ABAP Select data from SAP table PIQST_MODULE_ALV_DSP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQST_MODULE_ALV_DSP
*  INTO TABLE @DATA(IT_PIQST_MODULE_ALV_DSP2).
*--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_PIQST_MODULE_ALV_DSP INDEX 1 INTO DATA(WA_PIQST_MODULE_ALV_DSP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQST_MODULE_ALV_DSP>-OBJ_TYPE = 1.
<PIQST_MODULE_ALV_DSP>-SM_SHORT = 1.
<PIQST_MODULE_ALV_DSP>-SM_STEXT = 1.
<PIQST_MODULE_ALV_DSP>-NO_OF_STUDENTS = 1.
<PIQST_MODULE_ALV_DSP>-SUB_COUNT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQST_MODULE_ALV_DSP-COUNT_ORIGIN, sy-vline,
  WA_PIQST_MODULE_ALV_DSP-COUNT_ORIGIN_TXT, sy-vline,
  WA_PIQST_MODULE_ALV_DSP-STUDENT_ID, sy-vline,
  WA_PIQST_MODULE_ALV_DSP-STUDENT_NAME, sy-vline,
  WA_PIQST_MODULE_ALV_DSP-STUDENT_OBJID, sy-vline,
  WA_PIQST_MODULE_ALV_DSP-STGRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQST_MODULE_ALV_DSP 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_PIQST_MODULE_ALV_DSP 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_PIQST_MODULE_ALV_DSP INTO WA_PIQST_MODULE_ALV_DSP.


*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.

*Conversion exit PIQST, internal->external for field STUDENT_ID
CALL FUNCTION 'CONVERSION_EXIT_PIQST_OUTPUT'
  EXPORTING
    input =                      WA_PIQST_MODULE_ALV_DSP-STUDENT_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PIQST_MODULE_ALV_DSP-STUDENT_ID.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PIQST_MODULE_ALV_DSP_STR, 
OBJ_TYPE TYPE STRING,
SM_SHORT TYPE STRING,
SM_STEXT TYPE STRING,
NO_OF_STUDENTS TYPE STRING,
SUB_COUNT TYPE STRING,
COUNT_ORIGIN TYPE STRING,
COUNT_ORIGIN_TXT TYPE STRING,
STUDENT_ID TYPE STRING,
STUDENT_NAME TYPE STRING,
STUDENT_OBJID TYPE STRING,
STGRP TYPE STRING,
STGRPTXT TYPE STRING,
PROGRAM_OBJID TYPE STRING,
PROGRAM_SHORT TYPE STRING,
PROGRAM_STEXT TYPE STRING,
PROGRAM_TYPE TYPE STRING,
PROGRAM_TYPETXT TYPE STRING,
PROG_TYPE TYPE STRING,
PROG_TYPE_TXT TYPE STRING,
PG_RESULT TYPE STRING,
PG_RESULTT TYPE STRING,
PG_RESULT_STATUS TYPE STRING,
PG_RESULT_STATUST TYPE STRING,
BOOK_CND TYPE STRING,
SM_OBJID TYPE STRING,
PERYR TYPE STRING,
PERYT TYPE STRING,
PERID TYPE STRING,
PERIT TYPE STRING,
SE_OBJID TYPE STRING,
SE_SHORT TYPE STRING,
SE_STEXT TYPE STRING,
E_OBJID TYPE STRING,
E_OTYPE TYPE STRING,
E_SHORT TYPE STRING,
E_STEXT TYPE STRING,
SM_CAP_MIN TYPE STRING,
SM_CAP_OPT TYPE STRING,
SM_CAP_MAX TYPE STRING,
SE_CAP_MIN TYPE STRING,
SE_CAP_OPT TYPE STRING,
SE_CAP_MAX TYPE STRING,
SE_OFFERED TYPE STRING,
E_CAP_MIN TYPE STRING,
E_CAP_OPT TYPE STRING,
E_CAP_MAX TYPE STRING,
ST_F_OBJID TYPE STRING,
ST_F_SHORT TYPE STRING,
ST_F_STEXT TYPE STRING,
AVAIL_PLACES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQST_MODULE_ALV_DSP_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_PIQST_MODULE_ALV_DSP_STR-OBJ_TYPE sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SM_SHORT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SM_STEXT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-NO_OF_STUDENTS sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SUB_COUNT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-COUNT_ORIGIN sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-COUNT_ORIGIN_TXT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-STUDENT_ID sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-STUDENT_NAME sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-STUDENT_OBJID sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-STGRP sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-STGRPTXT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PROGRAM_OBJID sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PROGRAM_SHORT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PROGRAM_STEXT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PROGRAM_TYPE sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PROGRAM_TYPETXT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PROG_TYPE sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PROG_TYPE_TXT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PG_RESULT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PG_RESULTT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PG_RESULT_STATUS sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PG_RESULT_STATUST sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-BOOK_CND sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SM_OBJID sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PERYR sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PERYT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PERID sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-PERIT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SE_OBJID sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SE_SHORT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SE_STEXT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-E_OBJID sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-E_OTYPE sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-E_SHORT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-E_STEXT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SM_CAP_MIN sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SM_CAP_OPT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SM_CAP_MAX sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SE_CAP_MIN sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SE_CAP_OPT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SE_CAP_MAX sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-SE_OFFERED sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-E_CAP_MIN sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-E_CAP_OPT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-E_CAP_MAX sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-ST_F_OBJID sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-ST_F_SHORT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-ST_F_STEXT sy-vline 
WA_PIQST_MODULE_ALV_DSP_STR-AVAIL_PLACES sy-vline      INTO ld_text SEPARATED BY SPACE.

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