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120 wiersze
3.4 KiB
120 wiersze
3.4 KiB
#include <leveldb/db.h>
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#include "leveldb/env.h"
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#include <leveldb/options.h>
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#include <vector>
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#include <string>
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#include <sstream>
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#include <iostream>
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#include "gtest/gtest.h"
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using namespace leveldb;
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using Field = std::pair<std::string, std::string>; // field_name:field_value
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using FieldArray = std::vector<std::pair<std::string, std::string>>;
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// 序列化为字符串
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std::string SerializeValue(const FieldArray& fields) {
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std::ostringstream oss;
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for (const auto& field : fields) {
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oss << field.first << ":" << field.second << ";";
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}
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return oss.str();
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}
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// 反序列化为字段数组
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FieldArray ParseValue(const std::string& value_str) {
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FieldArray fields;
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std::istringstream iss(value_str);
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std::string field_str;
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while (std::getline(iss, field_str, ';')) {
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size_t delimiter_pos = field_str.find(':');
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if (delimiter_pos != std::string::npos) {
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std::string field_name = field_str.substr(0, delimiter_pos);
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std::string field_value = field_str.substr(delimiter_pos + 1);
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fields.emplace_back(field_name, field_value);
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}
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}
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return fields;
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}
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// 根据字段值查找所有包含该字段的 key
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std::vector<std::string> FindKeysByField(leveldb::DB* db, Field &field) {
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std::vector<std::string> keys;
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leveldb::Iterator* it = db->NewIterator(leveldb::ReadOptions());
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for (it->SeekToFirst(); it->Valid(); it->Next()) {
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std::string key = it->key().ToString();
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std::string value;
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db->Get(leveldb::ReadOptions(), key, &value);
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FieldArray fields = ParseValue(value);
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for (const auto& f : fields) {
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if (f.first == field.first && f.second == field.second) {
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keys.push_back(key);
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break; // 假设每个key中每个字段值唯一，如果允许重复，可以移除这行
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}
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}
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}
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delete it;
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return keys;
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}
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Status OpenDB(std::string dbName, DB **db) {
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Options options;
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options.create_if_missing = true;
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return DB::Open(options, dbName, db);
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}
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TEST(TestSchema, Basic) {
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DB *db;
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WriteOptions writeOptions;
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ReadOptions readOptions;
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if(OpenDB("testdb", &db).ok() == false) {
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std::cerr << "open db failed" << std::endl;
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abort();
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}
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std::string key1 = "k_1";
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std::string key2 = "k_2";
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FieldArray fields1 = {
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{"name", "Customer#000000001"},
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{"address", "IVhzIApeRb"},
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{"phone", "25-989-741-2988"}
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};
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FieldArray fields2 = {
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{"name", "Customer#000000001"},
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{"address", "ecnu"},
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{"phone", "123456789"}
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};
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// 序列化并插入
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std::string value1 = SerializeValue(fields1);
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std::string value2 = SerializeValue(fields2);
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db->Put(leveldb::WriteOptions(), key1, value1);
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db->Put(leveldb::WriteOptions(), key2, value2);
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// 读取并反序列化
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std::string value_ret;
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db->Get(leveldb::ReadOptions(), key1, &value_ret);
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auto fields_ret = ParseValue(value_ret);
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// 检查反序列化结果
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ASSERT_EQ(fields_ret.size(), fields1.size());
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for (size_t i = 0; i < fields_ret.size(); ++i) {
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ASSERT_EQ(fields_ret[i].first, fields1[i].first);
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ASSERT_EQ(fields_ret[i].second, fields1[i].second);
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}
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// 测试查找功能
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Field query_field = {"name", "Customer#000000001"};
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std::vector<std::string> found_keys = FindKeysByField(db, query_field);
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std::cout << "找到的key有：" << found_keys.size() << "个" << std::endl;
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ASSERT_EQ(found_keys[0], key1);
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// 关闭数据库
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delete db;
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}
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int main(int argc, char **argv) {
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testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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