63 lines
1.6 KiB
C++
63 lines
1.6 KiB
C++
#include "../lmdb-safe.hh"
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#include <unistd.h>
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using namespace std;
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using namespace LMDBSafe;
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int main()
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{
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unlink("./multi");
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auto env = getMDBEnv("multi", MDB_NOSUBDIR, 0600);
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auto dbi = env->openDB("qnames", MDB_DUPSORT | MDB_CREATE);
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auto txn = env->getRWTransaction();
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txn->clear(dbi);
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txn->put(dbi, "bdb", "old");
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txn->put(dbi, "lmdb", "hot");
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txn->put(dbi, "lmdb", "fast");
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txn->put(dbi, "lmdb", "zooms");
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txn->put(dbi, "lmdb", "c");
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txn->put(dbi, "mdb", "old name");
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string_view v1;
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if(!txn->get(dbi, "mdb", v1)) {
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cout<<v1<<endl;
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}
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else {
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cout << "found nothing" << endl;
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}
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txn->commit();
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txn = env->getRWTransaction();
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auto cursor = txn->getRWCursor(dbi);
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MDBOutVal key, data;
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for(int rc = cursor.find("lmdb", key, data); !rc; rc = cursor.get(key, data, MDB_NEXT_DUP)) {
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cout << key.get<string_view>() << " = " << data.get<string_view>() <<endl;
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}
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cout<<"Dump of complete database: "<<endl;
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for(int rc = cursor.first(key, data); !rc; rc = cursor.next(key, data)) {
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cout << key.get<string_view>() << " = " << data.get<string_view>() <<endl;
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}
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cout << "Done!" <<endl;
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cout << "Now going to delete 'lmdb' keys" << endl;
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for(int rc = cursor.first(key, data); !rc; rc = cursor.next(key, data)) {
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if(key.get<string_view>() == "lmdb")
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cursor.del();
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}
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cout <<"Complete database after deleting 'lmdb' keys: " << endl;
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for(int rc = cursor.first(key, data); !rc; rc = cursor.next(key, data)) {
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cout << key.get<string_view>() << " = " << data.get<string_view>() <<endl;
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}
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}
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