ABAP Select data from SAP table AMESISTA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AMESISTA
*  INTO TABLE @DATA(IT_AMESISTA2).
*--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_AMESISTA INDEX 1 INTO DATA(WA_AMESISTA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AMESISTA>-PROCGUID = 1.
<AMESISTA>-DESTIN = 1.
<AMESISTA>-INSTANCE = 1.
<AMESISTA>-LFNUM = 1.
<AMESISTA>-ROWINDEX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AMESISTA-TCODE, sy-vline,
  WA_AMESISTA-CONNECTION_NAME, sy-vline,
  WA_AMESISTA-STARTDATE, sy-vline,
  WA_AMESISTA-STARTTIME, sy-vline,
  WA_AMESISTA-ENDDATE, sy-vline,
  WA_AMESISTA-ENDTIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AMESISTA 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_AMESISTA 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_AMESISTA INTO WA_AMESISTA.


*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_AMESISTA_STR, 
PROCGUID TYPE STRING,
DESTIN TYPE STRING,
INSTANCE TYPE STRING,
LFNUM TYPE STRING,
ROWINDEX TYPE STRING,
TCODE TYPE STRING,
CONNECTION_NAME TYPE STRING,
STARTDATE TYPE STRING,
STARTTIME TYPE STRING,
ENDDATE TYPE STRING,
ENDTIME TYPE STRING,
CALL_COUNT TYPE STRING,
CALL_TIME TYPE STRING,
REPORT TYPE STRING,
TASKTYPE TYPE STRING,
DYNPRONR TYPE STRING,
WPROCTIME TYPE STRING,
KBYTETRANS TYPE STRING,
RESPTIME TYPE STRING,
WAITTIME TYPE STRING,
CPUTIME TYPE STRING,
LDGENTIME TYPE STRING,
MEMORYUSED TYPE STRING,
DBTIME TYPE STRING,
DBCHANGES TYPE STRING,
ROUNDTRIPS TYPE STRING,
INDATA TYPE STRING,
OUTDATA TYPE STRING,
RECPROCNUM_ST TYPE STRING,
TOTALEX_ST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AMESISTA_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_AMESISTA_STR-PROCGUID sy-vline 
WA_AMESISTA_STR-DESTIN sy-vline 
WA_AMESISTA_STR-INSTANCE sy-vline 
WA_AMESISTA_STR-LFNUM sy-vline 
WA_AMESISTA_STR-ROWINDEX sy-vline 
WA_AMESISTA_STR-TCODE sy-vline 
WA_AMESISTA_STR-CONNECTION_NAME sy-vline 
WA_AMESISTA_STR-STARTDATE sy-vline 
WA_AMESISTA_STR-STARTTIME sy-vline 
WA_AMESISTA_STR-ENDDATE sy-vline 
WA_AMESISTA_STR-ENDTIME sy-vline 
WA_AMESISTA_STR-CALL_COUNT sy-vline 
WA_AMESISTA_STR-CALL_TIME sy-vline 
WA_AMESISTA_STR-REPORT sy-vline 
WA_AMESISTA_STR-TASKTYPE sy-vline 
WA_AMESISTA_STR-DYNPRONR sy-vline 
WA_AMESISTA_STR-WPROCTIME sy-vline 
WA_AMESISTA_STR-KBYTETRANS sy-vline 
WA_AMESISTA_STR-RESPTIME sy-vline 
WA_AMESISTA_STR-WAITTIME sy-vline 
WA_AMESISTA_STR-CPUTIME sy-vline 
WA_AMESISTA_STR-LDGENTIME sy-vline 
WA_AMESISTA_STR-MEMORYUSED sy-vline 
WA_AMESISTA_STR-DBTIME sy-vline 
WA_AMESISTA_STR-DBCHANGES sy-vline 
WA_AMESISTA_STR-ROUNDTRIPS sy-vline 
WA_AMESISTA_STR-INDATA sy-vline 
WA_AMESISTA_STR-OUTDATA sy-vline 
WA_AMESISTA_STR-RECPROCNUM_ST sy-vline 
WA_AMESISTA_STR-TOTALEX_ST sy-vline      INTO ld_text SEPARATED BY SPACE.

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