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43 lines
1.2 KiB
43 lines
1.2 KiB
#include <cassert>
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#include <iostream>
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#include "leveldb/db.h"
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#include "db/db_impl.h"
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int main() {
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leveldb::DB* db;
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leveldb::Options options;
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options.create_if_missing = true;
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options.kvSepType = leveldb::kVSepBeforeMem;
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leveldb::Status status = leveldb::DB::Open(options, "/tmp/testdb", &db);
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if (!status.ok()) {
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std::cerr << "Failed to open DB: " << status.ToString() << '\n';
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return 1;
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}
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// 使用 dynamic_cast 将基类指针转换为 DBImpl
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auto* dbimpl = static_cast<leveldb::DBImpl*>(db);
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if (dbimpl == nullptr) {
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std::cerr << "Failed to cast to DBImpl\n";
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delete db;
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return 1;
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}
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status = dbimpl->Put(leveldb::WriteOptions(), "key1", "val1");
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if (status.ok()) {
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std::string val;
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status = dbimpl->Get(leveldb::ReadOptions(), "key1", &val);
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std::cout << "Find value of 'key1' From db: " << val << "\n";
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}
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if (status.ok()) {
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std::string val;
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dbimpl->Delete(leveldb::WriteOptions(), "key1");
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status = dbimpl->Get(leveldb::ReadOptions(), "key1", &val);
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// Not found.
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std::cout << status.ToString() << '\n';
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}
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delete db;
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return 0;
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}
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