Apdb

Red-black-tree-based data storage (for small program / light application / node / browser ), efficient and lightweight, support for persistence and temporary storage!

Usage

Install

npm i apdb --save

1. Import

1. for nodejs

   import apdb from 'apdb/node';
   

2. for wechat mini app

   import apdb from 'apdb/wechat';
   

3. for web browser

   import apdb from 'apdb/web';
   

2. Initial

const apdb = new apdb( params );

params [object]

key	desc	default
table	[string] storage table name	'default'

3. Insert

const result = await apdb.insert( params );

result [boolean]

if insert successful, result is true

params [object]

key	desc	default
key	[string] primary key	Date.now() + Math.random()
value	[object] value	null
update	[boolean] update current tree to storage, improve multi-line insert performance	true

demo

await apdb.insert({
  key: 'apdb key', 
  value: {
    name: 'apdb',
    author: 'echosoar'
  }
});

4. Select

const result = await apdb.select( params );

result [object]

key	desc
total	[number] Total number of data
result	[array] all lines satisfying conditions
result[n].key	primary key
result[n].value	value

params [object]

key	desc	default
table	[string] storage table name	'default'
key	[array string] which fields are returned	[]: return all fields
where	[object] conditions for select, key value pair; use $key as key to select primary key	null
order	[object] depend on certain columns for sorting, the value can be desc or asc	null
limit	[object]	null
limit.start	[number] limit which line to start returning	0
limit.size	[number] limit number of returns	null : return all lines

demo

const list = await apdb.select({
  where: {
    $key: /8/
  },
  order: {
    num: 'desc'
  },
  limit: {
    size: 5
  }
});

5. Update

const result = await apdb.update( params );

result [number]

result is the amount of updated lines

params [object]

key	desc	default
table	[string] storage table name	'default'
where	[object] conditions for update, key value pair; use $key as key to select primary key	null
value	[object] new value	{}
newValue	[boolean] if ture, the original value columns will be discarded	false

demo

const updateCount = await apdb.update({
    where: {
      num: 302910
    },
    value: { 
      up: 'test new value'
    },
});
  

6. Delete

const result = await apdb.delete( params );

result [number]

result is the amount of deleted lines

params [object]

key	desc	default
table	[string] storage table name	'default'
where	[object] conditions for delete, key value pair; use $key as key to select primary key	null

demo

const deleteCount = await apdb.delete({
    where: {
      num: 302909
    }
});

Performance

Node environment

type	amount(lines)	operate	time usage(ms)	space usage(MB)
json	1,000,000	init	2000	-
json	1,000,000	insert	14451	130.8
msgpack	1,000,000	init	7281	-
msgpack	1,000,000	insert	16288	100.7
- all	1,000,000	order desc	1729
- all	1,000,000	order asc	1746
- all	1,000,000	select where normal	103
- all	1,000,000	select where regexp	7197

Each line format

{
  key: "1545802142928test13",
  value: {
    "num":302910,
    "key":"1545801896834test302910"
  }
}