ABAP Select data from SAP table J_3G_X031L_ALT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_3G_X031L_ALT 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 J_3G_X031L_ALT. 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 J_3G_X031L_ALT 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_J_3G_X031L_ALT TYPE STANDARD TABLE OF J_3G_X031L_ALT,
      WA_J_3G_X031L_ALT TYPE J_3G_X031L_ALT,
      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: <J_3G_X031L_ALT> TYPE J_3G_X031L_ALT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_3G_X031L_ALT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_3G_X031L_ALT
  INTO TABLE IT_J_3G_X031L_ALT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_3G_X031L_ALT
*  INTO TABLE @DATA(IT_J_3G_X031L_ALT2).
*--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_J_3G_X031L_ALT INDEX 1 INTO DATA(WA_J_3G_X031L_ALT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_3G_X031L_ALT ASSIGNING <J_3G_X031L_ALT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_3G_X031L_ALT>-TABNAME = 1.
<J_3G_X031L_ALT>-POSITION = 1.
<J_3G_X031L_ALT>-FLAG1 = 1.
<J_3G_X031L_ALT>-FLAG2 = 1.
<J_3G_X031L_ALT>-FIELDTYPE = 1.

ENDLOOP.

LOOP AT IT_J_3G_X031L_ALT INTO WA_J_3G_X031L_ALT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_3G_X031L_ALT-OFFSET, sy-vline,
  WA_J_3G_X031L_ALT-DBLENGTH, sy-vline,
  WA_J_3G_X031L_ALT-EXLENGTH, sy-vline,
  WA_J_3G_X031L_ALT-DECIMALS, sy-vline,
  WA_J_3G_X031L_ALT-FIELDNAME, sy-vline,
  WA_J_3G_X031L_ALT-ABTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_3G_X031L_ALT 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_J_3G_X031L_ALT 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_J_3G_X031L_ALT INTO WA_J_3G_X031L_ALT.


*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_J_3G_X031L_ALT_STR, 
TABNAME TYPE STRING,
POSITION TYPE STRING,
FLAG1 TYPE STRING,
FLAG2 TYPE STRING,
FIELDTYPE TYPE STRING,
OFFSET TYPE STRING,
DBLENGTH TYPE STRING,
EXLENGTH TYPE STRING,
DECIMALS TYPE STRING,
FIELDNAME TYPE STRING,
ABTYPE TYPE STRING,
DTYP TYPE STRING,
EXID TYPE STRING,
REFTABLE TYPE STRING,
REFFIELD TYPE STRING,
PRECFIELD TYPE STRING,
CONVEXIT TYPE STRING,
MEMORYID TYPE STRING,
CHECKTABLE TYPE STRING,
DIGITS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_3G_X031L_ALT_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_J_3G_X031L_ALT_STR-TABNAME sy-vline 
WA_J_3G_X031L_ALT_STR-POSITION sy-vline 
WA_J_3G_X031L_ALT_STR-FLAG1 sy-vline 
WA_J_3G_X031L_ALT_STR-FLAG2 sy-vline 
WA_J_3G_X031L_ALT_STR-FIELDTYPE sy-vline 
WA_J_3G_X031L_ALT_STR-OFFSET sy-vline 
WA_J_3G_X031L_ALT_STR-DBLENGTH sy-vline 
WA_J_3G_X031L_ALT_STR-EXLENGTH sy-vline 
WA_J_3G_X031L_ALT_STR-DECIMALS sy-vline 
WA_J_3G_X031L_ALT_STR-FIELDNAME sy-vline 
WA_J_3G_X031L_ALT_STR-ABTYPE sy-vline 
WA_J_3G_X031L_ALT_STR-DTYP sy-vline 
WA_J_3G_X031L_ALT_STR-EXID sy-vline 
WA_J_3G_X031L_ALT_STR-REFTABLE sy-vline 
WA_J_3G_X031L_ALT_STR-REFFIELD sy-vline 
WA_J_3G_X031L_ALT_STR-PRECFIELD sy-vline 
WA_J_3G_X031L_ALT_STR-CONVEXIT sy-vline 
WA_J_3G_X031L_ALT_STR-MEMORYID sy-vline 
WA_J_3G_X031L_ALT_STR-CHECKTABLE sy-vline 
WA_J_3G_X031L_ALT_STR-DIGITS sy-vline      INTO ld_text SEPARATED BY SPACE.

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