ABAP Select data from SAP table CACS_OAPSI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CACS_OAPSI
*  INTO TABLE @DATA(IT_CACS_OAPSI2).
*--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_CACS_OAPSI INDEX 1 INTO DATA(WA_CACS_OAPSI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CACS_OAPSI>-MANDT = 1.
<CACS_OAPSI>-OAPIID = 1.
<CACS_OAPSI>-OAPSIID = 1.
<CACS_OAPSI>-OAWLID = 1.
<CACS_OAPSI>-PCNTRLMETH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CACS_OAPSI-OAPSDID, sy-vline,
  WA_CACS_OAPSI-SDLSTRTTM, sy-vline,
  WA_CACS_OAPSI-SDLSTRTDT, sy-vline,
  WA_CACS_OAPSI-STRTIMMED, sy-vline,
  WA_CACS_OAPSI-JOBNAME, sy-vline,
  WA_CACS_OAPSI-ERRAGENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CACS_OAPSI 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_CACS_OAPSI 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_CACS_OAPSI INTO WA_CACS_OAPSI.


*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 ALPHA, internal->external for field OAPIID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CACS_OAPSI-OAPIID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CACS_OAPSI-OAPIID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OAWLID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CACS_OAPSI-OAWLID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CACS_OAPSI-OAWLID.
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_CACS_OAPSI_STR, 
MANDT TYPE STRING,
OAPIID TYPE STRING,
OAPSIID TYPE STRING,
OAWLID TYPE STRING,
PCNTRLMETH TYPE STRING,
OAPSDID TYPE STRING,
SDLSTRTTM TYPE STRING,
SDLSTRTDT TYPE STRING,
STRTIMMED TYPE STRING,
JOBNAME TYPE STRING,
ERRAGENT TYPE STRING,
DLGAGENT TYPE STRING,
RELREQ TYPE STRING,
ACTRELLVL TYPE STRING,
EXPRELLVL TYPE STRING,
REL1AGENT TYPE STRING,
REL2AGENT TYPE STRING,
LTLOCK TYPE STRING,
OALOG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CACS_OAPSI_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_CACS_OAPSI_STR-MANDT sy-vline 
WA_CACS_OAPSI_STR-OAPIID sy-vline 
WA_CACS_OAPSI_STR-OAPSIID sy-vline 
WA_CACS_OAPSI_STR-OAWLID sy-vline 
WA_CACS_OAPSI_STR-PCNTRLMETH sy-vline 
WA_CACS_OAPSI_STR-OAPSDID sy-vline 
WA_CACS_OAPSI_STR-SDLSTRTTM sy-vline 
WA_CACS_OAPSI_STR-SDLSTRTDT sy-vline 
WA_CACS_OAPSI_STR-STRTIMMED sy-vline 
WA_CACS_OAPSI_STR-JOBNAME sy-vline 
WA_CACS_OAPSI_STR-ERRAGENT sy-vline 
WA_CACS_OAPSI_STR-DLGAGENT sy-vline 
WA_CACS_OAPSI_STR-RELREQ sy-vline 
WA_CACS_OAPSI_STR-ACTRELLVL sy-vline 
WA_CACS_OAPSI_STR-EXPRELLVL sy-vline 
WA_CACS_OAPSI_STR-REL1AGENT sy-vline 
WA_CACS_OAPSI_STR-REL2AGENT sy-vline 
WA_CACS_OAPSI_STR-LTLOCK sy-vline 
WA_CACS_OAPSI_STR-OALOG sy-vline      INTO ld_text SEPARATED BY SPACE.

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