Import changeset

bdb/examples_cxx/AccessExample.cpp

@@ -0,0 +1,151 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1997, 1998, 1999, 2000
+ *	Sleepycat Software.  All rights reserved.
+ *
+ * $Id: AccessExample.cpp,v 11.7 2000/12/06 18:58:23 bostic Exp $
+ */
+
+#include "db_config.h"
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <iostream.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#ifndef _MSC_VER
+#include <unistd.h>
+#endif
+#endif
+
+#include <iomanip.h>
+#include <db_cxx.h>
+
+class AccessExample
+{
+public:
+	AccessExample();
+	void run();
+
+private:
+	static const char FileName[];
+
+	// no need for copy and assignment
+	AccessExample(const AccessExample &);
+	void operator = (const AccessExample &);
+};
+
+static void usage();          // forward
+
+int main(int argc, char *argv[])
+{
+	if (argc > 1) {
+		usage();
+	}
+
+	// Use a try block just to report any errors.
+	// An alternate approach to using exceptions is to
+	// use error models (see DbEnv::set_error_model()) so
+	// that error codes are returned for all Berkeley DB methods.
+	//
+	try {
+		AccessExample app;
+		app.run();
+		return 0;
+	}
+	catch (DbException &dbe) {
+		cerr << "AccessExample: " << dbe.what() << "\n";
+		return 1;
+	}
+}
+
+static void usage()
+{
+	cerr << "usage: AccessExample\n";
+	exit(1);
+}
+
+const char AccessExample::FileName[] = "access.db";
+
+AccessExample::AccessExample()
+{
+}
+
+void AccessExample::run()
+{
+	// Remove the previous database.
+	(void)unlink(FileName);
+
+	// Create the database object.
+	// There is no environment for this simple example.
+	Db db(0, 0);
+
+	db.set_error_stream(&cerr);
+	db.set_errpfx("AccessExample");
+	db.set_pagesize(1024);		/* Page size: 1K. */
+	db.set_cachesize(0, 32 * 1024, 0);
+	db.open(FileName, NULL, DB_BTREE, DB_CREATE, 0664);
+
+	//
+	// Insert records into the database, where the key is the user
+	// input and the data is the user input in reverse order.
+	//
+	char buf[1024];
+	char rbuf[1024];
+	char *t;
+	char *p;
+	int ret;
+	int len;
+
+	for (;;) {
+		cout << "input> ";
+		cout.flush();
+
+		cin.getline(buf, sizeof(buf));
+		if (cin.eof())
+			break;
+
+		if ((len = strlen(buf)) <= 0)
+			continue;
+		for (t = rbuf, p = buf + (len - 1); p >= buf;)
+			*t++ = *p--;
+		*t++ = '\0';
+
+		Dbt key(buf, len + 1);
+		Dbt data(rbuf, len + 1);
+
+		ret = db.put(0, &key, &data, DB_NOOVERWRITE);
+		if (ret == DB_KEYEXIST) {
+			cout << "Key " << buf << " already exists.\n";
+		}
+	}
+	cout << "\n";
+
+	// We put a try block around this section of code
+	// to ensure that our database is properly closed
+	// in the event of an error.
+	//
+	try {
+		// Acquire a cursor for the table.
+		Dbc *dbcp;
+		db.cursor(NULL, &dbcp, 0);
+
+		// Walk through the table, printing the key/data pairs.
+		Dbt key;
+		Dbt data;
+		while (dbcp->get(&key, &data, DB_NEXT) == 0) {
+			char *key_string = (char *)key.get_data();
+			char *data_string = (char *)data.get_data();
+			cout << key_string << " : " << data_string << "\n";
+		}
+		dbcp->close();
+	}
+	catch (DbException &dbe) {
+		cerr << "AccessExample: " << dbe.what() << "\n";
+	}
+
+	db.close(0);
+}