ABAP Select data from SAP table ALRFCALSTA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALRFCALSTA
*  INTO TABLE @DATA(IT_ALRFCALSTA2).
*--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_ALRFCALSTA INDEX 1 INTO DATA(WA_ALRFCALSTA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ALRFCALSTA>-RFCDEST = 1.
<ALRFCALSTA>-ALSYSID = 1.
<ALRFCALSTA>-MSEGNAME = 1.
<ALRFCALSTA>-ALUNIQNUM = 1.
<ALRFCALSTA>-ALINDEX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALRFCALSTA-ALERTDATE, sy-vline,
  WA_ALRFCALSTA-ALERTTIME, sy-vline,
  WA_ALRFCALSTA-DUMMYALIGN, sy-vline,
  WA_ALRFCALSTA-STATUS, sy-vline,
  WA_ALRFCALSTA-ALUSER, sy-vline,
  WA_ALRFCALSTA-SYSID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALRFCALSTA 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_ALRFCALSTA 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_ALRFCALSTA INTO WA_ALRFCALSTA.


*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_ALRFCALSTA_STR, 
RFCDEST TYPE STRING,
ALSYSID TYPE STRING,
MSEGNAME TYPE STRING,
ALUNIQNUM TYPE STRING,
ALINDEX TYPE STRING,
ALERTDATE TYPE STRING,
ALERTTIME TYPE STRING,
DUMMYALIGN TYPE STRING,
STATUS TYPE STRING,
ALUSER TYPE STRING,
SYSID TYPE STRING,
CONTEXT TYPE STRING,
CONTXTSTAT TYPE STRING,
CTXCLASS TYPE STRING,
CTXOWNER TYPE STRING,
SEGMENT TYPE STRING,
SEGMENTTYP TYPE STRING,
DESTINAT TYPE STRING,
SEGMSTATUS TYPE STRING,
RESP_MSSY TYPE STRING,
VERSION TYPE STRING,
CHG_USER TYPE STRING,
CHG_DATE TYPE STRING,
CHG_TIME TYPE STRING,
SEGSTATMST TYPE STRING,
SEGSTATCNT TYPE STRING,
SEGMSERVER TYPE STRING,
SEGMHOST TYPE STRING,
CONTXTTYPE TYPE STRING,
CTX_SYSID TYPE STRING,
CTX_MCNAME TYPE STRING,
CTX_NUMRNG TYPE STRING,
CTX_UID TYPE STRING,
CTX_CLAS TYPE STRING,
CTX_INDEX TYPE STRING,
CTX_EXTIDX TYPE STRING,
RESERVE_C TYPE STRING,
RESERVE_I TYPE STRING,
CTXCLIENT TYPE STRING,
CSMSYSID TYPE STRING,
DESTINAT_2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALRFCALSTA_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_ALRFCALSTA_STR-RFCDEST sy-vline 
WA_ALRFCALSTA_STR-ALSYSID sy-vline 
WA_ALRFCALSTA_STR-MSEGNAME sy-vline 
WA_ALRFCALSTA_STR-ALUNIQNUM sy-vline 
WA_ALRFCALSTA_STR-ALINDEX sy-vline 
WA_ALRFCALSTA_STR-ALERTDATE sy-vline 
WA_ALRFCALSTA_STR-ALERTTIME sy-vline 
WA_ALRFCALSTA_STR-DUMMYALIGN sy-vline 
WA_ALRFCALSTA_STR-STATUS sy-vline 
WA_ALRFCALSTA_STR-ALUSER sy-vline 
WA_ALRFCALSTA_STR-SYSID sy-vline 
WA_ALRFCALSTA_STR-CONTEXT sy-vline 
WA_ALRFCALSTA_STR-CONTXTSTAT sy-vline 
WA_ALRFCALSTA_STR-CTXCLASS sy-vline 
WA_ALRFCALSTA_STR-CTXOWNER sy-vline 
WA_ALRFCALSTA_STR-SEGMENT sy-vline 
WA_ALRFCALSTA_STR-SEGMENTTYP sy-vline 
WA_ALRFCALSTA_STR-DESTINAT sy-vline 
WA_ALRFCALSTA_STR-SEGMSTATUS sy-vline 
WA_ALRFCALSTA_STR-RESP_MSSY sy-vline 
WA_ALRFCALSTA_STR-VERSION sy-vline 
WA_ALRFCALSTA_STR-CHG_USER sy-vline 
WA_ALRFCALSTA_STR-CHG_DATE sy-vline 
WA_ALRFCALSTA_STR-CHG_TIME sy-vline 
WA_ALRFCALSTA_STR-SEGSTATMST sy-vline 
WA_ALRFCALSTA_STR-SEGSTATCNT sy-vline 
WA_ALRFCALSTA_STR-SEGMSERVER sy-vline 
WA_ALRFCALSTA_STR-SEGMHOST sy-vline 
WA_ALRFCALSTA_STR-CONTXTTYPE sy-vline 
WA_ALRFCALSTA_STR-CTX_SYSID sy-vline 
WA_ALRFCALSTA_STR-CTX_MCNAME sy-vline 
WA_ALRFCALSTA_STR-CTX_NUMRNG sy-vline 
WA_ALRFCALSTA_STR-CTX_UID sy-vline 
WA_ALRFCALSTA_STR-CTX_CLAS sy-vline 
WA_ALRFCALSTA_STR-CTX_INDEX sy-vline 
WA_ALRFCALSTA_STR-CTX_EXTIDX sy-vline 
WA_ALRFCALSTA_STR-RESERVE_C sy-vline 
WA_ALRFCALSTA_STR-RESERVE_I sy-vline 
WA_ALRFCALSTA_STR-CTXCLIENT sy-vline 
WA_ALRFCALSTA_STR-CSMSYSID sy-vline 
WA_ALRFCALSTA_STR-DESTINAT_2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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