1.引言
这里的Java操作Neo数据库使用的是嵌入式模式,Neo4j可分为嵌入式模式和服务端模式,两者的区别可以查看方案(https://blog.csdn.net/regan_hoo/article/details/78771888)
也可以查看《Neo4j实战 》这本书的第10章,上面有详细讲解(需要电子版的可以找我)。
我们构造一个案件的场景。比如一个案件中有多个嫌疑人,有的嫌疑人参与了多个案件。
2 程序代码
pom
org.neo4j
neo4j
3.3.5
Java代码
package neo4j;
import org.neo4j.graphdb.*;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.graphdb.index.Index;
import org.neo4j.graphdb.traversal.Evaluators;
import org.neo4j.graphdb.traversal.TraversalDescription;
import java.io.File;
import java.util.Iterator;
/**
* Created by cgz on 2018-04-17 15:29
* 描述:
*/
public class CaseInfoAs {
// private static final String DB_PATH = "testgraph.db";
private static final String DB_PATH = "E:\\soft\\neo4j-community-3.3.5\\data\\databases\\graph.db";
private GraphDatabaseService graphDB;
private enum RelTypes implements RelationshipType {
CRIME, LINK
}
public void init() {
graphDB = new GraphDatabaseFactory().newEmbeddedDatabase(new File(DB_PATH));
}
/**创建数据*/
public void create() {
Transaction tx = graphDB.beginTx();
Node case1 = graphDB.createNode(new CaseLabel("CASEINFO"));
case1.setProperty("name", "案件1");
case1.setProperty("address", "南山");
Node case2 = graphDB.createNode(new CaseLabel("CASEINFO"));
case2.setProperty("name", "案件2");
case2.setProperty("address", "福田");
Node case3 = graphDB.createNode(new CaseLabel("CASEINFO"));
case3.setProperty("name", "案件3");
case3.setProperty("address", "龙华");
Node userA = graphDB.createNode(new CaseLabel("PERSON"));
userA.setProperty("name", "A");
userA.setProperty("idcard", "150302198012228239");
userA.setProperty("tel", "13685246639");
Node userB = graphDB.createNode(new CaseLabel("PERSON"));
userB.setProperty("name", "B");
userB.setProperty("idcard", "370634199208304929");
userB.setProperty("tel", "13885246670");
Node userC = graphDB.createNode(new CaseLabel("PERSON"));
userC.setProperty("name", "C");
userC.setProperty("idcard", "430721198802065735");
userC.setProperty("tel", "13966704782");
Node userD = graphDB.createNode(new CaseLabel("PERSON"));
userD.setProperty("name", "D");
userD.setProperty("idcard", "522730198707118747");
userD.setProperty("tel", "13670478962");
Node userE = graphDB.createNode(new CaseLabel("PERSON"));
userE.setProperty("name", "E");
userE.setProperty("idcard", "622926198609158032");
userE.setProperty("tel", "13047829667");
Node userF = graphDB.createNode(new CaseLabel("PERSON"));
userF.setProperty("name", "F");
userF.setProperty("idcard", "500114197706138305");
userF.setProperty("tel", "13478296670");
Node userG = graphDB.createNode(new CaseLabel("PERSON"));
userG.setProperty("name", "G");
userG.setProperty("idcard", "500114106138305152");
userG.setProperty("tel", "13476670156");
Node userH = graphDB.createNode(new CaseLabel("PERSON"));
userH.setProperty("name", "H");
userH.setProperty("idcard", "500114197704751236");
userH.setProperty("tel", "13296156670");
case1.createRelationshipTo(userA, RelTypes.CRIME);
case1.createRelationshipTo(userB, RelTypes.CRIME);
case1.createRelationshipTo(userC, RelTypes.CRIME);
case1.createRelationshipTo(userD, RelTypes.CRIME);
case2.createRelationshipTo(userB, RelTypes.CRIME);
case2.createRelationshipTo(userC, RelTypes.CRIME);
case2.createRelationshipTo(userE, RelTypes.CRIME);
// case2.createRelationshipTo(userD, RelTypes.CRIME);
case3.createRelationshipTo(userF, RelTypes.CRIME);
case3.createRelationshipTo(userG, RelTypes.CRIME);
case3.createRelationshipTo(userH, RelTypes.CRIME);
tx.success();
tx.close();
}
public void search(String username) {
Transaction tx = graphDB.beginTx();
Node startNode = graphDB.findNode(new CaseLabel("PERSON"), "name", username);
Iterable iterable = startNode
.getRelationships(RelTypes.CRIME, Direction.INCOMING);
for (Relationship r : iterable) {
Node node = r.getStartNode();
long id = node.getId();
String name = (String)node.getProperty("name");
// String idcard = (String)node.getProperty("idcard");
// String tel = (String)node.getProperty("tel");
System.out.println(id + " " + name+ " ");
}
tx.success();
tx.close();
}
/**遍历查找**/
public void searchUser(String username) {
Transaction tx = graphDB.beginTx();
Node startNode = graphDB.findNode(new CaseLabel("PERSON"), "name", username);
// Node startNode = graphDB.findNode(new CaseLabel("PERSON"), "name", "B");
TraversalDescription td = graphDB.traversalDescription();
td.relationships(RelTypes.CRIME, Direction.OUTGOING);//沿着关系 TONG
td.depthFirst();//设置深度优先
// td.evaluator(Evaluators.excludeStartPosition());
//从开始节点开始
Iterable it = td.traverse(startNode).nodes();
for (Node node : it) {
long id = node.getId();
if( node.hasLabel( new CaseLabel("PERSON") )) {
String name = (String)node.getProperty("name");
String idcard = (String)node.getProperty("idcard");
String tel = (String)node.getProperty("tel");
System.out.println(id + " " + name+ " " + idcard + " " + tel);
} else {
// String name = (String)node.getProperty("name");
// String address = (String)node.getProperty("address");
// System.out.println(id + " " + name+ " " + address);
}
}
tx.success();
tx.close();
}
/**查询所有案件信息*/
public void searchAllCase() {
Transaction tx = graphDB.beginTx();
ResourceIterator iterator = graphDB.findNodes(new CaseLabel("CASEINFO"));
for (ResourceIterator it = iterator; it.hasNext(); ) {
Node node = it.next();
long id = node.getId();
String name = (String)node.getProperty("name");
String address = (String)node.getProperty("address");
System.out.println(id + " " + name+ " " + address);
}
tx.success();
tx.close();
}
/**查询所有作案人员信息*/
public void searchAllPerson() {
Transaction tx = graphDB.beginTx();
ResourceIterator iterator = graphDB.findNodes(new CaseLabel("PERSON"));
for (ResourceIterator it = iterator; it.hasNext(); ) {
Node node = it.next();
long id = node.getId();
String name = (String)node.getProperty("name");
String idcard = (String)node.getProperty("idcard");
String tel = (String)node.getProperty("tel");
System.out.println(id + " " + name+ " " + idcard + " " + tel);
}
tx.success();
tx.close();
}
public static void main(String[] args) {
CaseInfoAs as = new CaseInfoAs();
as.init();
// as.create();
as.search("A");
// as.search1();
// as.searchAllCase();
// as.searchUser("A");
}
}
class CaseLabel implements Label {
private String name;
public CaseLabel(String name) {
this.name = name;
}
public String name(){
return name;
}
}
生成的图