ABAP Select data from SAP table TXX_JOIN_CONDITIONS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TXX_JOIN_CONDITIONS
*  INTO TABLE @DATA(IT_TXX_JOIN_CONDITIONS2).
*--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_TXX_JOIN_CONDITIONS INDEX 1 INTO DATA(WA_TXX_JOIN_CONDITIONS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TXX_JOIN_CONDITIONS>-MANDT = 1.
<TXX_JOIN_CONDITIONS>-TXVIEW = 1.
<TXX_JOIN_CONDITIONS>-SEGMENT1 = 1.
<TXX_JOIN_CONDITIONS>-FIELD1 = 1.
<TXX_JOIN_CONDITIONS>-SEGMENT2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TXX_JOIN_CONDITIONS-FIELD2, sy-vline,
  WA_TXX_JOIN_CONDITIONS-CONSTANT, sy-vline,
  WA_TXX_JOIN_CONDITIONS-NAME, sy-vline,
  WA_TXX_JOIN_CONDITIONS-VIEWPRAEFIX, sy-vline,
  WA_TXX_JOIN_CONDITIONS-VIEWFIELD, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_TXX_JOIN_CONDITIONS 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_TXX_JOIN_CONDITIONS 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_TXX_JOIN_CONDITIONS INTO WA_TXX_JOIN_CONDITIONS.


*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_TXX_JOIN_CONDITIONS_STR, 
MANDT TYPE STRING,
TXVIEW TYPE STRING,
SEGMENT1 TYPE STRING,
FIELD1 TYPE STRING,
SEGMENT2 TYPE STRING,
FIELD2 TYPE STRING,
CONSTANT TYPE STRING,
NAME TYPE STRING,
VIEWPRAEFIX TYPE STRING,
VIEWFIELD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TXX_JOIN_CONDITIONS_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_TXX_JOIN_CONDITIONS_STR-MANDT sy-vline 
WA_TXX_JOIN_CONDITIONS_STR-TXVIEW sy-vline 
WA_TXX_JOIN_CONDITIONS_STR-SEGMENT1 sy-vline 
WA_TXX_JOIN_CONDITIONS_STR-FIELD1 sy-vline 
WA_TXX_JOIN_CONDITIONS_STR-SEGMENT2 sy-vline 
WA_TXX_JOIN_CONDITIONS_STR-FIELD2 sy-vline 
WA_TXX_JOIN_CONDITIONS_STR-CONSTANT sy-vline 
WA_TXX_JOIN_CONDITIONS_STR-NAME sy-vline 
WA_TXX_JOIN_CONDITIONS_STR-VIEWPRAEFIX sy-vline 
WA_TXX_JOIN_CONDITIONS_STR-VIEWFIELD sy-vline      INTO ld_text SEPARATED BY SPACE.

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