Close frees the resources associated with driver.  This also happens when the resources are freed via garbage collection; however, you can call Close to release the resources immediately.

Any descendant modules of driver are closed when driver is closed.  (A module is a descendant of driver if it is returned by one of driver's exports or is a descendant of one of driver's descendants.)

$\mathrm{driver}≔\mathrm{Database}\left[\mathrm{LoadDriver}\right]\left('\mathrm{driver}'=''com.database.Driver''\,'\mathrm{classpath}'=''/path/to/jar/jdbc.jar''\right)\:$

$\mathrm{conn}≔\mathrm{driver}:-\mathrm{OpenConnection}\left(''jdbc:dbdriver://localhost/DBName''\,''user1''\,''passwd''\,'\mathrm{isolation}'='\mathrm{serializable}'\right)\:$

$\mathrm{driver}:-\mathrm{Close}\left(\right)$

$\mathrm{conn}:-\mathrm{ExecuteQuery}\left(''SELECT\; *\; FROM\; datatable''\right)$

$\mathrm{conn}≔\mathrm{driver}:-\mathrm{OpenConnection}\left(''jdbc:dbdriver://localhost/DBName''\,''user1''\,''passwd''\,'\mathrm{isolation}'='\mathrm{serializable}'\right)$