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153 lines
3.6 KiB
153 lines
3.6 KiB
#include "leveldb/db.h"
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#include <iostream>
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using namespace std;
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using namespace leveldb;
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int test1() {
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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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Status status = DB::Open(op, "testdb1", &db);
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assert(status.ok());
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db->Put(WriteOptions(), "001", "leveldb");
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string s;
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db->Get(ReadOptions(), "001", &s);
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cout<<s<<endl;
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cout << s.size() << endl;
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db->Put(WriteOptions(), "002", "world");
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string s1;
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db->Delete(WriteOptions(), "002"); // sc: {0, 33}
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db->Get(ReadOptions(), "002", &s1);
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cout << s1.size() << endl;
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cout<<s1<<endl;
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delete db;
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return 0;
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}
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int test2() {
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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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Status status = DB::Open(op, "testdb2", &db);
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assert(status.ok());
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const std::string value_prefix = "value_";
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const size_t loop_times = 1000000;
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int k = 0;
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for (auto i = 0; i < loop_times; i++) {
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if (i == 220) {
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k ++;
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}
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auto key = std::to_string(i);
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auto value = value_prefix + key;
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db->Put(WriteOptions(), key, value);
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string s;
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db->Get(ReadOptions(), key, &s);
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cout << s << " | " << s.size() << endl;
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}
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cout << endl << "all put are done" << endl << endl;
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for (auto i = 0; i < loop_times; i++) {
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auto key = std::to_string(i);
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auto value = value_prefix + key;
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// db->Put(WriteOptions(), key, value+"_");
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string s1;
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db->Delete(WriteOptions(), key); // sc: {0, 33}
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db->Get(ReadOptions(), key, &s1);
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cout << s1 << " | " << s1.size() << " | " << i << endl;
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}
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delete db;
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std::cout << "db has been deleted!" << std::endl;
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return 0;
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}
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int test3() {
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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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Status status = DB::Open(op, "testdb2", &db);
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assert(status.ok());
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const std::string value_prefix = "value_";
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const size_t loop_times = 10;
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for (auto i = 0; i < loop_times; i++) {
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auto key = std::to_string(i);
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auto value = value_prefix + key;
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db->Put(WriteOptions(), key, value);
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string s;
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db->Get(ReadOptions(), key, &s);
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cout << s << " | " << s.size() << endl;
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}
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// cout << endl << "all put are done" << endl << endl;
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//
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// for (auto i = 0; i < loop_times; i++) {
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// auto key = std::to_string(i);
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// auto value = value_prefix + key;
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//
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// // db->Put(WriteOptions(), key, value+"_");
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// string s1;
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// db->Delete(WriteOptions(), key); // sc: {0, 33}
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// db->Get(ReadOptions(), key, &s1);
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// cout << s1 << " | " << s1.size() << " | " << i << endl;
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// }
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delete db;
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std::cout << "db has been deleted!" << std::endl;
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return 0;
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}
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int test4() {
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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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Status status = DB::Open(op, "testdb2", &db);
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assert(status.ok());
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const std::string value_prefix = "value_";
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const size_t loop_times = 10;
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// for (auto i = 0; i < loop_times; i++) {
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// auto key = std::to_string(i);
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// auto value = value_prefix + key;
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// db->Put(WriteOptions(), key, value);
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// string s;
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// db->Get(ReadOptions(), key, &s);
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// cout << s << " | " << s.size() << endl;
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//
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// }
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// cout << endl << "all put are done" << endl << endl;
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for (auto i = 0; i < loop_times; i++) {
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auto key = std::to_string(i);
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auto value = value_prefix + key;
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// db->Put(WriteOptions(), key, value+"_");
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string s1;
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db->Delete(WriteOptions(), key); // sc: {0, 33}
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db->Get(ReadOptions(), key, &s1);
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cout << s1 << " | " << s1.size() << " | " << i << endl;
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}
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delete db;
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std::cout << "db has been deleted!" << std::endl;
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return 0;
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}
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int main() {
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// test3();
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// std::cout << std::endl << std::endl;
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// test4();
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test2();
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}
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