除了數(shù)據(jù)庫有鎖定外，ABAP程序本身也有鎖定。

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SAP提供了兩個函數(shù)來解決程序運行時的同步鎖定問題：ENQUEUE_ES_PROG和DEQUEUE_ES_PROG。

CALL?FUNCTION?'ENQUEUE_ES_PROG'
* EXPORTING
*?? MODE_TRDIR?????????? = 'E'
*?? NAME???????????????? =
*?? X_NAME?????????????? = ' '
*?? _SCOPE?????????????? = '2'
*?? _WAIT??????????????? = ' '
*?? _COLLECT???????????? = ' '
* EXCEPTIONS
*?? FOREIGN_LOCK???????? = 1
*?? SYSTEM_FAILURE?????? = 2
*?? OTHERS?????????????? = 3
????????? .
Prevents the parallel execution of a program.可防止程序的并行執(zhí)行。

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Description

This function creates a lock in a program that should not be processed more than once, simultaneously.該加鎖函數(shù)會在程序里創(chuàng)建一把鎖阻止同一時間只有一個運行。

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The lock remains in place until either the DEQUEUE_ES_PROG function module

is called or the transaction is completed (with an implicit DEQUEUE_ALL call).

Parameters該鎖會保持直到DEQUEUE_ES_PROG函數(shù)調(diào)用，或者事務(wù)（程序）執(zhí)行完畢（執(zhí)行完畢后會隱式調(diào)用DEQUEUE_ALL）才會釋放

EXPORTING輸出參數(shù)

NAME?Program name to lock需上鎖的程序名

_SCOPE?Controls how the lock is passed to the update program:鎖的傳播特性？？

Value Meaning

1?The lock is not passed to the update program. The lock

is removed when the transaction ends.

2?(default) The lock is passed to the update program. The update

program is responsible for removing the lock.

3?The lock is passed to the update program. The lock must

be removed in both the interactive(交互) program and in the

update program.

CALL?FUNCTION?'DEQUEUE_ES_PROG'
* EXPORTING
*?? MODE_TRDIR?????? = 'E'
*?? NAME???????????? =
*?? X_NAME?????????? = ' '
*?? _SCOPE?????????? = '3'
*?? _SYNCHRON??????? = ' '
*?? _COLLECT???????? = ' '
????????? .

該函數(shù)釋放由ENQUEUE_ES_PROG.設(shè)置的程序鎖

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使用時需要注意下列問題：

1、??ENQUEUE_ES_PROG函數(shù)只是嘗試去鎖定，如果鎖已經(jīng)被其他程序獲取，并不會阻塞，要在調(diào)用后通過sy-subrc來判斷是否獲取成功。可以在循環(huán)里通過? WAIT? UP TO xx SECONDS.??語句來等待鎖被獲取到

2、??ABAP工作臺開發(fā)程序時，不能同時編輯同一個程序，第一個打開程序的用戶會上程序鎖，程序鎖可以使用SM12來查看當(dāng)前的程序鎖，如現(xiàn)在編輯z_jzj_program_lock程序時：

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