ABAP Select data from SAP table MLTTSTLOGP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLTTSTLOGP
*  INTO TABLE @DATA(IT_MLTTSTLOGP2).
*--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_MLTTSTLOGP INDEX 1 INTO DATA(WA_MLTTSTLOGP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLTTSTLOGP>-SYSID = 1.
<MLTTSTLOGP>-SPRAS = 1.
<MLTTSTLOGP>-TESTDATE = 1.
<MLTTSTLOGP>-ASPECT = 1.
<MLTTSTLOGP>-BEGTIME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLTTSTLOGP-ENDTIME, sy-vline,
  WA_MLTTSTLOGP-UNAME, sy-vline,
  WA_MLTTSTLOGP-NBRDBCALLS, sy-vline,
  WA_MLTTSTLOGP-NBRDBROWS, sy-vline,
  WA_MLTTSTLOGP-MEMUSAGE, sy-vline,
  WA_MLTTSTLOGP-CPUTIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLTTSTLOGP 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_MLTTSTLOGP 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_MLTTSTLOGP INTO WA_MLTTSTLOGP.


*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.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MLTTSTLOGP-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MLTTSTLOGP-SPRAS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MLTTSTLOGP_STR, 
SYSID TYPE STRING,
SPRAS TYPE STRING,
TESTDATE TYPE STRING,
ASPECT TYPE STRING,
BEGTIME TYPE STRING,
ENDTIME TYPE STRING,
UNAME TYPE STRING,
NBRDBCALLS TYPE STRING,
NBRDBROWS TYPE STRING,
MEMUSAGE TYPE STRING,
CPUTIME TYPE STRING,
TERMIO TYPE STRING,
NBRROUNDTRIPS TYPE STRING,
OTHERCOUNT TYPE STRING,
FLAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLTTSTLOGP_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_MLTTSTLOGP_STR-SYSID sy-vline 
WA_MLTTSTLOGP_STR-SPRAS sy-vline 
WA_MLTTSTLOGP_STR-TESTDATE sy-vline 
WA_MLTTSTLOGP_STR-ASPECT sy-vline 
WA_MLTTSTLOGP_STR-BEGTIME sy-vline 
WA_MLTTSTLOGP_STR-ENDTIME sy-vline 
WA_MLTTSTLOGP_STR-UNAME sy-vline 
WA_MLTTSTLOGP_STR-NBRDBCALLS sy-vline 
WA_MLTTSTLOGP_STR-NBRDBROWS sy-vline 
WA_MLTTSTLOGP_STR-MEMUSAGE sy-vline 
WA_MLTTSTLOGP_STR-CPUTIME sy-vline 
WA_MLTTSTLOGP_STR-TERMIO sy-vline 
WA_MLTTSTLOGP_STR-NBRROUNDTRIPS sy-vline 
WA_MLTTSTLOGP_STR-OTHERCOUNT sy-vline 
WA_MLTTSTLOGP_STR-FLAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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