Home
SQL programmingYou can use the HCL OneDB™ implementation of the SQL language to develop applications for database servers.
Guide to SQL: TutorialThe HCL OneDB™ Guide to SQL: Tutorial shows how to use basic and advanced structured query language (SQL) to access and manipulate the data in your databases. It discusses the data manipulation language (DML) statements as well as triggers and stored procedure language (SPL) routines, which DML statements often use.
Programming for a multiuser environment
Set the lock mode
Waiting for locks

Waiting for locks

When a user encounters a lock, the default behavior of a database server is to return an error to the application. If you prefer to wait indefinitely for a lock (this choice is best for many applications), you can execute the following SQL statement:

SET LOCK MODE TO WAIT

When this lock mode is set, your program usually ignores the existence of other concurrent programs. When your program needs to access a row that another program has locked, it waits until the lock is removed, then proceeds. In most cases, the delays are imperceptible.

You can also wait for a specific number of seconds, as in the following example:

SET LOCK MODE TO WAIT 20