ABAP Select data from SAP table AMSTANO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AMSTANO
*  INTO TABLE @DATA(IT_AMSTANO2).
*--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_AMSTANO INDEX 1 INTO DATA(WA_AMSTANO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AMSTANO>-PROCGUID = 1.
<AMSTANO>-COMPONENT = 1.
<AMSTANO>-COMPTYPE = 1.
<AMSTANO>-LFNUM = 1.
<AMSTANO>-TEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AMSTANO-LONGTEXT, sy-vline,
  WA_AMSTANO-STEPCNT, sy-vline,
  WA_AMSTANO-LUWCNT, sy-vline,
  WA_AMSTANO-RESPTI, sy-vline,
  WA_AMSTANO-RESPTIMT, sy-vline,
  WA_AMSTANO-RESPTIMTA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AMSTANO 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_AMSTANO 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_AMSTANO INTO WA_AMSTANO.


*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_AMSTANO_STR, 
PROCGUID TYPE STRING,
COMPONENT TYPE STRING,
COMPTYPE TYPE STRING,
LFNUM TYPE STRING,
TEXT TYPE STRING,
LONGTEXT TYPE STRING,
STEPCNT TYPE STRING,
LUWCNT TYPE STRING,
RESPTI TYPE STRING,
RESPTIMT TYPE STRING,
RESPTIMTA TYPE STRING,
CPUTI TYPE STRING,
CPUTIMT TYPE STRING,
CPUTIMTA TYPE STRING,
QUEUETI TYPE STRING,
QUEUETIMT TYPE STRING,
QUEUETIMTA TYPE STRING,
WAITTI TYPE STRING,
WAITTIMT TYPE STRING,
WAITTIMTA TYPE STRING,
LOADTI TYPE STRING,
LOADTIMT TYPE STRING,
LOADTIMTA TYPE STRING,
GENTI TYPE STRING,
GENTIMT TYPE STRING,
GENTIMTA TYPE STRING,
NETTI TYPE STRING,
NETTIMT TYPE STRING,
NETTIMTA TYPE STRING,
MAXMEM TYPE STRING,
SERVICE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AMSTANO_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_AMSTANO_STR-PROCGUID sy-vline 
WA_AMSTANO_STR-COMPONENT sy-vline 
WA_AMSTANO_STR-COMPTYPE sy-vline 
WA_AMSTANO_STR-LFNUM sy-vline 
WA_AMSTANO_STR-TEXT sy-vline 
WA_AMSTANO_STR-LONGTEXT sy-vline 
WA_AMSTANO_STR-STEPCNT sy-vline 
WA_AMSTANO_STR-LUWCNT sy-vline 
WA_AMSTANO_STR-RESPTI sy-vline 
WA_AMSTANO_STR-RESPTIMT sy-vline 
WA_AMSTANO_STR-RESPTIMTA sy-vline 
WA_AMSTANO_STR-CPUTI sy-vline 
WA_AMSTANO_STR-CPUTIMT sy-vline 
WA_AMSTANO_STR-CPUTIMTA sy-vline 
WA_AMSTANO_STR-QUEUETI sy-vline 
WA_AMSTANO_STR-QUEUETIMT sy-vline 
WA_AMSTANO_STR-QUEUETIMTA sy-vline 
WA_AMSTANO_STR-WAITTI sy-vline 
WA_AMSTANO_STR-WAITTIMT sy-vline 
WA_AMSTANO_STR-WAITTIMTA sy-vline 
WA_AMSTANO_STR-LOADTI sy-vline 
WA_AMSTANO_STR-LOADTIMT sy-vline 
WA_AMSTANO_STR-LOADTIMTA sy-vline 
WA_AMSTANO_STR-GENTI sy-vline 
WA_AMSTANO_STR-GENTIMT sy-vline 
WA_AMSTANO_STR-GENTIMTA sy-vline 
WA_AMSTANO_STR-NETTI sy-vline 
WA_AMSTANO_STR-NETTIMT sy-vline 
WA_AMSTANO_STR-NETTIMTA sy-vline 
WA_AMSTANO_STR-MAXMEM sy-vline 
WA_AMSTANO_STR-SERVICE sy-vline      INTO ld_text SEPARATED BY SPACE.

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