elasticsearch新建索引、mapping映射、删除数据级联删除es对应的索引

点击查看在Centos7中安装elasticsearch6.3

点击查看elasticsearch安装head插件

一、启动elasticsearch，再进入head目录，执行npm run start 启动插件 然后新建索引

put http://192.168.1.112:9200/test2/
{
  "settings": {
    "number_of_shards": 1,
    "number_of_replicas": 0,
    "index.analysis.analyzer.default.type": "ik_max_word"
  },
  "mappings": {
    "my": {
      "properties": {
        "id": {
          "type": "long"
        },
        "name": {
          "type": "text"
        },
        "content": {
          "type": "text"
        }
      }
    }
  }
}

创建索引后如图：

二、建立maven项目,引入依赖

   <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-core</artifactId>
       <version>2.10.0</version>
   </dependency>
   <!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api -->
   <dependency>
       <groupId>org.apache.logging.log4j</groupId>
       <artifactId>log4j-api</artifactId>
       <version>2.10.0</version>
   </dependency>

   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</artifactId>
       <version>5.1.47</version>
   </dependency>
   <dependency>
       <groupId>org.elasticsearch.client</groupId>
       <artifactId>transport</artifactId>
       <version>6.3.0</version>
   </dependency>
   <dependency>
       <groupId>org.elasticsearch.client</groupId>
       <artifactId>transport</artifactId>
       <version>6.3.0</version>
   </dependency>
   <dependency>
       <groupId>org.elasticsearch</groupId>
       <artifactId>elasticsearch</artifactId>
       <version>6.3.0</version>
   </dependency>

三、连接 elasticsearch服务 生成索引

public class EsIndex {

    private static String host="192.168.1.112"; 
    private static int port=9300;

    public static void main(String[] args) {
        DbUtil dbUtil=new DbUtil();
		// state为1 ：已经根据地址和提取码生成信息更新到数据库中了  is_index=false:尚未生成索引
        String sql="select id,name,content from t_article where state=1 and is_index=false limit 0,100";
        Connection con=null;
        TransportClient client=null;
        try{
            con=dbUtil.getCon();
			//创建客户端  链接使用tcp协议即9300
            client=new PreBuiltTransportClient(Settings.EMPTY)
                    .addTransportAddress(new TransportAddress(InetAddress.getByName(host),port));
            PreparedStatement pstmt = con.prepareStatement(sql);
            ResultSet rs = pstmt.executeQuery();
            while(rs.next()){
                String id = rs.getString("id");
                String name = rs.getString("name");
                String content = rs.getString("content");
                Map<String,Object> map=new HashMap<String,Object>();
                map.put("id",id);
                map.put("name",name);
                map.put("content",content);
				//通过prepareIndex增加文档  参数为Map<String,Object>
                IndexResponse indexResponse = client.prepareIndex("test2", "my")
                        .setSource(map)
                        .get();
                int status = indexResponse.status().getStatus();
                if(status==201){
                    System.out.println("【执行成功】=="+name);
                }else{
                    System.out.println("【执行失败】==id:"+id);
                }
                String updateSql="update t_article set is_index=true where id="+id;
                PreparedStatement updatePstmt= con.prepareStatement(updateSql);
                updatePstmt.executeUpdate();
            }
        }catch(Exception e){
            e.printStackTrace();
        }finally {
            try {
                client.close();
                dbUtil.closeCon(con);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

执行前，这几条数据的状态是 尚未生成索引，如下图：

执行以上代码后：

再看elasticsearch这边，也有了四条新的数据：

四、删除数据和es索引

Controller:

/**
     * 删除帖子信息
     * @param id
     * @return
     * @throws Exception
     */
    @RequestMapping("/delete")
    public Map<String,Object> delete(Integer id)throws Exception{
        articleService.delete(id);
        // 对应的索引信息也要删除
        articleService.deleteIndex(String.valueOf(id));
        Map<String,Object> resultMap=new HashMap<String,Object>();
        resultMap.put("success",true);
        return resultMap;
    }

    /**
     * 多选删除
     * @param ids
     * @return
     * @throws Exception
     */
    @RequestMapping("/deleteSelected")
    public Map<String,Object> deleteSelected(String ids)throws Exception{
        String[] idsStr = ids.split(",");
        for(int i=0;i<idsStr.length;i++){
            String articleId=idsStr[i];
            articleService.delete(Integer.parseInt(articleId));
            articleService.deleteIndex(String.valueOf(articleId));
        }
        Map<String,Object> resultMap=new HashMap<String,Object>();
        resultMap.put("success",true);
        return resultMap;
    }

ServiceImpl:

@Override
    public void deleteIndex(String id) {
        QueryBuilder queryBuilder=QueryBuilders.termQuery("id",id); //注意 这里的id不是_id,而是我们自己的id(业务上的)
        DeleteQuery deleteQuery=new DeleteQuery();  //
        deleteQuery.setIndex("test2");
        deleteQuery.setType("my");
        deleteQuery.setQuery(queryBuilder);
        elasticsearchTemplate.delete(deleteQuery);
    }

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