J2EE之wildfly 实践8 -- 集成NoSql(mongodb)

实践背景:在wildfly中使用hibernate-ogm框架操作mongodb数据库

条件:　　

• hibernate-ogm-wildfly10-module.zip：https://pan.baidu.com/s/1kVE1Rvh 密码：d2hl
• 安装mongodb数据库，网上自搜索教程。

 (转载请注明来源:cnblogs coder-fang)

步骤:

1. 　　将hibernate-ogm-wildfly10-module.zip解压到 WILDFLY10_HOME/modules中，产生WILDFLY10_HOME/modules/org文件夹。
2. 　　添加一个ExampleDS数据源，可随意创建，修改standalone.xml，在datasources节点下创建，代码如下:

   <datasource jta="true" jndi-name="java:/ExampleDS" pool-name="ExampleDS" enabled="true" use-ccm="true">
                       <connection-url>null</connection-url>
                       <driver-class>org.h2.Driver</driver-class>
                       <driver>h2</driver>
                       <security>
                           <user-name>sa</user-name>
                           <password>sa</password>
                       </security>
                   </datasource>

3.    修改默认绑定的数据源为ExampleDS，即在standalone.xml中的<subsystem xmlns="urn:jboss:domain:ee:4.0">节点下修改代码:

   <default-bindings context-service="java:jboss/ee/concurrency/context/default" datasource="java:/ExampleDS" managed-executor-service="java:jboss/ee/concurrency/executor/default" managed-scheduled-executor-service="java:jboss/ee/concurrency/scheduler/default" managed-thread-factory="java:jboss/ee/concurrency/factory/default"/>

   注:此时即可启动服务，服务已支持hibernate-ogm模块.

4. 创建实体类，代码如下:

   package com.sj.mrics.db.model;
   
   import java.io.Serializable;
   
   import java.util.Date;
   
   import javax.persistence.Entity;
   import javax.persistence.GeneratedValue;
   import javax.persistence.GenerationType;
   import javax.persistence.Id;
   import javax.persistence.Table;
   import javax.persistence.Temporal;
   import javax.persistence.TemporalType;
   
   
   import org.hibernate.annotations.Type;
   
   import com.fasterxml.jackson.databind.annotation.JsonSerialize;
   import com.sj.mrics.util.JsonDateSerializer;
   
   
   @Entity
   @Table(name = "weblog")
   public class WebLog implements Serializable{
       /**
        * weblog即为数据库中的collection名称
        */
       private static final long serialVersionUID = -914369413813954644L;
       @Id
       @GeneratedValue(strategy = GenerationType.IDENTITY)
       @Type(type = "objectid")
       private String id;
       private String msg;
       private String level;
       @JsonSerialize(using=JsonDateSerializer.class)
       private Date uptime;
       public String getId() {
           return id;
       }
       public void setId(String id) {
           this.id = id;
       }
       public String getMsg() {
           return msg;
       }
       public void setMsg(String msg) {
           this.msg = msg;
       }
       public String getLevel() {
           return level;
       }
       public void setLevel(String level) {
           this.level = level;
       }
       
       
       
       @Temporal(TemporalType.TIMESTAMP)
       public Date getUptime() {
           return uptime;
       }
       public void setUptime(Date uptime) {
           this.uptime = uptime;
       }
   }

5. pom.xml引入hibernate-ogm,代码如下:

   <dependency>
               <groupId>org.hibernate.ogm</groupId>
               <artifactId>hibernate-ogm-core</artifactId>
               <version>5.0.0.Final</version>
               <exclusions>
           <exclusion>
               <groupId>dom4j</groupId>
               <artifactId>dom4j</artifactId>
           </exclusion>
       </exclusions>
           </dependency>

6. 创建数据库访问的ejb代码，引用工程 wildfly 实践3 --DAS服务开发  ,在persistence.xml中增加一个unit代码如下:

   <persistence-unit name="mongo-log" transaction-type="JTA">
           <!-- Hibernate OGM provider -->
           <provider>org.hibernate.ogm.jpa.HibernateOgmPersistence</provider>
           <class>com.sj.mrics.db.model.WebLog</class>
           
           <properties>
               <property name="hibernate.transaction.jta.platform"
                         value="org.hibernate.service.jta.platform.internal.JBossAppServerJtaPlatform" />
                         
   　　

               <!-- 此处可以填写任何hibernate-ogm支持的Nosql数据库 -->

               <property name="hibernate.ogm.datastore.provider" value="mongodb" /> 
   
                <property name="hibernate.ogm.datastore.database" value="logdb"/>
                <property name="hibernate.ogm.datastore.host" value="192.168.50.123"/>             
               
           </properties>
       </persistence-unit>

7. 创建 访问数据库的ejb,代码如下:

   package com.sj.mrics.das;
   
   import java.util.List;
   
   import javax.ejb.Remote;
   import javax.ejb.Stateless;
   import javax.persistence.Query;
   
   
   import com.sj.mrics.dasinterface.QueryResult;
   import com.sj.mrics.dasinterface.WebLogManagerRemote;
   import com.sj.mrics.db.model.WebLog;
   import com.sj.mrics.util.MsgException;
   
   @Stateless
   @Remote
   public class WebLogManager  implements WebLogManagerRemote {
   
        @PersistenceContext(unitName="mongo-log")
       protected EntityManager em;
       
       @SuppressWarnings("unchecked")
       @Override
       public QueryResult<WebLog> listWebLog(int start, int max) {
           // TODO Auto-generated method stub
           QueryResult<WebLog> result = new QueryResult<>();
           result.setTotalRow((long) 0);
           
           try {            
               Query q = em.createQuery( "FROM WebLog w order by w.uptime desc", WebLog.class );
               
               if (start >= 0) {
                   q = q.setFirstResult(start);
               }
               if (max > 0) {
                   q = q.setMaxResults(max);
               }
               List<WebLog> logs = q.getResultList();
               result.setList(logs);
               result.setTotalRow((long) logs.size());
               em.flush();
               
           } catch (Exception e) {
               // TODO: handle exception
               e.printStackTrace();
               
           }
           return result;
       }
   
       @Override
       public void save(WebLog arg0) throws MsgException {
           // TODO Auto-generated method stub
           try {
               em.persist(arg0);
           } catch (Exception e) {
               // TODO: handle exception
               logger.error(e.getMessage());
               throw new MsgException("save failed");
           }
       }
   
   }

8. 打包部署jar时，需要将 manifest.mf加上属性，代码如下:

   Dependencies: org.hibernate.ogm:5.0 services,org.hibernate.ogm.mongodb:5.0 services

　　9.将此ejb部署到wildfly10中。

　　10. 调用ejb,代码如下:

QueryResult<WebLog> weblogs getWebLogManager().listWebLog(0, 10);

　　亲测可返回代码与插入数据。