abap动态内表
This Tutorial details about creation of dynamic internal table with different scenarios
Internal Tables are local tables within a program containing a series of lines having same data type. ABAPTM Open SQL allows single field, range of fields, entire database table or view into an internal table.
In technical terms Internal table is a dynamic sequential dataset in which all records have the same data structure and a key.
A static internal table can be declared in an ABAPTM program initially, when the structure of the internal table is fixed and known to the user.
Dynamic internal table is an extension to internal table concept, used when the number of fields is not known at the design time or until the compile time.
Scenario 1:
Display the table of contents in grid format using the dynamic internal table.
Creating Dynamic internal table
PARAMETERS : p_table(10) TYPE C.
DATA: w_tabname TYPE w_tabname,
w_dref TYPE REF TO data,
w_grid TYPE REF TO cl_gui_alv_grid.
FIELD-SYMBOLS: <t_itab> TYPE ANY TABLE.
w_tabname = p_table.
CREATE DATA w_dref TYPE TABLE OF (w_tabname).
ASSIGN w_dref->* TO <t_itab>.
Populating Dynamic internal table
SELECT *
FROM (w_tabname) UP TO 20 ROWS
INTO TABLE <t_itab>.
Displaying dynamic internal table using Grid.
CREATE OBJECT w_grid
EXPORTING i_parent = cl_gui_container=>screen0.
CALL METHOD w_grid->set_table_for_first_display
EXPORTING
i_structure_name = w_tabname
CHANGING
it_outtab = <t_itab>.
CALL SCREEN 100.
Scenario 2:
Create a dynamic internal table with the specified number of columns.
Creating Dynamic internal table
TYPE-POOLS: slis.
FIELD-SYMBOLS: <t_dyntable> TYPE STANDARD TABLE, “ Dynamic internal table name
<fs_dyntable>, “ Field symbol to create work area
<fs_fldval> type any. “ Field symbol to assign values
PARAMETERS: p_cols(5) TYPE c. “ Input number of columns
DATA: t_newtable TYPE REF TO data,
t_newline TYPE REF TO data,
t_fldcat TYPE slis_t_fldcat_alv,
t_fldcat TYPE lvc_t_fcat,
wa_it_fldcat TYPE lvc_s_fcat,
wa_colno(2) TYPE n,
wa_flname(5) TYPE c.
* Create fields .
DO p_cols TIMES.
CLEAR wa_it_fldcat.
move sy-index to wa_colno.
concatenate 'COL'
wa_colno
into wa_flname.
wa_it_fldcat-fieldname = wa_flname.
wa_it_fldcat-datatype = 'CHAR'.
wa_it_fldcat-intlen = 10.
APPEND wa_it_fldcat TO t_fldcat.
ENDDO.
* Create dynamic internal table and assign to FS
CALL METHOD cl_alv_table_create=>create_dynamic_table
EXPORTING
it_fieldcatalog = t_fldcat
IMPORTING
ep_table = t_newtable.
ASSIGN t_newtable->* TO <t_dyntable>.
* Create dynamic work area and assign to FS
CREATE DATA t_newline LIKE LINE OF <t_dyntable>.
ASSIGN t_newline->* TO <fs_dyntable>.
Populating Dynamic internal table
DATA: fieldname(20) TYPE c.
DATA: fieldvalue(10) TYPE c.
DATA: index(3) TYPE c.
DO p_cols TIMES.
index = sy-index.
MOVE sy-index TO wa_colno.
CONCATENATE 'COL'
wa_colno
INTO wa_flname.
* Set up fieldvalue
CONCATENATE 'VALUE' index INTO
fieldvalue.
CONDENSE fieldvalue NO-GAPS.
ASSIGN COMPONENT wa_flname
OF STRUCTURE <fs_dyntable> TO <fs_fldval>.
<fs_fldval> = fieldvalue.
ENDDO.
* Append to the dynamic internal table
APPEND <fs_dyntable> TO <t_dyntable>.
Displaying dynamic internal table using Grid.
DATA: wa_cat LIKE LINE OF fs_fldcat.
DO p_cols TIMES.
CLEAR wa_cat.
MOVE sy-index TO wa_colno.
CONCATENATE 'COL'
wa_colno
INTO wa_flname.
wa_cat-fieldname = wa_flname.
wa_cat-seltext_s = wa_flname.
wa_cat-outputlen = '10'.
APPEND wa_cat TO fs_fldcat.
ENDDO.
* Call ABAP List Viewer (ALV)
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
it_fieldcat = fs_fldcat
TABLES
t_outtab = <t_dyntable>.