Created by Jerry Wang, last modified on May 21, 2014
如下report 先后三次重复调用带参数的enqueue function module对database table CRMD_SOC_POST里一个uuid为0023的record上锁, 使用Function module ENQUEUE_READ读取该user持有的sap lock信息,打印出的cumulative counter的值依次为1, 2, 3. 每调用一次对应的dequeue function module,则counter 减1。
若不带参数调用enqueue function module,则cumulative counter与待参数时调用的counter是分别计数的。
REPORT zlock1.
CONSTANTS: c_table TYPE tadir-obj_name VALUE 'CRMD_SOC_POST'.
START-OF-SELECTION.
WRITE: / 'First lock on uuid 23...' COLOR COL_NEGATIVE.
CALL FUNCTION 'ENQUEUE_ECRMD_SOC_POST'
EXPORTING
uuid = '00000000000000000000000000000023'.
PERFORM display_lock.
WRITE: / 'Second lock on uuid 23...' COLOR COL_NEGATIVE.
CALL FUNCTION 'ENQUEUE_ECRMD_SOC_POST'
EXPORTING
uuid = '00000000000000000000000000000023'.
PERFORM display_lock.
WRITE: / 'Third lock on the whole table...' COLOR COL_NEGATIVE.
CALL FUNCTION 'ENQUEUE_ECRMD_SOC_POST'.
PERFORM display_lock.
WRITE: / 'Third lock on uuid 23...' COLOR COL_NEGATIVE.
CALL FUNCTION 'ENQUEUE_ECRMD_SOC_POST'
EXPORTING
uuid = '00000000000000000000000000000023'.
PERFORM display_lock.
WRITE: / 'release lock on uuid 23...' COLOR COL_NEGATIVE.
CALL FUNCTION 'DEQUEUE_ECRMD_SOC_POST'
EXPORTING
uuid = '00000000000000000000000000000023'.
PERFORM display_lock.
FORM display_lock.
DATA: lv_subrc TYPE sy-subrc,
lt_enq TYPE STANDARD TABLE OF seqg3.
CLEAR: lt_enq.
CALL FUNCTION 'ENQUEUE_READ'
EXPORTING
gclient = sy-mandt
guname = sy-uname
IMPORTING
subrc = lv_subrc
TABLES
enq = lt_enq
EXCEPTIONS
communication_failure = 2
OTHERS = 1.
LOOP AT lt_enq ASSIGNING FIELD-SYMBOL(<lock>) WHERE gname = c_table.
WRITE: / 'lock variable: ' , <lock>-garg+0(40) COLOR COL_POSITIVE,
'Cumulative Counter: ', <lock>-gusevb COLOR COL_TOTAL.
ENDLOOP.
ENDFORM.