ABAP Select data from SAP table TTET_I_HEAD_COM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TTET_I_HEAD_COM
*  INTO TABLE @DATA(IT_TTET_I_HEAD_COM2).
*--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_TTET_I_HEAD_COM INDEX 1 INTO DATA(WA_TTET_I_HEAD_COM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TTET_I_HEAD_COM>-ITEMNODEID = 1.
<TTET_I_HEAD_COM>-REPORTINGDATE = 1.
<TTET_I_HEAD_COM>-COMMAND = 1.
<TTET_I_HEAD_COM>-PROCESSINGMOD = 1.
<TTET_I_HEAD_COM>-TRACEMODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TTET_I_HEAD_COM-TTESESSIONID, sy-vline,
  WA_TTET_I_HEAD_COM-TTEDOCUMENTID, sy-vline,
  WA_TTET_I_HEAD_COM-TEXTOUTPUT, sy-vline,
  WA_TTET_I_HEAD_COM-LANGUAGE, sy-vline,
  WA_TTET_I_HEAD_COM-SYSTEMID1, sy-vline,
  WA_TTET_I_HEAD_COM-SYSTEMID2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TTET_I_HEAD_COM 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_TTET_I_HEAD_COM 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_TTET_I_HEAD_COM INTO WA_TTET_I_HEAD_COM.


*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_TTET_I_HEAD_COM_STR, 
ITEMNODEID TYPE STRING,
REPORTINGDATE TYPE STRING,
COMMAND TYPE STRING,
PROCESSINGMOD TYPE STRING,
TRACEMODE TYPE STRING,
TTESESSIONID TYPE STRING,
TTEDOCUMENTID TYPE STRING,
TEXTOUTPUT TYPE STRING,
LANGUAGE TYPE STRING,
SYSTEMID1 TYPE STRING,
SYSTEMID2 TYPE STRING,
SYSTEMVERSION TYPE STRING,
INTERFACEVERSION TYPE STRING,
CALLINGORG TYPE STRING,
OWNPARTNERID TYPE STRING,
CALLINGDOCID1 TYPE STRING,
CALLINGDOCID2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TTET_I_HEAD_COM_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_TTET_I_HEAD_COM_STR-ITEMNODEID sy-vline 
WA_TTET_I_HEAD_COM_STR-REPORTINGDATE sy-vline 
WA_TTET_I_HEAD_COM_STR-COMMAND sy-vline 
WA_TTET_I_HEAD_COM_STR-PROCESSINGMOD sy-vline 
WA_TTET_I_HEAD_COM_STR-TRACEMODE sy-vline 
WA_TTET_I_HEAD_COM_STR-TTESESSIONID sy-vline 
WA_TTET_I_HEAD_COM_STR-TTEDOCUMENTID sy-vline 
WA_TTET_I_HEAD_COM_STR-TEXTOUTPUT sy-vline 
WA_TTET_I_HEAD_COM_STR-LANGUAGE sy-vline 
WA_TTET_I_HEAD_COM_STR-SYSTEMID1 sy-vline 
WA_TTET_I_HEAD_COM_STR-SYSTEMID2 sy-vline 
WA_TTET_I_HEAD_COM_STR-SYSTEMVERSION sy-vline 
WA_TTET_I_HEAD_COM_STR-INTERFACEVERSION sy-vline 
WA_TTET_I_HEAD_COM_STR-CALLINGORG sy-vline 
WA_TTET_I_HEAD_COM_STR-OWNPARTNERID sy-vline 
WA_TTET_I_HEAD_COM_STR-CALLINGDOCID1 sy-vline 
WA_TTET_I_HEAD_COM_STR-CALLINGDOCID2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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