ABAP Select data from SAP table ML4H_S_STRG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP ML4H_S_STRG 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 ML4H_S_STRG. 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 ML4H_S_STRG 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_ML4H_S_STRG TYPE STANDARD TABLE OF ML4H_S_STRG,
      WA_ML4H_S_STRG TYPE ML4H_S_STRG,
      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: <ML4H_S_STRG> TYPE ML4H_S_STRG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_ML4H_S_STRG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM ML4H_S_STRG
  INTO TABLE IT_ML4H_S_STRG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ML4H_S_STRG
*  INTO TABLE @DATA(IT_ML4H_S_STRG2).
*--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_ML4H_S_STRG INDEX 1 INTO DATA(WA_ML4H_S_STRG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_ML4H_S_STRG ASSIGNING <ML4H_S_STRG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ML4H_S_STRG>-RUNREF = 1.
<ML4H_S_STRG>-RUN_ID = 1.
<ML4H_S_STRG>-JAHRPER = 1.
<ML4H_S_STRG>-FROM_JAHRPER = 1.
<ML4H_S_STRG>-UNTPER = 1.

ENDLOOP.

LOOP AT IT_ML4H_S_STRG INTO WA_ML4H_S_STRG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ML4H_S_STRG-APPL, sy-vline,
  WA_ML4H_S_STRG-OTYPE, sy-vline,
  WA_ML4H_S_STRG-LAST_DAY, sy-vline,
  WA_ML4H_S_STRG-FIRST_DAY, sy-vline,
  WA_ML4H_S_STRG-CURTP_10, sy-vline,
  WA_ML4H_S_STRG-TRANSACTION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ML4H_S_STRG 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_ML4H_S_STRG 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_ML4H_S_STRG INTO WA_ML4H_S_STRG.


