ABAP Select data from SAP table SAPWLNEXT 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 SAPWLNEXT 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 SAPWLNEXT. 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 SAPWLNEXT 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_SAPWLNEXT TYPE STANDARD TABLE OF SAPWLNEXT,
      WA_SAPWLNEXT TYPE SAPWLNEXT,
      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: <SAPWLNEXT> TYPE SAPWLNEXT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SAPWLNEXT
*  INTO TABLE @DATA(IT_SAPWLNEXT2).
*--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_SAPWLNEXT INDEX 1 INTO DATA(WA_SAPWLNEXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SAPWLNEXT>-I_SYSTEM = 1.
<SAPWLNEXT>-I_ACTION = 1.
<SAPWLNEXT>-I_ACTTYP = 1.
<SAPWLNEXT>-I_ACTSHORT = 1.
<SAPWLNEXT>-I_ACTLONG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SAPWLNEXT-I_SERVICE, sy-vline,
  WA_SAPWLNEXT-I_USER, sy-vline,
  WA_SAPWLNEXT-SERVICE, sy-vline,
  WA_SAPWLNEXT-STEPCNT, sy-vline,
  WA_SAPWLNEXT-LUWCNT, sy-vline,
  WA_SAPWLNEXT-RESPTI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SAPWLNEXT 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_SAPWLNEXT 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_SAPWLNEXT INTO WA_SAPWLNEXT.


*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_SAPWLNEXT_STR, 
I_SYSTEM TYPE STRING,
I_ACTION TYPE STRING,
I_ACTTYP TYPE STRING,
I_ACTSHORT TYPE STRING,
I_ACTLONG TYPE STRING,
I_SERVICE TYPE STRING,
I_USER TYPE STRING,
SERVICE TYPE STRING,
STEPCNT TYPE STRING,
LUWCNT TYPE STRING,
RESPTI TYPE STRING,
RESPMT TYPE STRING,
RESPMTA TYPE STRING,
CPUTI TYPE STRING,
CPUTIP TYPE STRING,
CPUMT TYPE STRING,
CPUMTA TYPE STRING,
QUEUTI TYPE STRING,
QUEUTIP TYPE STRING,
QUEUMT TYPE STRING,
QUEUMTA TYPE STRING,
WAITTI TYPE STRING,
WAITTIP TYPE STRING,
WAITMT TYPE STRING,
WAITMTA TYPE STRING,
LOADTI TYPE STRING,
LOADTIP TYPE STRING,
LOADMT TYPE STRING,
LOADMTA TYPE STRING,
GENTI TYPE STRING,
GENTIP TYPE STRING,
GENMT TYPE STRING,
GENMTA TYPE STRING,
NETTI TYPE STRING,
NETMT TYPE STRING,
NETMTA TYPE STRING,
MAXMEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SAPWLNEXT_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_SAPWLNEXT_STR-I_SYSTEM sy-vline 
WA_SAPWLNEXT_STR-I_ACTION sy-vline 
WA_SAPWLNEXT_STR-I_ACTTYP sy-vline 
WA_SAPWLNEXT_STR-I_ACTSHORT sy-vline 
WA_SAPWLNEXT_STR-I_ACTLONG sy-vline 
WA_SAPWLNEXT_STR-I_SERVICE sy-vline 
WA_SAPWLNEXT_STR-I_USER sy-vline 
WA_SAPWLNEXT_STR-SERVICE sy-vline 
WA_SAPWLNEXT_STR-STEPCNT sy-vline 
WA_SAPWLNEXT_STR-LUWCNT sy-vline 
WA_SAPWLNEXT_STR-RESPTI sy-vline 
WA_SAPWLNEXT_STR-RESPMT sy-vline 
WA_SAPWLNEXT_STR-RESPMTA sy-vline 
WA_SAPWLNEXT_STR-CPUTI sy-vline 
WA_SAPWLNEXT_STR-CPUTIP sy-vline 
WA_SAPWLNEXT_STR-CPUMT sy-vline 
WA_SAPWLNEXT_STR-CPUMTA sy-vline 
WA_SAPWLNEXT_STR-QUEUTI sy-vline 
WA_SAPWLNEXT_STR-QUEUTIP sy-vline 
WA_SAPWLNEXT_STR-QUEUMT sy-vline 
WA_SAPWLNEXT_STR-QUEUMTA sy-vline 
WA_SAPWLNEXT_STR-WAITTI sy-vline 
WA_SAPWLNEXT_STR-WAITTIP sy-vline 
WA_SAPWLNEXT_STR-WAITMT sy-vline 
WA_SAPWLNEXT_STR-WAITMTA sy-vline 
WA_SAPWLNEXT_STR-LOADTI sy-vline 
WA_SAPWLNEXT_STR-LOADTIP sy-vline 
WA_SAPWLNEXT_STR-LOADMT sy-vline 
WA_SAPWLNEXT_STR-LOADMTA sy-vline 
WA_SAPWLNEXT_STR-GENTI sy-vline 
WA_SAPWLNEXT_STR-GENTIP sy-vline 
WA_SAPWLNEXT_STR-GENMT sy-vline 
WA_SAPWLNEXT_STR-GENMTA sy-vline 
WA_SAPWLNEXT_STR-NETTI sy-vline 
WA_SAPWLNEXT_STR-NETMT sy-vline 
WA_SAPWLNEXT_STR-NETMTA sy-vline 
WA_SAPWLNEXT_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.