ABAP Select data from SAP table ALMTCUSGEN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALMTCUSGEN
*  INTO TABLE @DATA(IT_ALMTCUSGEN2).
*--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_ALMTCUSGEN INDEX 1 INTO DATA(WA_ALMTCUSGEN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ALMTCUSGEN>-MTSYSID = 1.
<ALMTCUSGEN>-MTMCNAME = 1.
<ALMTCUSGEN>-MTNUMRANGE = 1.
<ALMTCUSGEN>-MTUID = 1.
<ALMTCUSGEN>-MTCLASS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALMTCUSGEN-SETNAME, sy-vline,
  WA_ALMTCUSGEN-MTINDEX, sy-vline,
  WA_ALMTCUSGEN-EXTINDEX, sy-vline,
  WA_ALMTCUSGEN-OBJECTNAME, sy-vline,
  WA_ALMTCUSGEN-MTNAMESHRT, sy-vline,
  WA_ALMTCUSGEN-DBSTATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALMTCUSGEN 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_ALMTCUSGEN 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_ALMTCUSGEN INTO WA_ALMTCUSGEN.


*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_ALMTCUSGEN_STR, 
MTSYSID TYPE STRING,
MTMCNAME TYPE STRING,
MTNUMRANGE TYPE STRING,
MTUID TYPE STRING,
MTCLASS TYPE STRING,
SETNAME TYPE STRING,
MTINDEX TYPE STRING,
EXTINDEX TYPE STRING,
OBJECTNAME TYPE STRING,
MTNAMESHRT TYPE STRING,
DBSTATUS TYPE STRING,
SEVERITY TYPE STRING,
STATISTREC TYPE STRING,
VISUSERLEV TYPE STRING,
KEEPALTYPE TYPE STRING,
KEEPALMAX TYPE STRING,
SECTRGTOOL TYPE STRING,
SECINACTIV TYPE STRING,
WARMUPTIME TYPE STRING,
DTEXTCLASS TYPE STRING,
DTEXTID TYPE STRING,
CRTBYASSI TYPE STRING,
CHG_USER TYPE STRING,
CHG_DATE TYPE STRING,
CHG_TIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALMTCUSGEN_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_ALMTCUSGEN_STR-MTSYSID sy-vline 
WA_ALMTCUSGEN_STR-MTMCNAME sy-vline 
WA_ALMTCUSGEN_STR-MTNUMRANGE sy-vline 
WA_ALMTCUSGEN_STR-MTUID sy-vline 
WA_ALMTCUSGEN_STR-MTCLASS sy-vline 
WA_ALMTCUSGEN_STR-SETNAME sy-vline 
WA_ALMTCUSGEN_STR-MTINDEX sy-vline 
WA_ALMTCUSGEN_STR-EXTINDEX sy-vline 
WA_ALMTCUSGEN_STR-OBJECTNAME sy-vline 
WA_ALMTCUSGEN_STR-MTNAMESHRT sy-vline 
WA_ALMTCUSGEN_STR-DBSTATUS sy-vline 
WA_ALMTCUSGEN_STR-SEVERITY sy-vline 
WA_ALMTCUSGEN_STR-STATISTREC sy-vline 
WA_ALMTCUSGEN_STR-VISUSERLEV sy-vline 
WA_ALMTCUSGEN_STR-KEEPALTYPE sy-vline 
WA_ALMTCUSGEN_STR-KEEPALMAX sy-vline 
WA_ALMTCUSGEN_STR-SECTRGTOOL sy-vline 
WA_ALMTCUSGEN_STR-SECINACTIV sy-vline 
WA_ALMTCUSGEN_STR-WARMUPTIME sy-vline 
WA_ALMTCUSGEN_STR-DTEXTCLASS sy-vline 
WA_ALMTCUSGEN_STR-DTEXTID sy-vline 
WA_ALMTCUSGEN_STR-CRTBYASSI sy-vline 
WA_ALMTCUSGEN_STR-CHG_USER sy-vline 
WA_ALMTCUSGEN_STR-CHG_DATE sy-vline 
WA_ALMTCUSGEN_STR-CHG_TIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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