OAF Help - Locking a Table

I am a newbie in OAF.
We have a OAF page based on a table with some records. If a user click on update button for some record a new page is opened and his "USERNAME" goes to the "LOCKED_BY" column in that table. When user click the save button the records are updated and the lock is released by updating the "LOCKED_BY" column to null.
If another user tries to update the same record for which "LOCKED_BY" column is not null, He gets a message that the 'table is locked by some other user'.
Everything works fine but We need to release lock on this screen as soon as user close screen.
So please suggest me some other technique for locking the table.
Regards,
Gaurav

Please ask this in the {forum:id=210} forum!
Timo

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Help on locking MySQL tables (many can read, but only one can write) Java

Hi there,
I have a question regarding locking of tables so that only one person can write to the file, but many are able to read the files (or tables entities).
I am not sure if I need to lock the tables in my Java code or do I lock the tables within the MySQL syntax. I'm just a little confused on the matter.
This java code is a working prototype of inserting a customer data into the database and that works fine. I just don't know how to implement it so that only one person can update the table at a time.
Here is the Customer.java code that I have written.
Help would be greatly appreciated, thanks so much.
package business;
//~--- non-JDK imports --------------------------------------------------------
import shared.info.CustomerInfo;
//~--- JDK imports ------------------------------------------------------------
import java.sql.*;
* @author
public class Customer {
    static Connection    con = DBConnection.getConnection();
    private CustomerInfo info = new CustomerInfo();
    private String               customerID;
    private String               firstName;
    private String               lastName;
    private String               email;
    private String               addressID;
    private String               homePhone;
    private String               workPhone;
    private String               unitNum;
    private String               streetNum;
    private String               streetName;
    private String               city;
    private String               provinceState;
    private String               country;
    private String               zipPostalCode;
    public Customer(String id) {
        try {
            PreparedStatement pstmt = con.prepareStatement("SELECT * FROM " +
                    "Customer NATURAL JOIN Address WHERE CustomerID = ?");
            pstmt.setString(1, id);
            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                customerID    = rs.getString("CustomerID");
                firstName     = rs.getString("FirstName");
                lastName      = rs.getString("LastName");
                homePhone     = rs.getString("HomePhone");
                workPhone     = rs.getString("WorkPhone");
                email         = rs.getString("Email");
                city          = rs.getString("City");
                provinceState = rs.getString("ProvinceState");
                country       = rs.getString("Country");
                zipPostalCode = rs.getString("ZipPostalCode");
                unitNum       = rs.getString("UnitNum");
                streetNum     = rs.getString("StreetNum");
                streetName    = rs.getString("StreetName");
                addressID     = rs.getString("AddressId");
        } catch (SQLException e) {
            e.printStackTrace();
        info.setCustomerID(customerID);
        info.setFirstName(firstName);
        info.setLastName(lastName);
        info.setHomePhone(homePhone);
        info.setWorkPhone(workPhone);
        info.setEmail(email);
        info.setCity(city);
        info.setProvinceState(provinceState);
        info.setCountry(country);
        info.setZipPostalCode(zipPostalCode);
        info.setUnitNum(unitNum);
        info.setStreetNum(streetNum);
        info.setStreetName(streetName);
        info.setAddressID(addressID);
    public static void addCustomer(CustomerInfo cust) {
        try {
            int id = -1;
            PreparedStatement pstmt = con.prepareStatement("INSERT INTO Address" +
                    "(UnitNum, StreetNum, StreetName, City, ProvinceState, Country," +
                    " ZipPostalCode) VALUES(?, ?, ?, ?, ?, ?, ?)");
            pstmt.setString(1, cust.getUnitNum());
            pstmt.setString(2, cust.getStreetNum());
            pstmt.setString(3, cust.getStreetName());
            pstmt.setString(4, cust.getCity());
            pstmt.setString(5, cust.getProvinceState());
            pstmt.setString(6, cust.getCountry());
            pstmt.setString(7, cust.getZipPostalCode());
            pstmt.executeUpdate();
            ResultSet rs = pstmt.getGeneratedKeys();
            rs.next();
            id = rs.getInt(1);
            pstmt = con.prepareStatement("INSERT INTO Customer" +
                    "(FirstName, LastName, HomePhone, WorkPhone, Email, AddressID)"
                    + "VALUES(?, ?, ?, ?, ?, ?)");
            pstmt.setString(1, cust.getFirstName());
            pstmt.setString(2, cust.getLastName());
            pstmt.setString(3, cust.getHomePhone());
            pstmt.setString(4, cust.getWorkPhone());
            pstmt.setString(5, cust.getEmail());
            pstmt.setInt(6, id);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
    public void setFirstName(String newName) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Customer"
                                          + " SET FirstName = ? WHERE CustomerID = ?");
            pstmt.setString(1, newName);
            pstmt.setString(2, customerID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        firstName = newName;
    public void setLastName(String newName) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Customer"
                                          + " SET LastName = ? WHERE CustomerID = ?");
