ABAP Select data from SAP table MMRP_REQS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMRP_REQS
*  INTO TABLE @DATA(IT_MMRP_REQS2).
*--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_MMRP_REQS INDEX 1 INTO DATA(WA_MMRP_REQS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMRP_REQS>-AUFNR = 1.
<MMRP_REQS>-RSNUM = 1.
<MMRP_REQS>-RSPOS = 1.
<MMRP_REQS>-METHODE = 1.
<MMRP_REQS>-APLZL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMRP_REQS-MATNR, sy-vline,
  WA_MMRP_REQS-BDMNG, sy-vline,
  WA_MMRP_REQS-VMENG, sy-vline,
  WA_MMRP_REQS-ENMNG, sy-vline,
  WA_MMRP_REQS-MEINS, sy-vline,
  WA_MMRP_REQS-BDTER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMRP_REQS 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_MMRP_REQS 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_MMRP_REQS INTO WA_MMRP_REQS.


*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_MMRP_REQS-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMRP_REQS-AUFNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_MMRP_REQS-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMRP_REQS-PSPEL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MMRP_REQS-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMRP_REQS-STLNR.
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_MMRP_REQS_STR, 
AUFNR TYPE STRING,
RSNUM TYPE STRING,
RSPOS TYPE STRING,
METHODE TYPE STRING,
APLZL TYPE STRING,
MATNR TYPE STRING,
BDMNG TYPE STRING,
VMENG TYPE STRING,
ENMNG TYPE STRING,
MEINS TYPE STRING,
BDTER TYPE STRING,
SBTER TYPE STRING,
CHARG TYPE STRING,
LGORT TYPE STRING,
WERKS TYPE STRING,
SOBKZ TYPE STRING,
VRPLA TYPE STRING,
ATPCAT TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
PSPEL TYPE STRING,
STLTY TYPE STRING,
STLNR TYPE STRING,
STLKN TYPE STRING,
STPOZ TYPE STRING,
STVKN TYPE STRING,
LOGCOMP TYPE STRING,
CUOBJ TYPE STRING,
PARENTPOS TYPE STRING,
IGNOREPEG TYPE STRING,
CUOBJ_TYPE TYPE STRING,
CUOBJ_ID TYPE STRING,
PALTR TYPE STRING,
BDART TYPE STRING,
BDZTP TYPE STRING,
PRVBE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMRP_REQS_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_MMRP_REQS_STR-AUFNR sy-vline 
WA_MMRP_REQS_STR-RSNUM sy-vline 
WA_MMRP_REQS_STR-RSPOS sy-vline 
WA_MMRP_REQS_STR-METHODE sy-vline 
WA_MMRP_REQS_STR-APLZL sy-vline 
WA_MMRP_REQS_STR-MATNR sy-vline 
WA_MMRP_REQS_STR-BDMNG sy-vline 
WA_MMRP_REQS_STR-VMENG sy-vline 
WA_MMRP_REQS_STR-ENMNG sy-vline 
WA_MMRP_REQS_STR-MEINS sy-vline 
WA_MMRP_REQS_STR-BDTER sy-vline 
WA_MMRP_REQS_STR-SBTER sy-vline 
WA_MMRP_REQS_STR-CHARG sy-vline 
WA_MMRP_REQS_STR-LGORT sy-vline 
WA_MMRP_REQS_STR-WERKS sy-vline 
WA_MMRP_REQS_STR-SOBKZ sy-vline 
WA_MMRP_REQS_STR-VRPLA sy-vline 
WA_MMRP_REQS_STR-ATPCAT sy-vline 
WA_MMRP_REQS_STR-KDAUF sy-vline 
WA_MMRP_REQS_STR-KDPOS sy-vline 
WA_MMRP_REQS_STR-PSPEL sy-vline 
WA_MMRP_REQS_STR-STLTY sy-vline 
WA_MMRP_REQS_STR-STLNR sy-vline 
WA_MMRP_REQS_STR-STLKN sy-vline 
WA_MMRP_REQS_STR-STPOZ sy-vline 
WA_MMRP_REQS_STR-STVKN sy-vline 
WA_MMRP_REQS_STR-LOGCOMP sy-vline 
WA_MMRP_REQS_STR-CUOBJ sy-vline 
WA_MMRP_REQS_STR-PARENTPOS sy-vline 
WA_MMRP_REQS_STR-IGNOREPEG sy-vline 
WA_MMRP_REQS_STR-CUOBJ_TYPE sy-vline 
WA_MMRP_REQS_STR-CUOBJ_ID sy-vline 
WA_MMRP_REQS_STR-PALTR sy-vline 
WA_MMRP_REQS_STR-BDART sy-vline 
WA_MMRP_REQS_STR-BDZTP sy-vline 
WA_MMRP_REQS_STR-PRVBE sy-vline      INTO ld_text SEPARATED BY SPACE.

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