ABAP Select data from SAP table ALXMLMTE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALXMLMTE
*  INTO TABLE @DATA(IT_ALXMLMTE2).
*--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_ALXMLMTE INDEX 1 INTO DATA(WA_ALXMLMTE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ALXMLMTE>-NAME = 1.
<ALXMLMTE>-FULLNAME = 1.
<ALXMLMTE>-TYPE = 1.
<ALXMLMTE>-CLASS = 1.
<ALXMLMTE>-AGROUP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALXMLMTE-SUBTYPE, sy-vline,
  WA_ALXMLMTE-NUMRANGE, sy-vline,
  WA_ALXMLMTE-SEVERITY, sy-vline,
  WA_ALXMLMTE-ALKPTYPE, sy-vline,
  WA_ALXMLMTE-ALKPMAX, sy-vline,
  WA_ALXMLMTE-OWNER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALXMLMTE 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_ALXMLMTE 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_ALXMLMTE INTO WA_ALXMLMTE.


*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_ALXMLMTE_STR, 
NAME TYPE STRING,
FULLNAME TYPE STRING,
TYPE TYPE STRING,
CLASS TYPE STRING,
AGROUP TYPE STRING,
SUBTYPE TYPE STRING,
NUMRANGE TYPE STRING,
SEVERITY TYPE STRING,
ALKPTYPE TYPE STRING,
ALKPMAX TYPE STRING,
OWNER TYPE STRING,
REPORTEDBY TYPE STRING,
DESCMSGID TYPE STRING,
DESCMSGNO TYPE STRING,
CO_METHOD TYPE STRING,
AU_METHOD TYPE STRING,
AN_METHOD TYPE STRING,
SEC_REPEAT TYPE STRING,
SEC_INACT TYPE STRING,
SEC_WARMUP TYPE STRING,
CNTXT_CLNT TYPE STRING,
CNTXT_SYSW TYPE STRING,
CNTXT_SEGM TYPE STRING,
S_ALMODE TYPE STRING,
S_ALSHIFT TYPE STRING,
M_RAISEVAL TYPE STRING,
M_RAISESEV TYPE STRING,
M_AMSGMODE TYPE STRING,
M_MSGTIMFR TYPE STRING,
M_MAXALMID TYPE STRING,
M_KPLINETP TYPE STRING,
M_KPLINEMX TYPE STRING,
ALMSGID TYPE STRING,
ALMSGNO TYPE STRING,
ALMSGVAL TYPE STRING,
ALMSGSEV TYPE STRING,
MSGARG1 TYPE STRING,
MSGARG2 TYPE STRING,
MSGARG3 TYPE STRING,
MSGARG4 TYPE STRING,
DEFAULTMSG TYPE STRING,
M_CLIENT TYPE STRING,
M_USER TYPE STRING,
G2Y TYPE STRING,
Y2R TYPE STRING,
R2Y TYPE STRING,
Y2G TYPE STRING,
P_UNIT TYPE STRING,
P_DECIMALS TYPE STRING,
P_RELVAL TYPE STRING,
P_THRSHDIR TYPE STRING,
TOTALVAL TYPE STRING,
NUMBERVAL TYPE STRING,
REFTEXT TYPE STRING,
REFFNAME TYPE STRING,
ATTRTEXT TYPE STRING,
TXTFNAME TYPE STRING,
DEL_MTE TYPE STRING,
MTSYSID TYPE STRING,
MTMCNAME TYPE STRING,
MTNUMRANGE TYPE STRING,
MTUID TYPE STRING,
MTCLASS TYPE STRING,
MTINDEX TYPE STRING,
EXTINDEX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALXMLMTE_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_ALXMLMTE_STR-NAME sy-vline 
