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86 行
2.6 KiB
86 行
2.6 KiB
#include "leveldb/db.h"
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#include "leveldb/options.h"
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#include "util/random.h"
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#include <bits/stdc++.h>
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#include <string>
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using namespace std;
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using namespace leveldb;
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int main() {
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DB* db = nullptr;
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Options op;
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op.create_if_missing = true;
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DestroyDB("testdb_kv", Options());
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Status status = DB::Open(op, "testdb_kv", &db);
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// assert(status.ok());
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// string key = "leveldb",value = to_string(0);
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// string res;
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// for(int i = 0; i < 5; i++) {
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// db->Put(WriteOptions(),key,to_string(i));
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// }
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// db->Put(WriteOptions(),key+key,to_string(0));
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// db->Put(WriteOptions(),key+key,to_string(1));
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// sleep(1);
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// auto snapshot = db->GetSnapshot();
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// auto readopts = ReadOptions();
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// readopts.snapshot = snapshot;
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// db->Put(WriteOptions(),key,to_string(10));
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// db->CompactRange(nullptr,nullptr);
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// db->Get(readopts,key,&res);
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// cout<<"with snapshot:"<<res<<endl;
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// res.clear();
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// db->Get(ReadOptions(),key,&res);
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// cout<<"without snapshot:"<<res<<endl;
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// string value = "leveldb",key = "abc";
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// db->Delete(WriteOptions(),key);
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// db->Put(WriteOptions(),key,value);
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// const Snapshot *snapshot = db->GetSnapshot();
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// ReadOptions read_op = ReadOptions();
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// read_op.snapshot = snapshot;
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// string result;
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// db->Get(read_op,key,&result);
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// cout<<result<<endl;
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// db->Delete(WriteOptions(),key);
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// result.clear();
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// db->Get(read_op,key,&result);
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// cout<<"with snapshot:"<<result<<endl;
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// result.clear();
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// db->Get(ReadOptions(),key,&result);
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// cout<<"without snapshot:"<<result<<endl;
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// db->ReleaseSnapshot(snapshot);
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string key,value = "leveldb";
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key.resize(1000,'a');
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// value.resize(10,'b');
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value += "index";
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Random ran(0);
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for(int i = 0; i < 100000; i++) {
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for(int j = 0; j < 20; j++) {
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int rand = ran.Uniform(200 * 10);
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string tk = key + std::to_string(rand);
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string tv = value + std::to_string(rand) + "_" + std::to_string(i);
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db->Put(WriteOptions(),tk,tv);
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}
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if(i && i%1000 ==0) {
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std::cout << "iteration:" << i << std::endl;
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}
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}
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std::string res;
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for(int i = 0; i < 10; i++) {
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db->Get(ReadOptions(), key + std::to_string(i), &res);
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std::cout << i << " " << res << std::endl;
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}
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delete db;
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// DB::Open(op,"testdb",&db);
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// key = "abc", value = "";
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// db->Get(ReadOptions(),key,&value);
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// cout<<value;
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// // DestroyDB("testdb",op);
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// delete db;
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return 0;
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}
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