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SAP Database Locking

SAP provides you with the ability to restrict access to data while the table is being updated. Thisis fairly simple to implement via the use of a lock object (Created in SE11).

Step 1 - Create Lock object (SE11)

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Step 2 - ABAP code to lock table entriesAdd the following code in-order to create the table lock. This function module must be calledbefore any update takes place. If a lock has already been taken out it will display the appropriatemessage.

CALL FUNCTION 'ENQUEUE_EZ_ZTABLENAME'

EXPORTINGmode_ZTABLENAME = 'E' "E = Write Lock, S = Read Lock, X =Exclusive not cumulative

mandt = sy-mandtKEYFIELD1 = "ValueKEYFIELD2 = "ValueKEYFIELD3 = "Value

...* X_KEYFIELD1 = ' '* X_KEYFIELD2 = ' '* X_KEYFIELD3 = ' '

...* _SCOPE = '2'* _WAIT = ' '

* _COLLECT = ' '* If exceptions are not used, message is displayed within FM

EXCEPTIONSFOREIGN_LOCK = 1SYSTEM_FAILURE = 2OTHERS = 3.

IF sy-subrc 0.* Retrieve message displayed within Function Module

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message id sy-msgidtype 'I'number sy-msgnowith sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.

***************OPTIONAL - Get more details of existing lock* Also within here you can also use ENQUEUE_READ to find out more detailsabout the existing lock

data: it_enq type STANDARD TABLE OF SEQG3,wa_enq like line of it_enq,ld_gname type SEQG3-GNAME,ld_garg type SEQG3-GARG,

ld_gname = 'ZTABLENAME'. "This is the name of the lock object as shown intcode SM12

CALL FUNCTION 'ENQUEUE_READ'EXPORTINGGCLIENT = SY-MANDTGNAME = ld_gname "Lock opject nameGUNAME = '*' "User name, default is SY-UNAME but

need to use * to return locks for all usersTABLESENQ = it_enq

EXCEPTIONSCOMMUNICATION_FAILURE = 1SYSTEM_FAILURE = 2OTHERS = 3.

"will need to check values returned by FM to check what values are neededto build ld_garg value

concatenate sy-mandt KEYFIELD1 KEYFIELD2 KEYFIELD3 into ld_garg .loop at it_enq into wa_enq where garg cs ld_garg.exit.

endloop.check sy-subrc eq 0.if wa_enq-guname eq sy-uname."Entry already being updated by you

else."Entry already being updated by someone else

endif.***************OPTIONAL

EXIT.ENDIF.

Step 3 - ABAP code to Remove table lock(s)The following code will remove the lock for the specific table entries.

CALL FUNCTION 'DEQUEUE_EZ_ZTABLENAME'EXPORTING

MODE_ZTABLENAME = 'E'MANDT = SY-MANDTmandt = sy-mandtKEYFIELD1 = "ValueKEYFIELD2 = "ValueKEYFIELD3 = "Value

...

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* X_KEYFIELD1 = ' '* X_KEYFIELD2 = ' '* X_KEYFIELD3 = ' '

...* _SCOPE = '3'* _SYNCHRON = ' '* _COLLECT = ' '

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