Install neo4j from here
Add the neo4j jar file neo4j-desktop-2.1.6 to the project from the folder Program Files (x86)\Neo4j Community\bin
Sample code
package blog.neo4j;
import java.io.File;
import java.util.Iterator;
import java.util.concurrent.TimeUnit;
import org.neo4j.cypher.javacompat.ExecutionEngine;
import org.neo4j.cypher.javacompat.ExecutionResult;
import org.neo4j.graphdb.DynamicLabel;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.helpers.collection.IteratorUtil;
import org.neo4j.graphdb.schema.IndexDefinition;
import org.neo4j.graphdb.schema.Schema;
/**
*
* @author sony
*/
public class EmbeddedNeo4j {
private static final String DB_PATH = "target/neo4j-hello-db";
// START SNIPPET: vars
GraphDatabaseService graphDb;
// END SNIPPET: vars
// START SNIPPET: createReltype
private static enum RelTypes implements RelationshipType
{
FOLLOWEDBY,
FOLLOWEROF,
TWEETED,
TWEETED_BY
}
// END SNIPPET: createReltype
private static enum LabelTypes implements Label
{
USER,
TWEET
}
void deletePreviousDatabase()
{
deleteFileOrDirectory( new File( DB_PATH ) );
}
void startDb()
{
graphDb = new GraphDatabaseFactory().newEmbeddedDatabase( DB_PATH );
registerShutdownHook( graphDb );
}
void createIndex()
{
IndexDefinition indexDefinition,indexDefinition1;
try ( Transaction tx = graphDb.beginTx() )
{
Schema schema = graphDb.schema();
indexDefinition = schema.indexFor( DynamicLabel.label( "USER" ) )
.on( "userid" )
.create();
indexDefinition1 = schema.indexFor( DynamicLabel.label( "TWEET" ) )
.on( "tweetid" )
.create();
tx.success();
}
try ( Transaction tx = graphDb.beginTx() )
{
Schema schema = graphDb.schema();
schema.awaitIndexOnline( indexDefinition1, 10, TimeUnit.SECONDS );
}
}
void create_nodes_relationships()
{
try ( Transaction tx = graphDb.beginTx() )
{
//Create nodes
Node user1=graphDb.createNode(LabelTypes.USER);
user1.setProperty("Userid", 1);
user1.setProperty("Name","Siva");
Node user2=graphDb.createNode(LabelTypes.USER);
user2.setProperty("Userid", 2);
user2.setProperty("Name", "Kumar");
Node user3=graphDb.createNode(LabelTypes.USER);
user3.setProperty("Userid", 3);
user3.setProperty("Name", "Priya");
Node tweet1=graphDb.createNode(LabelTypes.TWEET);
tweet1.setProperty("Tweetid", 1);
tweet1.setProperty("Text","Hello");
Node tweet2=graphDb.createNode(LabelTypes.TWEET);
tweet2.setProperty("Tweetid", 2);
tweet2.setProperty("Text", "Hai");
Node tweet3=graphDb.createNode(LabelTypes.TWEET);
tweet3.setProperty("Tweetid", 3);
tweet3.setProperty("Text", "Our lives are not our own. From womb to tomb, we are bound to others. Past and present. And by each crime and every kindness, we birth our future.");
System.out.println("Nodes created");
user1.createRelationshipTo(user2, RelTypes.FOLLOWEDBY);
user1.createRelationshipTo(user2, RelTypes.FOLLOWEROF);
user1.createRelationshipTo(user3, RelTypes.FOLLOWEDBY);
user1.createRelationshipTo(user3, RelTypes.FOLLOWEROF);
user2.createRelationshipTo(user1, RelTypes.FOLLOWEDBY);
user2.createRelationshipTo(user1, RelTypes.FOLLOWEROF);
user2.createRelationshipTo(user3, RelTypes.FOLLOWEDBY);
user2.createRelationshipTo(user3, RelTypes.FOLLOWEROF);
user3.createRelationshipTo(user2, RelTypes.FOLLOWEDBY);
user3.createRelationshipTo(user2, RelTypes.FOLLOWEROF);
user3.createRelationshipTo(user1, RelTypes.FOLLOWEDBY);
user3.createRelationshipTo(user1, RelTypes.FOLLOWEROF);
System.out.println("relationship created");
//select nodes using index
