Hive HiveServer2+beeline+jdbc客户端访问操作

HiveServer

查看/home/hadoop/bigdatasoftware/apache-hive-0.13.1-bin/bin目录文件，其中有hiveserver2

启动hiveserver2，如下图：

打开多一个终端，查看进程

有RunJar进程说明hiveserver正在运行；

beeline

启动beeline

连接到jdbc

---

!connect jdbc:hive2://hadoop-001:10000 hadoop hadooporg.apache.hive.jdbc.HiveDriver;

---

然后就可以进行一系列操作了

 IDEA上jdbc客户端操作hive

Using JDBC

You can use JDBC to access data stored in a relational database or other tabular format.

1. Load the HiveServer2 JDBC driver. As of 1.2.0 applications no longer need to explicitly load JDBC drivers using Class.forName().

   For example:

   ---

   Class.forName("org.apache.hive.jdbc.HiveDriver");

   ---

2. Connect to the database by creating a Connection object with the JDBC driver.

   For example:

   ---

   Connection cnct = DriverManager.getConnection("jdbc:hive2://<host>:<port>", "<user>", "<password>");

   ---

   The default <port> is 10000. In non-secure configurations, specify a <user> for the query to run as. The <password> field value is ignored in non-secure mode.

   ---

   Connection cnct = DriverManager.getConnection("jdbc:hive2://<host>:<port>", "<user>", "");

   ---

   In Kerberos secure mode, the user information is based on the Kerberos credentials.

3. Submit SQL to the database by creating a Statement object and using its executeQuery() method.

   For example:

   ---

   Statement stmt = cnct.createStatement();
   ResultSet rset = stmt.executeQuery("SELECT foo FROM bar");

   ---

4. Process the result set, if necessary.

These steps are illustrated in the sample code below.

代码如下：

package com.gec.demo;

import java.sql.SQLException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.DriverManager;

public class HiveJdbcClient {
    private static final String DRIVERNAME = "org.apache.hive.jdbc.HiveDriver";

    /**
     * @param args
     * @throws SQLException
     */
    public static void main(String[] args) throws SQLException {
        try {
            Class.forName(DRIVERNAME);
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            System.exit(1);
        }
        //replace "hive" here with the name of the user the queries should run as
        Connection con = DriverManager.getConnection("jdbc:hive2://hadoop-001:10000/default", "hadoop", "hadoop");
        Statement stmt = con.createStatement();
        String tableName = "dept";
//        stmt.execute("drop table if exists " + tableName);
//        stmt.execute("create table " + tableName + " (key int, value string)");
        // show tables
        String sql = "show tables '" + tableName + "'";
        System.out.println("Running: " + sql);
        ResultSet res = stmt.executeQuery(sql);
        if (res.next()) {
            System.out.println(res.getString(1));
        }
        // describe table
        sql = "describe " + tableName;
        System.out.println("Running: " + sql);
        res = stmt.executeQuery(sql);
        while (res.next()) {
            System.out.println(res.getString(1) + "\t" + res.getString(2));
        }

        // load data into table
        // NOTE: filepath has to be local to the hive server
        // NOTE: /tmp/a.txt is a ctrl-A separated file with two fields per line
//        String filepath = "/";
//        sql = "load data local inpath '" + filepath + "' into table " + tableName;
//        System.out.println("Running: " + sql);
//        stmt.execute(sql);

        // select * query
        sql = "select * from " + tableName;
        System.out.println("Running: " + sql);
        res = stmt.executeQuery(sql);
        while (res.next()) {
            System.out.println(String.valueOf(res.getInt(1)) + "\t" + res.getString(2));
        }

        // regular hive query
        sql = "select count(1) from " + tableName;
        System.out.println("Running: " + sql);
        res = stmt.executeQuery(sql);
        while (res.next()) {
            System.out.println(res.getString(1));
        }
    }
}

pom.xml配置文件如下：

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>BigdataStudy</artifactId>
        <groupId>com.gec.demo</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>HiveJdbcClient</artifactId>

    <name>HiveJdbcClient</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <hadoop.version>2.7.2</hadoop.version>
        <!--<hive.version> 0.13.1</hive.version>-->
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.8.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-common</artifactId>
            <version>2.7.2</version>
        </dependency>

        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-hdfs</artifactId>
            <version>${hadoop.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>${hadoop.version}</version>
        </dependency>

        <dependency>
            <groupId>org.apache.hive</groupId>
            <artifactId>hive-jdbc</artifactId>
            <version>0.13.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hive</groupId>
            <artifactId>hive-exec</artifactId>
            <version>0.13.1</version>
        </dependency>

    </dependencies>
</project>