ABAP Select data from SAP table MLDOC 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 MLDOC 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 MLDOC. 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 MLDOC 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_MLDOC TYPE STANDARD TABLE OF MLDOC,
      WA_MLDOC TYPE MLDOC,
      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: <MLDOC> TYPE MLDOC.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLDOC
*  INTO TABLE @DATA(IT_MLDOC2).
*--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_MLDOC INDEX 1 INTO DATA(WA_MLDOC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLDOC>-MANDT = 1.
<MLDOC>-DOCREF = 1.
<MLDOC>-CURTP = 1.
<MLDOC>-RLDNR = 1.
<MLDOC>-RUNREF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLDOC-ACC_PRINCIPLE, sy-vline,
  WA_MLDOC-KALNR, sy-vline,
  WA_MLDOC-JAHRPER, sy-vline,
  WA_MLDOC-JAHRPER_WIP, sy-vline,
  WA_MLDOC-CURRENT_PER, sy-vline,
  WA_MLDOC-XABR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLDOC 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_MLDOC 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_MLDOC INTO WA_MLDOC.


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

*Conversion exit PERI7, internal->external for field JAHRPER
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_MLDOC-JAHRPER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLDOC-JAHRPER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI7, internal->external for field JAHRPER_WIP
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_MLDOC-JAHRPER_WIP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLDOC-JAHRPER_WIP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI7, internal->external for field CURRENT_PER
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_MLDOC-CURRENT_PER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLDOC-CURRENT_PER.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit GJAHR, internal->external for field KJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MLDOC-KJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLDOC-KJAHR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit CUNIT, internal->external for field BSTME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MLDOC-BSTME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLDOC-BSTME.
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_MLDOC_STR, 
MANDT TYPE STRING,
DOCREF TYPE STRING,
CURTP TYPE STRING,
RLDNR TYPE STRING,
RUNREF TYPE STRING,
ACC_PRINCIPLE TYPE STRING,
KALNR TYPE STRING,
JAHRPER TYPE STRING,
JAHRPER_WIP TYPE STRING,
CURRENT_PER TYPE STRING,
XABR TYPE STRING,
GLVOR TYPE STRING,
VGART TYPE STRING,
POSART TYPE STRING,
CATEG TYPE STRING,
PTYP TYPE STRING,
BEWARTGRP TYPE STRING,
BVALT TYPE STRING,
PROCESS TYPE STRING,
PKALNR TYPE STRING,
QUANT TYPE STRING,
MEINS TYPE STRING,
STVAL TYPE STRING,
PRD TYPE STRING,
KDM TYPE STRING,
TPPRD TYPE STRING,
ALTVAL TYPE STRING,
WAERS TYPE STRING,
LBKUM TYPE STRING,
SALK3 TYPE STRING,
SALKV TYPE STRING,
STPRS TYPE STRING,
PVPRS TYPE STRING,
PEINH TYPE STRING,
XEKREL TYPE STRING,
XPLREL TYPE STRING,
PLQTY TYPE STRING,
