Add serialize test by binary aerialization

test/Serialize_test.cc

@@ -0,0 +1,155 @@
+#include "leveldb/db.h"
+#include <iostream>
+#include <sstream>
+#include <vector>
+#include <string>
+#include <cassert>
+
+using namespace std;
+using namespace leveldb;
+
+// 定义字段类型别名
+using Field = std::pair<std::string, std::string>;
+using FieldArray = std::vector<Field>;
+
+// 二进制序列化函数
+std::string SerializeValue(const FieldArray& fields) {
+    std::ostringstream oss;
+    uint32_t num_fields = fields.size();
+    
+    // 写入字段数量
+    oss.write(reinterpret_cast<const char*>(&num_fields), sizeof(num_fields));
+
+    // 写入每个字段的长度和内容
+    for (const auto& field : fields) {
+        uint32_t name_length = field.first.size();
+        uint32_t value_length = field.second.size();
+        
+        // 写入字段名长度和字段名
+        oss.write(reinterpret_cast<const char*>(&name_length), sizeof(name_length));
+        oss.write(field.first.data(), name_length);
+
+        // 写入字段值长度和字段值
+        oss.write(reinterpret_cast<const char*>(&value_length), sizeof(value_length));
+        oss.write(field.second.data(), value_length);
+    }
+
+    return oss.str();
+}
+
+// 二进制反序列化函数
+FieldArray ParseValue(const std::string& value_str) {
+    FieldArray fields;
+    std::istringstream iss(value_str);
+
+    uint32_t num_fields = 0;
+    iss.read(reinterpret_cast<char*>(&num_fields), sizeof(num_fields)); // 读取字段数量
+
+    for (uint32_t i = 0; i < num_fields; ++i) {
+        uint32_t name_length = 0, value_length = 0;
+        
+        // 读取字段名长度和字段名
+        iss.read(reinterpret_cast<char*>(&name_length), sizeof(name_length));
+        std::string field_name(name_length, '\0');
+        iss.read(&field_name[0], name_length);
+
+        // 读取字段值长度和字段值
+        iss.read(reinterpret_cast<char*>(&value_length), sizeof(value_length));
+        std::string field_value(value_length, '\0');
+        iss.read(&field_value[0], value_length);
+
+        fields.emplace_back(field_name, field_value);
+    }
+
+    return fields;
+}
+
+// 查询函数：根据字段查找所有包含该字段的 Key
+std::vector<std::string> FindKeysByField(leveldb::DB* db, const Field& field) {
+    std::vector<std::string> keys;
+    Iterator* it = db->NewIterator(ReadOptions());
+
+    for (it->SeekToFirst(); it->Valid(); it->Next()) {
+        std::string key = it->key().ToString();
+        std::string value = it->value().ToString();
+
+        FieldArray fields = ParseValue(value);
+
+        // 查找是否有匹配的字段
+        for (const auto& f : fields) {
+            if (f.first == field.first && f.second == field.second) {
+                keys.push_back(key);
+                break;
+            }
+        }
+    }
+
+    delete it;
+    return keys;
+}
+
+int main() {
+    // 创建 LevelDB 数据库
+    DB* db = nullptr;
+    Options op;
+    op.create_if_missing = true;
+    Status status = DB::Open(op, "testdb", &db);
+    assert(status.ok());
+
+    // 插入两条数据，包含多个字段
+    FieldArray fields1 = {
+        {"name", "Customer#000000001"},
+        {"address", "IVhzIApeRb"},
+        {"phone", "25-989-741-2988"}
+    };
+    db->Put(WriteOptions(), "k_1", SerializeValue(fields1));
+
+    FieldArray fields2 = {
+        {"name", "Customer#000000002"},
+        {"address", "N3qjPOETGc"},
+        {"phone", "12-345-678-9012"}
+    };
+    db->Put(WriteOptions(), "k_2", SerializeValue(fields2));
+
+    // 插入带有特殊字符的字段
+    FieldArray fields3 = {
+        {"name", "Customer=000000003"},
+        {"address", "N3qj;POETGc"},
+        {"phone", "12-345-678-9012"}
+    };
+    db->Put(WriteOptions(), "k_3", SerializeValue(fields3));
+
+    // 读取并反序列化数据
+    string value_ret1, value_ret2, value_ret3;
+    db->Get(ReadOptions(), "k_1", &value_ret1);
+    db->Get(ReadOptions(), "k_2", &value_ret2);
+    db->Get(ReadOptions(), "k_3", &value_ret3);
+
+    cout << "Deserialized fields for key k_1:" << endl;
+    for (const auto& field : ParseValue(value_ret1)) {
+        cout << field.first << ": " << field.second << endl;
+    }
+
+    cout << "\nDeserialized fields for key k_2:" << endl;
+    for (const auto& field : ParseValue(value_ret2)) {
+        cout << field.first << ": " << field.second << endl;
+    }
+
+    cout << "\nDeserialized fields for key k_3:" << endl;
+    for (const auto& field : ParseValue(value_ret3)) {
+        cout << field.first << ": " << field.second << endl;
+    }
+
+    // 查询功能测试：查找所有 name = "Customer#000000001" 的 key
+    Field search_field = {"name", "Customer#000000001"};
+    auto keys = FindKeysByField(db, search_field);
+
+    // 输出查询结果
+    cout << "\nFound keys for field " << search_field.first << " = " << search_field.second << ":" << endl;
+    for (const auto& key : keys) {
+        cout << key << endl;
+    }
+
+    delete db;
+    return 0;
+}