How to insert image in sqlite?

Hi this is not a new question but I still have no full solution for this. I am developing a cross platform application using cordova. I need to insert image inside sqlite. I am getting lots of code for android but I find it difficult to do with javascript. I am getting err.code:5 when I run the following code in my iPhone.

document.addEventListener("deviceready", onDeviceReady, false);
var img;
 var currentRow;
       var b = new Blob();
function previewFile() {
 // var preview = document.querySelector('img');
  var file    = document.querySelector('input[type=file]').files[0];
  var reader  = new FileReader();
 // var package_name = document.getElementById("pr").value;

  reader.onloadend = function () {
  // img = reader.result;
    if(file.type.match('image.*'))
    {
    img = reader.result;
   // ref.push({"image":image,"service":arr,"package_name":package_name});
}
else
{
  alert("select an image file");
}
  }

  if (file) {
    reader.readAsDataURL(file);
  } else {
    preview.src = "";
  }
   var image1 = encodeURI(img);
   // var b = new Blob();
    b = image1;

    console.log(b);
    console.log(image1);
    //document.write('<img src="'+image+'"/>');
}
function onDeviceReady() {
            var db = window.sqlitePlugin.openDatabase({name:"sqlite"});
            db.transaction(populateDB, errorCB, successCB);
        }
 function populateDB(tx) {
            tx.executeSql('CREATE TABLE IF NOT EXISTS DEMO (id INTEGER PRIMARY KEY AUTOINCREMENT, name,number,image BLOB)');
        }
         function insertDB(tx) {
            tx.executeSql('INSERT INTO DEMO (name,number,image) VALUES ("' +document.getElementById("txtName").value
                    +'","'+document.getElementById("txtNumber").value+'","' +b+ '")');

        }
        function goInsert() {
            var db = window.sqlitePlugin.openDatabase({name:"sqlite"});
            db.transaction(insertDB, errorCB, successCB);
        }

My html code:

<input type="file" onchange="previewFile()">    
       <button onclick="goInsert()">Insert</button>

How to do this. Can someone help me? Thanks in advance...