ABAP Select data from SAP table SAPWLNSUM into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP SAPWLNSUM 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 SAPWLNSUM. 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 SAPWLNSUM 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_SAPWLNSUM TYPE STANDARD TABLE OF SAPWLNSUM,
      WA_SAPWLNSUM TYPE SAPWLNSUM,
      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: <SAPWLNSUM> TYPE SAPWLNSUM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SAPWLNSUM
*  INTO TABLE @DATA(IT_SAPWLNSUM2).
*--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_SAPWLNSUM INDEX 1 INTO DATA(WA_SAPWLNSUM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SAPWLNSUM>-SERVICE = 1.
<SAPWLNSUM>-TEXT = 1.
<SAPWLNSUM>-LONGTEXT = 1.
<SAPWLNSUM>-STEPCNT = 1.
<SAPWLNSUM>-LUWCNT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SAPWLNSUM-RESPTI, sy-vline,
  WA_SAPWLNSUM-RESPTIMT, sy-vline,
  WA_SAPWLNSUM-RESPTIMTA, sy-vline,
  WA_SAPWLNSUM-CPUTI, sy-vline,
  WA_SAPWLNSUM-CPUTIP, sy-vline,
  WA_SAPWLNSUM-CPUTIMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SAPWLNSUM 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_SAPWLNSUM 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_SAPWLNSUM INTO WA_SAPWLNSUM.


*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_SAPWLNSUM_STR, 
SERVICE TYPE STRING,
TEXT TYPE STRING,
LONGTEXT TYPE STRING,
STEPCNT TYPE STRING,
LUWCNT TYPE STRING,
RESPTI TYPE STRING,
RESPTIMT TYPE STRING,
RESPTIMTA TYPE STRING,
CPUTI TYPE STRING,
CPUTIP TYPE STRING,
CPUTIMT TYPE STRING,
CPUTIMTA TYPE STRING,
QUEUETI TYPE STRING,
QUEUETIP TYPE STRING,
QUEUETIMT TYPE STRING,
QUEUETIMTA TYPE STRING,
WAITTI TYPE STRING,
WAITTIP TYPE STRING,
WAITTIMT TYPE STRING,
WAITTIMTA TYPE STRING,
LOADTI TYPE STRING,
LOADTIP TYPE STRING,
LOADTIMT TYPE STRING,
LOADTIMTA TYPE STRING,
GENTI TYPE STRING,
GENTIP TYPE STRING,
GENTIMT TYPE STRING,
GENTIMTA TYPE STRING,
NETTI TYPE STRING,
NETTIMT TYPE STRING,
NETTIMTA TYPE STRING,
MAXMEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SAPWLNSUM_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_SAPWLNSUM_STR-SERVICE sy-vline 
WA_SAPWLNSUM_STR-TEXT sy-vline 
WA_SAPWLNSUM_STR-LONGTEXT sy-vline 
WA_SAPWLNSUM_STR-STEPCNT sy-vline 
WA_SAPWLNSUM_STR-LUWCNT sy-vline 
WA_SAPWLNSUM_STR-RESPTI sy-vline 
WA_SAPWLNSUM_STR-RESPTIMT sy-vline 
WA_SAPWLNSUM_STR-RESPTIMTA sy-vline 
WA_SAPWLNSUM_STR-CPUTI sy-vline 
WA_SAPWLNSUM_STR-CPUTIP sy-vline 
WA_SAPWLNSUM_STR-CPUTIMT sy-vline 
WA_SAPWLNSUM_STR-CPUTIMTA sy-vline 
WA_SAPWLNSUM_STR-QUEUETI sy-vline 
WA_SAPWLNSUM_STR-QUEUETIP sy-vline 
WA_SAPWLNSUM_STR-QUEUETIMT sy-vline 
WA_SAPWLNSUM_STR-QUEUETIMTA sy-vline 
WA_SAPWLNSUM_STR-WAITTI sy-vline 
WA_SAPWLNSUM_STR-WAITTIP sy-vline 
WA_SAPWLNSUM_STR-WAITTIMT sy-vline 
WA_SAPWLNSUM_STR-WAITTIMTA sy-vline 
WA_SAPWLNSUM_STR-LOADTI sy-vline 
WA_SAPWLNSUM_STR-LOADTIP sy-vline 
WA_SAPWLNSUM_STR-LOADTIMT sy-vline 
WA_SAPWLNSUM_STR-LOADTIMTA sy-vline 
WA_SAPWLNSUM_STR-GENTI sy-vline 
WA_SAPWLNSUM_STR-GENTIP sy-vline 
WA_SAPWLNSUM_STR-GENTIMT sy-vline 
WA_SAPWLNSUM_STR-GENTIMTA sy-vline 
WA_SAPWLNSUM_STR-NETTI sy-vline 
WA_SAPWLNSUM_STR-NETTIMT sy-vline 
WA_SAPWLNSUM_STR-NETTIMTA sy-vline 
WA_SAPWLNSUM_STR-MAXMEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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