ABAP Select data from SAP table GWY_STAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GWY_STAT
*  INTO TABLE @DATA(IT_GWY_STAT2).
*--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_GWY_STAT INDEX 1 INTO DATA(WA_GWY_STAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GWY_STAT>-ACTIVE = 1.
<GWY_STAT>-TIMEOUT_M = 1.
<GWY_STAT>-TIMEOUT = 1.
<GWY_STAT>-OVERFLOW_M = 1.
<GWY_STAT>-OVERFLOW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GWY_STAT-ACTOVUSAGE, sy-vline,
  WA_GWY_STAT-MAXOVUSAGE, sy-vline,
  WA_GWY_STAT-MAXSTACK, sy-vline,
  WA_GWY_STAT-USESHRBLK, sy-vline,
  WA_GWY_STAT-MAXUSESHRB, sy-vline,
  WA_GWY_STAT-CONNECTS_M, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GWY_STAT 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_GWY_STAT 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_GWY_STAT INTO WA_GWY_STAT.


*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_GWY_STAT_STR, 
ACTIVE TYPE STRING,
TIMEOUT_M TYPE STRING,
TIMEOUT TYPE STRING,
OVERFLOW_M TYPE STRING,
OVERFLOW TYPE STRING,
ACTOVUSAGE TYPE STRING,
MAXOVUSAGE TYPE STRING,
MAXSTACK TYPE STRING,
USESHRBLK TYPE STRING,
MAXUSESHRB TYPE STRING,
CONNECTS_M TYPE STRING,
CONNECTS TYPE STRING,
CMINIT_M TYPE STRING,
CMINIT TYPE STRING,
GWRD_REQ_M TYPE STRING,
GWRD_REQ TYPE STRING,
RD_TIMESEC TYPE STRING,
RD_TIMEUSE TYPE STRING,
RD_TIMEMIN TYPE STRING,
RD_TIMEMAX TYPE STRING,
GWWP_REQ_M TYPE STRING,
GWWP_REQ TYPE STRING,
WP_TIMESEC TYPE STRING,
WP_TIMEUSE TYPE STRING,
WP_TIMEMIN TYPE STRING,
WP_TIMEMAX TYPE STRING,
TCP_READ_M TYPE STRING,
TCP_READ TYPE STRING,
TCP_FREADM TYPE STRING,
TCP_FREAD TYPE STRING,
TCP_RBYT_M TYPE STRING,
TCP_RBYT TYPE STRING,
TR_TIMESEC TYPE STRING,
TR_TIMEUSE TYPE STRING,
TR_TIMEMIN TYPE STRING,
TR_TIMEMAX TYPE STRING,
TCP_WRIT_M TYPE STRING,
TCP_WRIT TYPE STRING,
TCP_FWRITM TYPE STRING,
TCP_FWRIT TYPE STRING,
TCP_WBYT_M TYPE STRING,
TCP_WBYT TYPE STRING,
TW_TIMESEC TYPE STRING,
TW_TIMEUSE TYPE STRING,
TW_TIMEMIN TYPE STRING,
TW_TIMEMAX TYPE STRING,
TCP_ERROR TYPE STRING,
CPIC_READM TYPE STRING,
CPIC_READ TYPE STRING,
CPIC_RBYTM TYPE STRING,
CPIC_RBYT TYPE STRING,
CR_TIMESEC TYPE STRING,
CR_TIMEUSE TYPE STRING,
CR_TIMEMIN TYPE STRING,
CR_TIMEMAX TYPE STRING,
CPIC_WRITM TYPE STRING,
CPIC_WRIT TYPE STRING,
CPIC_WBYTM TYPE STRING,
CPIC_WBYT TYPE STRING,
CW_TIMESEC TYPE STRING,
CW_TIMEUSE TYPE STRING,
CW_TIMEMIN TYPE STRING,
CW_TIMEMAX TYPE STRING,
CPIC_ERROR TYPE STRING,
CONVNO TYPE STRING,
TCP_CONVNO TYPE STRING,
SNA_CONVNO TYPE STRING,
OVERFLSIZE TYPE STRING,
CONN TYPE STRING,
PENDING_REQ_PEAK TYPE STRING,
MAXSHMREQ TYPE STRING,
REQSTACKSZ TYPE STRING,
ACTMAXSTCK TYPE STRING,
CONNACTMAX TYPE STRING,
RD_LONG_RQ TYPE STRING,
FILLER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GWY_STAT_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_GWY_STAT_STR-ACTIVE sy-vline 
