ABAP Select data from SAP table PIQ_STUDENTLDB_SSF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PIQ_STUDENTLDB_SSF 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_STUDENTLDB_SSF. 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_STUDENTLDB_SSF 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_STUDENTLDB_SSF TYPE STANDARD TABLE OF PIQ_STUDENTLDB_SSF,
      WA_PIQ_STUDENTLDB_SSF TYPE PIQ_STUDENTLDB_SSF,
      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_STUDENTLDB_SSF> TYPE PIQ_STUDENTLDB_SSF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PIQ_STUDENTLDB_SSF
*  INTO TABLE @DATA(IT_PIQ_STUDENTLDB_SSF2).
*--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_STUDENTLDB_SSF INDEX 1 INTO DATA(WA_PIQ_STUDENTLDB_SSF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PIQ_STUDENTLDB_SSF>-SSF_STD_NO = 1.
<PIQ_STUDENTLDB_SSF>-SSF_DUMMY = 1.
<PIQ_STUDENTLDB_SSF>-SSF_STD_RECIP = 1.
<PIQ_STUDENTLDB_SSF>-SSF_HOME_FLAG = 1.
<PIQ_STUDENTLDB_SSF>-SSF_CONSNUMBER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PIQ_STUDENTLDB_SSF-RFCDEST, sy-vline,
  WA_PIQ_STUDENTLDB_SSF-SSFIDSHORT, sy-vline,
  WA_PIQ_STUDENTLDB_SSF-SSF_NS, sy-vline,
  WA_PIQ_STUDENTLDB_SSF-SSF_PROF, sy-vline,
  WA_PIQ_STUDENTLDB_SSF-SSFIDPART1, sy-vline,
  WA_PIQ_STUDENTLDB_SSF-SSFIDPART2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PIQ_STUDENTLDB_SSF 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_STUDENTLDB_SSF 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_STUDENTLDB_SSF INTO WA_PIQ_STUDENTLDB_SSF.


*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_PIQ_STUDENTLDB_SSF_STR, 
SSF_STD_NO TYPE STRING,
SSF_DUMMY TYPE STRING,
SSF_STD_RECIP TYPE STRING,
SSF_HOME_FLAG TYPE STRING,
SSF_CONSNUMBER TYPE STRING,
RFCDEST TYPE STRING,
SSFIDSHORT TYPE STRING,
SSF_NS TYPE STRING,
SSF_PROF TYPE STRING,
SSFIDPART1 TYPE STRING,
SSFIDPART2 TYPE STRING,
SSFIDPART3 TYPE STRING,
SSFIDPART4 TYPE STRING,
SSFIDPART5 TYPE STRING,
SSFIDPART6 TYPE STRING,
SSFIDPART7 TYPE STRING,
SSFIDPART8 TYPE STRING,
SSFIDPART9 TYPE STRING,
SSF_ERRORFLAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PIQ_STUDENTLDB_SSF_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_STUDENTLDB_SSF_STR-SSF_STD_NO sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSF_DUMMY sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSF_STD_RECIP sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSF_HOME_FLAG sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSF_CONSNUMBER sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-RFCDEST sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDSHORT sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSF_NS sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSF_PROF sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDPART1 sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDPART2 sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDPART3 sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDPART4 sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDPART5 sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDPART6 sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDPART7 sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDPART8 sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSFIDPART9 sy-vline 
WA_PIQ_STUDENTLDB_SSF_STR-SSF_ERRORFLAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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