ABAP Select data from SAP table SAPWLAPPB2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP SAPWLAPPB2 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 SAPWLAPPB2. 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 SAPWLAPPB2 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_SAPWLAPPB2 TYPE STANDARD TABLE OF SAPWLAPPB2,
      WA_SAPWLAPPB2 TYPE SAPWLAPPB2,
      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: <SAPWLAPPB2> TYPE SAPWLAPPB2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_SAPWLAPPB2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM SAPWLAPPB2
  INTO TABLE IT_SAPWLAPPB2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SAPWLAPPB2
*  INTO TABLE @DATA(IT_SAPWLAPPB22).
*--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_SAPWLAPPB2 INDEX 1 INTO DATA(WA_SAPWLAPPB22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_SAPWLAPPB2 ASSIGNING <SAPWLAPPB2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SAPWLAPPB2>-TCODE = 1.
<SAPWLAPPB2>-INITKEY = 1.
<SAPWLAPPB2>-ACCOUNT = 1.
<SAPWLAPPB2>-TEXT = 1.
<SAPWLAPPB2>-TECHTEXT = 1.

ENDLOOP.

LOOP AT IT_SAPWLAPPB2 INTO WA_SAPWLAPPB2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SAPWLAPPB2-OPENKEY, sy-vline,
  WA_SAPWLAPPB2-DIASTEPCNT, sy-vline,
  WA_SAPWLAPPB2-RESPST, sy-vline,
  WA_SAPWLAPPB2-RESPMT, sy-vline,
  WA_SAPWLAPPB2-CPUST, sy-vline,
  WA_SAPWLAPPB2-CPUMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SAPWLAPPB2 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_SAPWLAPPB2 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_SAPWLAPPB2 INTO WA_SAPWLAPPB2.


*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_SAPWLAPPB2_STR, 
TCODE TYPE STRING,
INITKEY TYPE STRING,
ACCOUNT TYPE STRING,
TEXT TYPE STRING,
TECHTEXT TYPE STRING,
OPENKEY TYPE STRING,
DIASTEPCNT TYPE STRING,
RESPST TYPE STRING,
RESPMT TYPE STRING,
CPUST TYPE STRING,
CPUMT TYPE STRING,
PROCST TYPE STRING,
PROCMT TYPE STRING,
DBST TYPE STRING,
DBMT TYPE STRING,
DBPRMT TYPE STRING,
WAITMT 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,
DBPMTI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SAPWLAPPB2_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_SAPWLAPPB2_STR-TCODE sy-vline 
WA_SAPWLAPPB2_STR-INITKEY sy-vline 
WA_SAPWLAPPB2_STR-ACCOUNT sy-vline 
WA_SAPWLAPPB2_STR-TEXT sy-vline 
WA_SAPWLAPPB2_STR-TECHTEXT sy-vline 
WA_SAPWLAPPB2_STR-OPENKEY sy-vline 
WA_SAPWLAPPB2_STR-DIASTEPCNT sy-vline 
WA_SAPWLAPPB2_STR-RESPST sy-vline 
WA_SAPWLAPPB2_STR-RESPMT sy-vline 
WA_SAPWLAPPB2_STR-CPUST sy-vline 
WA_SAPWLAPPB2_STR-CPUMT sy-vline 
WA_SAPWLAPPB2_STR-PROCST sy-vline 
WA_SAPWLAPPB2_STR-PROCMT sy-vline 
WA_SAPWLAPPB2_STR-DBST sy-vline 
WA_SAPWLAPPB2_STR-DBMT sy-vline 
WA_SAPWLAPPB2_STR-DBPRMT sy-vline 
WA_SAPWLAPPB2_STR-WAITMT sy-vline 
WA_SAPWLAPPB2_STR-READSEQCNT sy-vline 
WA_SAPWLAPPB2_STR-READSEQST sy-vline 
WA_SAPWLAPPB2_STR-READSEQMT sy-vline 
WA_SAPWLAPPB2_STR-READSEQREC sy-vline 
WA_SAPWLAPPB2_STR-READDIRCNT sy-vline 
WA_SAPWLAPPB2_STR-READDIRST sy-vline 
WA_SAPWLAPPB2_STR-READDIRMT sy-vline 
WA_SAPWLAPPB2_STR-READDIRREC sy-vline 
WA_SAPWLAPPB2_STR-READSEQBUF sy-vline 
WA_SAPWLAPPB2_STR-CHNGCNT sy-vline 
WA_SAPWLAPPB2_STR-CHNGST sy-vline 
WA_SAPWLAPPB2_STR-CHNGMT sy-vline 
WA_SAPWLAPPB2_STR-CHNGREC sy-vline 
WA_SAPWLAPPB2_STR-DBREQUCNT sy-vline 
WA_SAPWLAPPB2_STR-DBREQMTI sy-vline 
WA_SAPWLAPPB2_STR-PHYREADCNT sy-vline 
WA_SAPWLAPPB2_STR-PHYCHNGREC sy-vline 
WA_SAPWLAPPB2_STR-PHYDBCALLS sy-vline 
WA_SAPWLAPPB2_STR-DBUFREADCN sy-vline 
WA_SAPWLAPPB2_STR-DBPCOUNT sy-vline 
WA_SAPWLAPPB2_STR-DBPTIME sy-vline 
WA_SAPWLAPPB2_STR-DBPMTI sy-vline      INTO ld_text SEPARATED BY SPACE.

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