ABAP Select data from SAP table PIQ_DE_ST_REG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQ_DE_ST_REG
*  INTO TABLE @DATA(IT_PIQ_DE_ST_REG2).
*--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_PIQ_DE_ST_REG INDEX 1 INTO DATA(WA_PIQ_DE_ST_REG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQ_DE_ST_REG>-ST_OBJID = 1.
<PIQ_DE_ST_REG>-CS_OBJID = 1.
<PIQ_DE_ST_REG>-SC_OBJID = 1.
<PIQ_DE_ST_REG>-CS_PRIOX = 1.
<PIQ_DE_ST_REG>-APPTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQ_DE_ST_REG-BEGDA, sy-vline,
  WA_PIQ_DE_ST_REG-ENDDA, sy-vline,
  WA_PIQ_DE_ST_REG-PERYR, sy-vline,
  WA_PIQ_DE_ST_REG-PERID, sy-vline,
  WA_PIQ_DE_ST_REG-ACLEVEL, sy-vline,
  WA_PIQ_DE_ST_REG-REGDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQ_DE_ST_REG 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_PIQ_DE_ST_REG 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_PIQ_DE_ST_REG INTO WA_PIQ_DE_ST_REG.


*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 STUDENT12
CALL FUNCTION 'CONVERSION_EXIT_PIQST_OUTPUT'
  EXPORTING
    input =                      WA_PIQ_DE_ST_REG-STUDENT12
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PIQ_DE_ST_REG-STUDENT12.
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_PIQ_DE_ST_REG_STR, 
ST_OBJID TYPE STRING,
CS_OBJID TYPE STRING,
SC_OBJID TYPE STRING,
CS_PRIOX TYPE STRING,
APPTYPE TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
PERYR TYPE STRING,
PERID TYPE STRING,
ACLEVEL TYPE STRING,
REGDATE TYPE STRING,
PARTT TYPE STRING,
REG_APPTYPE TYPE STRING,
LEAVE_REASON TYPE STRING,
FEEFL TYPE STRING,
PERCT TYPE STRING,
APPREASON TYPE STRING,
PROGCLASS TYPE STRING,
ENRCATEG TYPE STRING,
PR_STATUS TYPE STRING,
PRS_STATE TYPE STRING,
REGCLASS TYPE STRING,
CANCPROCESS TYPE STRING,
CANCREASON TYPE STRING,
CANCDATE TYPE STRING,
ADM_GUID TYPE STRING,
STUDENT12 TYPE STRING,
ST_STEXT TYPE STRING,
SC_SHORT TYPE STRING,
SC_STEXT TYPE STRING,
O_OTYPE TYPE STRING,
O_OBJID TYPE STRING,
O_SEARK TYPE STRING,
O_SHORT TYPE STRING,
O_STEXT TYPE STRING,
PERYT TYPE STRING,
PERIT TYPE STRING,
ACLEVELT TYPE STRING,
REGSTATUSQF TYPE STRING,
REGSTATUS TYPE STRING,
ACLEVELVAR TYPE STRING,
VARID TYPE STRING,
VARIDUNIT TYPE STRING,
LEAVE_REASONT TYPE STRING,
LEAVE TYPE STRING,
ACTST TYPE STRING,
RESTRICTED TYPE STRING,
PROGCLASST TYPE STRING,
PROGCVAR TYPE STRING,
ENRCATEGT TYPE STRING,
DEGREE_SEEK TYPE STRING,
CSFIRST TYPE STRING,
CSOTHER TYPE STRING,
REGCLASST TYPE STRING,
CANCEL_PROCESST TYPE STRING,
CANCEL_REASONT TYPE STRING,
PREPSEM TYPE STRING,
UNIVERSITYSEM TYPE STRING,
LEAVEOFABSSEM TYPE STRING,
INTERNSHIPSEM TYPE STRING,
INTERRUPTSEM TYPE STRING,
STUDYTYPE TYPE STRING,
FULLPARTDUAL TYPE STRING,
TARGET_DEGREE TYPE STRING,
PARTTYPE TYPE STRING,
PARTTYPE_TXT TYPE STRING,
PARTREASON TYPE STRING,
PHD_PROG_TYPE TYPE STRING,
CLINICSEM TYPE STRING,
COHORT_SEM TYPE STRING,
CLINIC_COHSEM TYPE STRING,
CLINIC_SUBSEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQ_DE_ST_REG_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_PIQ_DE_ST_REG_STR-ST_OBJID sy-vline 
