ABAP Select data from SAP table MYSTA 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 MYSTA 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 MYSTA. 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 MYSTA 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_MYSTA TYPE STANDARD TABLE OF MYSTA,
      WA_MYSTA TYPE MYSTA,
      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: <MYSTA> TYPE MYSTA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MYSTA
*  INTO TABLE @DATA(IT_MYSTA2).
*--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_MYSTA INDEX 1 INTO DATA(WA_MYSTA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MYSTA>-MANDT = 1.
<MYSTA>-PRGID = 1.
<MYSTA>-TIMEL = 1.
<MYSTA>-REPID = 1.
<MYSTA>-SLSET = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MYSTA-BEGTL, sy-vline,
  WA_MYSTA-ENDTL, sy-vline,
  WA_MYSTA-SELCT, sy-vline,
  WA_MYSTA-DTBCT, sy-vline,
  WA_MYSTA-COMCT, sy-vline,
  WA_MYSTA-UPDCT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MYSTA 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_MYSTA 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_MYSTA INTO WA_MYSTA.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MYSTA_STR, 
MANDT TYPE STRING,
PRGID TYPE STRING,
TIMEL TYPE STRING,
REPID TYPE STRING,
SLSET TYPE STRING,
BEGTL TYPE STRING,
ENDTL TYPE STRING,
SELCT TYPE STRING,
DTBCT TYPE STRING,
COMCT TYPE STRING,
UPDCT TYPE STRING,
INSCT TYPE STRING,
DELCT TYPE STRING,
BTCCT TYPE STRING,
BTC22 TYPE STRING,
BTSCT TYPE STRING,
PRCCT TYPE STRING,
PRC22 TYPE STRING,
MLUCT TYPE STRING,
MBWCT TYPE STRING,
ERRCT TYPE STRING,
VAUCT TYPE STRING,
VARCT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MYSTA_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_MYSTA_STR-MANDT sy-vline 
WA_MYSTA_STR-PRGID sy-vline 
WA_MYSTA_STR-TIMEL sy-vline 
WA_MYSTA_STR-REPID sy-vline 
WA_MYSTA_STR-SLSET sy-vline 
WA_MYSTA_STR-BEGTL sy-vline 
WA_MYSTA_STR-ENDTL sy-vline 
WA_MYSTA_STR-SELCT sy-vline 
WA_MYSTA_STR-DTBCT sy-vline 
WA_MYSTA_STR-COMCT sy-vline 
WA_MYSTA_STR-UPDCT sy-vline 
WA_MYSTA_STR-INSCT sy-vline 
WA_MYSTA_STR-DELCT sy-vline 
WA_MYSTA_STR-BTCCT sy-vline 
WA_MYSTA_STR-BTC22 sy-vline 
WA_MYSTA_STR-BTSCT sy-vline 
WA_MYSTA_STR-PRCCT sy-vline 
WA_MYSTA_STR-PRC22 sy-vline 
WA_MYSTA_STR-MLUCT sy-vline 
WA_MYSTA_STR-MBWCT sy-vline 
WA_MYSTA_STR-ERRCT sy-vline 
WA_MYSTA_STR-VAUCT sy-vline 
WA_MYSTA_STR-VARCT sy-vline      INTO ld_text SEPARATED BY SPACE.

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