mtest2.c (3486B)
1 /* mtest2.c - memory-mapped database tester/toy */ 2 /* 3 * Copyright 2011-2021 Howard Chu, Symas Corp. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted only as authorized by the OpenLDAP 8 * Public License. 9 * 10 * A copy of this license is available in the file LICENSE in the 11 * top-level directory of the distribution or, alternatively, at 12 * <http://www.OpenLDAP.org/license.html>. 13 */ 14 15 /* Just like mtest.c, but using a subDB instead of the main DB */ 16 17 #include <stdio.h> 18 #include <stdlib.h> 19 #include <time.h> 20 #include "lmdb.h" 21 22 #define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr) 23 #define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0)) 24 #define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \ 25 "%s:%d: %s: %s\n", __FILE__, __LINE__, msg, mdb_strerror(rc)), abort())) 26 27 int main(int argc,char * argv[]) 28 { 29 int i = 0, j = 0, rc; 30 MDB_env *env; 31 MDB_dbi dbi; 32 MDB_val key, data; 33 MDB_txn *txn; 34 MDB_stat mst; 35 MDB_cursor *cursor; 36 int count; 37 int *values; 38 char sval[32] = ""; 39 40 srand(time(NULL)); 41 42 count = (rand()%384) + 64; 43 values = (int *)malloc(count*sizeof(int)); 44 45 for(i = 0;i<count;i++) { 46 values[i] = rand()%1024; 47 } 48 49 E(mdb_env_create(&env)); 50 E(mdb_env_set_maxreaders(env, 1)); 51 E(mdb_env_set_mapsize(env, 10485760)); 52 E(mdb_env_set_maxdbs(env, 4)); 53 E(mdb_env_open(env, "./testdb", MDB_FIXEDMAP|MDB_NOSYNC, 0664)); 54 55 E(mdb_txn_begin(env, NULL, 0, &txn)); 56 E(mdb_dbi_open(txn, "id1", MDB_CREATE, &dbi)); 57 58 key.mv_size = sizeof(int); 59 key.mv_data = sval; 60 61 printf("Adding %d values\n", count); 62 for (i=0;i<count;i++) { 63 sprintf(sval, "%03x %d foo bar", values[i], values[i]); 64 data.mv_size = sizeof(sval); 65 data.mv_data = sval; 66 if (RES(MDB_KEYEXIST, mdb_put(txn, dbi, &key, &data, MDB_NOOVERWRITE))) 67 j++; 68 } 69 if (j) printf("%d duplicates skipped\n", j); 70 E(mdb_txn_commit(txn)); 71 E(mdb_env_stat(env, &mst)); 72 73 E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn)); 74 E(mdb_cursor_open(txn, dbi, &cursor)); 75 while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) { 76 printf("key: %p %.*s, data: %p %.*s\n", 77 key.mv_data, (int) key.mv_size, (char *) key.mv_data, 78 data.mv_data, (int) data.mv_size, (char *) data.mv_data); 79 } 80 CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get"); 81 mdb_cursor_close(cursor); 82 mdb_txn_abort(txn); 83 84 j=0; 85 key.mv_data = sval; 86 for (i= count - 1; i > -1; i-= (rand()%5)) { 87 j++; 88 txn=NULL; 89 E(mdb_txn_begin(env, NULL, 0, &txn)); 90 sprintf(sval, "%03x ", values[i]); 91 if (RES(MDB_NOTFOUND, mdb_del(txn, dbi, &key, NULL))) { 92 j--; 93 mdb_txn_abort(txn); 94 } else { 95 E(mdb_txn_commit(txn)); 96 } 97 } 98 free(values); 99 printf("Deleted %d values\n", j); 100 101 E(mdb_env_stat(env, &mst)); 102 E(mdb_txn_begin(env, NULL, MDB_RDONLY, &txn)); 103 E(mdb_cursor_open(txn, dbi, &cursor)); 104 printf("Cursor next\n"); 105 while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_NEXT)) == 0) { 106 printf("key: %.*s, data: %.*s\n", 107 (int) key.mv_size, (char *) key.mv_data, 108 (int) data.mv_size, (char *) data.mv_data); 109 } 110 CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get"); 111 printf("Cursor prev\n"); 112 while ((rc = mdb_cursor_get(cursor, &key, &data, MDB_PREV)) == 0) { 113 printf("key: %.*s, data: %.*s\n", 114 (int) key.mv_size, (char *) key.mv_data, 115 (int) data.mv_size, (char *) data.mv_data); 116 } 117 CHECK(rc == MDB_NOTFOUND, "mdb_cursor_get"); 118 mdb_cursor_close(cursor); 119 mdb_txn_abort(txn); 120 121 mdb_dbi_close(env, dbi); 122 mdb_env_close(env); 123 return 0; 124 }