neo4j的examples之EmbeddedNeo4jWithCustomLogging.java

neo4j的examples之EmbeddedNeo4jWithCustomLogging.java

源码：

/* * Licensed to Neo Technology under one or more contributor * license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright * ownership. Neo Technology licenses this file to you under * the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */
package org.neo4j.examples;

import java.io.File;
import java.io.IOException;

import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.io.fs.FileUtils;
import org.neo4j.logging.NullLog;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;

public class EmbeddedNeo4jWithCustomLogging {
    private static final String DB_PATH = "target/neo4j-store";
    private static GraphDatabaseService graphDb;

    private static class MyCustomLogProvider implements LogProvider {
        public MyCustomLogProvider( Object output )
        {
        }

        @Override
        public Log getLog( Class loggingClass )
        {
            return NullLog.getInstance();
        }

        @Override
        public Log getLog( String context )
        {
            return NullLog.getInstance();
        }
    }

    public static void main( final String[] args ) throws IOException
    {
        FileUtils.deleteRecursively( new File( DB_PATH ) );

        Object output = new Object();

        // START SNIPPET: startDbWithLogProvider
        LogProvider logProvider = new MyCustomLogProvider( output );
        graphDb = new GraphDatabaseFactory().setUserLogProvider( logProvider ).newEmbeddedDatabase( DB_PATH );
        // END SNIPPET: startDbWithLogProvider

        shutdown();
    }

    private static void shutdown()
    {
        graphDb.shutdown();
    }
}

运行结果：
空

修改：

/* * Licensed to Neo Technology under one or more contributor * license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright * ownership. Neo Technology licenses this file to you under * the Apache License, Version 2.0 (the "License"); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */

//
package n1;
/** * @author xubo601450868 * 不删除，读取http://blog.csdn.net/xubo245/article/details/50033549创建的信息 * 查询所有节点和所有relationship * * */
import java.io.File;
import java.io.IOException;

import org.neo4j.cypher.ExecutionEngine;
import org.neo4j.cypher.ExecutionResult;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.io.fs.FileUtils;
import org.neo4j.logging.NullLog;
import org.neo4j.logging.Log;
import org.neo4j.logging.LogProvider;

public class EmbeddedNeo4jWithCustomLogging {
    private static final String DB_PATH = "target/neo4j-hello-db";
    private static GraphDatabaseService graphDb;

    private static class MyCustomLogProvider implements LogProvider {
        public MyCustomLogProvider( Object output )
        {
        }

        @Override
        public Log getLog( Class loggingClass )
        {
            return NullLog.getInstance();
        }

        @Override
        public Log getLog( String context )
        {
            return NullLog.getInstance();
        }
    }

    public static void main( final String[] args ) throws IOException
    {
        //FileUtils.deleteRecursively( new File( DB_PATH ) );

        Object output = new Object();

        // START SNIPPET: startDbWithLogProvider
        LogProvider logProvider = new MyCustomLogProvider( output );
        graphDb = new GraphDatabaseFactory().setUserLogProvider( logProvider ).newEmbeddedDatabase( DB_PATH );
        // END SNIPPET: startDbWithLogProvider
        System.out.println("hello neo4j log");
        //Node firstNode;
        //firstNode = graphDb.createNode();
        //firstNode.setProperty( "message", "Hello,scala " );

        ExecutionEngine engine =new ExecutionEngine(graphDb,  logProvider);
         ExecutionResult result = engine.execute("start n=node(*) return n;");  
          System.out.println(result.dumpToString());  

          ExecutionResult result2 = engine.execute("start n=node(*) match (n)-[r]->() return r;");  
          System.out.println(result2.dumpToString());  
        shutdown();
    }