WA_ALXMLMTE_STR-FULLNAME sy-vline 
WA_ALXMLMTE_STR-TYPE sy-vline 
WA_ALXMLMTE_STR-CLASS sy-vline 
WA_ALXMLMTE_STR-AGROUP sy-vline 
WA_ALXMLMTE_STR-SUBTYPE sy-vline 
WA_ALXMLMTE_STR-NUMRANGE sy-vline 
WA_ALXMLMTE_STR-SEVERITY sy-vline 
WA_ALXMLMTE_STR-ALKPTYPE sy-vline 
WA_ALXMLMTE_STR-ALKPMAX sy-vline 
WA_ALXMLMTE_STR-OWNER sy-vline 
WA_ALXMLMTE_STR-REPORTEDBY sy-vline 
WA_ALXMLMTE_STR-DESCMSGID sy-vline 
WA_ALXMLMTE_STR-DESCMSGNO sy-vline 
WA_ALXMLMTE_STR-CO_METHOD sy-vline 
WA_ALXMLMTE_STR-AU_METHOD sy-vline 
WA_ALXMLMTE_STR-AN_METHOD sy-vline 
WA_ALXMLMTE_STR-SEC_REPEAT sy-vline 
WA_ALXMLMTE_STR-SEC_INACT sy-vline 
WA_ALXMLMTE_STR-SEC_WARMUP sy-vline 
WA_ALXMLMTE_STR-CNTXT_CLNT sy-vline 
WA_ALXMLMTE_STR-CNTXT_SYSW sy-vline 
WA_ALXMLMTE_STR-CNTXT_SEGM sy-vline 
WA_ALXMLMTE_STR-S_ALMODE sy-vline 
WA_ALXMLMTE_STR-S_ALSHIFT sy-vline 
WA_ALXMLMTE_STR-M_RAISEVAL sy-vline 
WA_ALXMLMTE_STR-M_RAISESEV sy-vline 
WA_ALXMLMTE_STR-M_AMSGMODE sy-vline 
WA_ALXMLMTE_STR-M_MSGTIMFR sy-vline 
WA_ALXMLMTE_STR-M_MAXALMID sy-vline 
WA_ALXMLMTE_STR-M_KPLINETP sy-vline 
WA_ALXMLMTE_STR-M_KPLINEMX sy-vline 
WA_ALXMLMTE_STR-ALMSGID sy-vline 
WA_ALXMLMTE_STR-ALMSGNO sy-vline 
WA_ALXMLMTE_STR-ALMSGVAL sy-vline 
WA_ALXMLMTE_STR-ALMSGSEV sy-vline 
WA_ALXMLMTE_STR-MSGARG1 sy-vline 
WA_ALXMLMTE_STR-MSGARG2 sy-vline 
WA_ALXMLMTE_STR-MSGARG3 sy-vline 
WA_ALXMLMTE_STR-MSGARG4 sy-vline 
WA_ALXMLMTE_STR-DEFAULTMSG sy-vline 
WA_ALXMLMTE_STR-M_CLIENT sy-vline 
WA_ALXMLMTE_STR-M_USER sy-vline 
WA_ALXMLMTE_STR-G2Y sy-vline 
WA_ALXMLMTE_STR-Y2R sy-vline 
WA_ALXMLMTE_STR-R2Y sy-vline 
WA_ALXMLMTE_STR-Y2G sy-vline 
WA_ALXMLMTE_STR-P_UNIT sy-vline 
WA_ALXMLMTE_STR-P_DECIMALS sy-vline 
WA_ALXMLMTE_STR-P_RELVAL sy-vline 
WA_ALXMLMTE_STR-P_THRSHDIR sy-vline 
WA_ALXMLMTE_STR-TOTALVAL sy-vline 
WA_ALXMLMTE_STR-NUMBERVAL sy-vline 
WA_ALXMLMTE_STR-REFTEXT sy-vline 
WA_ALXMLMTE_STR-REFFNAME sy-vline 
WA_ALXMLMTE_STR-ATTRTEXT sy-vline 
WA_ALXMLMTE_STR-TXTFNAME sy-vline 
WA_ALXMLMTE_STR-DEL_MTE sy-vline 
WA_ALXMLMTE_STR-MTSYSID sy-vline 
WA_ALXMLMTE_STR-MTMCNAME sy-vline 
WA_ALXMLMTE_STR-MTNUMRANGE sy-vline 
WA_ALXMLMTE_STR-MTUID sy-vline 
WA_ALXMLMTE_STR-MTCLASS sy-vline 
WA_ALXMLMTE_STR-MTINDEX sy-vline 
WA_ALXMLMTE_STR-EXTINDEX sy-vline      INTO ld_text SEPARATED BY SPACE.

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