ABAP Select data from SAP table SAPWLEXSYS 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 SAPWLEXSYS 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 SAPWLEXSYS. 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 SAPWLEXSYS 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_SAPWLEXSYS TYPE STANDARD TABLE OF SAPWLEXSYS,
      WA_SAPWLEXSYS TYPE SAPWLEXSYS,
      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: <SAPWLEXSYS> TYPE SAPWLEXSYS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SAPWLEXSYS
*  INTO TABLE @DATA(IT_SAPWLEXSYS2).
*--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_SAPWLEXSYS INDEX 1 INTO DATA(WA_SAPWLEXSYS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SAPWLEXSYS>-SYSTEMID = 1.
<SAPWLEXSYS>-ACTION = 1.
<SAPWLEXSYS>-USERID = 1.
<SAPWLEXSYS>-SERVTYP = 1.
<SAPWLEXSYS>-ACTTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SAPWLEXSYS-TTYPE, sy-vline,
  WA_SAPWLEXSYS-DIASTEPCNT, sy-vline,
  WA_SAPWLEXSYS-LUWCNT, sy-vline,
  WA_SAPWLEXSYS-PROCTI, sy-vline,
  WA_SAPWLEXSYS-PROCMT, sy-vline,
  WA_SAPWLEXSYS-RESPST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SAPWLEXSYS 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_SAPWLEXSYS 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_SAPWLEXSYS INTO WA_SAPWLEXSYS.


*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_SAPWLEXSYS_STR, 
SYSTEMID TYPE STRING,
ACTION TYPE STRING,
USERID TYPE STRING,
SERVTYP TYPE STRING,
ACTTYPE TYPE STRING,
TTYPE TYPE STRING,
DIASTEPCNT TYPE STRING,
LUWCNT TYPE STRING,
PROCTI TYPE STRING,
PROCMT TYPE STRING,
RESPST TYPE STRING,
RESPMT TYPE STRING,
RESPMTA TYPE STRING,
ROLLWAITTI TYPE STRING,
ROLLWAITMT TYPE STRING,
CPUST TYPE STRING,
CPUMT TYPE STRING,
CPUMTA TYPE STRING,
DBST TYPE STRING,
DBMT TYPE STRING,
DBMTA TYPE STRING,
DBPRMT TYPE STRING,
WAITST TYPE STRING,
WAITMT TYPE STRING,
WAITMTA TYPE STRING,
READSEQCNT TYPE STRING,
READSEQST TYPE STRING,
READSEQMT TYPE STRING,
READSEQREC TYPE STRING,
READDIRCNT TYPE STRING,
READDIRST TYPE STRING,
READDIRMT TYPE STRING,
READDIRREC TYPE STRING,
READSEQBUF TYPE STRING,
CHNGCNT TYPE STRING,
CHNGST TYPE STRING,
CHNGMT TYPE STRING,
CHNGREC TYPE STRING,
DBREQUCNT TYPE STRING,
DBREQMTI TYPE STRING,
PHYREADCNT TYPE STRING,
PHYCHNGREC TYPE STRING,
PHYDBCALLS TYPE STRING,
DBUFREADCN TYPE STRING,
DBPCOUNT TYPE STRING,
DBPTIME TYPE STRING,
DBPAVTI TYPE STRING,
MCPUTI TYPE STRING,
MDBTI TYPE STRING,
MDBPRTI TYPE STRING,
MWAITTI TYPE STRING,
MFGUITI TYPE STRING,
