ABAP Select data from SAP table MC18I31HDR into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP MC18I31HDR 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 MC18I31HDR. 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 MC18I31HDR 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_MC18I31HDR TYPE STANDARD TABLE OF MC18I31HDR,
      WA_MC18I31HDR TYPE MC18I31HDR,
      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: <MC18I31HDR> TYPE MC18I31HDR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MC18I31HDR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MC18I31HDR
  INTO TABLE IT_MC18I31HDR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MC18I31HDR
*  INTO TABLE @DATA(IT_MC18I31HDR2).
*--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_MC18I31HDR INDEX 1 INTO DATA(WA_MC18I31HDR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MC18I31HDR ASSIGNING <MC18I31HDR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MC18I31HDR>-AUART = 1.
<MC18I31HDR>-AUFNR = 1.
<MC18I31HDR>-BAUTL_HD = 1.
<MC18I31HDR>-DLZBRUTTO = 1.
<MC18I31HDR>-DLZNETTO = 1.

ENDLOOP.

LOOP AT IT_MC18I31HDR INTO WA_MC18I31HDR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MC18I31HDR-EHTAG, sy-vline,
  WA_MC18I31HDR-EQUNR, sy-vline,
  WA_MC18I31HDR-ERDAT, sy-vline,
  WA_MC18I31HDR-ILART, sy-vline,
  WA_MC18I31HDR-INGRP, sy-vline,
  WA_MC18I31HDR-IWERK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MC18I31HDR 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_MC18I31HDR 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_MC18I31HDR INTO WA_MC18I31HDR.


*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 AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC18I31HDR-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I31HDR-AUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field BAUTL_HD
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MC18I31HDR-BAUTL_HD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I31HDR-BAUTL_HD.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field EHTAG
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MC18I31HDR-EHTAG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I31HDR-EHTAG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC18I31HDR-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I31HDR-EQUNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KUNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MC18I31HDR-KUNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I31HDR-KUNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_MC18I31HDR-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MC18I31HDR-TPLNR.
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_MC18I31HDR_STR, 
AUART TYPE STRING,
AUFNR TYPE STRING,
BAUTL_HD TYPE STRING,
DLZBRUTTO TYPE STRING,
DLZNETTO TYPE STRING,
EHTAG TYPE STRING,
EQUNR TYPE STRING,
ERDAT TYPE STRING,
ILART TYPE STRING,
INGRP TYPE STRING,
IWERK TYPE STRING,
KUNUM TYPE STRING,
SPART TYPE STRING,
TPLNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
ZHLAFIH TYPE STRING,
ZHLAFIH_ABGS TYPE STRING,
ZHLAFIH_GEPL TYPE STRING,
ZHLAFIH_NDGEF TYPE STRING,
ZHLAFIH_OFFEN TYPE STRING,
ZHLAFIH_SOF TYPE STRING,
ZHLAFIH_TGERL TYPE STRING,
ZHLAFIH_UNGPL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MC18I31HDR_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_MC18I31HDR_STR-AUART sy-vline 
WA_MC18I31HDR_STR-AUFNR sy-vline 
WA_MC18I31HDR_STR-BAUTL_HD sy-vline 
WA_MC18I31HDR_STR-DLZBRUTTO sy-vline 
WA_MC18I31HDR_STR-DLZNETTO sy-vline 
WA_MC18I31HDR_STR-EHTAG sy-vline 
WA_MC18I31HDR_STR-EQUNR sy-vline 
WA_MC18I31HDR_STR-ERDAT sy-vline 
WA_MC18I31HDR_STR-ILART sy-vline 
WA_MC18I31HDR_STR-INGRP sy-vline 
WA_MC18I31HDR_STR-IWERK sy-vline 
WA_MC18I31HDR_STR-KUNUM sy-vline 
WA_MC18I31HDR_STR-SPART sy-vline 
WA_MC18I31HDR_STR-TPLNR sy-vline 
WA_MC18I31HDR_STR-VKORG sy-vline 
WA_MC18I31HDR_STR-VTWEG sy-vline 
WA_MC18I31HDR_STR-ZHLAFIH sy-vline 
WA_MC18I31HDR_STR-ZHLAFIH_ABGS sy-vline 
WA_MC18I31HDR_STR-ZHLAFIH_GEPL sy-vline 
WA_MC18I31HDR_STR-ZHLAFIH_NDGEF sy-vline 
WA_MC18I31HDR_STR-ZHLAFIH_OFFEN sy-vline 
WA_MC18I31HDR_STR-ZHLAFIH_SOF sy-vline 
WA_MC18I31HDR_STR-ZHLAFIH_TGERL sy-vline 
WA_MC18I31HDR_STR-ZHLAFIH_UNGPL sy-vline      INTO ld_text SEPARATED BY SPACE.

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