Import changeset

bdb/examples_cxx/EnvExample.cpp

@@ -0,0 +1,122 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1997, 1998, 1999, 2000
+ *	Sleepycat Software.  All rights reserved.
+ *
+ * $Id: EnvExample.cpp,v 11.12 2000/10/27 20:32:00 dda Exp $
+ */
+
+#include "db_config.h"
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <errno.h>
+#include <iostream.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#endif
+
+#include <db_cxx.h>
+
+#ifdef macintosh
+#define	DATABASE_HOME	":database"
+#define	CONFIG_DATA_DIR	":database"
+#else
+#ifdef DB_WIN32
+#define	DATABASE_HOME	"\\tmp\\database"
+#define	CONFIG_DATA_DIR	"\\database\\files"
+#else
+#define	DATABASE_HOME	"/tmp/database"
+#define	CONFIG_DATA_DIR	"/database/files"
+#endif
+#endif
+
+void	db_setup(char *, char *, ostream&);
+void	db_teardown(char *, char *, ostream&);
+
+char *progname = "EnvExample";			/* Program name. */
+
+//
+// An example of a program creating/configuring a Berkeley DB environment.
+//
+int
+main(int, char **)
+{
+	//
+	// Note: it may be easiest to put all Berkeley DB operations in a
+	// try block, as seen here.  Alternatively, you can change the
+	// ErrorModel in the DbEnv so that exceptions are never thrown
+	// and check error returns from all methods.
+	//
+	try {
+		char *data_dir, *home;
+
+		//
+		// All of the shared database files live in /home/database,
+		// but data files live in /database.
+		//
+		home = DATABASE_HOME;
+		data_dir = CONFIG_DATA_DIR;
+
+		cout << "Setup env\n";
+		db_setup(DATABASE_HOME, data_dir, cerr);
+
+		cout << "Teardown env\n";
+		db_teardown(DATABASE_HOME, data_dir, cerr);
+		return 0;
+	}
+	catch (DbException &dbe) {
+		cerr << "AccessExample: " << dbe.what() << "\n";
+		return 1;
+	}
+}
+
+// Note that any of the db calls can throw DbException
+void
+db_setup(char *home, char *data_dir, ostream& err_stream)
+{
+	//
+	// Create an environment object and initialize it for error
+	// reporting.
+	//
+	DbEnv *dbenv = new DbEnv(0);
+	dbenv->set_error_stream(&err_stream);
+	dbenv->set_errpfx(progname);
+
+	//
+	// We want to specify the shared memory buffer pool cachesize,
+	// but everything else is the default.
+	//
+	dbenv->set_cachesize(0, 64 * 1024, 0);
+
+	// Databases are in a subdirectory.
+	(void)dbenv->set_data_dir(data_dir);
+
+	// Open the environment with full transactional support.
+	dbenv->open(DATABASE_HOME,
+    DB_CREATE | DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_MPOOL | DB_INIT_TXN, 0);
+
+	// Do something interesting...
+
+	// Close the handle.
+	dbenv->close(0);
+}
+
+void
+db_teardown(char *home, char *data_dir, ostream& err_stream)
+{
+	// Remove the shared database regions.
+	DbEnv *dbenv = new DbEnv(0);
+
+	dbenv->set_error_stream(&err_stream);
+	dbenv->set_errpfx(progname);
+
+	(void)dbenv->set_data_dir(data_dir);
+	dbenv->remove(home, 0);
+	delete dbenv;
+}