FNETST TYPE STRING,
FGUIST TYPE STRING,
FGUICNT TYPE STRING,
FNETMT TYPE STRING,
FGUIMT TYPE STRING,
FGUITRPMT TYPE STRING,
BYTES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SAPWLEXSYS_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_SAPWLEXSYS_STR-SYSTEMID sy-vline 
WA_SAPWLEXSYS_STR-ACTION sy-vline 
WA_SAPWLEXSYS_STR-USERID sy-vline 
WA_SAPWLEXSYS_STR-SERVTYP sy-vline 
WA_SAPWLEXSYS_STR-ACTTYPE sy-vline 
WA_SAPWLEXSYS_STR-TTYPE sy-vline 
WA_SAPWLEXSYS_STR-DIASTEPCNT sy-vline 
WA_SAPWLEXSYS_STR-LUWCNT sy-vline 
WA_SAPWLEXSYS_STR-PROCTI sy-vline 
WA_SAPWLEXSYS_STR-PROCMT sy-vline 
WA_SAPWLEXSYS_STR-RESPST sy-vline 
WA_SAPWLEXSYS_STR-RESPMT sy-vline 
WA_SAPWLEXSYS_STR-RESPMTA sy-vline 
WA_SAPWLEXSYS_STR-ROLLWAITTI sy-vline 
WA_SAPWLEXSYS_STR-ROLLWAITMT sy-vline 
WA_SAPWLEXSYS_STR-CPUST sy-vline 
WA_SAPWLEXSYS_STR-CPUMT sy-vline 
WA_SAPWLEXSYS_STR-CPUMTA sy-vline 
WA_SAPWLEXSYS_STR-DBST sy-vline 
WA_SAPWLEXSYS_STR-DBMT sy-vline 
WA_SAPWLEXSYS_STR-DBMTA sy-vline 
WA_SAPWLEXSYS_STR-DBPRMT sy-vline 
WA_SAPWLEXSYS_STR-WAITST sy-vline 
WA_SAPWLEXSYS_STR-WAITMT sy-vline 
WA_SAPWLEXSYS_STR-WAITMTA sy-vline 
WA_SAPWLEXSYS_STR-READSEQCNT sy-vline 
WA_SAPWLEXSYS_STR-READSEQST sy-vline 
WA_SAPWLEXSYS_STR-READSEQMT sy-vline 
WA_SAPWLEXSYS_STR-READSEQREC sy-vline 
WA_SAPWLEXSYS_STR-READDIRCNT sy-vline 
WA_SAPWLEXSYS_STR-READDIRST sy-vline 
WA_SAPWLEXSYS_STR-READDIRMT sy-vline 
WA_SAPWLEXSYS_STR-READDIRREC sy-vline 
WA_SAPWLEXSYS_STR-READSEQBUF sy-vline 
WA_SAPWLEXSYS_STR-CHNGCNT sy-vline 
WA_SAPWLEXSYS_STR-CHNGST sy-vline 
WA_SAPWLEXSYS_STR-CHNGMT sy-vline 
WA_SAPWLEXSYS_STR-CHNGREC sy-vline 
WA_SAPWLEXSYS_STR-DBREQUCNT sy-vline 
WA_SAPWLEXSYS_STR-DBREQMTI sy-vline 
WA_SAPWLEXSYS_STR-PHYREADCNT sy-vline 
WA_SAPWLEXSYS_STR-PHYCHNGREC sy-vline 
WA_SAPWLEXSYS_STR-PHYDBCALLS sy-vline 
WA_SAPWLEXSYS_STR-DBUFREADCN sy-vline 
WA_SAPWLEXSYS_STR-DBPCOUNT sy-vline 
WA_SAPWLEXSYS_STR-DBPTIME sy-vline 
WA_SAPWLEXSYS_STR-DBPAVTI sy-vline 
WA_SAPWLEXSYS_STR-MCPUTI sy-vline 
WA_SAPWLEXSYS_STR-MDBTI sy-vline 
WA_SAPWLEXSYS_STR-MDBPRTI sy-vline 
WA_SAPWLEXSYS_STR-MWAITTI sy-vline 
WA_SAPWLEXSYS_STR-MFGUITI sy-vline 
WA_SAPWLEXSYS_STR-FNETST sy-vline 
WA_SAPWLEXSYS_STR-FGUIST sy-vline 
WA_SAPWLEXSYS_STR-FGUICNT sy-vline 
WA_SAPWLEXSYS_STR-FNETMT sy-vline 
WA_SAPWLEXSYS_STR-FGUIMT sy-vline 
WA_SAPWLEXSYS_STR-FGUITRPMT sy-vline 
WA_SAPWLEXSYS_STR-BYTES sy-vline      INTO ld_text SEPARATED BY SPACE.

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