ABAP Select data from SAP table DB2QIST into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP DB2QIST 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 DB2QIST. 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 DB2QIST 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_DB2QIST TYPE STANDARD TABLE OF DB2QIST,
      WA_DB2QIST TYPE DB2QIST,
      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: <DB2QIST> TYPE DB2QIST.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_DB2QIST.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM DB2QIST
  INTO TABLE IT_DB2QIST.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DB2QIST
*  INTO TABLE @DATA(IT_DB2QIST2).
*--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_DB2QIST INDEX 1 INTO DATA(WA_DB2QIST2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_DB2QIST ASSIGNING <DB2QIST>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DB2QIST>-QISTRLLM = 1.
<DB2QIST>-QISTRPLM = 1.
<DB2QIST>-QISTRHIG = 1.
<DB2QIST>-QISTRCUR = 1.
<DB2QIST>-QISTRSTG = 1.

ENDLOOP.

LOOP AT IT_DB2QIST INTO WA_DB2QIST.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DB2QIST-QISTRMAX, sy-vline,
  WA_DB2QIST-QISTCOLS, sy-vline,
  WA_DB2QIST-QISTRCCI, sy-vline,
  WA_DB2QIST-QISTRCCD, sy-vline,
  WA_DB2QIST-QISTRCCU, sy-vline,
  WA_DB2QIST-QISTWFNE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DB2QIST 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_DB2QIST 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_DB2QIST INTO WA_DB2QIST.


*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_DB2QIST_STR, 
QISTRLLM TYPE STRING,
QISTRPLM TYPE STRING,
QISTRHIG TYPE STRING,
QISTRCUR TYPE STRING,
QISTRSTG TYPE STRING,
QISTRMAX TYPE STRING,
QISTCOLS TYPE STRING,
QISTRCCI TYPE STRING,
QISTRCCD TYPE STRING,
QISTRCCU TYPE STRING,
QISTWFNE TYPE STRING,
QISTWFP1 TYPE STRING,
QISTWFP2 TYPE STRING,
QISTWMXA TYPE STRING,
QISTWMXU TYPE STRING,
QISTWCTO TYPE STRING,
QISTW4K TYPE STRING,
QISTW32K TYPE STRING,
QISTIMAC TYPE STRING,
QISTIMSC TYPE STRING,
QISTIMAH TYPE STRING,
QISTIMSH TYPE STRING,
QISTSIAC TYPE STRING,
QISTSISC TYPE STRING,
QISTSIAH TYPE STRING,
QISTSISH TYPE STRING,
QISTWFRHIG TYPE STRING,
QISTWFRCUR TYPE STRING,
QISTI2AC TYPE STRING,
QISTI2AH TYPE STRING,
QISTI2OF TYPE STRING,
QISTIMNC TYPE STRING,
QISTASTH TYPE STRING,
QISTSSTH TYPE STRING,
QISTAMXU TYPE STRING,
QISTWSTG TYPE STRING,
QISTDGTTSTG TYPE STRING,
QISTDGTTCTO TYPE STRING,
QISTDGTTMXU TYPE STRING,
QISTWFSTG TYPE STRING,
QISTWFCTO TYPE STRING,
QISTWFMXU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DB2QIST_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_DB2QIST_STR-QISTRLLM sy-vline 
WA_DB2QIST_STR-QISTRPLM sy-vline 
WA_DB2QIST_STR-QISTRHIG sy-vline 
WA_DB2QIST_STR-QISTRCUR sy-vline 
WA_DB2QIST_STR-QISTRSTG sy-vline 
WA_DB2QIST_STR-QISTRMAX sy-vline 
WA_DB2QIST_STR-QISTCOLS sy-vline 
WA_DB2QIST_STR-QISTRCCI sy-vline 
WA_DB2QIST_STR-QISTRCCD sy-vline 
WA_DB2QIST_STR-QISTRCCU sy-vline 
WA_DB2QIST_STR-QISTWFNE sy-vline 
WA_DB2QIST_STR-QISTWFP1 sy-vline 
WA_DB2QIST_STR-QISTWFP2 sy-vline 
WA_DB2QIST_STR-QISTWMXA sy-vline 
WA_DB2QIST_STR-QISTWMXU sy-vline 
WA_DB2QIST_STR-QISTWCTO sy-vline 
WA_DB2QIST_STR-QISTW4K sy-vline 
WA_DB2QIST_STR-QISTW32K sy-vline 
WA_DB2QIST_STR-QISTIMAC sy-vline 
WA_DB2QIST_STR-QISTIMSC sy-vline 
WA_DB2QIST_STR-QISTIMAH sy-vline 
WA_DB2QIST_STR-QISTIMSH sy-vline 
WA_DB2QIST_STR-QISTSIAC sy-vline 
WA_DB2QIST_STR-QISTSISC sy-vline 
WA_DB2QIST_STR-QISTSIAH sy-vline 
WA_DB2QIST_STR-QISTSISH sy-vline 
WA_DB2QIST_STR-QISTWFRHIG sy-vline 
WA_DB2QIST_STR-QISTWFRCUR sy-vline 
WA_DB2QIST_STR-QISTI2AC sy-vline 
WA_DB2QIST_STR-QISTI2AH sy-vline 
WA_DB2QIST_STR-QISTI2OF sy-vline 
WA_DB2QIST_STR-QISTIMNC sy-vline 
WA_DB2QIST_STR-QISTASTH sy-vline 
WA_DB2QIST_STR-QISTSSTH sy-vline 
WA_DB2QIST_STR-QISTAMXU sy-vline 
WA_DB2QIST_STR-QISTWSTG sy-vline 
WA_DB2QIST_STR-QISTDGTTSTG sy-vline 
WA_DB2QIST_STR-QISTDGTTCTO sy-vline 
WA_DB2QIST_STR-QISTDGTTMXU sy-vline 
WA_DB2QIST_STR-QISTWFSTG sy-vline 
WA_DB2QIST_STR-QISTWFCTO sy-vline 
WA_DB2QIST_STR-QISTWFMXU sy-vline      INTO ld_text SEPARATED BY SPACE.

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