hey
i ma also trying to run this same cypher query with the same program. but m
getting "non-empty iterator" error everytime.i have also tried out
suggestions that u got..if possible provide me some othe rway to solve this
issue
package embeddedneo4j;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import org.neo4j.graphdb.Direction;
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.factory.GraphDatabaseFactory;
import org.neo4j.kernel.impl.util.FileUtils;
import org.neo4j.cypher.javacompat.ExecutionEngine;
import org.neo4j.cypher.javacompat.ExecutionResult;
import org.neo4j.helpers.collection.IteratorUtil;
public class EmbeddedNeo4j
{
private static final String DB_PATH = "target/neo4j-hello-db";
public String greeting;
// START SNIPPET: vars
GraphDatabaseService graphDb;
Node firstNode;
Node secondNode;
Relationship relationship;
// END SNIPPET: vars
// START SNIPPET: createReltype
private static enum RelTypes implements RelationshipType
{
KNOWS
}
// END SNIPPET: createReltype
public static void main( final String[] args )
{
EmbeddedNeo4j hello = new EmbeddedNeo4j();
hello.createDb();
hello.removeData();
hello.shutDown();
}
void createDb()
{
clearDb();
// START SNIPPET: startDb
graphDb = new GraphDatabaseFactory().newEmbeddedDatabase( DB_PATH );
registerShutdownHook( graphDb );
// END SNIPPET: startDb
// START SNIPPET: transaction
try ( Transaction tx = graphDb.beginTx() )
{
// Database operations go here
// END SNIPPET: transaction
// START SNIPPET: addData
firstNode = graphDb.createNode();
firstNode.setProperty( "message", "Hello, " );
secondNode = graphDb.createNode();
secondNode.setProperty( "message", "World!" );
relationship = firstNode.createRelationshipTo( secondNode,
RelTypes.KNOWS );
relationship.setProperty( "message", "brave Neo4j " );
// END SNIPPET: addData
// START SNIPPET: readData
System.out.print( "1:" + firstNode.getProperty( "message" ) );
System.out.print( "\n2:" + relationship.getProperty( "message"
) );
System.out.print( "\n3:" + secondNode.getProperty( "message" )
);
// END SNIPPET: readData
greeting = ( (String) firstNode.getProperty( "message" ) )
+ ( (String) relationship.getProperty( "message" ) )
+ ( (String) secondNode.getProperty( "message" ) );
// START SNIPPET: transaction
tx.success();
}
// END SNIPPET: transaction
//Query Execution
ExecutionEngine engine = new ExecutionEngine( graphDb );
// String query = "START n=node(*) WHERE n.message = 'World!' RETURN
n, n.message";
// ExecutionResult result = engine.execute( query);
ExecutionResult result;
// try ( Transaction ignored = graphDb.beginTx() ){
//result = engine.execute( "start n=node(*) where n.message =
'World!' return n, n.message" );
result = engine.execute( "start n=node(*) return n" );
System.out.print("\nResult is :" + result.toString());
// }
}
private void clearDb()
{
try
{
FileUtils.deleteRecursively( new File( DB_PATH ) );
}
catch ( IOException e )
{
throw new RuntimeException( e );
}
}
void removeData()
{
try ( Transaction tx = graphDb.beginTx() )
{
// START SNIPPET: removingData
// let's remove the data
firstNode.getSingleRelationship( RelTypes.KNOWS,
Direction.OUTGOING ).delete();
firstNode.delete();
secondNode.delete();
// END SNIPPET: removingData
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
}
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