今天早上对BDC程序做了初步的研究，对BDC程序的基本结构做了如下的总结。
TABLES:VBRK.
DATA:BEGIN OF GT_VBRK OCCURS 0.
VBLEN LIKE VBRK-VBLEN,
.......
END OF GT_VBRK.
DATA:I_BDCTAB LIKE BDCDATA OCCURS 0 WITH HEADER LINE.
DATA:MESSTAB LIKE BDCMSGCOLL OCCURS 0 WITH HEADER LINE.
START-OF-SELECTION.
PERFORM UPLOAD_DATA.
PERFORM PROCESS_DATA.
PERFORM INSERT_BDCDATA.
FORM UPLOAD_DATA.
PARAMETERS: IN_FILE LIKE RLGRAP-FILENAME.
CALL FUNCTION 'TB_LIMIT_WS_FILENAME_GET'.
CALL FUNCTION 'GUI_UPLOAD'.
ENDFORM.
FORM PROCESS_DATA.
MAIN USED TO CONVERT DATA TYPE.
ENDFORM.
FORM INSERT_DATA.
PERFORM OPEN_GROUP
PERFORM BDC_DYNPRO USING .....
......
PERFORM BDC_FIELD USING.....
......
PERFORM TRANSACTION USING 'T-CODE'
'MODE'
MESSAGES INTO MESSTAB.
PERFORM CLOSE_GROUP.
ENDFORM.
FORM BDC_DYNPRO USING PROGRAM
DYNPRO.
*该FORM由SAP自动生成
CLEAR I_DBCTAB-PROGRAM .
I_BDCTAB-PROGRAM = PROGRAM.
I_BDCTAB-DYNPRO = DYNPRO.
I_BDCTAB-DYNBEGIN = 'X'.
APPEND I_BDCTAB.
ENDFORM.
FORM BDC_FIELD USING FNAM FVAL.
*该FORM由SAP自动生成
CLEAR I_BDCTAB-FNAM .
I_BDCTAB-FNAM = FNAM.
I_BDCTAB-FVAL = FVAL.
APPEND I_BDCTAB.
ENDFORM.
这里面包括了BDC程序的主要部分，可以根据需要丰富其中的内容。
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