WA_GWY_STAT_STR-TIMEOUT_M sy-vline 
WA_GWY_STAT_STR-TIMEOUT sy-vline 
WA_GWY_STAT_STR-OVERFLOW_M sy-vline 
WA_GWY_STAT_STR-OVERFLOW sy-vline 
WA_GWY_STAT_STR-ACTOVUSAGE sy-vline 
WA_GWY_STAT_STR-MAXOVUSAGE sy-vline 
WA_GWY_STAT_STR-MAXSTACK sy-vline 
WA_GWY_STAT_STR-USESHRBLK sy-vline 
WA_GWY_STAT_STR-MAXUSESHRB sy-vline 
WA_GWY_STAT_STR-CONNECTS_M sy-vline 
WA_GWY_STAT_STR-CONNECTS sy-vline 
WA_GWY_STAT_STR-CMINIT_M sy-vline 
WA_GWY_STAT_STR-CMINIT sy-vline 
WA_GWY_STAT_STR-GWRD_REQ_M sy-vline 
WA_GWY_STAT_STR-GWRD_REQ sy-vline 
WA_GWY_STAT_STR-RD_TIMESEC sy-vline 
WA_GWY_STAT_STR-RD_TIMEUSE sy-vline 
WA_GWY_STAT_STR-RD_TIMEMIN sy-vline 
WA_GWY_STAT_STR-RD_TIMEMAX sy-vline 
WA_GWY_STAT_STR-GWWP_REQ_M sy-vline 
WA_GWY_STAT_STR-GWWP_REQ sy-vline 
WA_GWY_STAT_STR-WP_TIMESEC sy-vline 
WA_GWY_STAT_STR-WP_TIMEUSE sy-vline 
WA_GWY_STAT_STR-WP_TIMEMIN sy-vline 
WA_GWY_STAT_STR-WP_TIMEMAX sy-vline 
WA_GWY_STAT_STR-TCP_READ_M sy-vline 
WA_GWY_STAT_STR-TCP_READ sy-vline 
WA_GWY_STAT_STR-TCP_FREADM sy-vline 
WA_GWY_STAT_STR-TCP_FREAD sy-vline 
WA_GWY_STAT_STR-TCP_RBYT_M sy-vline 
WA_GWY_STAT_STR-TCP_RBYT sy-vline 
WA_GWY_STAT_STR-TR_TIMESEC sy-vline 
WA_GWY_STAT_STR-TR_TIMEUSE sy-vline 
WA_GWY_STAT_STR-TR_TIMEMIN sy-vline 
WA_GWY_STAT_STR-TR_TIMEMAX sy-vline 
WA_GWY_STAT_STR-TCP_WRIT_M sy-vline 
WA_GWY_STAT_STR-TCP_WRIT sy-vline 
WA_GWY_STAT_STR-TCP_FWRITM sy-vline 
WA_GWY_STAT_STR-TCP_FWRIT sy-vline 
WA_GWY_STAT_STR-TCP_WBYT_M sy-vline 
WA_GWY_STAT_STR-TCP_WBYT sy-vline 
WA_GWY_STAT_STR-TW_TIMESEC sy-vline 
WA_GWY_STAT_STR-TW_TIMEUSE sy-vline 
WA_GWY_STAT_STR-TW_TIMEMIN sy-vline 
WA_GWY_STAT_STR-TW_TIMEMAX sy-vline 
WA_GWY_STAT_STR-TCP_ERROR sy-vline 
WA_GWY_STAT_STR-CPIC_READM sy-vline 
WA_GWY_STAT_STR-CPIC_READ sy-vline 
WA_GWY_STAT_STR-CPIC_RBYTM sy-vline 
WA_GWY_STAT_STR-CPIC_RBYT sy-vline 
WA_GWY_STAT_STR-CR_TIMESEC sy-vline 
WA_GWY_STAT_STR-CR_TIMEUSE sy-vline 
WA_GWY_STAT_STR-CR_TIMEMIN sy-vline 
WA_GWY_STAT_STR-CR_TIMEMAX sy-vline 
WA_GWY_STAT_STR-CPIC_WRITM sy-vline 
WA_GWY_STAT_STR-CPIC_WRIT sy-vline 
WA_GWY_STAT_STR-CPIC_WBYTM sy-vline 
WA_GWY_STAT_STR-CPIC_WBYT sy-vline 
WA_GWY_STAT_STR-CW_TIMESEC sy-vline 
WA_GWY_STAT_STR-CW_TIMEUSE sy-vline 
WA_GWY_STAT_STR-CW_TIMEMIN sy-vline 
WA_GWY_STAT_STR-CW_TIMEMAX sy-vline 
WA_GWY_STAT_STR-CPIC_ERROR sy-vline 
WA_GWY_STAT_STR-CONVNO sy-vline 
WA_GWY_STAT_STR-TCP_CONVNO sy-vline 
WA_GWY_STAT_STR-SNA_CONVNO sy-vline 
WA_GWY_STAT_STR-OVERFLSIZE sy-vline 
WA_GWY_STAT_STR-CONN sy-vline 
WA_GWY_STAT_STR-PENDING_REQ_PEAK sy-vline 
WA_GWY_STAT_STR-MAXSHMREQ sy-vline 
WA_GWY_STAT_STR-REQSTACKSZ sy-vline 
WA_GWY_STAT_STR-ACTMAXSTCK sy-vline 
WA_GWY_STAT_STR-CONNACTMAX sy-vline 
WA_GWY_STAT_STR-RD_LONG_RQ sy-vline 
WA_GWY_STAT_STR-FILLER sy-vline      INTO ld_text SEPARATED BY SPACE.

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