ABAP Select data from SAP table PMX18 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PMX18 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 PMX18. 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 PMX18 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_PMX18 TYPE STANDARD TABLE OF PMX18,
      WA_PMX18 TYPE PMX18,
      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: <PMX18> TYPE PMX18.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PMX18.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PMX18
  INTO TABLE IT_PMX18.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PMX18
*  INTO TABLE @DATA(IT_PMX182).
*--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_PMX18 INDEX 1 INTO DATA(WA_PMX182).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PMX18 ASSIGNING <PMX18>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PMX18>-HELAB = 1.
<PMX18>-NIMSS = 1.
<PMX18>-ITTRAB = 1.
<PMX18>-APATER = 1.
<PMX18>-AMATER = 1.

ENDLOOP.

LOOP AT IT_PMX18 INTO WA_PMX18.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PMX18-NOMBRE, sy-vline,
  WA_PMX18-CURP, sy-vline,
  WA_PMX18-PERNO, sy-vline,
  WA_PMX18-UMEDI, sy-vline,
  WA_PMX18-JORED, sy-vline,
  WA_PMX18-TIPOSAL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PMX18 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_PMX18 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_PMX18 INTO WA_PMX18.


*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_PMX18_STR, 
HELAB TYPE STRING,
NIMSS TYPE STRING,
ITTRAB TYPE STRING,
APATER TYPE STRING,
AMATER TYPE STRING,
NOMBRE TYPE STRING,
CURP TYPE STRING,
PERNO TYPE STRING,
UMEDI TYPE STRING,
JORED TYPE STRING,
TIPOSAL TYPE STRING,
FECHA TYPE STRING,
SDI TYPE STRING,
TIPOBAJA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PMX18_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_PMX18_STR-HELAB sy-vline 
WA_PMX18_STR-NIMSS sy-vline 
WA_PMX18_STR-ITTRAB sy-vline 
WA_PMX18_STR-APATER sy-vline 
WA_PMX18_STR-AMATER sy-vline 
WA_PMX18_STR-NOMBRE sy-vline 
WA_PMX18_STR-CURP sy-vline 
WA_PMX18_STR-PERNO sy-vline 
WA_PMX18_STR-UMEDI sy-vline 
WA_PMX18_STR-JORED sy-vline 
WA_PMX18_STR-TIPOSAL sy-vline 
WA_PMX18_STR-FECHA sy-vline 
WA_PMX18_STR-SDI sy-vline 
WA_PMX18_STR-TIPOBAJA sy-vline      INTO ld_text SEPARATED BY SPACE.

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