nv-id-info-local-db

• for small scale data (count < 1024 X 1024) local-storage

install

• npm install nv-id-info-local-db

usage

  const x   = require("nv-id-info-local-db");

example

		var db = x.creat_db("./TEST",1024,64);
		/*
		> db
		DB {
		  meta: {
			real_cnt: 1025,
			max_cnt: 1024,
			each_group_cnt: 64,
			groups: [
			  [Array], [Array], [Array],
			  [Array], [Array], [Array],
			  [Array], [Array], [Array],
			  [Array], [Array], [Array],
			  [Array], [Array], [Array],
			  [Array]
			]
		  },
		  pathd: {
			workdir: '/home/cu-lib/nv-id-info-local-db/TEST',
			meta: '/home/cu-lib/nv-id-info-local-db/TEST/___meta___.json',
			zero: '/home/cu-lib/nv-id-info-local-db/TEST/0.v8ser',
			groups: [
			  '/home/cu-lib/nv-id-info-local-db/TEST/g0',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g1',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g2',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g3',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g4',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g5',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g6',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g7',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g8',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g9',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g10',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g11',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g12',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g13',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g14',
			  '/home/cu-lib/nv-id-info-local-db/TEST/g15'
			]
		  },
		  memd: {
			'0': {},
			'1': {},
			'2': {},
			'3': {},
			'4': {},
			'5': {},
			'6': {},
			'7': {},
			'8': {},
			'9': {},
			'10': {},
			'11': {},
			'12': {},
			'13': {},
			'14': {},
			'15': {},
			___zero___: { id: 0, f64passwd: 0, data: null }
		  },
		  cursor: 1,
		  flags: [
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
			0, 0, 0, 0,
			... 925 more items
		  ]
		}
		*/


		var [id,hint] = db.inst_one(new Set([11,22,"sss"]))

		/*
		> id
		1
		> hint
		1713774482623.2795
		> 
		*/

		> db.get_one(id,hint)
		{
		  id: 1,
		  f64passwd: 1713774781353.7732,
		  data: Set(3) { 11, 22, 'sss' }
		}

		> db.updt_one(id,hint,new Error("err-as-data"))
		true
		> db.get_one(id,hint)
		{
		  id: 1,
		  f64passwd: 1713774781353.7732,
		  data: Error: err-as-data
			  at REPL35:1:21
			  at Script.runInThisContext (node:vm:122:12)
			  at REPLServer.defaultEval (node:repl:570:29)
			  at bound (node:domain:433:15)
			  at REPLServer.runBound [as eval] (node:domain:444:12)
			  at REPLServer.onLine (node:repl:900:10)
			  at REPLServer.emit (node:events:523:35)
			  at REPLServer.emit (node:domain:489:12)
			  at [_onLine] [as _onLine] (node:internal/readline/interface:415:12)
			  at [_line] [as _line] (node:internal/readline/interface:886:18)
		}
		> 
		db.dele_one(id,hint)
		> db.has(id,hint)
		false
		> 


		var [id,hint] = db.inst_one(new Set([11,22,"sss"]))
		var [id,hint] = db.inst_one(new Map())
		var [id,hint] = db.inst_one(new Uint8Array(8))
		var [id,hint] = db.inst_one("qqq")


		> db.slct((id,hint,data)=>typeof(data)=="string")
		[ { id: 4, f64passwd: 1713777224232.4827, data: 'qqq' } ]

METHODS

	db._save                 db.aloc                  db.constructor           db.dele_one              db.get_one               db.gid                   db.gpath                 db.has
	db.has_f64passwd         db.has_id                db.inst_one              db.slct                  db.updt_one              db.zero_

	db.cursor                db.flags                 db.memd                  db.meta                  db.pathd

APIS

•        creat\_db(workdir, max\_count=1024768, chunk\_count=1024)    chunk\_count means how many data saved in one file

LICENSE

• ISC