ABAP Select data from SAP table PMAINTORDER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PMAINTORDER
*  INTO TABLE @DATA(IT_PMAINTORDER2).
*--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_PMAINTORDER INDEX 1 INTO DATA(WA_PMAINTORDER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PMAINTORDER>-MANDT = 1.
<PMAINTORDER>-MAINTENANCEORDER = 1.
<PMAINTORDER>-ORDERDESCRIPTION = 1.
<PMAINTORDER>-MAINTENANCEORDERINTERNALID = 1.
<PMAINTORDER>-MAINTENANCEORDERCATEGORY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PMAINTORDER-WBSELEMENTOBJECT, sy-vline,
  WA_PMAINTORDER-WBSELEMENTINTERNALID, sy-vline,
  WA_PMAINTORDER-PROJECT, sy-vline,
  WA_PMAINTORDER-PROJECTINTERNALID, sy-vline,
  WA_PMAINTORDER-PROJECTOBJECT, sy-vline,
  WA_PMAINTORDER-COMPANYCODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PMAINTORDER 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_PMAINTORDER 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_PMAINTORDER INTO WA_PMAINTORDER.


*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 ALPHA, internal->external for field MAINTENANCEORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PMAINTORDER-MAINTENANCEORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PMAINTORDER-MAINTENANCEORDER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field PROJECT
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_PMAINTORDER-PROJECT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PMAINTORDER-PROJECT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PROFITCENTER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PMAINTORDER-PROFITCENTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PMAINTORDER-PROFITCENTER.
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_PMAINTORDER_STR, 
MANDT TYPE STRING,
MAINTENANCEORDER TYPE STRING,
ORDERDESCRIPTION TYPE STRING,
MAINTENANCEORDERINTERNALID TYPE STRING,
MAINTENANCEORDERCATEGORY TYPE STRING,
WBSELEMENTOBJECT TYPE STRING,
WBSELEMENTINTERNALID TYPE STRING,
PROJECT TYPE STRING,
PROJECTINTERNALID TYPE STRING,
PROJECTOBJECT TYPE STRING,
COMPANYCODE TYPE STRING,
PROFITCENTER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PMAINTORDER_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_PMAINTORDER_STR-MANDT sy-vline 
WA_PMAINTORDER_STR-MAINTENANCEORDER sy-vline 
WA_PMAINTORDER_STR-ORDERDESCRIPTION sy-vline 
WA_PMAINTORDER_STR-MAINTENANCEORDERINTERNALID sy-vline 
WA_PMAINTORDER_STR-MAINTENANCEORDERCATEGORY sy-vline 
WA_PMAINTORDER_STR-WBSELEMENTOBJECT sy-vline 
WA_PMAINTORDER_STR-WBSELEMENTINTERNALID sy-vline 
WA_PMAINTORDER_STR-PROJECT sy-vline 
WA_PMAINTORDER_STR-PROJECTINTERNALID sy-vline 
WA_PMAINTORDER_STR-PROJECTOBJECT sy-vline 
WA_PMAINTORDER_STR-COMPANYCODE sy-vline 
WA_PMAINTORDER_STR-PROFITCENTER sy-vline      INTO ld_text SEPARATED BY SPACE.

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