ABAP Select data from SAP table IOOPER_PREDEC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IOOPER_PREDEC
*  INTO TABLE @DATA(IT_IOOPER_PREDEC2).
*--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_IOOPER_PREDEC INDEX 1 INTO DATA(WA_IOOPER_PREDEC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IOOPER_PREDEC>-PRE1_STTXT = 1.
<IOOPER_PREDEC>-PRE2_STTXT = 1.
<IOOPER_PREDEC>-PRE3_STTXT = 1.
<IOOPER_PREDEC>-PRE1_STATUS = 1.
<IOOPER_PREDEC>-PRE2_STATUS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IOOPER_PREDEC-PRE3_STATUS, sy-vline,
  WA_IOOPER_PREDEC-PRE1_QUANT, sy-vline,
  WA_IOOPER_PREDEC-PRE2_QUANT, sy-vline,
  WA_IOOPER_PREDEC-PRE3_QUANT, sy-vline,
  WA_IOOPER_PREDEC-PRE1_MGVRG, sy-vline,
  WA_IOOPER_PREDEC-PRE1_LMNGA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IOOPER_PREDEC 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_IOOPER_PREDEC 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_IOOPER_PREDEC INTO WA_IOOPER_PREDEC.


*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 CUNIT, internal->external for field PRE1_MEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IOOPER_PREDEC-PRE1_MEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IOOPER_PREDEC-PRE1_MEINH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field PRE2_MEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IOOPER_PREDEC-PRE2_MEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IOOPER_PREDEC-PRE2_MEINH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field PRE3_MEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IOOPER_PREDEC-PRE3_MEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IOOPER_PREDEC-PRE3_MEINH.
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_IOOPER_PREDEC_STR, 
PRE1_STTXT TYPE STRING,
PRE2_STTXT TYPE STRING,
PRE3_STTXT TYPE STRING,
PRE1_STATUS TYPE STRING,
PRE2_STATUS TYPE STRING,
PRE3_STATUS TYPE STRING,
PRE1_QUANT TYPE STRING,
PRE2_QUANT TYPE STRING,
PRE3_QUANT TYPE STRING,
PRE1_MGVRG TYPE STRING,
PRE1_LMNGA TYPE STRING,
PRE1_MEINH TYPE STRING,
PRE2_MGVRG TYPE STRING,
PRE2_LMNGA TYPE STRING,
PRE2_MEINH TYPE STRING,
PRE3_MGVRG TYPE STRING,
PRE3_LMNGA TYPE STRING,
PRE3_MEINH TYPE STRING,
PRE1_SSEDD TYPE STRING,
PRE1_SSEDZ TYPE STRING,
PRE1_IEDD TYPE STRING,
PRE1_IEDZ TYPE STRING,
PRE2_SSEDD TYPE STRING,
PRE2_SSEDZ TYPE STRING,
PRE2_IEDD TYPE STRING,
PRE2_IEDZ TYPE STRING,
PRE3_SSEDD TYPE STRING,
PRE3_SSEDZ TYPE STRING,
PRE3_IEDD TYPE STRING,
PRE3_IEDZ TYPE STRING,
PRE1_ARBPL TYPE STRING,
PRE2_ARBPL TYPE STRING,
PRE3_ARBPL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IOOPER_PREDEC_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_IOOPER_PREDEC_STR-PRE1_STTXT sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_STTXT sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_STTXT sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_STATUS sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_STATUS sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_STATUS sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_QUANT sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_QUANT sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_QUANT sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_MGVRG sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_LMNGA sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_MEINH sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_MGVRG sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_LMNGA sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_MEINH sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_MGVRG sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_LMNGA sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_MEINH sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_SSEDD sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_SSEDZ sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_IEDD sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_IEDZ sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_SSEDD sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_SSEDZ sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_IEDD sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_IEDZ sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_SSEDD sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_SSEDZ sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_IEDD sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_IEDZ sy-vline 
WA_IOOPER_PREDEC_STR-PRE1_ARBPL sy-vline 
WA_IOOPER_PREDEC_STR-PRE2_ARBPL sy-vline 
WA_IOOPER_PREDEC_STR-PRE3_ARBPL sy-vline      INTO ld_text SEPARATED BY SPACE.

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