通过对SAP锁机制的了解，相信大家都比较关心这锁机制是如何运用的，下面是周末研究的过程，现在记录下来方便大家，也方便自己了！
1） SE11 创建锁，锁对象名必须以EZ或者EY开始：
2）点击创建进入锁对象维护，并设置相关信息如下：
以上就基本设置完，下面通过编写程序测试，代码如下：
*&---------------------------------------------------------------------*
*& Report ZTEST_LOCK
*&
*&---------------------------------------------------------------------*
*& CREATE BY : FLYING
*& CREATE DATE : 2009-11-14
*& DECRIPTIONS : 测试SAP的锁机制
*&---------------------------------------------------------------------*
REPORT ztest_lock.
TABLES: sscrfields.
*----------------------------------------------------------------------*
* define internal table
* 定义内表
*
*----------------------------------------------------------------------*
DATA: t_eban TYPE zteban OCCURS 0 WITH HEADER LINE,
w_eban LIKE t_eban.
*----------------------------------------------------------------------*
* defin avirable
* 定义变量
*
*----------------------------------------------------------------------*
DATA: ok_code TYPE sy-ucomm, "获得按钮功能码
save_ok TYPE sy-ucomm. "临时存储功能码
DATA: flag TYPE i. "用于标记处理模式是修改还是显示
*----------------------------------------------------------------------*
* selection-screen
* 选择屏幕
*
*---------------------------------------------------------------------*
SELECTION-SCREEN BEGIN OF BLOCK blk WITH FRAME TITLE text-001.
PARAMETERS: p_banfn LIKE eban-banfn.
SELECTION-SCREEN END OF BLOCK blk.
SELECTION-SCREEN FUNCTION KEY 1. "添加屏幕按钮
SELECTION-SCREEN FUNCTION KEY 2. "添加屏幕按钮
*---------------------------------------------------------------------*
* initialization
* 初始化选择屏幕
*
*---------------------------------------------------------------------*
INITIALIZATION.
sscrfields-functxt_01 = '修改'. "设置屏幕显示文本
sscrfields-functxt_02 = '显示'.
CLEAR flag.
*---------------------------------------------------------------------*
* at selection-screen
* 处理选择屏幕的按钮
*
*---------------------------------------------------------------------*
AT SELECTION-SCREEN.
CASE sy-ucomm. "选择屏幕按钮
WHEN 'FC01'.
flag = 1.
PERFORM frm_get_data.
WHEN 'FC02'.
flag = 0.
PERFORM frm_get_data.
ENDCASE.
*---------------------------------------------------------------------*
* frm_get_data
* 根据选择条件取数据
*
*---------------------------------------------------------------------*
FORM frm_get_data.
SELECT banfn
bnfpo
matnr
ekgrp
INTO CORRESPONDING FIELDS OF TABLE t_eban
FROM eban
WHERE banfn = p_banfn.
IF t_eban[] IS INITIAL.
MESSAGE '没有可查询的数据' TYPE 'I'.
STOP.
ELSE.
IF flag = 1.
PERFORM frm_set_lock.
ENDIF.
CALL SCREEN 1001.
ENDIF.
ENDFORM. "frm_get_data
*---------------------------------------------------------------------*
* frm_set_lock
* 设置锁
*
*--------------------------------------------------------------------*
FORM frm_set_lock.
CALL FUNCTION 'ENQUEUE_EZEBAN'
EXPORTING
mode_zteban = 'E'
mandt = sy-mandt
banfn = p_banfn.
IF sy-subrc <> 0.
STOP.
ENDIF.
ENDFORM. "frm_set_lock
*----------------------------------------------------------*
* frm_delete_lock
* 删除锁
*
*----------------------------------------------------------*
FORM frm_delete_lock.
CALL FUNCTION 'DEQUEUE_EZEBAN'
EXPORTING
mode_zteban = 'E'
mandt = sy-mandt
banfn = p_banfn
x_banfn = ' '
.
ENDFORM. "frm_delete_lock
*&SPWIZARD: DECLARATION OF TABLECONTROL 'TAB1' ITSELF
CONTROLS: tab1 TYPE TABLEVIEW USING SCREEN 1001.
*&SPWIZARD: OUTPUT MODULE FOR TC 'TAB1'. DO NOT CHANGE THIS LINE!
*&SPWIZARD: UPDATE LINES FOR EQUIVALENT SCROLLBAR
MODULE tab1_change_tc_attr OUTPUT.
DESCRIBE TABLE t_eban LINES tab1-lines.
ENDMODULE. "TAB1_CHANGE_TC_ATTR OUTPUT
*&SPWIZARD: INPUT MODULE FOR TC 'TAB1'. DO NOT CHANGE THIS LINE!
*&SPWIZARD: MODIFY TABLE
MODULE tab1_modify INPUT.
MODIFY t_eban
INDEX tab1-current_line.
ENDMODULE. "TAB1_MODIFY INPUT
*&---------------------------------------------------------------------*
*& Module STATUS_1001 OUTPUT
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
MODULE status_1001 OUTPUT.
* SET PF-STATUS 'xxxxxxxx'.
* SET TITLEBAR 'xxx'.
SET PF-STATUS 'STAT_1001'.
ENDMODULE. " STATUS_1001 OUTPUT
*&---------------------------------------------------------------------*
*& Module USER_COMMAND_1001 INPUT
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
MODULE user_command_1001 INPUT.
save_ok = ok_code.
CLEAR ok_code.
CASE save_ok.
WHEN 'BACK'.
perform frm_delete_lock.
LEAVE TO SCREEN 0.
WHEN 'EXIT'.
PERFORM frm_delete_lock.
LEAVE PROGRAM.
ENDCASE.
ENDMODULE. " USER_COMMAND_1001 INPUT
*&---------------------------------------------------------------------*
*& Module SET_READ_LINE OUTPUT
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
MODULE set_read_line OUTPUT. "设置表格的行项目不可编辑
IF flag = 0.
LOOP AT SCREEN.
IF screen-name = 'T_EBAN-BANFN'.
screen-input = '0'.
ENDIF.
IF screen-name = 'T_EBAN-BNFPO'.
screen-input = '0'.
ENDIF.
IF screen-name = 'T_EBAN-MATNR'.
screen-input = '0'.
ENDIF.
IF screen-name = 'T_EBAN-EKGRP'.
screen-input = '0'.
ENDIF.
MODIFY SCREEN.
ENDLOOP.
ENDIF.
ENDMODULE. " SET_READ_LINE OUTPUT
测试效果如下所示：
