title: Add a new record to an existing records contained excel file in excel js( already the excel contains some value now trying to insert a new record )
body: <p>1 -I want to add a new record inside the excel which is already contains some value 
  2 - Is there any way to use excel as the database for our project</p>
  
  <p>so that client can use the excel effieciently</p>
  
  <p>//script file.js</p>
  
  <pre><code>          var  Excel = require('exceljs');
            var workbook = new Excel.Workbook();
  
          //calling 2 function (writeFile() and writeFile1() )
            writeFile();
            writeFile1();
           // this function should add/ create the record in excel file  
            function writeFile(){
  
                      var worksheet = workbook.addWorksheet('sheet1');
                       worksheet.columns =[
                       {header:"Id",key:"id",width:10},
                       {header:'Type',key:'type',width:15},
                       {header:'Assigned Engineer',key:'eng',width:25},
                       {header:'Due Date',key:'ddate',width:18},
                       {header:'Client Name',key:'cname',width:20},
                       {header:'person Name',key:'pname',width:20},
                       {header:'enquiry type',key:'etype',width:18},
                       {header:'acknowledge',key:'ack',width:20}
                        ]
  
  
  
      Worksheet.addRow({id:16,type:"Trading1221",eng:"Dhanasekar122",ddate:new 
          Date(),cname:"Ford22",pname:"sekar22",etype:"pipeling2",ack:"Y2"})
      worksheet.addRow({id:71,type:"Trading3221",eng:"Dhanasekar322",ddate:new 
      Date(),cname:"Ford32",pname:"sekar32",etype:"pipeling3",ack:"Y3"})
  
      workbook.xlsx.writeFile('file2.xlsx').then(function(){
  
       })
          }
  
        //similary this below function should also add the record inside the  
         // excel
       function writeFile1(){
        var worksheet = workbook.addWorksheet('sheet1');
                       worksheet.columns =[
                       {header:"Id",key:"id",width:10},
                       {header:'Type',key:'type',width:15},
                       {header:'Assigned Engineer',key:'eng',width:25},
                       {header:'Due Date',key:'ddate',width:18},
                       {header:'Client Name',key:'cname',width:20},
                       {header:'person Name',key:'pname',width:20},
                       {header:'enquiry type',key:'etype',width:18},
                       {header:'acknowledge',key:'ack',width:20}
                        ]
  
    Worksheet.addRow({id:11,type:"Trading1221",eng:"Dhana11sekar122",ddate:new 
          Date(),cname:"Fo12",pname:"sekar122",etype:"pi1peling2",ack:"Y2"})
  
  
  
  worksheet.addRow({id:171,type:"Trading31221",eng:"Dhanasekar11322",ddate:new 
      Date(),cname:"For1d32",pname:"sek1ar32",etype:"pipelin1g3",ack:"Y13"})
  
      workbook.xlsx.writeFile('file2.xlsx').then(function(){
  
       })
        }
  </code></pre>
  
  <p>//         what happening is value is overwriting and the excel has the last 
           inserted value
           I had even tried in the second function of removing the columns but 
           still works the same and shows error on some time</p>