SQLite と Electron を使用して Go でデスクトップ アプリケーションを構築するためのベスト プラクティス

// main.go
package main

import (
    "database/sql"
    "fmt"
    _ "github.com/mattn/go-sqlite3"
)

func main() {
    db, err := sql.Open("sqlite3", "./example.db")
    if err != nil {
        panic(err)
    }
    defer db.Close()

    // Create table
    _, err = db.Exec("CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, age INT)")
    if err != nil {
        panic(err)
    }

    // Insert data
    stmt, err := db.Prepare("INSERT INTO users(name, age) values(?, ?)")
    if err != nil {
        panic(err)
    }
    defer stmt.Close()

    _, err = stmt.Exec("Alice", "25")
    if err != nil {
        panic(err)
    }

    // Query data
    rows, err := db.Query("SELECT * FROM users")
    if err != nil {
        panic(err)
    }
    defer rows.Close()

    var id int
    var name string
    var age int
    for rows.Next() {
        err = rows.Scan(&id, &name, &age)
        if err != nil {
            panic(err)
        }
        fmt.Printf("id=%d, name=%s, age=%d", id, name, age)
    }

    // Update data
    stmt, err = db.Prepare("UPDATE users SET age=? WHERE name=?")
    if err != nil {
        panic(err)
    }
    defer stmt.Close()

    _, err = stmt.Exec("30", "Alice")
    if err != nil {
        panic(err)
    }

    // Delete data
    stmt, err = db.Prepare("DELETE FROM users WHERE name=?")
    if err != nil {
        panic(err)
    }
    defer stmt.Close()

    _, err = stmt.Exec("Alice")
    if err != nil {
        panic(err)
    }
}

// main.js
const { app, BrowserWindow } = require('electron');
const path = require('path');
const { Database } = require('better-sqlite3');

function createWindow () {
  const win = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      preload: path.join(__dirname, 'preload.js')
    }
  })

  win.loadFile('index.html')
}

app.whenReady().then(() => {
  const db = new Database('./example.db');

  // Create table
  db.exec(`
    CREATE TABLE IF NOT EXISTS users (
        id INTEGER PRIMARY KEY AUTOINCREMENT,
        name TEXT,
        age INT
    )
  `);

  // Insert data
  const stmt = db.prepare('INSERT INTO users(name, age) VALUES(?, ?)');
  stmt.run('Alice', 25);

  // Query data
  const rows = db.prepare('SELECT * FROM users').all();
  rows.forEach((row) => {
      console.log(`id=${row.id}, name=${row.name}, age=${row.age}`);
  });

  // Update data
  const updateStmt = db.prepare('UPDATE users SET age=? WHERE name=?');
  updateStmt.run(30, 'Alice');

  // Delete data
  const deleteStmt = db.prepare('DELETE FROM users WHERE name=?');
  deleteStmt.run('Alice');

  createWindow();
})

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', () => {
  if (BrowserWindow.getAllWindows().length === 0) {
    createWindow()
  }
})