            pstmt.setString(1, newName);
            pstmt.setString(2, customerID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        lastName = newName;
    public String getFirstName() {
        return firstName;
    public String getLastName() {
        return lastName;
    public void setHomePhone(String number) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Customer"
                                          + " SET HomePhone = ? WHERE CustomerID = ?");
            pstmt.setString(1, number);
            pstmt.setString(2, customerID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        homePhone = number;
    public String getHomePhone() {
        return homePhone;
    public void setWorkPhone(String number) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Customer"
                                          + " SET WorkPhone = ? WHERE CustomerID = ?");
            pstmt.setString(1, number);
            pstmt.setString(2, customerID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        workPhone = number;
    public String getWorkPhone() {
        return workPhone;
    public void setEmail(String email) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Customer" + " SET Email = ? WHERE CustomerID = ?");
            pstmt.setString(1, email);
            pstmt.setString(2, customerID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        this.email = email;
    public String getEmail() {
        return email;
    public void setUnitNum(String num) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Address" + " SET UnitNum = ? WHERE AddressId = ?");
            pstmt.setString(1, num);
            pstmt.setString(2, addressID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        unitNum = num;
    public String getUnitNum() {
        return unitNum;
    public void setCity(String city) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Address" + " SET City = ? WHERE AddressId = ?");
            pstmt.setString(1, city);
            pstmt.setString(2, addressID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        this.city = city;
    public String getCity() {
        return city;
    public void setStreetNum(String num) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Address" + " SET StreetNum = ? WHERE AddressId = ?");
            pstmt.setString(1, num);
            pstmt.setString(2, addressID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        streetNum = num;
    public String getStreetNum() {
        return streetNum;
    public void setStreetName(String name) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Address"
                                          + " SET StreetName = ? WHERE AddressId = ?");
            pstmt.setString(1, name);
            pstmt.setString(2, addressID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        streetName = name;
    public String getStreetName() {
        return streetName;
    public void setZipPostalCode(String code) {
        try {
            PreparedStatement pstmt = con.prepareStatement("UPDATE Address"
                                          + " SET ZipPostalCode = ? WHERE AddressId = ?");
            pstmt.setString(1, code);
            pstmt.setString(2, addressID);
            pstmt.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        zipPostalCode = code;
    public String getZipPostalCode() {
        return zipPostalCode;
    public CustomerInfo getInfo(){
        return info;
    static void deleteCustomer(String customerId) {
        try{
            PreparedStatement pstmt = con.prepareStatement("DELETE FROM Customer" +
                    " WHERE CustomerId = ?");
            pstmt.setString(1, customerId);
            pstmt.executeUpdate();
        }catch(SQLException e){
            e.printStackTrace();
    static void updateCustomer(CustomerInfo custInf) {
        try{
            PreparedStatement pstmt = con.prepareStatement("UPDATE customer" +
                    " SET firstName = ?, SET lastName = ?," +
                    " SET homePhone = ?, SET workPhone = ?, SET email = ?" +
                    " WHERE CustomerId = ?");
            pstmt.setString(1, custInf.getFirstName());
            pstmt.setString(2, custInf.getLastName());
            pstmt.setString(3, custInf.getHomePhone());
            pstmt.setString(4, custInf.getWorkPhone());
            pstmt.setString(5, custInf.getEmail());
            pstmt.setString(6, custInf.getCustomerID());
            pstmt.executeUpdate();
            pstmt = con.prepareStatement("UPDATE address" +
                    " SET unitNum = ?, SET StreetNum = ?, SET StreetName = ?," +
                    " SET city = ?,SET Province = ?,SET country = ?,SET ZipPostalCode = ?" +
                    " WHERE AddressId = ?");
            pstmt.setString(1, custInf.getUnitNum());
            pstmt.setString(2, custInf.getStreetNum());
            pstmt.setString(3, custInf.getStreetName());
            pstmt.setString(4, custInf.getCity());
            pstmt.setString(5, custInf.getProvinceState());
            pstmt.setString(6, custInf.getCountry());
            pstmt.setString(7, custInf.getZipPostalCode());
            pstmt.setString(8, custInf.getAddressID());
            pstmt.executeUpdate();
        }catch(SQLException e){
            e.printStackTrace();
}In addition, here is my customer sql table.
-- Table structure for table `customer`
DROP TABLE IF EXISTS `customer`;
CREATE TABLE `customer` (
`CustomerID` mediumint(9) NOT NULL auto_increment,
`FirstName` varchar(20) NOT NULL,
`LastName` varchar(20) NOT NULL,
`HomePhone` varchar(11) NOT NULL,
`WorkPhone` varchar(11) default NULL,
`Email` varchar(20) NOT NULL,
`AddressID` mediumint(9) default NULL,
PRIMARY KEY (`CustomerID`),
KEY `AddressID` (`AddressID`),
CONSTRAINT `customer_ibfk_1` FOREIGN KEY (`AddressID`) REFERENCES `address` (`AddressID`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
-- Dumping data for table `customer`
LOCK TABLES `customer` WRITE;
/*!40000 ALTER TABLE `customer` DISABLE KEYS */;
/*!40000 ALTER TABLE `customer` ENABLE KEYS */;
UNLOCK TABLES;