*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 PERI7, internal->external for field JAHRPER
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_ML4H_S_STRG-JAHRPER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ML4H_S_STRG-JAHRPER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI7, internal->external for field FROM_JAHRPER
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_ML4H_S_STRG-FROM_JAHRPER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ML4H_S_STRG-FROM_JAHRPER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI7, internal->external for field PREVMON_JAHRPER
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_ML4H_S_STRG-PREVMON_JAHRPER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ML4H_S_STRG-PREVMON_JAHRPER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI7, internal->external for field NEXTMON_JAHRPER
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_ML4H_S_STRG-NEXTMON_JAHRPER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ML4H_S_STRG-NEXTMON_JAHRPER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI7, internal->external for field WIP_PRCTR_FROM
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_ML4H_S_STRG-WIP_PRCTR_FROM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ML4H_S_STRG-WIP_PRCTR_FROM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PERI7, internal->external for field WIP_PRCTR_TO
CALL FUNCTION 'CONVERSION_EXIT_PERI7_OUTPUT'
  EXPORTING
    input =                      WA_ML4H_S_STRG-WIP_PRCTR_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ML4H_S_STRG-WIP_PRCTR_TO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RLDNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ML4H_S_STRG-RLDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ML4H_S_STRG-RLDNR.
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_ML4H_S_STRG_STR, 
RUNREF TYPE STRING,
RUN_ID TYPE STRING,
JAHRPER TYPE STRING,
FROM_JAHRPER TYPE STRING,
UNTPER TYPE STRING,
APPL TYPE STRING,
OTYPE TYPE STRING,
LAST_DAY TYPE STRING,
FIRST_DAY TYPE STRING,
CURTP_10 TYPE STRING,
TRANSACTION TYPE STRING,
PRICES_FROM_ML TYPE STRING,
CREATE_BEG_INV TYPE STRING,
XSHIFTED TYPE STRING,
XMULTIPERIOD TYPE STRING,
XCYCLE TYPE STRING,
NOPLL TYPE STRING,
FSTRAT TYPE STRING,
CUTOFF TYPE STRING,
TEST TYPE STRING,
REVALUATE TYPE STRING,
REVAL_CONS TYPE STRING,
XCOBL_CONS TYPE STRING,
PSIZE_CLOSE TYPE STRING,
POSTING_MODE TYPE STRING,
PREVMON_RUNREF TYPE STRING,
PREVMON_JAHRPER TYPE STRING,
PREVMON_UNTPER TYPE STRING,
PREVMON_XPOSTING TYPE STRING,
CLOSEMON_BUDAT TYPE STRING,
CLOSEMON_PERART TYPE STRING,
NEXTMON_BUDAT TYPE STRING,
NEXTMON_JAHRPER TYPE STRING,
NEXTMON_PERART TYPE STRING,
EINKAUFSKONTO_BESTD TYPE STRING,
EINKAUFSKONTO_BLART TYPE STRING,
SHIFTED_PERIOD TYPE STRING,
RUN_LOCKED TYPE STRING,
XPARA TYPE STRING,
ALLOW_OPEN_STATUS TYPE STRING,
PRKZG TYPE STRING,
ERDIFF TYPE STRING,
XCOGSSPLIT TYPE STRING,
WIP_PRCTR_FROM TYPE STRING,
WIP_PRCTR_TO TYPE STRING,
RLDNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ML4H_S_STRG_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_ML4H_S_STRG_STR-RUNREF sy-vline 
WA_ML4H_S_STRG_STR-RUN_ID sy-vline 
WA_ML4H_S_STRG_STR-JAHRPER sy-vline 
WA_ML4H_S_STRG_STR-FROM_JAHRPER sy-vline 
WA_ML4H_S_STRG_STR-UNTPER sy-vline 
WA_ML4H_S_STRG_STR-APPL sy-vline 
WA_ML4H_S_STRG_STR-OTYPE sy-vline 
WA_ML4H_S_STRG_STR-LAST_DAY sy-vline 
WA_ML4H_S_STRG_STR-FIRST_DAY sy-vline 
WA_ML4H_S_STRG_STR-CURTP_10 sy-vline 
WA_ML4H_S_STRG_STR-TRANSACTION sy-vline 
WA_ML4H_S_STRG_STR-PRICES_FROM_ML sy-vline 
WA_ML4H_S_STRG_STR-CREATE_BEG_INV sy-vline 
WA_ML4H_S_STRG_STR-XSHIFTED sy-vline 
WA_ML4H_S_STRG_STR-XMULTIPERIOD sy-vline 
WA_ML4H_S_STRG_STR-XCYCLE sy-vline 
WA_ML4H_S_STRG_STR-NOPLL sy-vline 
WA_ML4H_S_STRG_STR-FSTRAT sy-vline 
WA_ML4H_S_STRG_STR-CUTOFF sy-vline 
WA_ML4H_S_STRG_STR-TEST sy-vline 
WA_ML4H_S_STRG_STR-REVALUATE sy-vline 
WA_ML4H_S_STRG_STR-REVAL_CONS sy-vline 
WA_ML4H_S_STRG_STR-XCOBL_CONS sy-vline 
WA_ML4H_S_STRG_STR-PSIZE_CLOSE sy-vline 
WA_ML4H_S_STRG_STR-POSTING_MODE sy-vline 
WA_ML4H_S_STRG_STR-PREVMON_RUNREF sy-vline 
WA_ML4H_S_STRG_STR-PREVMON_JAHRPER sy-vline 
WA_ML4H_S_STRG_STR-PREVMON_UNTPER sy-vline 
WA_ML4H_S_STRG_STR-PREVMON_XPOSTING sy-vline 
WA_ML4H_S_STRG_STR-CLOSEMON_BUDAT sy-vline 
WA_ML4H_S_STRG_STR-CLOSEMON_PERART sy-vline 
WA_ML4H_S_STRG_STR-NEXTMON_BUDAT sy-vline 
WA_ML4H_S_STRG_STR-NEXTMON_JAHRPER sy-vline 
WA_ML4H_S_STRG_STR-NEXTMON_PERART sy-vline 
WA_ML4H_S_STRG_STR-EINKAUFSKONTO_BESTD sy-vline 
WA_ML4H_S_STRG_STR-EINKAUFSKONTO_BLART sy-vline 
WA_ML4H_S_STRG_STR-SHIFTED_PERIOD sy-vline 
WA_ML4H_S_STRG_STR-RUN_LOCKED sy-vline 
WA_ML4H_S_STRG_STR-XPARA sy-vline 
WA_ML4H_S_STRG_STR-ALLOW_OPEN_STATUS sy-vline 
WA_ML4H_S_STRG_STR-PRKZG sy-vline 
WA_ML4H_S_STRG_STR-ERDIFF sy-vline 
WA_ML4H_S_STRG_STR-XCOGSSPLIT sy-vline 
WA_ML4H_S_STRG_STR-WIP_PRCTR_FROM sy-vline 
WA_ML4H_S_STRG_STR-WIP_PRCTR_TO sy-vline 
WA_ML4H_S_STRG_STR-RLDNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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