ABAP Select data from SAP table SQLMZM into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP SQLMZM 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 SQLMZM. 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 SQLMZM 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_SQLMZM TYPE STANDARD TABLE OF SQLMZM,
      WA_SQLMZM TYPE SQLMZM,
      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: <SQLMZM> TYPE SQLMZM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SQLMZM
*  INTO TABLE @DATA(IT_SQLMZM2).
*--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_SQLMZM INDEX 1 INTO DATA(WA_SQLMZM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SQLMZM>-MEASID = 1.
<SQLMZM>-KIND = 1.
<SQLMZM>-SYSID = 1.
<SQLMZM>-CREATEDON = 1.
<SQLMZM>-CREATEDBY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SQLMZM-PERIODSIZE, sy-vline,
  WA_SQLMZM-AGGRMEASID, sy-vline,
  WA_SQLMZM-ROOTIDKIND, sy-vline,
  WA_SQLMZM-PARAMVALUE, sy-vline,
  WA_SQLMZM-MISSINGXCNT, sy-vline,
  WA_SQLMZM-CURRRECCNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SQLMZM 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_SQLMZM 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_SQLMZM INTO WA_SQLMZM.


*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_SQLMZM_STR, 
MEASID TYPE STRING,
KIND TYPE STRING,
SYSID TYPE STRING,
CREATEDON TYPE STRING,
CREATEDBY TYPE STRING,
PERIODSIZE TYPE STRING,
AGGRMEASID TYPE STRING,
ROOTIDKIND TYPE STRING,
PARAMVALUE TYPE STRING,
MISSINGXCNT TYPE STRING,
CURRRECCNT TYPE STRING,
TIMERECCNT TYPE STRING,
AGGRRECCNT TYPE STRING,
CURREXECNT TYPE STRING,
TIMEEXECNT TYPE STRING,
AGGREXECNT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SQLMZM_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_SQLMZM_STR-MEASID sy-vline 
WA_SQLMZM_STR-KIND sy-vline 
WA_SQLMZM_STR-SYSID sy-vline 
WA_SQLMZM_STR-CREATEDON sy-vline 
WA_SQLMZM_STR-CREATEDBY sy-vline 
WA_SQLMZM_STR-PERIODSIZE sy-vline 
WA_SQLMZM_STR-AGGRMEASID sy-vline 
WA_SQLMZM_STR-ROOTIDKIND sy-vline 
WA_SQLMZM_STR-PARAMVALUE sy-vline 
WA_SQLMZM_STR-MISSINGXCNT sy-vline 
WA_SQLMZM_STR-CURRRECCNT sy-vline 
WA_SQLMZM_STR-TIMERECCNT sy-vline 
WA_SQLMZM_STR-AGGRRECCNT sy-vline 
WA_SQLMZM_STR-CURREXECNT sy-vline 
WA_SQLMZM_STR-TIMEEXECNT sy-vline 
WA_SQLMZM_STR-AGGREXECNT sy-vline      INTO ld_text SEPARATED BY SPACE.

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