【轉載】SAP儲存操作記錄CDHDR和CDPOS表，通過修改螢幕欄位，查詢SAP欄位表和欄位
sap的欄位和物件的修改都會儲存舊值，資料儲存在CDHDR和CDPOS表中，提取舊值可以採用兩種方法
這兩個表，第一個表類似於表頭（HEADER），第二個是具體內容（ITEM）
通過表CDHDR的欄位tcode，可以找到指定事務的所有更改記錄（更改的T-CODE），如事務：MM02，找到的記錄中的OBJECTID就是存放物料ID，然後根據記錄到表到CDPOS就可以查詢到具體哪些欄位的值發生變化，而且還記錄了欄位發生前後的值
TABLENAME 和 FNAME 可以記錄具體的表的具體的欄位的更改的記錄。也通過這種方法修改欄位，可以找表和欄位。tabname = 'LFBK' fname = 'KOINH'.
1) 使用sap的標準函式CHANGEDOCUMENT_READ_HEADERS 和CHANGEDOCUMENT_READ_POSITIONS
CALL FUNCTION 'CHANGEDOCUMENT_READ_POSITIONS' "Change document: Read change document items
EXPORTING
*archive_handle = 0" sy-tabixHandle on Open Archive Files
changenumber =" cdpos-changenrChange document number
*tablekey = SPACE" cdpos-tabkeyObject class table key
*tablename = SPACE" cdpos-tabnameObject class table name
*tablekey254 = SPACE" cdpos_uid-tabkeyTable Key for CDPOS in Character 254
*keyguid = SPACE" cdpos_uid-keyguidUUID in Character Format
*keyguid_str = SPACE" cdpos_str-keyguidUUID in Character Format
IMPORTING
header =" cdhdrChange document header (structure CDHDR)
et_cdred_str =" cdred_str_tabAdditional Change Document - Table for STRINGs
* TABLES
*editpos =" cdshwTable with edited change document items
EDITPOS_WITH_HEADER = "CDRED更改文件,顯示結構
EXCEPTIONS
NO_POSITION_FOUND = 1"No item foun
WRONG_ACCESS_TO_ARCHIVE = 2"incorrect access to archive
2)使用select語句直接從表中讀取。
直接使用SELECT語句讀取資料的示例：
*提取信用額度欄位修改的擡頭資訊 select cdhdr~changenr cdhdr~udate cdhdr~utime into corresponding fields of table p_cdhdr from cdhdr where cdhdr~objectclas = 'KLIM' and cdhdr~objectid = wa_customerinfo-kunnr. if sy-subrc = 0.
*提取信用額度欄位修改的欄位值 select cdpos~changenr cdpos~value_old cdpos~value_new into corresponding fields of table p_cdpos from cdpos for all entries in p_cdhdr where cdpos~objectclas = 'KLIM' and cdpos~objectid = wa_customerinfo-kunnr and cdpos~changenr = p_cdhdr-changenr and cdpos~tabname = 'KNKK' and cdpos~fname = 'KLIMK'. if sy-subrc = 0. endif. endif.
可以在CHANGEDOCUMENT_READ_HEADERS 中設定中斷獲得物件型別。
ex.
提取有變動的 Acc. changes
SELECT SINGLE tabkey value_new INTO (cdpos-tabkey,ikoinh)
FROM cdpos
WHERE objectclas = 'KRED'
AND objectid = itab-lifnr
AND changenr = itab-changenr
AND tabname = 'LFBK'
AND fname = 'KOINH'.
提取有變動的vendor最新日期
SELECT MAX( udate ) INTO itab-cndate FROM cdhdr
WHERE objectclas = 'KRED' AND objectid = itab-lifnr.
--------------------------------------------------------------------------------
抓取所有有變動的程式
report ztest001.
TYPE-POOLS slis.
DATA : cdhdr TYPE cdhdr.
SELECT-OPTIONS :
s_objcls FOR cdhdr-objectclas OBLIGATORY,
s_objtid FOR cdhdr-objectid,
s_chngnr FOR cdhdr-changenr,
s_usrnam FOR cdhdr-username DEFAULT sy-uname,
s_udate FOR cdhdr-udate DEFAULT sy-datum,
s_time FOR cdhdr-utime,
s_tcode FOR cdhdr-tcode,
s_plncnr FOR cdhdr-planchngnr,
s_chngno FOR cdhdr-act_chngno,
s_wsplnd FOR cdhdr-was_plannd,
s_chngid FOR cdhdr-change_ind.
SELECTION-SCREEN SKIP.
PARAMETERS p_max TYPE numc3 OBLIGATORY DEFAULT '200'.
*---------------------------------------------------------------------*
TYPES :
BEGIN OF ty_s_cdhdr.
INCLUDE STRUCTURE cdhdr.
TYPES : checkbox,
END OF ty_s_cdhdr,
BEGIN OF ty_s_cdpos.
INCLUDE STRUCTURE cdpos.
TYPES : checkbox,
END OF ty_s_cdpos.
*---------------------------------------------------------------------*
DATA :
* Layout for ALV
gs_layout TYPE slis_layout_alv,
* Change document header
t_cdhdr TYPE TABLE OF ty_s_cdhdr.
*---------------------------------------------------------------------*
START-OF-SELECTION.
* Read Change document header
SELECT * INTO TABLE t_cdhdr
UP TO p_max ROWS
FROM cdhdr
WHERE objectclas IN s_objcls
and objectid in s_objtid
and changenr in s_chngnr
AND username IN s_usrnam
AND udate IN s_udate
AND utime IN s_time
AND tcode IN s_tcode
AND planchngnr IN s_plncnr
AND act_chngno IN s_chngno
AND was_plannd IN s_wsplnd
AND change_ind IN s_chngid.
gs_layout-zebra = 'X'.
gs_layout-colwidth_optimize = 'X'.
gs_layout-box_fieldname = 'CHECKBOX'.
* Display ALV