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install

npm i data-fs -S

exemples

const {DataFs} = require("data-fs")
var file = new DataFs("database.db")
file.insert(1,"hello world")
file.insert(2,"hello world!!!")
file.loop(function(record ,id){
     console.log(record,id)
})

// console.log 
// {id=1,value:"hello world"}
// {id=1,value:"hello world!!!"}

1. initiate DataFs class

   • const {DataFs} = require("./index")
   • var file = new DataFs(filepath)

2. insert

   • file.insert(id,value)
     • id : a unique alphanumeric value
     • value : any type supported by Serialization API string ,number ,json object ,map ,set

3. delete

   • delete(id)

4. update

   • update(id,value)

5. get size

   • getLength() //return the count of records

6. get record

   • getRecord(id) //return the registered value

7. loop through records

   • loop(callback,options)

     • callback : function receive the current record
     • options : json object to set the start and end point for the loop
       • from : start position
       • to : end position [ a negative number can be user to count from last element example -1 = to last item -2 = last item -1 ]

     example:

      file.loop(function(record,id){
        console.log(record,id)
      },{from:2,to:10})
     

8. find record

   • find(callback)

     • callback a function accept the current record and work like an array filter . the function return every record match the condition

        var results = file.find(function(record){
          return record== "hello world"
        })
        // return an array
        // results equal to ['hello world']
       

9. dataMap

• dataMap()

a function return an array represent the real state of records ,this function can be used for graphic representation

10. fragIndex

• fragIndex()

this function return the fragmentation index of the file this function maybe used for maintenance and to decide when defragmentation must be executed

11. defrag

• defrag()

this function is used to defragment the file

12. onError

• onError(callback)

   file.onError(function(error){
     console.log(error)
   })