ABAP Select data from SAP table SQLMZS 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 SQLMZS 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 SQLMZS. 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 SQLMZS 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_SQLMZS TYPE STANDARD TABLE OF SQLMZS,
      WA_SQLMZS TYPE SQLMZS,
      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: <SQLMZS> TYPE SQLMZS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SQLMZS
*  INTO TABLE @DATA(IT_SQLMZS2).
*--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_SQLMZS INDEX 1 INTO DATA(WA_SQLMZS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SQLMZS>-MEASID = 1.
<SQLMZS>-SUBID = 1.
<SQLMZS>-RUNLEVEL = 1.
<SQLMZS>-ROOTTYPE = 1.
<SQLMZS>-ROOTNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SQLMZS-STMTKIND, sy-vline,
  WA_SQLMZS-TABLENAMES, sy-vline,
  WA_SQLMZS-TABLENAME01, sy-vline,
  WA_SQLMZS-TABLENAME02, sy-vline,
  WA_SQLMZS-TABLENAME03, sy-vline,
  WA_SQLMZS-TABLENAME04, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SQLMZS 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_SQLMZS 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_SQLMZS INTO WA_SQLMZS.


*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_SQLMZS_STR, 
MEASID TYPE STRING,
SUBID TYPE STRING,
RUNLEVEL TYPE STRING,
ROOTTYPE TYPE STRING,
ROOTNAME TYPE STRING,
STMTKIND TYPE STRING,
TABLENAMES TYPE STRING,
TABLENAME01 TYPE STRING,
TABLENAME02 TYPE STRING,
TABLENAME03 TYPE STRING,
TABLENAME04 TYPE STRING,
TABLENAME05 TYPE STRING,
TABLENAME06 TYPE STRING,
TABLENAME07 TYPE STRING,
TABLENAME08 TYPE STRING,
TABLENAME09 TYPE STRING,
TABLENAME10 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SQLMZS_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_SQLMZS_STR-MEASID sy-vline 
WA_SQLMZS_STR-SUBID sy-vline 
WA_SQLMZS_STR-RUNLEVEL sy-vline 
WA_SQLMZS_STR-ROOTTYPE sy-vline 
WA_SQLMZS_STR-ROOTNAME sy-vline 
WA_SQLMZS_STR-STMTKIND sy-vline 
WA_SQLMZS_STR-TABLENAMES sy-vline 
WA_SQLMZS_STR-TABLENAME01 sy-vline 
WA_SQLMZS_STR-TABLENAME02 sy-vline 
WA_SQLMZS_STR-TABLENAME03 sy-vline 
WA_SQLMZS_STR-TABLENAME04 sy-vline 
WA_SQLMZS_STR-TABLENAME05 sy-vline 
WA_SQLMZS_STR-TABLENAME06 sy-vline 
WA_SQLMZS_STR-TABLENAME07 sy-vline 
WA_SQLMZS_STR-TABLENAME08 sy-vline 
WA_SQLMZS_STR-TABLENAME09 sy-vline 
WA_SQLMZS_STR-TABLENAME10 sy-vline      INTO ld_text SEPARATED BY SPACE.

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