added db and list of servers

dbMgr.js

@@ -0,0 +1,81 @@
+import sqlite3 from 'sqlite3'
+import { open } from 'sqlite'
+
+let db = null
+let error = null
+
+const dbInit = open({
+  filename: './sqlite.db',
+  driver: sqlite3.Database
+})
+  .then((database) => {
+    db = database
+    console.log('Connected to the database.')
+  })
+  .catch((err) => {
+    console.error('Error opening database: ' + err.message)
+    error = err
+    console.log(err)
+  })
+
+const getDb = async () => {
+  await dbInit
+  if (!db) throw new Error('Database not initialized.')
+  return db
+}
+
+const getServers = async (db) => {
+  return await db.all('SELECT * FROM servers')
+}
+
+const getServerByCol = async (db, col, val) => {
+  const data = await db.all('SELECT * FROM servers WHERE ? = ?', [col, val])
+  if(!data[0]) throw 'NOTFOUND'
+  return data[0]
+}
+
+export { getDb, getServers, getServerByCol }
+
+// const getProducts = async () => {
+//   const db = await getDb()
+//   return await db.all('SELECT * FROM Product')
+// }
+
+// const getProductById = async (id) => {
+//   const db = await getDb()
+//   const data = await db.all('SELECT * FROM Product WHERE id = ?', [id])
+//   if (!data[0]) throw 'NOTFOUND'
+//   return data[0]
+// }
+
+// const updateProduct = async (
+//   id,
+//   code,
+//   price,
+//   name
+// ) => {
+//   const db = await getDb()
+//   await db.run('UPDATE Product SET code = ?, price = ?, name = ? WHERE id = ?', [
+//     code,
+//     price,
+//     name,
+//     id
+//   ])
+// }
+
+// const addProduct = async (code, price, name) => {
+//   const db = await getDb()
+//   await db.run('INSERT INTO Product (code, price, name) VALUES (?, ?, ?)', [code, price, name])
+// }
+
+// const removeProduct = async (id) => {
+//   const db = await getDb()
+//   await db.run('DELETE FROM Product WHERE id = ?', [id])
+// }
+
+// const getProductByCode = async (code) => {
+//   const db = await getDb()
+//   const data = await db.all('SELECT * FROM Product WHERE code = ?', [code])
+//   if (!data[0]) throw 'NO_DATA'
+//   return data[0]
+// }