WA_PIQ_DE_ST_REG_STR-CS_OBJID sy-vline 
WA_PIQ_DE_ST_REG_STR-SC_OBJID sy-vline 
WA_PIQ_DE_ST_REG_STR-CS_PRIOX sy-vline 
WA_PIQ_DE_ST_REG_STR-APPTYPE sy-vline 
WA_PIQ_DE_ST_REG_STR-BEGDA sy-vline 
WA_PIQ_DE_ST_REG_STR-ENDDA sy-vline 
WA_PIQ_DE_ST_REG_STR-PERYR sy-vline 
WA_PIQ_DE_ST_REG_STR-PERID sy-vline 
WA_PIQ_DE_ST_REG_STR-ACLEVEL sy-vline 
WA_PIQ_DE_ST_REG_STR-REGDATE sy-vline 
WA_PIQ_DE_ST_REG_STR-PARTT sy-vline 
WA_PIQ_DE_ST_REG_STR-REG_APPTYPE sy-vline 
WA_PIQ_DE_ST_REG_STR-LEAVE_REASON sy-vline 
WA_PIQ_DE_ST_REG_STR-FEEFL sy-vline 
WA_PIQ_DE_ST_REG_STR-PERCT sy-vline 
WA_PIQ_DE_ST_REG_STR-APPREASON sy-vline 
WA_PIQ_DE_ST_REG_STR-PROGCLASS sy-vline 
WA_PIQ_DE_ST_REG_STR-ENRCATEG sy-vline 
WA_PIQ_DE_ST_REG_STR-PR_STATUS sy-vline 
WA_PIQ_DE_ST_REG_STR-PRS_STATE sy-vline 
WA_PIQ_DE_ST_REG_STR-REGCLASS sy-vline 
WA_PIQ_DE_ST_REG_STR-CANCPROCESS sy-vline 
WA_PIQ_DE_ST_REG_STR-CANCREASON sy-vline 
WA_PIQ_DE_ST_REG_STR-CANCDATE sy-vline 
WA_PIQ_DE_ST_REG_STR-ADM_GUID sy-vline 
WA_PIQ_DE_ST_REG_STR-STUDENT12 sy-vline 
WA_PIQ_DE_ST_REG_STR-ST_STEXT sy-vline 
WA_PIQ_DE_ST_REG_STR-SC_SHORT sy-vline 
WA_PIQ_DE_ST_REG_STR-SC_STEXT sy-vline 
WA_PIQ_DE_ST_REG_STR-O_OTYPE sy-vline 
WA_PIQ_DE_ST_REG_STR-O_OBJID sy-vline 
WA_PIQ_DE_ST_REG_STR-O_SEARK sy-vline 
WA_PIQ_DE_ST_REG_STR-O_SHORT sy-vline 
WA_PIQ_DE_ST_REG_STR-O_STEXT sy-vline 
WA_PIQ_DE_ST_REG_STR-PERYT sy-vline 
WA_PIQ_DE_ST_REG_STR-PERIT sy-vline 
WA_PIQ_DE_ST_REG_STR-ACLEVELT sy-vline 
WA_PIQ_DE_ST_REG_STR-REGSTATUSQF sy-vline 
WA_PIQ_DE_ST_REG_STR-REGSTATUS sy-vline 
WA_PIQ_DE_ST_REG_STR-ACLEVELVAR sy-vline 
WA_PIQ_DE_ST_REG_STR-VARID sy-vline 
WA_PIQ_DE_ST_REG_STR-VARIDUNIT sy-vline 
WA_PIQ_DE_ST_REG_STR-LEAVE_REASONT sy-vline 
WA_PIQ_DE_ST_REG_STR-LEAVE sy-vline 
WA_PIQ_DE_ST_REG_STR-ACTST sy-vline 
WA_PIQ_DE_ST_REG_STR-RESTRICTED sy-vline 
WA_PIQ_DE_ST_REG_STR-PROGCLASST sy-vline 
WA_PIQ_DE_ST_REG_STR-PROGCVAR sy-vline 
WA_PIQ_DE_ST_REG_STR-ENRCATEGT sy-vline 
WA_PIQ_DE_ST_REG_STR-DEGREE_SEEK sy-vline 
WA_PIQ_DE_ST_REG_STR-CSFIRST sy-vline 
WA_PIQ_DE_ST_REG_STR-CSOTHER sy-vline 
WA_PIQ_DE_ST_REG_STR-REGCLASST sy-vline 
WA_PIQ_DE_ST_REG_STR-CANCEL_PROCESST sy-vline 
WA_PIQ_DE_ST_REG_STR-CANCEL_REASONT sy-vline 
WA_PIQ_DE_ST_REG_STR-PREPSEM sy-vline 
WA_PIQ_DE_ST_REG_STR-UNIVERSITYSEM sy-vline 
WA_PIQ_DE_ST_REG_STR-LEAVEOFABSSEM sy-vline 
WA_PIQ_DE_ST_REG_STR-INTERNSHIPSEM sy-vline 
WA_PIQ_DE_ST_REG_STR-INTERRUPTSEM sy-vline 
WA_PIQ_DE_ST_REG_STR-STUDYTYPE sy-vline 
WA_PIQ_DE_ST_REG_STR-FULLPARTDUAL sy-vline 
WA_PIQ_DE_ST_REG_STR-TARGET_DEGREE sy-vline 
WA_PIQ_DE_ST_REG_STR-PARTTYPE sy-vline 
WA_PIQ_DE_ST_REG_STR-PARTTYPE_TXT sy-vline 
WA_PIQ_DE_ST_REG_STR-PARTREASON sy-vline 
WA_PIQ_DE_ST_REG_STR-PHD_PROG_TYPE sy-vline 
WA_PIQ_DE_ST_REG_STR-CLINICSEM sy-vline 
WA_PIQ_DE_ST_REG_STR-COHORT_SEM sy-vline 
WA_PIQ_DE_ST_REG_STR-CLINIC_COHSEM sy-vline 
WA_PIQ_DE_ST_REG_STR-CLINIC_SUBSEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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