for(int i=1;i<=3;i++)
{
Node user,tweet;
ResourceIterator nodelist1 = graphDb.findNodesByLabelAndProperty( DynamicLabel.label( "USER" ), "Userid", i).iterator();
ResourceIterator nodelist2 = graphDb.findNodesByLabelAndProperty( DynamicLabel.label( "TWEET" ), "Tweetid", i).iterator();
user=nodelist1.next();
tweet=nodelist2.next();
user.createRelationshipTo(tweet, RelTypes.TWEETED);
tweet.createRelationshipTo(user, RelTypes.TWEETED_BY);
}
tx.success();
}
try ( Transaction tx = graphDb.beginTx() )
{
ExecutionEngine engine = new ExecutionEngine(graphDb);
for(int i=1;i<=3;i++)
{
ExecutionResult result=engine.execute( "match (n {Userid: '"+i+"'}) return n" );
Iterator n_column = result.columnAs( "n" );
for ( Node node : IteratorUtil.asIterable( n_column ) )
{
node.setProperty("type", "user");
}
}
for(int i=1;i<=3;i++)
{
ExecutionResult result=engine.execute( "match (n {Tweetid: '"+i+"'}) return n" );
Iterator n_column = result.columnAs( "n" );
for ( Node node : IteratorUtil.asIterable( n_column ) )
{
node.setProperty("type", "tweet");
}
}
tx.success();
}
}
void removeData()
{
try ( Transaction tx = graphDb.beginTx() )
{
for(int i=1;i<=3;i++)
{
Node user,tweet;
ResourceIterator nodelist1 = graphDb.findNodesByLabelAndProperty( DynamicLabel.label( "USER" ), "Userid", i).iterator();
ResourceIterator nodelist2 = graphDb.findNodesByLabelAndProperty( DynamicLabel.label( "TWEET" ), "Tweetid", i).iterator();
user=nodelist1.next();
tweet=nodelist2.next();
user.delete();
tweet.delete();
}
tx.success();
}
}
void shutDown()
{
System.out.println();
System.out.println( "Shutting down database ..." );
// START SNIPPET: shutdownServer
graphDb.shutdown();
// END SNIPPET: shutdownServer
}
// START SNIPPET: shutdownHook
private static void registerShutdownHook( final GraphDatabaseService graphDb )
{
// Registers a shutdown hook for the Neo4j instance so that it
// shuts down nicely when the VM exits (even if you "Ctrl-C" the
// running application).
Runtime.getRuntime().addShutdownHook( new Thread()
{
@Override
public void run()
{
graphDb.shutdown();
}
} );
}
// END SNIPPET: shutdownHook
private static void deleteFileOrDirectory( File file )
{
if ( file.exists() )
{
if ( file.isDirectory() )
{
for ( File child : file.listFiles() )
{
deleteFileOrDirectory( child );
}
}
file.delete();
}
}
private String[] parseDataRow (String row,int len)
{
String properties[] = new String[len];
row = row.substring(1, row.length()-1);
//System.out.println(row);
for(int i=0;i
{
//System.out.println(i);
if(row.charAt(0)=='u')
{
if(i!=len-1)
{
boolean flag=false;
if(flag=(row.charAt(2)==','))
{
row = "u"+row.charAt(1)+row.substring(3);
}
properties[i]=row.substring(2, row.indexOf(row.charAt(1)+","));
if(flag)
{
properties[i] = ","+properties[i];
}
//System.out.println(properties[i]);
row=row.substring(row.indexOf(row.charAt(1)+",")+3);
//System.out.println(row);
}
else
{
properties[i]=row.substring(2,row.length()-1);
//System.out.println(properties[i]);
}
}
else
{
if(i!=len-1)
{
properties[i]=row.substring(0, row.indexOf(","));
//System.out.println(properties[i]);
row=row.substring(row.indexOf(",")+2);
//System.out.println(row);
}
else
{
properties[i]=row;
//System.out.println(properties[i]);
}
}
}
return properties;
}
}
Net-beans project implementing the source code can be found here
The output of the project will be created in folder blog neo4j\target\neo4j-hello-db
the data base can be viewed in neo4j browser
sample output
