title: Use Neo4j Import Tool to add data to existing database
body: <p>I am using the Neo4j Import Tool to import large datasets to my existing graph. When importing .csv data to my graph i get</p>
  
  <pre><code>Directory '...' already contains a database.
  </code></pre>
  
  <p><a href="https://github.com/neo4j-examples/neo4j-movies-template/blob/master/README.md" rel="noreferrer">Github</a> suggests the following solution:</p>
  
  <pre><code>"If you see Input error: Directory 'neo4j-community-
  3.0.3/data/databases/graph.db' already contains a database, delete the 
  graph.db directory and try again."
  </code></pre>
  
  <p>So I have to delete my graph and a new one will be created. I tryed - it works.</p>
  
  <p>But how can I add Data to an existing database, so without deleting mine?</p>
  
  <p>Thanks!</p>