to the best of my knowledge, this is something related to the database and not the programming. If you'd want to be the only user to read and edit the table, speicify only one user with that privilege and make it password protected. User must enter the password to write to the tables.

An error occurred in lock management when attempting to set a lock on table

Hi All,
I am getting the error 'An error occurred in lock management when attempting to set a lock on table SWWWIHEAD.'
Sometimes the workitem is not created by the Workflow due to above error & this happens rarely but keeps coming.
cany anyone guide or help me how to correct this problem.Is it happening due to my custom code making locks on the above table?
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Arghadip

Is there any function module to lock t024 table

is there lock object for t024 table?otherwise any fm for locking t024 table?

Hi Naren,
Good ... check out the following documentation
Lock objects are used to lock the database table while making the modifications on the database table.
you can create your own lock objects using SE11.
if you create lock objects on any table system will create two function modules.
1.ENQUEUE....
2.DEQUEUE.....
first one is used to lock the table
second one used to removing lock on the table.
lock Table
CALL FUNCTION 'ENQUEUE_E_TABLE'
EXPORTING
tabname = table_name
EXCEPTIONS
foreign_lock = 1
system_failure = 2
OTHERS = 3.
Unlock Table
CALL FUNCTION 'DEQUEUE_E_TABLE'
EXPORTING
tabname = table_name
check this link :
http://help.sap.com/saphelp_40b/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
_SCOPE = 1: The lock is not sent to the update program. The lock is removed when the transaction is ended.
_SCOPE = 2: The lock is sent to the update program. The update program is responsible for removing the lock. The dialog program which requested the lock no longer has an influence on the lock behavior. This is the standard setting for the ENQUEUE function module.
_SCOPE = 3: The lock
Re: lock objects
Managingin lock entries
http://help.sap.com/saphelp_nw04/helpdata/en/37/a2e3ae344411d3acb00000e83539c3/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/7b/f9813712f7434be10000009b38f8cf/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/cb/168237d30d974be10000009b38f8cf/frameset.htm
Good Luck and thanks
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How to lock a table in a report program

Hi all,
I have a requirement inwhich if i have selected one radio button the table should locked .
and the i need to check wether the table is locked or not by checking the condition.if locked continue else i need to stop.
can any one help me doing this.

