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