ABAP Select data from SAP table /BI0/MRSTT_LGUID into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /BI0/MRSTT_LGUID 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 /BI0/MRSTT_LGUID. 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 /BI0/MRSTT_LGUID 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_/BI0/MRSTT_LGUID TYPE STANDARD TABLE OF /BI0/MRSTT_LGUID,
      WA_/BI0/MRSTT_LGUID TYPE /BI0/MRSTT_LGUID,
      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: </BI0/MRSTT_LGUID> TYPE /BI0/MRSTT_LGUID.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/BI0/MRSTT_LGUID.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /BI0/MRSTT_LGUID
  INTO TABLE IT_/BI0/MRSTT_LGUID.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /BI0/MRSTT_LGUID
*  INTO TABLE @DATA(IT_/BI0/MRSTT_LGUID2).
*--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_/BI0/MRSTT_LGUID INDEX 1 INTO DATA(WA_/BI0/MRSTT_LGUID2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/BI0/MRSTT_LGUID ASSIGNING </BI0/MRSTT_LGUID>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</BI0/MRSTT_LGUID>-RSTT_LGUID = 1.
</BI0/MRSTT_LGUID>-OBJVERS = 1.
</BI0/MRSTT_LGUID>-CHANGED = 1.
</BI0/MRSTT_LGUID>-RSTT_JGUID = 1.
</BI0/MRSTT_LGUID>-RSTT_JID = 1.

ENDLOOP.

LOOP AT IT_/BI0/MRSTT_LGUID INTO WA_/BI0/MRSTT_LGUID.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/BI0/MRSTT_LGUID-RSTT_PGUID, sy-vline,
  WA_/BI0/MRSTT_LGUID-RSTT_PID, sy-vline,
  WA_/BI0/MRSTT_LGUID-CALDAY, sy-vline,
  WA_/BI0/MRSTT_LGUID-RSTT_USER, sy-vline,
  WA_/BI0/MRSTT_LGUID-RSTT_TAREA, sy-vline,
  WA_/BI0/MRSTT_LGUID-RSTT_TTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/BI0/MRSTT_LGUID 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_/BI0/MRSTT_LGUID 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_/BI0/MRSTT_LGUID INTO WA_/BI0/MRSTT_LGUID.


*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 ALPHA, internal->external for field RSTT_LGUID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_LGUID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_LGUID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSTT_JGUID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_JGUID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_JGUID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSTT_JID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_JID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_JID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSTT_PGUID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_PGUID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_PGUID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSTT_PID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_PID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_PID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSTT_USER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_USER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_USER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSTT_TAREA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_TAREA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_TAREA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSTT_TTYPE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_TTYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_TTYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSTT_LOGNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_LOGNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_LOGNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RSTT_TSTMP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/BI0/MRSTT_LGUID-RSTT_TSTMP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/BI0/MRSTT_LGUID-RSTT_TSTMP.
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_/BI0/MRSTT_LGUID_STR, 
RSTT_LGUID TYPE STRING,
OBJVERS TYPE STRING,
CHANGED TYPE STRING,
RSTT_JGUID TYPE STRING,
RSTT_JID TYPE STRING,
RSTT_PGUID TYPE STRING,
RSTT_PID TYPE STRING,
CALDAY TYPE STRING,
RSTT_USER TYPE STRING,
RSTT_TAREA TYPE STRING,
RSTT_TTYPE TYPE STRING,
RSTT_LOGNR TYPE STRING,
TIME TYPE STRING,
RSTT_RTIML TYPE STRING,
RSTT_TSTMP TYPE STRING,
RSTT_EAMT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/BI0/MRSTT_LGUID_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_/BI0/MRSTT_LGUID_STR-RSTT_LGUID sy-vline 
WA_/BI0/MRSTT_LGUID_STR-OBJVERS sy-vline 
WA_/BI0/MRSTT_LGUID_STR-CHANGED sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_JGUID sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_JID sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_PGUID sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_PID sy-vline 
WA_/BI0/MRSTT_LGUID_STR-CALDAY sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_USER sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_TAREA sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_TTYPE sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_LOGNR sy-vline 
WA_/BI0/MRSTT_LGUID_STR-TIME sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_RTIML sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_TSTMP sy-vline 
WA_/BI0/MRSTT_LGUID_STR-RSTT_EAMT sy-vline      INTO ld_text SEPARATED BY SPACE.

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