Hi,
Hope this information will be useful for you.....
The description of an SAP lock to a table is made via the lock condition and the lock mode.
The lock condition is a logical condition for the lines of the table to be locked. It describes the area of the table which the lock is to protect from competitive access. To avoid the administration of the lock becoming complicated, the lock condition can not be formulated as freely as the WHERE clauses: only fully qualified key fields related by AND may appear in the condition.
Via the lock mode you define which operations on the table are to be protected by the lock. The lock modes available are:
Read lock (shared lock)
protects read access to an object. The read lock allows other transactions read access but not write access to the locked area of the table.
Write lock (exclusive lock)
protects write access to an object. The write lock allows other transactions neither read nor write access to the locked area of the table.
Enhanced write lock (exclusive lock without cumulation)
works like a write lock except that the enhanced write lock also protects from further accesses from the same transaction.
In order to be able to define SAP locks for a table, you must first create a lock object for the table via Development->Dictionary.
If the data for an application object is distributed among several database tables, it is often necessary to be able to lock these tables simultaneously. It is therefore possible to include several tables in a lock object, althought they must be related via appropriate foreign key relationships. The tables involved in a lock object are also known as its base tables.
Thanks
NITESH

DEAD LOCKS on table ARFCSSTATE

Please help!
Essentially the problem is that anything that updates the customer master (T/C BP) causes DEAD LOCKS on table ARFCSSTATE and the queues either slow down terrible or they hang (stop). When one tries to delete an entry in the queue a screen dump takes place DBIF_RSQL_SQL_ERROR in ARFC_RUN.
We are using: CRM 3.0 with the following service packs:
SAP Basis release 610 level 38
SAP ABA Release 50A level 38
BBPCRM Release 300 level 17
Points will be given.
Thank you.

Hi Surendra,
I was expirenced with the error, Basis people had resolved that for me,
better to post this issue to them,
this problem for all data sources or any perticulat data source when scheduling infopackage.
Regards
Vijay

Locking a Table

I just wanted to know , how the lock works on a table. I am very much confused..
Let me put down my requirement...
I am inserting a new record in a Table(Batches) for which one of the columns(no_batch) is an incrementing value. To acheive this, I select the max value of the above column from the same table and add 1 to it.
(Pl note: I cannot use sequence for this
nor I cannot have an UNIQUE constraint on this Column... )
Then I insert this new Record.
The problem what i faced was...
When Multiple users accessed to insert the record at the same time,
Selecting and inserting on the table allowed duplicate values to be inserted on the no_batch column in the batches Table.
Is there any way out to lock the Table exclusively, when a user is accessing this Table until he/she gives a COMMIT or ROLLBACK operation on the Table.
so that the next user should wait for the Resources.
The Time delay is okay for me.
Here is the skeleton of my insert procedure..
PROCEDURE insert_record IS
BEGIN
<set of statements>
SELECT max(no_batch) + 1
into var_no_batch
from batches
where <conditions> ;
insert into batches values
(val1, val2, val3,var_no_batch,........);
commit;
END;
I have an alternative, but I dont know whether this will work out.
Can I give an UPDATE statement which will update 0 rows on the same Table, so that it will be locked, and then, I SELECT and INSERT on the same table, which I guess will work, and a COMMIT will release the LOCK on this Table..
Let me know if this is correct...
This is very urgent.....
Any help and suggestions would be greatly appreciated. and Thanks in Advance..
null

Thanks for your Help and Suggestions...
Sorry,I cannot use a select for update Clause, since the select has an aggregate function.
There are some other procedures which access this Table(only select statements). Will this LOCK stop the other users also who access this Table through the SELECT procedures. Please let me know about that.

