ABAP Select data from SAP table TJNEXTISSUE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TJNEXTISSUE
*  INTO TABLE @DATA(IT_TJNEXTISSUE2).
*--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_TJNEXTISSUE INDEX 1 INTO DATA(WA_TJNEXTISSUE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TJNEXTISSUE>-MANDT = 1.
<TJNEXTISSUE>-ID = 1.
<TJNEXTISSUE>-DETERMINATION01 = 1.
<TJNEXTISSUE>-DETERMINATION02 = 1.
<TJNEXTISSUE>-DETERMINATION03 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TJNEXTISSUE-DETERMINATION04, sy-vline,
  WA_TJNEXTISSUE-DETERMINATION05, sy-vline,
  WA_TJNEXTISSUE-CHECK01, sy-vline,
  WA_TJNEXTISSUE-CHECK02, sy-vline,
  WA_TJNEXTISSUE-CHECK03, sy-vline,
  WA_TJNEXTISSUE-CHECK04, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TJNEXTISSUE 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_TJNEXTISSUE 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_TJNEXTISSUE INTO WA_TJNEXTISSUE.


*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_TJNEXTISSUE_STR, 
MANDT TYPE STRING,
ID TYPE STRING,
DETERMINATION01 TYPE STRING,
DETERMINATION02 TYPE STRING,
DETERMINATION03 TYPE STRING,
DETERMINATION04 TYPE STRING,
DETERMINATION05 TYPE STRING,
CHECK01 TYPE STRING,
CHECK02 TYPE STRING,
CHECK03 TYPE STRING,
CHECK04 TYPE STRING,
CHECK05 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TJNEXTISSUE_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_TJNEXTISSUE_STR-MANDT sy-vline 
WA_TJNEXTISSUE_STR-ID sy-vline 
WA_TJNEXTISSUE_STR-DETERMINATION01 sy-vline 
WA_TJNEXTISSUE_STR-DETERMINATION02 sy-vline 
WA_TJNEXTISSUE_STR-DETERMINATION03 sy-vline 
WA_TJNEXTISSUE_STR-DETERMINATION04 sy-vline 
WA_TJNEXTISSUE_STR-DETERMINATION05 sy-vline 
WA_TJNEXTISSUE_STR-CHECK01 sy-vline 
WA_TJNEXTISSUE_STR-CHECK02 sy-vline 
WA_TJNEXTISSUE_STR-CHECK03 sy-vline 
WA_TJNEXTISSUE_STR-CHECK04 sy-vline 
WA_TJNEXTISSUE_STR-CHECK05 sy-vline      INTO ld_text SEPARATED BY SPACE.

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