kylin java查询

最新推荐文章于 2023-02-14 08:54:34 发布

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最新推荐文章于 2023-02-14 08:54:34 发布

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本文链接：https://blog.csdn.net/linlinv3/article/details/53893144

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kylin 提供了java查询的api接口，具体有什么接口参见官网：http://kylin.apache.org/docs16/

这里介绍一下查询接口

1、使用httpClient post进行数据查询

  
  package kylin;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import net.sf.json.JSONObject;
import org.apache.axis.encoding.Base64;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class kylinPost {
	
	private String encoding = "UTF-8";
	static String ACCOUNT = "ADMIN";
    static String PWD = "KYLIN";
    /**
     * 使用httpcline 进行post访问
     * @throws IOException
     */
	public void requestByPostMethod() throws IOException{
        CloseableHttpClient httpClient = this.getHttpClient(); 
        try {
        	//创建post方式请求对象  
            String url ="http://192.168.0.222:7070/kylin/api/query";
            HttpPost httpPost = new HttpPost(url);   
            String sql = "select a.part_dt ,sum(a.price) as sum_price ,max(a.price) as max_price,count(*) as cnt from kylin_sales a "
            		+ " inner join kylin_cal_dt b  on  a.part_dt = b.cal_dt "
            		+ " inner join kylin_category_groupings c on a.lstg_site_id  = c.site_id and a.leaf_categ_id = c.leaf_categ_id "
            		+ " group by a.part_dt   ;";
            // 接收参数json列表  (kylin 只接受json格式数据)
            JSONObject jsonParam = new JSONObject();  
            jsonParam.put("sql", sql);   
            jsonParam.put("limit", "20");  
            jsonParam.put("project","learn_kylin");   
            StringEntity sentity = new StringEntity(jsonParam.toString(),encoding);//解决中文乱码问题    
            sentity.setContentEncoding(encoding);    
            sentity.setContentType("application/json");    
            httpPost.setEntity(sentity);    
            //设置header信息  
            //指定报文头【Content-type】、【User-Agent】 
            httpPost.setHeader("Content-type", "application/json;charset=utf-8");  
            httpPost.setHeader("Authorization", this.authCode());  
            System.out.println("POST 请求...." + httpPost.getURI());
            //执行请求
            CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
            try{
                HttpEntity entity = httpResponse.getEntity();
                if (null != entity){
                    //按指定编码转换结果实体为String类型  
                    String  body = EntityUtils.toString(entity, encoding);  
                    JSONObject obj = JSONObject.fromObject(body);
                    System.out.println(body);
                    System.out.println(obj.get("results"));
                }
            } finally{
                httpResponse.close();
            }
             
        } catch( UnsupportedEncodingException e){
            e.printStackTrace();
        }
        catch (IOException e) {
            e.printStackTrace();
        }finally{
               this.closeHttpClient(httpClient);                
        }
    }
	  /**
     * kylin 是base64加密的，访问时候需要加上加密码
     * @return
     */
    private String authCode(){
    	  String auth = ACCOUNT + ":" + PWD;
          String code = "Basic "+new String(new Base64().encode(auth.getBytes()));
          return code;
    }
	/**
	 * 创建httpclient对象
	 * @return
	 */
	 private CloseableHttpClient getHttpClient(){
	        return HttpClients.createDefault();
	 }
	 /**
	  * 关闭链接
	  * @param client
	  * @throws IOException
	  */
	 private void closeHttpClient(CloseableHttpClient client) throws IOException{
	        if (client != null){
	            client.close();
	        }
	 }
	public static void main(String[] args) throws IOException{
		kylinPost ky = new kylinPost();
		ky.requestByPostMethod();
	}
}

2、使用jdbc进行查询

  
  package kylin;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import org.apache.kylin.jdbc.Driver;
public class KylinJdbc {
	public void connentJdbc() throws InstantiationException, IllegalAccessException, ClassNotFoundException, SQLException{
		Driver driver = (Driver) Class.forName("org.apache.kylin.jdbc.Driver").newInstance();
		Properties info = new Properties();
		info.put("user", "ADMIN");
		info.put("password", "KYLIN");
		Connection conn = driver.connect("jdbc:kylin://192.168.0.222:7070/learn_kylin", info);
		Statement state = conn.createStatement();
		ResultSet resultSet = state.executeQuery("select * from kylin_sales limit 10 ");
		while (resultSet.next()) {
		     resultSet.getString(1);
		     System.out.println(resultSet.getString(1));
		}
	}
	
	public static void main(String[] args) throws IOException, InstantiationException, IllegalAccessException, ClassNotFoundException, SQLException{
		KylinJdbc ky = new KylinJdbc();
		ky.connentJdbc();
	}
}