ABAP Select data from SAP table TTREV_NODE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TTREV_NODE
*  INTO TABLE @DATA(IT_TTREV_NODE2).
*--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_TTREV_NODE INDEX 1 INTO DATA(WA_TTREV_NODE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TTREV_NODE>-VERSION = 1.
<TTREV_NODE>-NODE_COUNT = 1.
<TTREV_NODE>-NODE_ID = 1.
<TTREV_NODE>-NODE_TYPE = 1.
<TTREV_NODE>-NODE_LEVEL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TTREV_NODE-EXTENSION, sy-vline,
  WA_TTREV_NODE-PARENT_ID, sy-vline,
  WA_TTREV_NODE-BROTHER_ID, sy-vline,
  WA_TTREV_NODE-TREE_ID, sy-vline,
  WA_TTREV_NODE-REFNODE_ID, sy-vline,
  WA_TTREV_NODE-REFTREE_ID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TTREV_NODE 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_TTREV_NODE 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_TTREV_NODE INTO WA_TTREV_NODE.


*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_TTREV_NODE_STR, 
VERSION TYPE STRING,
NODE_COUNT TYPE STRING,
NODE_ID TYPE STRING,
NODE_TYPE TYPE STRING,
NODE_LEVEL TYPE STRING,
EXTENSION TYPE STRING,
PARENT_ID TYPE STRING,
BROTHER_ID TYPE STRING,
TREE_ID TYPE STRING,
REFNODE_ID TYPE STRING,
REFTREE_ID TYPE STRING,
LOG_REF TYPE STRING,
LOCAL_FLAG TYPE STRING,
VALID_F_R TYPE STRING,
VALID_T_R TYPE STRING,
VALID_F_D TYPE STRING,
VALID_T_D TYPE STRING,
FORCE_PLUS TYPE STRING,
W_SUBNODES TYPE STRING,
FILTER_ID TYPE STRING,
LOST_EXT TYPE STRING,
LOST_NODE TYPE STRING,
APPL_FLAG1 TYPE STRING,
APPL_FLAG2 TYPE STRING,
APPL_FLAG3 TYPE STRING,
FUSER TYPE STRING,
FDATE TYPE STRING,
FTIME TYPE STRING,
FRELEASE TYPE STRING,
LUSER TYPE STRING,
LDATE TYPE STRING,
LTIME TYPE STRING,
LRELEASE TYPE STRING,
NODE_KEY TYPE STRING,
PARENT_KEY TYPE STRING,
IS_CUT TYPE STRING,
CHECKBOXST TYPE STRING,
MANUAL_SET TYPE STRING,
NOFRONTEND TYPE STRING,
NO_DISPLAY TYPE STRING,
HIDDEN_FL TYPE STRING,
DOUBLE_FL TYPE STRING,
DEFAULTFLG TYPE STRING,
COPY_NODE TYPE STRING,
COPY_TREE TYPE STRING,
COPNODFRST TYPE STRING,
COPTREFRST TYPE STRING,
COMPONENT TYPE STRING,
SYSTEMINST TYPE STRING,
COMPRELFR TYPE STRING,
COMPRELTO TYPE STRING,
NODRAGDROP TYPE STRING,
PRDVERSFR TYPE STRING,
PRDVERSTO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TTREV_NODE_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_TTREV_NODE_STR-VERSION sy-vline 
WA_TTREV_NODE_STR-NODE_COUNT sy-vline 
WA_TTREV_NODE_STR-NODE_ID sy-vline 
WA_TTREV_NODE_STR-NODE_TYPE sy-vline 
WA_TTREV_NODE_STR-NODE_LEVEL sy-vline 
WA_TTREV_NODE_STR-EXTENSION sy-vline 
WA_TTREV_NODE_STR-PARENT_ID sy-vline 
WA_TTREV_NODE_STR-BROTHER_ID sy-vline 
WA_TTREV_NODE_STR-TREE_ID sy-vline 
WA_TTREV_NODE_STR-REFNODE_ID sy-vline 
WA_TTREV_NODE_STR-REFTREE_ID sy-vline 
WA_TTREV_NODE_STR-LOG_REF sy-vline 
WA_TTREV_NODE_STR-LOCAL_FLAG sy-vline 
WA_TTREV_NODE_STR-VALID_F_R sy-vline 
WA_TTREV_NODE_STR-VALID_T_R sy-vline 
WA_TTREV_NODE_STR-VALID_F_D sy-vline 
WA_TTREV_NODE_STR-VALID_T_D sy-vline 
WA_TTREV_NODE_STR-FORCE_PLUS sy-vline 
WA_TTREV_NODE_STR-W_SUBNODES sy-vline 
WA_TTREV_NODE_STR-FILTER_ID sy-vline 
WA_TTREV_NODE_STR-LOST_EXT sy-vline 
WA_TTREV_NODE_STR-LOST_NODE sy-vline 
WA_TTREV_NODE_STR-APPL_FLAG1 sy-vline 
WA_TTREV_NODE_STR-APPL_FLAG2 sy-vline 
WA_TTREV_NODE_STR-APPL_FLAG3 sy-vline 
WA_TTREV_NODE_STR-FUSER sy-vline 
WA_TTREV_NODE_STR-FDATE sy-vline 
WA_TTREV_NODE_STR-FTIME sy-vline 
WA_TTREV_NODE_STR-FRELEASE sy-vline 
WA_TTREV_NODE_STR-LUSER sy-vline 
WA_TTREV_NODE_STR-LDATE sy-vline 
WA_TTREV_NODE_STR-LTIME sy-vline 
WA_TTREV_NODE_STR-LRELEASE sy-vline 
WA_TTREV_NODE_STR-NODE_KEY sy-vline 
WA_TTREV_NODE_STR-PARENT_KEY sy-vline 
WA_TTREV_NODE_STR-IS_CUT sy-vline 
WA_TTREV_NODE_STR-CHECKBOXST sy-vline 
WA_TTREV_NODE_STR-MANUAL_SET sy-vline 
WA_TTREV_NODE_STR-NOFRONTEND sy-vline 
WA_TTREV_NODE_STR-NO_DISPLAY sy-vline 
WA_TTREV_NODE_STR-HIDDEN_FL sy-vline 
WA_TTREV_NODE_STR-DOUBLE_FL sy-vline 
WA_TTREV_NODE_STR-DEFAULTFLG sy-vline 
WA_TTREV_NODE_STR-COPY_NODE sy-vline 
WA_TTREV_NODE_STR-COPY_TREE sy-vline 
WA_TTREV_NODE_STR-COPNODFRST sy-vline 
WA_TTREV_NODE_STR-COPTREFRST sy-vline 
WA_TTREV_NODE_STR-COMPONENT sy-vline 
WA_TTREV_NODE_STR-SYSTEMINST sy-vline 
WA_TTREV_NODE_STR-COMPRELFR sy-vline 
WA_TTREV_NODE_STR-COMPRELTO sy-vline 
WA_TTREV_NODE_STR-NODRAGDROP sy-vline 
WA_TTREV_NODE_STR-PRDVERSFR sy-vline 
WA_TTREV_NODE_STR-PRDVERSTO sy-vline      INTO ld_text SEPARATED BY SPACE.

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