vline      INTO ld_text SEPARATED BY SPACE.

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