MARKUP TYPE STRING,
XTPREL TYPE STRING,
VKWRT TYPE STRING,
VKSAL TYPE STRING,
EQNUM TYPE STRING,
TIMESTAMP TYPE STRING,
BUDAT TYPE STRING,
CYCLENR TYPE STRING,
AUFNR TYPE STRING,
AUFPS TYPE STRING,
BELNR TYPE STRING,
KJAHR TYPE STRING,
POSNR TYPE STRING,
AWTYP TYPE STRING,
AWSYS TYPE STRING,
AWORG TYPE STRING,
AWREF TYPE STRING,
AWITEM TYPE STRING,
AWITGRP TYPE STRING,
USNAM TYPE STRING,
TCODE TYPE STRING,
MLVNR TYPE STRING,
VGABE TYPE STRING,
HRKFT TYPE STRING,
KSTAR TYPE STRING,
BWART TYPE STRING,
WERKS TYPE STRING,
STORNO TYPE STRING,
BSTMG TYPE STRING,
BSTME TYPE STRING,
AREWR TYPE STRING,
REEWR TYPE STRING,
XKDM_NACT TYPE STRING,
_DATAAGING TYPE STRING,
KONGR TYPE STRING,
MODGR TYPE STRING,
SDM_VERSION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLDOC_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_MLDOC_STR-MANDT sy-vline 
WA_MLDOC_STR-DOCREF sy-vline 
WA_MLDOC_STR-CURTP sy-vline 
WA_MLDOC_STR-RLDNR sy-vline 
WA_MLDOC_STR-RUNREF sy-vline 
WA_MLDOC_STR-ACC_PRINCIPLE sy-vline 
WA_MLDOC_STR-KALNR sy-vline 
WA_MLDOC_STR-JAHRPER sy-vline 
WA_MLDOC_STR-JAHRPER_WIP sy-vline 
WA_MLDOC_STR-CURRENT_PER sy-vline 
WA_MLDOC_STR-XABR sy-vline 
WA_MLDOC_STR-GLVOR sy-vline 
WA_MLDOC_STR-VGART sy-vline 
WA_MLDOC_STR-POSART sy-vline 
WA_MLDOC_STR-CATEG sy-vline 
WA_MLDOC_STR-PTYP sy-vline 
WA_MLDOC_STR-BEWARTGRP sy-vline 
WA_MLDOC_STR-BVALT sy-vline 
WA_MLDOC_STR-PROCESS sy-vline 
WA_MLDOC_STR-PKALNR sy-vline 
WA_MLDOC_STR-QUANT sy-vline 
WA_MLDOC_STR-MEINS sy-vline 
WA_MLDOC_STR-STVAL sy-vline 
WA_MLDOC_STR-PRD sy-vline 
WA_MLDOC_STR-KDM sy-vline 
WA_MLDOC_STR-TPPRD sy-vline 
WA_MLDOC_STR-ALTVAL sy-vline 
WA_MLDOC_STR-WAERS sy-vline 
WA_MLDOC_STR-LBKUM sy-vline 
WA_MLDOC_STR-SALK3 sy-vline 
WA_MLDOC_STR-SALKV sy-vline 
WA_MLDOC_STR-STPRS sy-vline 
WA_MLDOC_STR-PVPRS sy-vline 
WA_MLDOC_STR-PEINH sy-vline 
WA_MLDOC_STR-XEKREL sy-vline 
WA_MLDOC_STR-XPLREL sy-vline 
WA_MLDOC_STR-PLQTY sy-vline 
WA_MLDOC_STR-MARKUP sy-vline 
WA_MLDOC_STR-XTPREL sy-vline 
WA_MLDOC_STR-VKWRT sy-vline 
WA_MLDOC_STR-VKSAL sy-vline 
WA_MLDOC_STR-EQNUM sy-vline 
WA_MLDOC_STR-TIMESTAMP sy-vline 
WA_MLDOC_STR-BUDAT sy-vline 
WA_MLDOC_STR-CYCLENR sy-vline 
WA_MLDOC_STR-AUFNR sy-vline 
WA_MLDOC_STR-AUFPS sy-vline 
WA_MLDOC_STR-BELNR sy-vline 
WA_MLDOC_STR-KJAHR sy-vline 
WA_MLDOC_STR-POSNR sy-vline 
WA_MLDOC_STR-AWTYP sy-vline 
WA_MLDOC_STR-AWSYS sy-vline 
WA_MLDOC_STR-AWORG sy-vline 
WA_MLDOC_STR-AWREF sy-vline 
WA_MLDOC_STR-AWITEM sy-vline 
WA_MLDOC_STR-AWITGRP sy-vline 
WA_MLDOC_STR-USNAM sy-vline 
WA_MLDOC_STR-TCODE sy-vline 
WA_MLDOC_STR-MLVNR sy-vline 
WA_MLDOC_STR-VGABE sy-vline 
WA_MLDOC_STR-HRKFT sy-vline 
WA_MLDOC_STR-KSTAR sy-vline 
WA_MLDOC_STR-BWART sy-vline 
WA_MLDOC_STR-WERKS sy-vline 
WA_MLDOC_STR-STORNO sy-vline 
WA_MLDOC_STR-BSTMG sy-vline 
WA_MLDOC_STR-BSTME sy-vline 
WA_MLDOC_STR-AREWR sy-vline 
WA_MLDOC_STR-REEWR sy-vline 
WA_MLDOC_STR-XKDM_NACT sy-vline 
WA_MLDOC_STR-_DATAAGING sy-vline 
WA_MLDOC_STR-KONGR sy-vline 
WA_MLDOC_STR-MODGR sy-vline 
WA_MLDOC_STR-SDM_VERSION sy-vline      INTO ld_text SEPARATED BY SPACE.

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