m4_comment([$Id: dbenv_cxx.so,v 11.10 2000/12/01 17:59:32 bostic Exp $])m4_ref_title(Upgrading m4_db Applications,    Release 3.0: the DbEnv class for C++ and Java,,    upgrade.3.0/value_set, upgrade.3.0/db_cxx)m4_p([dnlThe DbEnv::appinit() method and two constructors for the DbEnv class aregone.  There is now a single way to create and initialize the environment.The way to create an environment is to use the new DbEnv constructor withone argument.  After this call, the DbEnv can be configured with variousset_XXX methods.  Finally, a call to DbEnv::open is made to initializethe environment.])m4_p([dnlHere's a C++ example creating a m4_db environment using the 2.X interface])m4_indent([dnlint dberr;DbEnv *dbenv = new DbEnv();m4_blankdbenv-__GT__set_error_stream(&cerr);dbenv-__GT__set_errpfx("myprog");m4_blankif ((dberr = dbenv-__GT__appinit("/database/home",	NULL, DB_CREATE | DB_INIT_LOCK | DB_INIT_MPOOL)) != 0) {    cerr __LT____LT__ "failure: " __LT____LT__ strerror(dberr);    exit (1);}])m4_p([dnlIn the m4_db 3.0 release, this code would be written as:])m4_indent([dnlint dberr;DbEnv *dbenv = new DbEnv(0);m4_blankdbenv-__GT__set_error_stream(&cerr);dbenv-__GT__set_errpfx("myprog");m4_blankif ((dberr = dbenv-__GT__open("/database/home",	NULL, DB_CREATE | DB_INIT_LOCK | DB_INIT_MPOOL, 0)) != 0) {    cerr __LT____LT__ "failure: " __LT____LT__ dbenv-__GT__strerror(dberr);    exit (1);}])m4_p([dnlHere's a Java example creating a m4_db environment using the 2.X interface:])m4_indent([dnlint dberr;DbEnv dbenv = new DbEnv();m4_blankdbenv.set_error_stream(System.err);dbenv.set_errpfx("myprog");m4_blankdbenv.appinit("/database/home",    null, Db.DB_CREATE | Db.DB_INIT_LOCK | Db.DB_INIT_MPOOL);])m4_p([dnlIn the m4_db 3.0 release, this code would be written as:])m4_indent([dnlint dberr;DbEnv dbenv = new DbEnv(0);m4_blankdbenv.set_error_stream(System.err);dbenv.set_errpfx("myprog");m4_blankdbenv.open("/database/home",    null, Db.DB_CREATE | Db.DB_INIT_LOCK | Db.DB_INIT_MPOOL, 0);])m4_p([dnlIn the m4_db 2.X release, DbEnv had accessors to obtain "managers" of typeDbTxnMgr, DbMpool, DbLog, DbTxnMgr.  If you used any of these managers,all their methods are now found directly in the DbEnv class.])m4_page_footer