Dump

[TanmoySG]

Put everything here, that wont go in

• Packages I can Use #1
• Guides to Refer #2
• Ideas I have #3

[TanmoySG]

package main

import (
  "encoding/json"
  "fmt"
  "io/ioutil"
  "os"
  "path/filepath"
)

type Document struct {
  // The fields and values of the document
  Fields map[string]interface{}
}

func (d *Document) Save() error {
  // Convert the document to JSON
  jsonBytes, err := json.Marshal(d.Fields)
  if err != nil {
    return err
  }

  // Save the JSON to a file
  err = ioutil.WriteFile(d.Fields["id"].(string)+".json", jsonBytes, 0644)
  if err != nil {
    return err
  }

  return nil
}

func (d *Document) Load(id string) error {
  // Read the JSON file
  jsonBytes, err := ioutil.ReadFile(id + ".json")
  if err != nil {
    return err
  }

  // Unmarshal the JSON into the document
  err = json.Unmarshal(jsonBytes, &d.Fields)
  if err != nil {
    return err
  }

  return nil
}

func (d *Document) Delete() error {
  // Delete the JSON file
  err := os.Remove(d.Fields["id"].(string) + ".json")
  if err != nil {
    return err
  }

  return nil
}

func main() {
  // Create a new document
  doc := Document{
    Fields: map[string]interface{}{
      "id":   "1",
      "name": "John Doe",
      "age":  30,
    },
  }

  // Save the document
  err := doc.Save()
  if err != nil {
    panic(err)
  }

  // Load the document
  err = doc.Load("1")
  if err != nil {
    panic(err)
  }

  // Print the fields of the document
  fmt.Println(doc.Fields)

  // Delete the document
  err = doc.Delete()
  if err != nil {
    panic(err)
  }

  // Check if the document still exists
  _, err = os.Stat(filepath.Join("1.json"))
  if os.IsNotExist(err) {
    fmt.Println("Document has been deleted")
  }
}

From ChatGPT

This program defines a Document struct that represents a document in the database. The struct has methods to save, load, and delete documents from the database. The database itself is simply a collection of JSON files, one for each document, stored in the local file system.

Please note that this is a very simple example and does not include all of the features and functionality of a full-fledged DBMS. It is intended only as a demonstration of how to create a document-oriented DBMS using Go

[TanmoySG]

package main

import (
"fmt"
"github.com/google/btree"
)

type Item struct {
Key string
Value string
}

// Implement the btree.Item interface for our Item type
func (i Item) Less(than btree.Item) bool {
return i.Key < than.(Item).Key
}

func main() {
tree := btree.New(3) // Create a new B-tree with a degree of 3

// Insert some items into the tree
tree.ReplaceOrInsert(Item{"apple", "red"})
tree.ReplaceOrInsert(Item{"banana", "yellow"})
tree.ReplaceOrInsert(Item{"cherry", "red"})

// Look up an item by its key
item := tree.Get(Item{"banana", ""})
fmt.Println(item.(Item).Value) // Output: "yellow"

// Iterate over all items in the tree
tree.Ascend(func(i btree.Item) bool {
	item := i.(Item)
	fmt.Println(item.Key, item.Value)
	return true
})

}