ABAP Select data from SAP table ALAVLCNTL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ALAVLCNTL
*  INTO TABLE @DATA(IT_ALAVLCNTL2).
*--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_ALAVLCNTL INDEX 1 INTO DATA(WA_ALAVLCNTL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ALAVLCNTL>-TREETYPE = 1.
<ALAVLCNTL>-SYSGUID = 1.
<ALAVLCNTL>-NSGUID = 1.
<ALAVLCNTL>-NSTYPE = 1.
<ALAVLCNTL>-AVCHECK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ALAVLCNTL-SERVICE, sy-vline,
  WA_ALAVLCNTL-DNSNAME, sy-vline,
  WA_ALAVLCNTL-ROUTE_TO, sy-vline,
  WA_ALAVLCNTL-CHG_USER, sy-vline,
  WA_ALAVLCNTL-CHG_REPORT, sy-vline,
  WA_ALAVLCNTL-CHG_DATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ALAVLCNTL 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_ALAVLCNTL 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_ALAVLCNTL INTO WA_ALAVLCNTL.


*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_ALAVLCNTL_STR, 
TREETYPE TYPE STRING,
SYSGUID TYPE STRING,
NSGUID TYPE STRING,
NSTYPE TYPE STRING,
AVCHECK TYPE STRING,
SERVICE TYPE STRING,
DNSNAME TYPE STRING,
ROUTE_TO TYPE STRING,
CHG_USER TYPE STRING,
CHG_REPORT TYPE STRING,
CHG_DATE TYPE STRING,
CHG_TIME TYPE STRING,
RESERVE_C TYPE STRING,
RESERVE_I TYPE STRING,
DWNTIME TYPE STRING,
I_CHECK TYPE STRING,
J_CHECK TYPE STRING,
P_CHECK TYPE STRING,
G_CHK_ALL TYPE STRING,
G_CHK_NON TYPE STRING,
G_CHK_MRK TYPE STRING,
G_CHK_NEW TYPE STRING,
SYSDESC TYPE STRING,
PING_DEST TYPE STRING,
CSERVICE TYPE STRING,
CDNSNAME TYPE STRING,
CROUTE_TO TYPE STRING,
J_CHECK63 TYPE STRING,
RFC_MESSAGE TYPE STRING,
ABAP_MS_RC TYPE STRING,
CSC_MS_RC TYPE STRING,
ABAP_MS_RESP TYPE STRING,
CSC_MS_RESP TYPE STRING,
REFGROUP TYPE STRING,
JHEADCHK TYPE STRING,
JHEADPRFX TYPE STRING,
NIPING_PORT_ABAP TYPE STRING,
NIPING_PORT_JAVA TYPE STRING,
MS_CHECK TYPE STRING,
MON_OPT_TX TYPE STRING,
GRP_OPT_TX TYPE STRING,
MON_CMP_TP TYPE STRING,
MON_CMP_NM TYPE STRING,
CMP_HOST TYPE STRING,
CMP_SERVICE TYPE STRING,
INST_CHECK TYPE STRING,
J2EE_CHECK TYPE STRING,
PING_CHECK TYPE STRING,
GRP_CHECK TYPE STRING,
ADDTL_CHECK TYPE STRING,
MON_CMP_DSC TYPE STRING,
NODE_KEY TYPE STRING,
DIRTY TYPE STRING,
CPHSCHEMA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ALAVLCNTL_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_ALAVLCNTL_STR-TREETYPE sy-vline 
WA_ALAVLCNTL_STR-SYSGUID sy-vline 
WA_ALAVLCNTL_STR-NSGUID sy-vline 
WA_ALAVLCNTL_STR-NSTYPE sy-vline 
WA_ALAVLCNTL_STR-AVCHECK sy-vline 
WA_ALAVLCNTL_STR-SERVICE sy-vline 
WA_ALAVLCNTL_STR-DNSNAME sy-vline 
WA_ALAVLCNTL_STR-ROUTE_TO sy-vline 
WA_ALAVLCNTL_STR-CHG_USER sy-vline 
WA_ALAVLCNTL_STR-CHG_REPORT sy-vline 
WA_ALAVLCNTL_STR-CHG_DATE sy-vline 
WA_ALAVLCNTL_STR-CHG_TIME sy-vline 
WA_ALAVLCNTL_STR-RESERVE_C sy-vline 
WA_ALAVLCNTL_STR-RESERVE_I sy-vline 
WA_ALAVLCNTL_STR-DWNTIME sy-vline 
WA_ALAVLCNTL_STR-I_CHECK sy-vline 
WA_ALAVLCNTL_STR-J_CHECK sy-vline 
WA_ALAVLCNTL_STR-P_CHECK sy-vline 
WA_ALAVLCNTL_STR-G_CHK_ALL sy-vline 
WA_ALAVLCNTL_STR-G_CHK_NON sy-vline 
WA_ALAVLCNTL_STR-G_CHK_MRK sy-vline 
WA_ALAVLCNTL_STR-G_CHK_NEW sy-vline 
WA_ALAVLCNTL_STR-SYSDESC sy-vline 
WA_ALAVLCNTL_STR-PING_DEST sy-vline 
WA_ALAVLCNTL_STR-CSERVICE sy-vline 
WA_ALAVLCNTL_STR-CDNSNAME sy-vline 
WA_ALAVLCNTL_STR-CROUTE_TO sy-vline 
WA_ALAVLCNTL_STR-J_CHECK63 sy-vline 
WA_ALAVLCNTL_STR-RFC_MESSAGE sy-vline 
WA_ALAVLCNTL_STR-ABAP_MS_RC sy-vline 
WA_ALAVLCNTL_STR-CSC_MS_RC sy-vline 
WA_ALAVLCNTL_STR-ABAP_MS_RESP sy-vline 
WA_ALAVLCNTL_STR-CSC_MS_RESP sy-vline 
WA_ALAVLCNTL_STR-REFGROUP sy-vline 
WA_ALAVLCNTL_STR-JHEADCHK sy-vline 
WA_ALAVLCNTL_STR-JHEADPRFX sy-vline 
WA_ALAVLCNTL_STR-NIPING_PORT_ABAP sy-vline 
WA_ALAVLCNTL_STR-NIPING_PORT_JAVA sy-vline 
WA_ALAVLCNTL_STR-MS_CHECK sy-vline 
WA_ALAVLCNTL_STR-MON_OPT_TX sy-vline 
WA_ALAVLCNTL_STR-GRP_OPT_TX sy-vline 
WA_ALAVLCNTL_STR-MON_CMP_TP sy-vline 
WA_ALAVLCNTL_STR-MON_CMP_NM sy-vline 
WA_ALAVLCNTL_STR-CMP_HOST sy-vline 
WA_ALAVLCNTL_STR-CMP_SERVICE sy-vline 
WA_ALAVLCNTL_STR-INST_CHECK sy-vline 
WA_ALAVLCNTL_STR-J2EE_CHECK sy-vline 
WA_ALAVLCNTL_STR-PING_CHECK sy-vline 
WA_ALAVLCNTL_STR-GRP_CHECK sy-vline 
WA_ALAVLCNTL_STR-ADDTL_CHECK sy-vline 
WA_ALAVLCNTL_STR-MON_CMP_DSC sy-vline 
WA_ALAVLCNTL_STR-NODE_KEY sy-vline 
WA_ALAVLCNTL_STR-DIRTY sy-vline 
WA_ALAVLCNTL_STR-CPHSCHEMA sy-vline      INTO ld_text SEPARATED BY SPACE.

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