ABAP Select data from SAP table PMQ20 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 PMQ20 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 PMQ20. 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 PMQ20 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_PMQ20 TYPE STANDARD TABLE OF PMQ20,
      WA_PMQ20 TYPE PMQ20,
      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: <PMQ20> TYPE PMQ20.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PMQ20.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PMQ20
  INTO TABLE IT_PMQ20.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PMQ20
*  INTO TABLE @DATA(IT_PMQ202).
*--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_PMQ20 INDEX 1 INTO DATA(WA_PMQ202).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PMQ20 ASSIGNING <PMQ20>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PMQ20>-THEAD = 1.
<PMQ20>-OVONI = 1.
<PMQ20>-OBISI = 1.
<PMQ20>-PNUM = 1.
<PMQ20>-TOTAL = 1.

ENDLOOP.

LOOP AT IT_PMQ20 INTO WA_PMQ20.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PMQ20-THEA2, sy-vline,
  WA_PMQ20-SLASH, sy-vline,
  WA_PMQ20-THEA3, sy-vline,
  WA_PMQ20-QTYPE, sy-vline,
  WA_PMQ20-QUALI, sy-vline,
  WA_PMQ20-QTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PMQ20 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_PMQ20 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_PMQ20 INTO WA_PMQ20.


*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_PMQ20_STR, 
THEAD TYPE STRING,
OVONI TYPE STRING,
OBISI TYPE STRING,
PNUM TYPE STRING,
TOTAL TYPE STRING,
THEA2 TYPE STRING,
SLASH TYPE STRING,
THEA3 TYPE STRING,
QTYPE TYPE STRING,
QUALI TYPE STRING,
QTEXT TYPE STRING,
PNUM3 TYPE STRING,
TOTA3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PMQ20_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_PMQ20_STR-THEAD sy-vline 
WA_PMQ20_STR-OVONI sy-vline 
WA_PMQ20_STR-OBISI sy-vline 
WA_PMQ20_STR-PNUM sy-vline 
WA_PMQ20_STR-TOTAL sy-vline 
WA_PMQ20_STR-THEA2 sy-vline 
WA_PMQ20_STR-SLASH sy-vline 
WA_PMQ20_STR-THEA3 sy-vline 
WA_PMQ20_STR-QTYPE sy-vline 
WA_PMQ20_STR-QUALI sy-vline 
WA_PMQ20_STR-QTEXT sy-vline 
WA_PMQ20_STR-PNUM3 sy-vline 
WA_PMQ20_STR-TOTA3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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