berkdb.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Sun, 24 Oct 2010 20:58:01 +0200
changeset 151 a8c2649cf277
parent 147 f9015072361f
permissions -rw-r--r--
FileTraverser Demo added Proper handling of symlinks in java apps committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * berkdb.c (C) 2010 Markus Bröker
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 *
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <limits.h>
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#include <db.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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DBT key;
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DBT data;
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/* initialize the db library and open a db file */
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DB *dbinit (DB * db, char *filename)
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{
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    int ret;
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    printf ("Initializing berkley db...\n");
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    if ((ret = db_create (&db, NULL, 0)) != 0) {
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        perror ("db_create");
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        return NULL;
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    }
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    bzero (&key, sizeof (key));
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    bzero (&data, sizeof (data));
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    printf ("Opening berkdb.db flat database file...\n");
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    if ((ret = db->open (db, NULL, filename, NULL, DB_BTREE, DB_CREATE, 0)) != 0) {
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        perror ("db->open");
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        return NULL;
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    }
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    return db;
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}
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/* insert a key/value pair into the database */
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int dbinsert (DB * db, int id, char *description)
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{
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    key.data = &id;
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    key.size = sizeof (int);
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    data.data = description;
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    data.size = strlen (description) + 1;
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    return db->put (db, NULL, &key, &data, DB_NOOVERWRITE);
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}
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/* get the associated value from the database for the key 'id' */
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char *dbget (DB * db, int id)
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{
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    key.data = &id;
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    key.size = sizeof (int);
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    if (db->get (db, NULL, &key, &data, 0) == 0)
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        return (char *)data.data;
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    return NULL;
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}
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/* iterate over the db and print all values */
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void dblist (DB * db)
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{
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    int ret;
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    DBC *dbc;
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    if (db->cursor (db, NULL, &dbc, 0) != 0) {
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        perror ("db->cursor");
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        return;
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    }
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    bzero (&key, sizeof (key));
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    while ((ret = dbc->get (dbc, &key, &data, DB_NEXT)) == 0) {
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        printf ("KEY[%02d] => %s\n", *(int *)key.data, (char *)data.data);
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    }
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    if (dbc != NULL) {
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        dbc->close (dbc);
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    } else
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        perror ("dbc");
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}
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/* close the db */
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int dbclose (DB * db)
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{
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    if (db != NULL) {
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        printf ("Closing berkley db file...\n");
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        return db->close (db, 0);
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    }
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    return EXIT_FAILURE;
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}
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int main (int argc, char **argv)
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{
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    char description[80];
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    int id;
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    DB *db = NULL;
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    if ((db = dbinit (db, "berkdb.db")) == NULL)
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        return EXIT_FAILURE;
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    for (id = 0; id < 100; id++) {
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        sprintf (description, "This is value %d", id);
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        switch (dbinsert (db, id, description)) {
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        case 0:
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            printf ("KEY ADDED\n");
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            break;
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        case DB_KEYEXIST:
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            printf ("DUPLICATE KEY %d\n", id);
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            break;
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        default:
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            printf ("Error while storing primary key %d\n", id);
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        }
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    }
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    char *value;
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    for (id = 0; id < 10; id++) {
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        if ((value = dbget (db, id)) != NULL)
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            printf ("DB: %s\n", value);
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    }
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    dblist (db);
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    return dbclose (db);
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}