Locking a table and then releasing the lock...

Gurus,
I ant to lock a table DMS_LO_CD1 and then do certain upodate and then release the lock after that.
How can I d this ?
Thanks.
Regards,
Rajesh.

http://help.sap.com/saphelp_nw04/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
https://forums.sdn.sap.com/click.jspa?searchID=115258&messageID=2656474
Do the following steps..
GO TO SE11
Select the radio button "Lock object"..
Give the name starts with EZ or EY..
Example: EYTEST
Press Create button..
Give the short description..
Example: Lock object for table ZTABLE..
In the tables tab..Give the table name..
Example: ZTABLE
Save and generate..
Your lock object is now created..You can see the LOCK MODULES..
In the menu ..GOTO -> LOCK MODULES..There you can see the ENQUEUE and DEQUEUE function
Hope this helps.
Regards,
Midhun Abraham

Lock a table with toplink

Hello
I would like to lock a table with a toplink instruction (ie select for update).
How to lock the data ?
Thank in advance.

You can think of using pessimistic locking if you are wanting SELECT for UPDATE.
Following documentation will help you in this regard -
- http://oraclesvca2.oracle.com/docs/cd/B14099_19/web.1012/b15901/dataaccs008.htm
There is a section on pessimistic locking in that URL.

Attach search help to standard table field

Hi,
I need to attach search help to standard table field VBKD-EMPST.
I have create a z search help and taken acess key from SAP.
But unable to attach this to standard table field.
Kindly help.
Moderator message: duplicate post locked.
Edited by: Thomas Zloch on Oct 27, 2010 6:11 PM

Hi,
just go throw this link
Re: Attaching Search Help to a field
I hope this will help u
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Lock a table

I want to lock a table like mara..can u guys tell me how to lock.
Reg'
Zeemaaa...

Hi,
Go to transaction SE11 and enter the table name and there in the Attributes tab
Unselect "Table maintainence allowed" This would avoid the capability to directly update table even if he has access to SE16 and Auth Grp corresponding to that particular table.
Second option is not giving access to SE16 and S_TABU_DIS with ACTVT 02
hope this helps
Manohar

FM to lock the Table

Could anybody check and tell me whether Function Module ENQUEUE_E_TABLE
and DEQUEUE_E_TABLE are working fine and if it is so let me know the Parameters used for it.
Full reward points for issue solver.
Regards,
Amol

hi..
check out the following documentation
Lock objects are used to lock the database table while making the modifications on the database table.
you can create your own lock objects using SE11.
if you create lock objects on any table system will create two function modules.
1.ENQUEUE....
2.DEQUEUE.....
first one is used to lock the table
second one used to removing lock on the table.
lock Table
CALL FUNCTION 'ENQUEUE_E_TABLE'
EXPORTING
tabname = table_name
EXCEPTIONS
foreign_lock = 1
system_failure = 2
OTHERS = 3.
Unlock Table
CALL FUNCTION 'DEQUEUE_E_TABLE'
EXPORTING
tabname = table_name
check this link :
http://help.sap.com/saphelp_40b/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
_SCOPE = 1: The lock is not sent to the update program. The lock is removed when the transaction is ended.
_SCOPE = 2: The lock is sent to the update program. The update program is responsible for removing the lock. The dialog program which requested the lock no longer has an influence on the lock behavior. This is the standard setting for the ENQUEUE function module.
_SCOPE = 3: The lock
Re: lock objects
Managingin lock entries
http://help.sap.com/saphelp_nw04/helpdata/en/37/a2e3ae344411d3acb00000e83539c3/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/7b/f9813712f7434be10000009b38f8cf/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/cb/168237d30d974be10000009b38f8cf/frameset.htm
Reward points if useful
Regards
Ashu

Locking of table record

Hi,
I want to lock particular table record when user click on Update button and unlock when user click on Save Changes button. So that if user updating any record other user should not able to update it.
For this i have used TableLocking's lock method with UserSession lifetime and stateless bean. Its working fine but if user click on update button and then without clicking on Save Changes button if he close the browser, obviously that record will not be unlock. I have to manually unlock that record in doExit method.
Am i doing it write or is there any easy way to do this?
I have also tried to use lifetime as Transaction so that record get unlock automatically as update query fired and its working but record also get unlock if any other query fired like insert or delete as Database tool internally automatically fire the commit command.
So plz suggest batter way to do locking?

