ABAP Select data from SAP table API_CH_ATT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM API_CH_ATT
*  INTO TABLE @DATA(IT_API_CH_ATT2).
*--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_API_CH_ATT INDEX 1 INTO DATA(WA_API_CH_ATT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<API_CH_ATT>-ATINN = 1.
<API_CH_ATT>-ATNAM = 1.
<API_CH_ATT>-ATBEZ = 1.
<API_CH_ATT>-ATFOR = 1.
<API_CH_ATT>-DTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_API_CH_ATT-ATEIN, sy-vline,
  WA_API_CH_ATT-ATERF, sy-vline,
  WA_API_CH_ATT-ATINT, sy-vline,
  WA_API_CH_ATT-ATSON, sy-vline,
  WA_API_CH_ATT-ATINP, sy-vline,
  WA_API_CH_ATT-ATGLO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_API_CH_ATT 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_API_CH_ATT 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_API_CH_ATT INTO WA_API_CH_ATT.


*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 ATINN, internal->external for field ATINN
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_API_CH_ATT-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_API_CH_ATT-ATINN.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ATINN, internal->external for field UDEFMMNR
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_API_CH_ATT-UDEFMMNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_API_CH_ATT-UDEFMMNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ATINN, internal->external for field OMERK
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_API_CH_ATT-OMERK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_API_CH_ATT-OMERK.
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_API_CH_ATT_STR, 
ATINN TYPE STRING,
ATNAM TYPE STRING,
ATBEZ TYPE STRING,
ATFOR TYPE STRING,
DTYPE TYPE STRING,
ATEIN TYPE STRING,
ATERF TYPE STRING,
ATINT TYPE STRING,
ATSON TYPE STRING,
ATINP TYPE STRING,
ATGLO TYPE STRING,
ATVIE TYPE STRING,
ANZST TYPE STRING,
ANZDZ TYPE STRING,
ATVOR TYPE STRING,
ATDIM TYPE STRING,
ATDEX TYPE STRING,
ATSCH TYPE STRING,
ATVSC TYPE STRING,
ATKLE TYPE STRING,
MSEHI TYPE STRING,
MSEH6 TYPE STRING,
ATWRD TYPE STRING,
ATFOD TYPE STRING,
ATKLA TYPE STRING,
ATMST TYPE STRING,
ATGLA TYPE STRING,
KNOBJ TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
ATPRT TYPE STRING,
ATPRF TYPE STRING,
DINKB TYPE STRING,
MAWS0 TYPE STRING,
MAWS1 TYPE STRING,
MAWS2 TYPE STRING,
MAWS3 TYPE STRING,
MAWS4 TYPE STRING,
MAWS5 TYPE STRING,
MAWS6 TYPE STRING,
MAWS7 TYPE STRING,
MAWS8 TYPE STRING,
MAWS9 TYPE STRING,
ATTAB TYPE STRING,
ATFEL TYPE STRING,
ATKON TYPE STRING,
BOOL TYPE STRING,
UDEFCLINT TYPE STRING,
UDEFMMNR TYPE STRING,
UDEF TYPE STRING,
OMERK TYPE STRING,
POSNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_API_CH_ATT_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_API_CH_ATT_STR-ATINN sy-vline 
WA_API_CH_ATT_STR-ATNAM sy-vline 
WA_API_CH_ATT_STR-ATBEZ sy-vline 
WA_API_CH_ATT_STR-ATFOR sy-vline 
WA_API_CH_ATT_STR-DTYPE sy-vline 
WA_API_CH_ATT_STR-ATEIN sy-vline 
WA_API_CH_ATT_STR-ATERF sy-vline 
WA_API_CH_ATT_STR-ATINT sy-vline 
WA_API_CH_ATT_STR-ATSON sy-vline 
WA_API_CH_ATT_STR-ATINP sy-vline 
WA_API_CH_ATT_STR-ATGLO sy-vline 
WA_API_CH_ATT_STR-ATVIE sy-vline 
WA_API_CH_ATT_STR-ANZST sy-vline 
WA_API_CH_ATT_STR-ANZDZ sy-vline 
WA_API_CH_ATT_STR-ATVOR sy-vline 
WA_API_CH_ATT_STR-ATDIM sy-vline 
WA_API_CH_ATT_STR-ATDEX sy-vline 
WA_API_CH_ATT_STR-ATSCH sy-vline 
WA_API_CH_ATT_STR-ATVSC sy-vline 
WA_API_CH_ATT_STR-ATKLE sy-vline 
WA_API_CH_ATT_STR-MSEHI sy-vline 
WA_API_CH_ATT_STR-MSEH6 sy-vline 
WA_API_CH_ATT_STR-ATWRD sy-vline 
WA_API_CH_ATT_STR-ATFOD sy-vline 
WA_API_CH_ATT_STR-ATKLA sy-vline 
WA_API_CH_ATT_STR-ATMST sy-vline 
WA_API_CH_ATT_STR-ATGLA sy-vline 
WA_API_CH_ATT_STR-KNOBJ sy-vline 
WA_API_CH_ATT_STR-DOKAR sy-vline 
WA_API_CH_ATT_STR-DOKNR sy-vline 
WA_API_CH_ATT_STR-DOKVR sy-vline 
WA_API_CH_ATT_STR-DOKTL sy-vline 
WA_API_CH_ATT_STR-ATPRT sy-vline 
WA_API_CH_ATT_STR-ATPRF sy-vline 
WA_API_CH_ATT_STR-DINKB sy-vline 
WA_API_CH_ATT_STR-MAWS0 sy-vline 
WA_API_CH_ATT_STR-MAWS1 sy-vline 
WA_API_CH_ATT_STR-MAWS2 sy-vline 
WA_API_CH_ATT_STR-MAWS3 sy-vline 
WA_API_CH_ATT_STR-MAWS4 sy-vline 
WA_API_CH_ATT_STR-MAWS5 sy-vline 
WA_API_CH_ATT_STR-MAWS6 sy-vline 
WA_API_CH_ATT_STR-MAWS7 sy-vline 
WA_API_CH_ATT_STR-MAWS8 sy-vline 
WA_API_CH_ATT_STR-MAWS9 sy-vline 
WA_API_CH_ATT_STR-ATTAB sy-vline 
WA_API_CH_ATT_STR-ATFEL sy-vline 
WA_API_CH_ATT_STR-ATKON sy-vline 
WA_API_CH_ATT_STR-BOOL sy-vline 
WA_API_CH_ATT_STR-UDEFCLINT sy-vline 
WA_API_CH_ATT_STR-UDEFMMNR sy-vline 
WA_API_CH_ATT_STR-UDEF sy-vline 
WA_API_CH_ATT_STR-OMERK sy-vline 
WA_API_CH_ATT_STR-POSNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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