first commit

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

.idea/InvoDB.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module classpath="CMake" type="CPP_MODULE" version="4" />

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/InvoDB.iml" filepath="$PROJECT_DIR$/.idea/InvoDB.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

invodb/io/page_manager.cpp

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+//
+// Created by YuhangQ on 2021/9/24.
+//
+
+#include "page_manager.h"
+
+int PageManager::loadDatabase(const char *filename) {
+    stream.open(filename);
+
+    printf("%d", stream.is_open());
+
+    stream << "hello" << std::endl;
+    stream.flush();
+    return 0;
+}
+
+StoragePage& PageManager::getPage(const int &index) {
+    StoragePage page;
+    // 调整指针位置
+    stream.seekg((index - 1) << 2);
+    stream.read(page, 4096);
+    return page;
+}

invodb/io/page_manager.h

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+//
+// Created by YuhangQ on 2021/9/24.
+//
+
+#ifndef INVODB_PAGE_MANAGER_H
+#define INVODB_PAGE_MANAGER_H
+
+#include <iostream>
+#include <fstream>
+
+class StoragePage {
+public:
+    char& operator[] (int index) { return this->page[index]; }
+    operator const char *() { return this->page; }
+    operator char *() { return this->page; }
+    ~StoragePage() {
+        printf("我被回收了");
+    }
+private:
+    char page[4096];
+};
+
+class PageManager {
+public:
+    static PageManager& Instance() {
+        static PageManager instance;
+        return instance;
+    }
+    int loadDatabase(const char *filename);
+    StoragePage& getPage(const int &index);
+    void setPage(const int &index, const StoragePage &page);
+private:
+    std::fstream stream;
+
+    // 私有化实现单例
+    PageManager();
+    ~PageManager();
+    PageManager(const PageManager&);
+    PageManager& operator=(const PageManager&);
+};
+
+
+#endif //INVODB_PAGE_MANAGER_H

invodb/io/virtual_storage.cpp

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+//
+// Created by YuhangQ on 2021/9/30.
+//
+
+#include "virtual_storage.h"

invodb/io/virtual_storage.h

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+//
+// Created by YuhangQ on 2021/9/30.
+//
+
+#ifndef INVODB_VIRTUAL_STORAGE_H
+#define INVODB_VIRTUAL_STORAGE_H
+
+
+
+
+
+class VirtualStorage {
+public:
+
+private:
+
+};
+
+
+#endif //INVODB_VIRTUAL_STORAGE_H

invodb/main.cpp

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+//
+// Created by YuhangQ on 2021/9/24.
+//
+
+#include "main.h"
+
+
+int main() {
+    PageManager& manager = PageManager::Instance();
+    manager.loadDatabase("test.invodb");
+
+    manager.getPage(0);
+
+    return 0;
+}

invodb/main.h

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+//
+// Created by YuhangQ on 2021/9/24.
+//
+
+#ifndef INVODB_MAIN_H
+#define INVODB_MAIN_H
+
+#include <iostream>
+#include "io/page_manager.h"
+#include "io/virtual_storage.h"
+
+#endif //INVODB_MAIN_H