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Diffstat (limited to 'bdb/examples_cxx/BtRecExample.cpp')
| -rw-r--r-- | bdb/examples_cxx/BtRecExample.cpp | 224 |
1 files changed, 0 insertions, 224 deletions
diff --git a/bdb/examples_cxx/BtRecExample.cpp b/bdb/examples_cxx/BtRecExample.cpp deleted file mode 100644 index b56c3fe5837..00000000000 --- a/bdb/examples_cxx/BtRecExample.cpp +++ /dev/null @@ -1,224 +0,0 @@ -/*- - * See the file LICENSE for redistribution information. - * - * Copyright (c) 1997-2002 - * Sleepycat Software. All rights reserved. - * - * $Id: BtRecExample.cpp,v 11.21 2002/01/23 15:33:20 bostic Exp $ - */ - -#include <sys/types.h> - -#include <errno.h> -#include <iostream> -#include <iomanip> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include <db_cxx.h> - -using std::cout; -using std::cerr; - -#define DATABASE "access.db" -#define WORDLIST "../test/wordlist" - -const char *progname = "BtRecExample"; // Program name. - -class BtRecExample -{ -public: - BtRecExample(FILE *fp); - ~BtRecExample(); - void run(); - void stats(); - void show(const char *msg, Dbt *key, Dbt *data); - -private: - Db *dbp; - Dbc *dbcp; -}; - -BtRecExample::BtRecExample(FILE *fp) -{ - char *p, *t, buf[1024], rbuf[1024]; - int ret; - - // Remove the previous database. - (void)remove(DATABASE); - - dbp = new Db(NULL, 0); - - dbp->set_error_stream(&cerr); - dbp->set_errpfx(progname); - dbp->set_pagesize(1024); // 1K page sizes. - - dbp->set_flags(DB_RECNUM); // Record numbers. - dbp->open(NULL, DATABASE, NULL, DB_BTREE, DB_CREATE, 0664); - - // - // Insert records into the database, where the key is the word - // preceded by its record number, and the data is the same, but - // in reverse order. - // - - for (int cnt = 1; cnt <= 1000; ++cnt) { - (void)sprintf(buf, "%04d_", cnt); - if (fgets(buf + 4, sizeof(buf) - 4, fp) == NULL) - break; - u_int32_t len = strlen(buf); - buf[len - 1] = '\0'; - for (t = rbuf, p = buf + (len - 2); p >= buf;) - *t++ = *p--; - *t++ = '\0'; - - // As a convenience for printing, we include the null terminator - // in the stored data. - // - Dbt key(buf, len); - Dbt data(rbuf, len); - - if ((ret = dbp->put(NULL, &key, &data, DB_NOOVERWRITE)) != 0) { - dbp->err(ret, "Db::put"); - if (ret != DB_KEYEXIST) - throw DbException(ret); - } - } -} - -BtRecExample::~BtRecExample() -{ - if (dbcp != 0) - dbcp->close(); - dbp->close(0); - delete dbp; -} - -// -// Print out the number of records in the database. -// -void BtRecExample::stats() -{ - DB_BTREE_STAT *statp; - - dbp->stat(&statp, 0); - cout << progname << ": database contains " - << (u_long)statp->bt_ndata << " records\n"; - - // Note: must use free, not delete. - // This struct is allocated by C. - // - free(statp); -} - -void BtRecExample::run() -{ - db_recno_t recno; - int ret; - char buf[1024]; - - // Acquire a cursor for the database. - dbp->cursor(NULL, &dbcp, 0); - - // - // Prompt the user for a record number, then retrieve and display - // that record. - // - for (;;) { - // Get a record number. - cout << "recno #> "; - cout.flush(); - if (fgets(buf, sizeof(buf), stdin) == NULL) - break; - recno = atoi(buf); - - // - // Start with a fresh key each time, - // the dbp->get() routine returns - // the key and data pair, not just the key! - // - Dbt key(&recno, sizeof(recno)); - Dbt data; - - if ((ret = dbcp->get(&key, &data, DB_SET_RECNO)) != 0) { - dbp->err(ret, "DBcursor->get"); - throw DbException(ret); - } - - // Display the key and data. - show("k/d\t", &key, &data); - - // Move the cursor a record forward. - if ((ret = dbcp->get(&key, &data, DB_NEXT)) != 0) { - dbp->err(ret, "DBcursor->get"); - throw DbException(ret); - } - - // Display the key and data. - show("next\t", &key, &data); - - // - // Retrieve the record number for the following record into - // local memory. - // - data.set_data(&recno); - data.set_size(sizeof(recno)); - data.set_ulen(sizeof(recno)); - data.set_flags(data.get_flags() | DB_DBT_USERMEM); - - if ((ret = dbcp->get(&key, &data, DB_GET_RECNO)) != 0) { - if (ret != DB_NOTFOUND && ret != DB_KEYEMPTY) { - dbp->err(ret, "DBcursor->get"); - throw DbException(ret); - } - } - else { - cout << "retrieved recno: " << (u_long)recno << "\n"; - } - } - - dbcp->close(); - dbcp = NULL; -} - -// -// show -- -// Display a key/data pair. -// -void BtRecExample::show(const char *msg, Dbt *key, Dbt *data) -{ - cout << msg << (char *)key->get_data() - << " : " << (char *)data->get_data() << "\n"; -} - -int -main() -{ - FILE *fp; - - // Open the word database. - if ((fp = fopen(WORDLIST, "r")) == NULL) { - fprintf(stderr, "%s: open %s: %s\n", - progname, WORDLIST, db_strerror(errno)); - return (EXIT_FAILURE); - } - - try { - BtRecExample app(fp); - - // Close the word database. - (void)fclose(fp); - fp = NULL; - - app.stats(); - app.run(); - } - catch (DbException &dbe) { - cerr << "Exception: " << dbe.what() << "\n"; - return (EXIT_FAILURE); - } - - return (EXIT_SUCCESS); -} |