ABAP Select data from SAP table /SAPAPO/MUSTER into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SAPAPO/MUSTER 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 /SAPAPO/MUSTER. 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 /SAPAPO/MUSTER 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_/SAPAPO/MUSTER TYPE STANDARD TABLE OF /SAPAPO/MUSTER,
      WA_/SAPAPO/MUSTER TYPE /SAPAPO/MUSTER,
      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: </SAPAPO/MUSTER> TYPE /SAPAPO/MUSTER.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SAPAPO/MUSTER
  INTO TABLE IT_/SAPAPO/MUSTER.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SAPAPO/MUSTER
*  INTO TABLE @DATA(IT_/SAPAPO/MUSTER2).
*--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_/SAPAPO/MUSTER INDEX 1 INTO DATA(WA_/SAPAPO/MUSTER2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SAPAPO/MUSTER ASSIGNING </SAPAPO/MUSTER>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SAPAPO/MUSTER>-MANDT = 1.
</SAPAPO/MUSTER>-MATNR = 1.
</SAPAPO/MUSTER>-VRBMT = 1.
</SAPAPO/MUSTER>-VRBWK = 1.
</SAPAPO/MUSTER>-VRBFK = 1.

ENDLOOP.

LOOP AT IT_/SAPAPO/MUSTER INTO WA_/SAPAPO/MUSTER.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SAPAPO/MUSTER-VRBDT, sy-vline,
  WA_/SAPAPO/MUSTER-MCDYTYP, sy-vline,
  WA_/SAPAPO/MUSTER-PERIV, sy-vline,
  WA_/SAPAPO/MUSTER-PERKZ, sy-vline,
  WA_/SAPAPO/MUSTER-FNAME, sy-vline,
  WA_/SAPAPO/MUSTER-BDTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SAPAPO/MUSTER 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_/SAPAPO/MUSTER 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_/SAPAPO/MUSTER INTO WA_/SAPAPO/MUSTER.


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

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

*Conversion exit PERI7, internal->external for field PERIO
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_/SAPAPO/MUSTER-PERIO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/SAPAPO/MUSTER-PERIO.
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_/SAPAPO/MUSTER_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
VRBMT TYPE STRING,
VRBWK TYPE STRING,
VRBFK TYPE STRING,
VRBDT TYPE STRING,
MCDYTYP TYPE STRING,
PERIV TYPE STRING,
PERKZ TYPE STRING,
FNAME TYPE STRING,
BDTYP TYPE STRING,
PERIO TYPE STRING,
ANZBP TYPE STRING,
SPMON TYPE STRING,
SPBUP TYPE STRING,
PRASTA TYPE STRING,
DATBIS TYPE STRING,
SAFNR TYPE STRING,
ATINN TYPE STRING,
ATWRT TYPE STRING,
KLART TYPE STRING,
AKTION TYPE STRING,
KTEXT TYPE STRING,
ERKRS TYPE STRING,
WKSOP TYPE STRING,
COPAM TYPE STRING,
POPER TYPE STRING,
BDATJ TYPE STRING,
DISPO TYPE STRING,
MAKTX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SAPAPO/MUSTER_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_/SAPAPO/MUSTER_STR-MANDT sy-vline 
WA_/SAPAPO/MUSTER_STR-MATNR sy-vline 
WA_/SAPAPO/MUSTER_STR-VRBMT sy-vline 
WA_/SAPAPO/MUSTER_STR-VRBWK sy-vline 
WA_/SAPAPO/MUSTER_STR-VRBFK sy-vline 
WA_/SAPAPO/MUSTER_STR-VRBDT sy-vline 
WA_/SAPAPO/MUSTER_STR-MCDYTYP sy-vline 
WA_/SAPAPO/MUSTER_STR-PERIV sy-vline 
WA_/SAPAPO/MUSTER_STR-PERKZ sy-vline 
WA_/SAPAPO/MUSTER_STR-FNAME sy-vline 
WA_/SAPAPO/MUSTER_STR-BDTYP sy-vline 
WA_/SAPAPO/MUSTER_STR-PERIO sy-vline 
WA_/SAPAPO/MUSTER_STR-ANZBP sy-vline 
WA_/SAPAPO/MUSTER_STR-SPMON sy-vline 
WA_/SAPAPO/MUSTER_STR-SPBUP sy-vline 
WA_/SAPAPO/MUSTER_STR-PRASTA sy-vline 
WA_/SAPAPO/MUSTER_STR-DATBIS sy-vline 
WA_/SAPAPO/MUSTER_STR-SAFNR sy-vline 
WA_/SAPAPO/MUSTER_STR-ATINN sy-vline 
WA_/SAPAPO/MUSTER_STR-ATWRT sy-vline 
WA_/SAPAPO/MUSTER_STR-KLART sy-vline 
WA_/SAPAPO/MUSTER_STR-AKTION sy-vline 
WA_/SAPAPO/MUSTER_STR-KTEXT sy-vline 
WA_/SAPAPO/MUSTER_STR-ERKRS sy-vline 
WA_/SAPAPO/MUSTER_STR-WKSOP sy-vline 
WA_/SAPAPO/MUSTER_STR-COPAM sy-vline 
WA_/SAPAPO/MUSTER_STR-POPER sy-vline 
WA_/SAPAPO/MUSTER_STR-BDATJ sy-vline 
WA_/SAPAPO/MUSTER_STR-DISPO sy-vline 
WA_/SAPAPO/MUSTER_STR-MAKTX sy-vline      INTO ld_text SEPARATED BY SPACE.

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