Hi Vikram
I'm not sure if I could help you but what we have done in one of our projects is that we have used the enqueue/dequeueu mechanism when using rfc's. So for example:
1. One WebDynpro view where we read data from backend via a rfc call. In that process we do an enqueue so that the records that we read from backend are locked. (Note you can't do a disconnectIfAlive in this step because then the connection with the backend and the lock will be lost)
2. A second WebDynpro view where the user can update the data and save the data via another rfc call. Here we do an dequeue (if the data entered is validated ok) so that the records are unlocked. Here you must do a .disconnectIfAlive() so that the connection with backend is released.
Here is another thread discussing the same subject:
Regards
Göran

How can we lock the table?? how can we lock the record

Hi
how can we lock the complete table?? how can we lock the record ?/
Thanks
Rama

Lock objects are used to lock the database table while making the modifications on the database table.
you can create your own lock objects using SE11.
if you create lock objects on any table system will create two function modules.
1.ENQUEUE....
2.DEQUEUE.....
first one is used to lock the table
second one used to removing lock on the table.
lock Table
CALL FUNCTION 'ENQUEUE_E_TABLE'
EXPORTING
tabname = table_name
EXCEPTIONS
foreign_lock = 1
system_failure = 2
OTHERS = 3.
Unlock Table
CALL FUNCTION 'DEQUEUE_E_TABLE'
EXPORTING
tabname = table_name
check this link :
http://help.sap.com/saphelp_40b/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
_SCOPE = 1: The lock is not sent to the update program. The lock is removed when the transaction is ended.
_SCOPE = 2: The lock is sent to the update program. The update program is responsible for removing the lock. The dialog program which requested the lock no longer has an influence on the lock behavior. This is the standard setting for the ENQUEUE function module.
_SCOPE = 3: The lock
Re: lock objects
Reward if this helps.

Lock custom tables

Hi,
I am writing program to upload data from excel to custom tables.
Here i add/ update/delete records from the table based on entries from excel sheet.
While i run this program, how do i maintain locks on the table, so that any other user is not modifying the tables at the same time.
Points will be awarded immediately.
Thanks

Lock objects are used to lock the database table while making the modifications on the database table.
you can create your own lock objects using SE11.
if you create lock objects on any table system will create two function modules.
1.ENQUEUE....
2.DEQUEUE.....
first one is used to lock the table
second one used to removing lock on the table.
This lock object facilitates synchronous process. That is suppose if you are changing the table entries, and simultaneously there might be several programs running in the background or by anything else which also does changes to the same table. In this case you can lock the table so that other program will not able to update/insert/ do any other operation unless or until your program executes successfully.
You can create lock objects for this purpose in transaction SE11. SAP by default create 2 function modules. One for locking ( Enqueue) and other for unlocking ( Dequeue ). You can call these function module in appropriate places in your program.
ex...
lock Table
CALL FUNCTION 'ENQUEUE_E_TABLE'
EXPORTING
tabname = table_name
EXCEPTIONS
foreign_lock = 1
system_failure = 2
OTHERS = 3.
Unlock Table
CALL FUNCTION 'DEQUEUE_E_TABLE'
EXPORTING
tabname = table_name
check the below links:
http://help.sap.com/saphelp_40b/helpdata/en/cf/21eea5446011d189700000e8322d00/content.htm
Re: lock objects
Regards,
Moqeeth.

OAF Help - Locking a Table

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