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mdbx: fix tutorial/sample-mdbx.c

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Fix/refine b0dc98bec0

Change-Id: Ie5b1cf9453261c5e1cdfc4880ce9dafdcc4545f7
This commit is contained in:
Leo Yuriev
2017-08-16 09:04:33 +03:00
parent b0dc98bec0
commit 276e3578da
2 changed files with 40 additions and 17 deletions
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55
tutorial/sample-mdbx.c
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@@ -20,17 +20,18 @@
#include "mdbx.h"
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[]) {
(void)argc;
(void)argv;
int rc;
MDBX_env *env;
MDBX_dbi dbi;
MDBX_env *env = NULL;
MDBX_dbi dbi = 0;
MDBX_val key, data;
MDBX_txn *txn;
MDBX_cursor *cursor;
MDBX_txn *txn = NULL;
MDBX_cursor *cursor = NULL;
char sval[32];
rc = mdbx_env_create(&env);
@@ -41,20 +42,19 @@ int main(int argc, char *argv[]) {
rc = mdbx_env_open(env, "./example-db",
MDBX_NOSUBDIR | MDBX_COALESCE | MDBX_LIFORECLAIM, 0664);
if (rc != MDBX_SUCCESS) {
mdbx_env_close(env);
fprintf(stderr, "mdbx_env_open: (%d) %s\n", rc, mdbx_strerror(rc));
return 0;
goto bailout;
}
rc = mdbx_txn_begin(env, NULL, 0, &txn);
if (rc != MDBX_SUCCESS) {
fprintf(stderr, "mdbx_txn_begin: (%d) %s\n", rc, mdbx_strerror(rc));
goto leave;
goto bailout;
}
rc = mdbx_dbi_open(txn, NULL, 0, &dbi);
if (rc != MDBX_SUCCESS) {
fprintf(stderr, "mdbx_dbi_open: (%d) %s\n", rc, mdbx_strerror(rc));
goto leave;
goto bailout;
}
key.iov_len = sizeof(int);
@@ -66,24 +66,47 @@ int main(int argc, char *argv[]) {
rc = mdbx_put(txn, dbi, &key, &data, 0);
if (rc != MDBX_SUCCESS) {
fprintf(stderr, "mdbx_put: (%d) %s\n", rc, mdbx_strerror(rc));
goto leave;
goto bailout;
}
rc = mdbx_txn_commit(txn);
if (rc) {
fprintf(stderr, "mdbx_txn_commit: (%d) %s\n", rc, mdbx_strerror(rc));
goto leave;
goto bailout;
}
txn = NULL;
rc = mdbx_txn_begin(env, NULL, MDBX_RDONLY, &txn);
if (rc != MDBX_SUCCESS) {
fprintf(stderr, "mdbx_txn_begin: (%d) %s\n", rc, mdbx_strerror(rc));
goto bailout;
}
rc = mdbx_cursor_open(txn, dbi, &cursor);
if (rc != MDBX_SUCCESS) {
fprintf(stderr, "mdbx_cursor_open: (%d) %s\n", rc, mdbx_strerror(rc));
goto bailout;
}
int found = 0;
while ((rc = mdbx_cursor_get(cursor, &key, &data, MDBX_NEXT)) == 0) {
printf("key: %p %.*s, data: %p %.*s\n", key.iov_base, (int)key.iov_len,
(char *)key.iov_base, data.iov_base, (int)data.iov_len,
(char *)data.iov_base);
found += 1;
}
mdbx_cursor_close(cursor);
mdbx_txn_abort(txn);
leave:
mdbx_dbi_close(env, dbi);
mdbx_env_close(env);
return 0;
if (rc != MDBX_NOTFOUND || found == 0) {
fprintf(stderr, "mdbx_cursor_get: (%d) %s\n", rc, mdbx_strerror(rc));
goto bailout;
} else {
rc = MDBX_SUCCESS;
}
bailout:
if (cursor)
mdbx_cursor_close(cursor);
if (txn)
mdbx_txn_abort(txn);
if (dbi)
mdbx_dbi_close(env, dbi);
if (env)
mdbx_env_close(env);
return (rc != MDBX_SUCCESS) ? EXIT_FAILURE : EXIT_SUCCESS;
}