    private static void shutdown()
    {
        graphDb.shutdown();
    }
}

结果：

hello neo4j log
+--------------------------------------+
| n |
+--------------------------------------+
| Node[0]{message:"Hello,scala "} |
| Node[1]{message:"hello World!"} |
| Node[2]{message:"hello World!1"} |
| Node[3]{message:"hello World!2"} |
| Node[4]{message:"hello World!3"} |
| Node[5]{message:"hello World!4"} |
| Node[6]{message:"hello World!5"} |
| Node[7]{message:"hello World!6"} |
| Node[8]{message:"hello World!7"} |
| Node[9]{message:"hello World!8"} |
| Node[10]{message:"hello World!9"} |
| Node[11]{message:"hello World!10"} |
| Node[12]{message:"hello World!11"} |
| Node[13]{message:"hello World!12"} |
| Node[14]{message:"hello World!13"} |
| Node[15]{message:"hello World!14"} |
| Node[16]{message:"hello World!15"} |
| Node[17]{message:"hello World!16"} |
| Node[18]{message:"hello World!17"} |
| Node[19]{message:"hello World!18"} |
| Node[20]{message:"hello World!19"} |
| Node[21]{message:"hello World!20"} |
| Node[22]{message:"hello World!21"} |
| Node[23]{message:"hello World!22"} |
| Node[24]{message:"hello World!23"} |
| Node[25]{message:"hello World!24"} |
| Node[26]{message:"hello World!25"} |
| Node[27]{message:"hello World!26"} |
| Node[28]{message:"hello World!27"} |
| Node[29]{message:"hello World!28"} |
| Node[30]{message:"hello World!29"} |
| Node[31]{message:"hello World!30"} |
| Node[32]{message:"hello World!31"} |
| Node[33]{message:"hello World!32"} |
| Node[34]{message:"hello World!33"} |
| Node[35]{message:"hello World!34"} |
| Node[36]{message:"hello World!35"} |
| Node[37]{message:"hello World!36"} |
| Node[38]{message:"hello World!37"} |
| Node[39]{message:"hello World!38"} |
| Node[40]{message:"hello World!39"} |
| Node[41]{message:"hello World!40"} |
| Node[42]{message:"hello World!41"} |
| Node[43]{message:"hello World!42"} |
| Node[44]{message:"hello World!43"} |
| Node[45]{message:"hello World!44"} |
| Node[46]{message:"hello World!45"} |
| Node[47]{message:"hello World!46"} |
| Node[48]{message:"hello World!47"} |
| Node[49]{message:"hello World!48"} |
| Node[50]{message:"hello World!49"} |
| Node[51]{message:"hello World!50"} |
| Node[52]{message:"hello World!51"} |
| Node[53]{message:"hello World!52"} |
| Node[54]{message:"hello World!53"} |
| Node[55]{message:"hello World!54"} |
| Node[56]{message:"hello World!55"} |
| Node[57]{message:"hello World!56"} |
| Node[58]{message:"hello World!57"} |
| Node[59]{message:"hello World!58"} |
| Node[60]{message:"hello World!59"} |
| Node[61]{message:"hello World!60"} |
| Node[62]{message:"hello World!61"} |
| Node[63]{message:"hello World!62"} |
| Node[64]{message:"hello World!63"} |
| Node[65]{message:"hello World!64"} |
| Node[66]{message:"hello World!65"} |
| Node[67]{message:"hello World!66"} |
| Node[68]{message:"hello World!67"} |
| Node[69]{message:"hello World!68"} |
| Node[70]{message:"hello World!69"} |
| Node[71]{message:"hello World!70"} |
| Node[72]{message:"hello World!71"} |
| Node[73]{message:"hello World!72"} |
| Node[74]{message:"hello World!73"} |
| Node[75]{message:"hello World!74"} |
| Node[76]{message:"hello World!75"} |
| Node[77]{message:"hello World!76"} |
| Node[78]{message:"hello World!77"} |
| Node[79]{message:"hello World!78"} |
| Node[80]{message:"hello World!79"} |
| Node[81]{message:"hello World!80"} |
| Node[82]{message:"hello World!81"} |
| Node[83]{message:"hello World!82"} |
| Node[84]{message:"hello World!83"} |
| Node[85]{message:"hello World!84"} |
| Node[86]{message:"hello World!85"} |
| Node[87]{message:"hello World!86"} |
| Node[88]{message:"hello World!87"} |
| Node[89]{message:"hello World!88"} |
| Node[90]{message:"hello World!89"} |
| Node[91]{message:"hello World!90"} |
| Node[92]{message:"hello World!91"} |
| Node[93]{message:"hello World!92"} |
| Node[94]{message:"hello World!93"} |
| Node[95]{message:"hello World!94"} |
| Node[96]{message:"hello World!95"} |
| Node[97]{message:"hello World!96"} |
| Node[98]{message:"hello World!97"} |
| Node[99]{message:"hello World!98"} |
| Node[100]{message:"hello World!99"} |
| Node[101]{message:"hello World!100"} |
+--------------------------------------+
102 rows

+-----------------------------------+
| r |
+-----------------------------------+
| :KNOWS[0]{message:"brave Neo4j "} |
+-----------------------------------+
1 row