Java集成presto查詢方式

更新時(shí)間：2022年06月20日 10:19:19 作者：luoyuan323

這篇文章主要介紹了Java集成presto查詢方式，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

Java集成presto查詢

1.pom文件引入相關(guān)jar

    <dependency>
            <groupId>com.facebook.presto</groupId>
            <artifactId>presto-jdbc</artifactId>
            <version>0.234.1</version>
        </dependency>

2.application.yml配置presto相關(guān)

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

3.獲取連接與測(cè)試

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 通過(guò) jdbc 連接
         * 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);
        /*設(shè)置連接的數(shù)據(jù)源類型
         * 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);
            // 獲取列數(shù)
            ResultSetMetaData metaData = rs.getMetaData();
            int columnCount = metaData.getColumnCount();
            // 遍歷ResultSet中的每條數(shù)據(jù)
            while (rs.next()) {
                JSONObject jsonObj = new JSONObject();
                // 遍歷每一列
                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 {
            //關(guān)閉資源(先開(kāi)后關(guān))
            JdbcUtil.close(rs, ps, con);
        }
        return array;
    }
}

Java程序訪問(wèn)presto

pom.xml中引入presto-jdbc

<dependency>
<groupId>com.facebook.presto</groupId>
<artifactId>presto-jdbc</artifactId>
<version>0.267</version>
</dependency>

/**
 * @ 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沒(méi)有設(shè)置SSL認(rèn)證，只需填寫用戶名，不需要填寫密碼。
        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();
    }
}