系統環境：

Ubuntu 04.10 x64

一：安裝

下載最新版：neo4j-community-2.2.3-unix.tar.gz ?解壓?

cd?neo4j-community-2.2.3/bin

./neo4j start

啟動之后。默認的webport是：7474

三：JAVA操作neo4j

以下樣例演示了一個銀行層級關系的樣例

央行以下有四大行，四大行以下有各自的分行。各自的分行又有各自的支行

package com.lala.neo4j;import org.neo4j.graphdb.Label;public class BankLabel implements Label {private String name;public BankLabel(String name){this.name = name;}public String name() {return name;} }

package com.lala.neo4j;import org.neo4j.graphdb.RelationshipType;public class BankRelationshipType implements RelationshipType {private String ship;public BankRelationshipType(String ship){this.ship = ship;}public String name() {return ship;} }

package com.lala.neo4j;import org.neo4j.graphdb.GraphDatabaseService; import org.neo4j.graphdb.Node; import org.neo4j.graphdb.Transaction; import org.neo4j.graphdb.factory.GraphDatabaseFactory;public class Neo4j {/*** 標簽*/static BankLabel top = new BankLabel("總行");static BankLabel sdh = new BankLabel("四大銀行");static BankLabel fh = new BankLabel("分行");static BankLabel zh = new BankLabel("支行");/*** 關系*/static BankRelationshipType xj = new BankRelationshipType("XJ");static BankRelationshipType sj = new BankRelationshipType("SJ");/*** 初始化總行和分行的關系數據*/static void init1(GraphDatabaseService db)throws Exception{Node n1 = db.createNode(top);n1.setProperty("name", "央行");Node n2 = db.createNode(sdh);n2.setProperty("name", "農業銀行");Node n3 = db.createNode(sdh);n3.setProperty("name", "工商銀行");n1.createRelationshipTo(n2, sj);n2.createRelationshipTo(n1, xj);n1.createRelationshipTo(n3, sj);n3.createRelationshipTo(n1, xj);}/*** 初始化農業銀行分行數據*/static void init2(GraphDatabaseService db)throws Exception{Node n1 = db.getNodeById(1);Node gd = db.createNode(fh);gd.setProperty("name", "農業銀行廣東分行");n1.createRelationshipTo(gd, sj);gd.createRelationshipTo(n1, xj);Node hn = db.createNode(fh);hn.setProperty("name", "農業銀行湖南分行");n1.createRelationshipTo(hn, sj);hn.createRelationshipTo(n1, xj);Node hb = db.createNode(fh);hb.setProperty("name", "農業銀行湖北分行");n1.createRelationshipTo(hb, sj);hb.createRelationshipTo(n1, xj);Node zj = db.createNode(fh);zj.setProperty("name", "農業銀行浙江分行");n1.createRelationshipTo(zj, sj);zj.createRelationshipTo(n1, xj);}/*** 初始化工商銀行分行數據*/static void init3(GraphDatabaseService db)throws Exception{Node n1 = db.getNodeById(2);Node gd = db.createNode(fh);gd.setProperty("name", "工商銀行廣東分行");n1.createRelationshipTo(gd, sj);gd.createRelationshipTo(n1, xj);Node hn = db.createNode(fh);hn.setProperty("name", "工商銀行湖南分行");n1.createRelationshipTo(hn, sj);hn.createRelationshipTo(n1, xj);Node hb = db.createNode(fh);hb.setProperty("name", "工商銀行湖北分行");n1.createRelationshipTo(hb, sj);hb.createRelationshipTo(n1, xj);}/*** 初始化農業銀行廣東分行以下的支行數據*/static void init4(GraphDatabaseService db)throws Exception{Node n1 = db.getNodeById(3);Node th = db.createNode(zh);th.setProperty("name", "農業銀行天河支行營業部");n1.createRelationshipTo(th, sj);th.createRelationshipTo(n1, xj);Node yt = db.createNode(zh);yt.setProperty("name", "農業銀行燕塘支行");n1.createRelationshipTo(yt, sj);yt.createRelationshipTo(n1, xj);Node thb = db.createNode(zh);thb.setProperty("name", "農業銀行天河北路支行");n1.createRelationshipTo(thb, sj);thb.createRelationshipTo(n1, xj);Node sp = db.createNode(zh);sp.setProperty("name", "農業銀行石牌東路支行");n1.createRelationshipTo(sp, sj);sp.createRelationshipTo(n1, xj);Node hy = db.createNode(zh);hy.setProperty("name", "農業銀行華苑支行");n1.createRelationshipTo(hy, sj);hy.createRelationshipTo(n1, xj);}/*** start a=node(13) MATCH (a)<-[:SJ*1..3]-(b) return a,b (往上找三級，一共四級)* start a=node(1) MATCH (a)-[:SJ*1..3]->(b) return a,b (往下找三級，一共四級)*/public static void main(String[] args) throws Exception{GraphDatabaseService db = new GraphDatabaseFactory().newEmbeddedDatabase("/home/admin/db/neo4j");Transaction tx = db.beginTx();init1(db);init2(db);init3(db);init4(db);tx.success();tx.close();} }
這里數據的路徑是：/home/admin/db/neo4j

cd?neo4j-community-2.2.3/conf

vim neo4j-server.properties 文件。把數據庫文件夾改為上面的路徑，然后，重新啟動neo4j

訪問

http://127.0.0.1:7474

輸入默認的username/password neo4j/neo4j

然后。改動默認password

就可以查詢

以下給幾個查詢語句

查詢全部：match a return a

查詢全部標簽為'分行'的數據 match (a:分行) return a

start a=node(1) MATCH (a)-[:SJ*1..3]->(b) return a,b (從node id=1開始，往下找三級，一共四級)

start a=node(13) MATCH (a)<-[:SJ*1..3]-(b) return a,b (從node id=13開始。往上找三級。一共四級)

總結：neo4j非常適合保存有層級關系的數據，比方說：無限極分類

轉載于:https://www.cnblogs.com/blfbuaa/p/7353515.html

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