ABAP Select data from SAP table ESH_U_MAINTNOTIF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ESH_U_MAINTNOTIF
*  INTO TABLE @DATA(IT_ESH_U_MAINTNOTIF2).
*--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_ESH_U_MAINTNOTIF INDEX 1 INTO DATA(WA_ESH_U_MAINTNOTIF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ESH_U_MAINTNOTIF>-MANDT = 1.
<ESH_U_MAINTNOTIF>-MAINTENANCENOTIFICATION = 1.
<ESH_U_MAINTNOTIF>-PLAINLONGTEXT = 1.
<ESH_U_MAINTNOTIF>-MAINTENANCEOBJECTISDOWN = 1.
<ESH_U_MAINTNOTIF>-MAINTENANCEACTIVITYTYPENAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ESH_U_MAINTNOTIF-MAINTENANCEACTIVITYTYPE, sy-vline,
  WA_ESH_U_MAINTNOTIF-WORKCENTER, sy-vline,
  WA_ESH_U_MAINTNOTIF-PLANTSECTION, sy-vline,
  WA_ESH_U_MAINTNOTIF-MAINTENANCEOBJECTLOCATION, sy-vline,
  WA_ESH_U_MAINTNOTIF-MAINTENANCEPLANNINGPLANT, sy-vline,
  WA_ESH_U_MAINTNOTIF-MAINTENANCEPLANNERGROUP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ESH_U_MAINTNOTIF 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_ESH_U_MAINTNOTIF 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_ESH_U_MAINTNOTIF INTO WA_ESH_U_MAINTNOTIF.


*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.

*Conversion exit ALPHA, internal->external for field MAINTENANCENOTIFICATION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTNOTIF-MAINTENANCENOTIFICATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTNOTIF-MAINTENANCENOTIFICATION.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field ASSEMBLY
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTNOTIF-ASSEMBLY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTNOTIF-ASSEMBLY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUIPMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTNOTIF-EQUIPMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTNOTIF-EQUIPMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MAINTENANCEORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTNOTIF-MAINTENANCEORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTNOTIF-MAINTENANCEORDER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field COSTCENTER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ESH_U_MAINTNOTIF-COSTCENTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ESH_U_MAINTNOTIF-COSTCENTER.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_ESH_U_MAINTNOTIF_STR, 
MANDT TYPE STRING,
MAINTENANCENOTIFICATION TYPE STRING,
PLAINLONGTEXT TYPE STRING,
MAINTENANCEOBJECTISDOWN TYPE STRING,
MAINTENANCEACTIVITYTYPENAME TYPE STRING,
MAINTENANCEACTIVITYTYPE TYPE STRING,
WORKCENTER TYPE STRING,
PLANTSECTION TYPE STRING,
MAINTENANCEOBJECTLOCATION TYPE STRING,
MAINTENANCEPLANNINGPLANT TYPE STRING,
MAINTENANCEPLANNERGROUP TYPE STRING,
MAINTENANCEREVISION TYPE STRING,
ASSEMBLY TYPE STRING,
EQUIPMENT TYPE STRING,
NOTIFICATIONTYPENAME TYPE STRING,
MAINTPRIORITYDESC TYPE STRING,
MAINTNOTIFTASKTXT TYPE STRING,
MAINTNOTIFACTYTXT TYPE STRING,
MAINTNOTIFCAUSETEXT TYPE STRING,
MAINTNOTIFITEMTEXT TYPE STRING,
MAINTNOTIFICATIONCODEGROUP TYPE STRING,
MAINTNOTIFICATIONCODE TYPE STRING,
MAINTNOTIFICATIONCATALOG TYPE STRING,
NOTIFICATIONREFERENCEDATE TYPE STRING,
MAINTPRIORITY TYPE STRING,
REQUIREDENDDATE TYPE STRING,
REQUIREDSTARTDATE TYPE STRING,
MAINTENANCEORDER TYPE STRING,
NOTIFICATIONTEXT TYPE STRING,
REPORTEDBYUSER TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
CREATEDBYUSER TYPE STRING,
NOTIFPROCESSINGPHASE TYPE STRING,
NOTIFPROCESSINGPHASEDESC TYPE STRING,
NOTIFICATIONTYPE TYPE STRING,
MAINTPRIORITYTYPE TYPE STRING,
FUNCNLLOCPRIMARYLABELNAME TYPE STRING,
AUTHGROUPEQ TYPE STRING,
CONTROLLINGAREA TYPE STRING,
COSTCENTER TYPE STRING,
AUTHGROUPFL TYPE STRING,
MAINTENANCEPLANT TYPE STRING,
LATESTACCEPTABLECOMPLETIONDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ESH_U_MAINTNOTIF_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_ESH_U_MAINTNOTIF_STR-MANDT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCENOTIFICATION sy-vline 
WA_ESH_U_MAINTNOTIF_STR-PLAINLONGTEXT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCEOBJECTISDOWN sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCEACTIVITYTYPENAME sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCEACTIVITYTYPE sy-vline 
WA_ESH_U_MAINTNOTIF_STR-WORKCENTER sy-vline 
WA_ESH_U_MAINTNOTIF_STR-PLANTSECTION sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCEOBJECTLOCATION sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCEPLANNINGPLANT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCEPLANNERGROUP sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCEREVISION sy-vline 
WA_ESH_U_MAINTNOTIF_STR-ASSEMBLY sy-vline 
WA_ESH_U_MAINTNOTIF_STR-EQUIPMENT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-NOTIFICATIONTYPENAME sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTPRIORITYDESC sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTNOTIFTASKTXT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTNOTIFACTYTXT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTNOTIFCAUSETEXT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTNOTIFITEMTEXT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTNOTIFICATIONCODEGROUP sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTNOTIFICATIONCODE sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTNOTIFICATIONCATALOG sy-vline 
WA_ESH_U_MAINTNOTIF_STR-NOTIFICATIONREFERENCEDATE sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTPRIORITY sy-vline 
WA_ESH_U_MAINTNOTIF_STR-REQUIREDENDDATE sy-vline 
WA_ESH_U_MAINTNOTIF_STR-REQUIREDSTARTDATE sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCEORDER sy-vline 
WA_ESH_U_MAINTNOTIF_STR-NOTIFICATIONTEXT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-REPORTEDBYUSER sy-vline 
WA_ESH_U_MAINTNOTIF_STR-LASTCHANGEDBYUSER sy-vline 
WA_ESH_U_MAINTNOTIF_STR-CREATEDBYUSER sy-vline 
WA_ESH_U_MAINTNOTIF_STR-NOTIFPROCESSINGPHASE sy-vline 
WA_ESH_U_MAINTNOTIF_STR-NOTIFPROCESSINGPHASEDESC sy-vline 
WA_ESH_U_MAINTNOTIF_STR-NOTIFICATIONTYPE sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTPRIORITYTYPE sy-vline 
WA_ESH_U_MAINTNOTIF_STR-FUNCNLLOCPRIMARYLABELNAME sy-vline 
WA_ESH_U_MAINTNOTIF_STR-AUTHGROUPEQ sy-vline 
WA_ESH_U_MAINTNOTIF_STR-CONTROLLINGAREA sy-vline 
WA_ESH_U_MAINTNOTIF_STR-COSTCENTER sy-vline 
WA_ESH_U_MAINTNOTIF_STR-AUTHGROUPFL sy-vline 
WA_ESH_U_MAINTNOTIF_STR-MAINTENANCEPLANT sy-vline 
WA_ESH_U_MAINTNOTIF_STR-LATESTACCEPTABLECOMPLETIONDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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