ABAP Select data from SAP table DMEX_TREE_HEAD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DMEX_TREE_HEAD
*  INTO TABLE @DATA(IT_DMEX_TREE_HEAD2).
*--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_DMEX_TREE_HEAD INDEX 1 INTO DATA(WA_DMEX_TREE_HEAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DMEX_TREE_HEAD>-TREE_TYPE = 1.
<DMEX_TREE_HEAD>-TREE_ID = 1.
<DMEX_TREE_HEAD>-VERSION = 1.
<DMEX_TREE_HEAD>-PARAM_STRUC = 1.
<DMEX_TREE_HEAD>-FM_FIELDTP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DMEX_TREE_HEAD-SGMG_DELIM, sy-vline,
  WA_DMEX_TREE_HEAD-SEGM_DELIM, sy-vline,
  WA_DMEX_TREE_HEAD-COMP_DELIM, sy-vline,
  WA_DMEX_TREE_HEAD-COMPR_RULE, sy-vline,
  WA_DMEX_TREE_HEAD-ESCAPE_SYMB, sy-vline,
  WA_DMEX_TREE_HEAD-SF_NAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DMEX_TREE_HEAD 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_DMEX_TREE_HEAD 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_DMEX_TREE_HEAD INTO WA_DMEX_TREE_HEAD.


*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_DMEX_TREE_HEAD_STR, 
TREE_TYPE TYPE STRING,
TREE_ID TYPE STRING,
VERSION TYPE STRING,
PARAM_STRUC TYPE STRING,
FM_FIELDTP TYPE STRING,
SGMG_DELIM TYPE STRING,
SEGM_DELIM TYPE STRING,
COMP_DELIM TYPE STRING,
COMPR_RULE TYPE STRING,
ESCAPE_SYMB TYPE STRING,
SF_NAME TYPE STRING,
FIRSTNODE_ID TYPE STRING,
SGMG_CR TYPE STRING,
SGMG_LF TYPE STRING,
SEGM_CR TYPE STRING,
SEGM_LF TYPE STRING,
TDFORM TYPE STRING,
FILESHEET TYPE STRING,
VERS_USER TYPE STRING,
VERS_DATE TYPE STRING,
VERS_TIME TYPE STRING,
CHARSET TYPE STRING,
CHARSET_EXCL TYPE STRING,
XSLTDESC TYPE STRING,
HANDLE_BYTES TYPE STRING,
VERSION_TYPE TYPE STRING,
REQUEST_ID TYPE STRING,
IF_TYPE TYPE STRING,
XMLEMPTYELEMENTPROCESSINGTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DMEX_TREE_HEAD_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_DMEX_TREE_HEAD_STR-TREE_TYPE sy-vline 
WA_DMEX_TREE_HEAD_STR-TREE_ID sy-vline 
WA_DMEX_TREE_HEAD_STR-VERSION sy-vline 
WA_DMEX_TREE_HEAD_STR-PARAM_STRUC sy-vline 
WA_DMEX_TREE_HEAD_STR-FM_FIELDTP sy-vline 
WA_DMEX_TREE_HEAD_STR-SGMG_DELIM sy-vline 
WA_DMEX_TREE_HEAD_STR-SEGM_DELIM sy-vline 
WA_DMEX_TREE_HEAD_STR-COMP_DELIM sy-vline 
WA_DMEX_TREE_HEAD_STR-COMPR_RULE sy-vline 
WA_DMEX_TREE_HEAD_STR-ESCAPE_SYMB sy-vline 
WA_DMEX_TREE_HEAD_STR-SF_NAME sy-vline 
WA_DMEX_TREE_HEAD_STR-FIRSTNODE_ID sy-vline 
WA_DMEX_TREE_HEAD_STR-SGMG_CR sy-vline 
WA_DMEX_TREE_HEAD_STR-SGMG_LF sy-vline 
WA_DMEX_TREE_HEAD_STR-SEGM_CR sy-vline 
WA_DMEX_TREE_HEAD_STR-SEGM_LF sy-vline 
WA_DMEX_TREE_HEAD_STR-TDFORM sy-vline 
WA_DMEX_TREE_HEAD_STR-FILESHEET sy-vline 
WA_DMEX_TREE_HEAD_STR-VERS_USER sy-vline 
WA_DMEX_TREE_HEAD_STR-VERS_DATE sy-vline 
WA_DMEX_TREE_HEAD_STR-VERS_TIME sy-vline 
WA_DMEX_TREE_HEAD_STR-CHARSET sy-vline 
WA_DMEX_TREE_HEAD_STR-CHARSET_EXCL sy-vline 
WA_DMEX_TREE_HEAD_STR-XSLTDESC sy-vline 
WA_DMEX_TREE_HEAD_STR-HANDLE_BYTES sy-vline 
WA_DMEX_TREE_HEAD_STR-VERSION_TYPE sy-vline 
WA_DMEX_TREE_HEAD_STR-REQUEST_ID sy-vline 
WA_DMEX_TREE_HEAD_STR-IF_TYPE sy-vline 
WA_DMEX_TREE_HEAD_STR-XMLEMPTYELEMENTPROCESSINGTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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