如何在Java中集成Presto查询

Java集成presto查询

1.pom文件引入相关jar

    
            com.facebook.presto
            presto-jdbc
            0.234.1
        

2.application.yml配置presto相关

presto:
  url: xxxxxx
  username: root
  password: root
  port: 8088

3.获取连接与测试

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.sugon.xuanyuan.common.utils.StringUtils;
import com.sugon.xuanyuan.service.dataprovider.utils.JdbcUtil;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import java.sql.*;
import java.util.Properties;
/**
 * @Description:
 * @author: luoy
 * @date: 2020-06-24 09:45
 */
@Configuration
public class PrestoConnect {
    @Value("${presto.url}")
    private String server;
    @Value("${presto.port}")
    private String port;
    @Value("${presto.username}")
    private String username;
    @Value("${presto.password}")
    private String password;
    private Connection getConnection() throws Exception {
        /**
         * 功能：presto 通过 jdbc 连接
         * 示例：jdbc:presto://host:port/
         **/
        String jdbcurl = "jdbc:presto://" + server + ":" + port + "/";
        Connection conn ;
        Properties props = new Properties();
        Class.forName("com.facebook.presto.jdbc.PrestoDriver");
        props.setProperty("user", username);
        if (StringUtils.isNotBlank(password)) {
            props.setProperty("password", password);
            props.setProperty("SSL", "true");
            //props.setProperty("SSLTrustStorePath", SSLTrustStorePath);
            //props.setProperty("SSLTrustStorePassword", SSLTrustStorePassword);
            jdbcurl = String.format("jdbc:presto://%s:%s/", server, port);
        }
        conn = DriverManager.getConnection(jdbcurl, props);
        /*设置连接的数据源类型
         * 示例:mysql、hive
         */
        conn.setCatalog("hive");
        return conn;
    }
    public JSONArray getDataAll(String sql)
            throws Exception {
        JSONArray array = new JSONArray();
        Statement ps = null;
        ResultSet rs = null;
        Connection con = null;
        try {
            con = getConnection();
            ps = con.createStatement();
            rs = ps.executeQuery(sql);
            // 获取列数
            ResultSetMetaData metaData = rs.getMetaData();
            int columnCount = metaData.getColumnCount();
            // 遍历ResultSet中的每条数据
            while (rs.next()) {
                JSONObject jsonObj = new JSONObject();
                // 遍历每一列
                for (int i = 1; i <= columnCount; i++) {
                    String columnName = metaData.getColumnLabel(i);
                    String value = StringUtils.isBlank(rs.getString(columnName)) ? "" : rs.getString(columnName);
                    jsonObj.put(columnName, value);
                }
                array.add(jsonObj);
            }
        } catch (Exception e) {
            throw new Exception("ERROR:" + e.getMessage(), e);
        } finally {
            //关闭资源(先开后关)
            JdbcUtil.close(rs, ps, con);
        }
        return array;
    }
}

Java程序访问presto

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pom.xml中引入presto-jdbc

com.facebook.presto
presto-jdbc
0.267

/**
 * @ Author zhangsf
 * @CreateTime 2022/1/6 - 10:00 PM
 */
package presto;
 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
 
public class PrestoJdbcDemo {
    public static void main(String[] args) throws  Exception{
        //class.forname
        try {
            Class.forName("com.facebook.presto.jdbc.PrestoDriver");
        }catch (ClassNotFoundException e){
            e.printStackTrace();
        }
        //若presto没有设置SSL认证，只需填写用户名，不需要填写密码。
        Connection connection = DriverManager.getConnection("jdbc:presto://localhost:8080/mysql/tp_music","root",null);
        Statement stmt = connection.createStatement();
        ResultSet rs = stmt.executeQuery("select * from mysql.tp_music.singer limit 3");
        while (rs.next()) {
            System.out.println("name:"+rs.getString(2)+"  birth:"+rs.getString(5)+"  location:"+rs.getString(6));
        }
        rs.close();
        connection.close();
    }
}