hive javaapi 002

默认开启10000端口
开启前，编辑hive-site.xml设置impersonation，防止hdfs权限问题，这样hive server会以提交用户的身份去执行语句，如果设置为false，则会以起hive server daemon的admin user来执行语句

<property>
  <name>hive.server2.enable.doAs</name>
  <value>false</value>
</property>  

pom.xml

<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">
  <modelVersion>4.0.</modelVersion>

  <groupId>xinwei</groupId>
  <artifactId>Hive</artifactId>
  <version>0.0.-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>Hive</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.</version>
      <scope>test</scope>
    </dependency>

    <dependency>
            <groupId>org.apache.hive</groupId>
            <artifactId>hive-jdbc</artifactId>
            <version>0.14.</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-common</artifactId>
            <version>2.4.</version>
        </dependency>
        <dependency>
            <groupId>jdk.tools</groupId>
            <artifactId>jdk.tools</artifactId>
            <version>1.8</version>
            <scope>system</scope>
            <systemPath>${JAVA_HOME}/lib/tools.jar</systemPath>
        </dependency>
  </dependencies>
</project>

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
//Hive0.11.0版本提供了一个全新的服务：HiveServer2，这个很好的解决HiveServer存在的安全性、并发性等问题。这个服务启动程序在${HIVE_HOME}/bin/hiveserver2里面，你可以通过下面的方式来启动HiveServer2服务：
//nohup ./hive --service hiveserver2 >/dev/null 2>1 &
//默认开启10000端口
//开启前，编辑hive-site.xml设置impersonation，防止hdfs权限问题，这样hive server会以提交用户的身份去执行语句，如果设置为false，则会以起hive server daemon的admin user来执行语句
public class HiveTest {
    private static String driverName = "org.apache.hive.jdbc.HiveDriver";
    private static String url = "jdbc:hive2://192.168.231.137:10000/default";
    private static String username = "hadoop";
    private static String password = "hadoop";
    private static Connection conn = null;
    private static Statement stmt = null;
    private static String sql = "";
    private static ResultSet res = null;
    static {
        try {
            Class.forName(driverName);
            conn = DriverManager.getConnection(url, username, password);
            stmt = conn.createStatement();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }  

    public static void main(String[] args) throws Exception {
        dropTable("hivetest");
        createTable("hivetest");
        showTables("hivetest");
        describeTables("hivetest");
        insert("hivetest", new String[]{"","tom",""});
        insert("hivetest", new String[]{"","zhangshan",""});
        insert("hivetest", new String[]{"","lisi",""});
        insert("hivetest", new String[]{"","lucy",""});
        selectData("hivetest");
//        dropTable("hivetest");
    }  

    // 查询数据
    public static void selectData(String tableName) throws SQLException {
        sql = "select * from " + tableName;
        res = stmt.executeQuery(sql);
        while (res.next()) {
            System.out.println(res.getInt() + "\t" + res.getString());
        }
    }  

    // 添加数据
    public static void insert(String tableName, String[] datas) throws SQLException {
        sql = "insert into table " + tableName + " values ('" + datas[] + "','" + datas[] + "'," + Integer.valueOf(datas[]) + ")";
        stmt.execute(sql);
    }  

    // 查询表结构
    public static void describeTables(String tableName) throws SQLException {
        sql = "describe " + tableName;
        res = stmt.executeQuery(sql);
        while (res.next()) {
            System.out.println(res.getString() + "\t" + res.getString());
        }
    }  

    // 查看表
    public static void showTables(String tableName) throws SQLException {
        sql = "show tables '" + tableName + "'";
        res = stmt.executeQuery(sql);
        if (res.next()) {
            System.out.println(res.getString());
        }
    }  

    // 创建表
    public static void createTable(String tableName) throws SQLException {
        sql = "create table " + tableName + " (id string, name string,age int)  row format delimited fields terminated by '\t'";
        stmt.execute(sql);
    }  

    // 删除表
    public static String dropTable(String tableName) throws SQLException {
        // 创建的表名
        sql = "drop table " + tableName;
        stmt.execute(sql);
        return tableName;
    }
}  

//
//hivetest
//id    string
//name    string
//age    int
//10000    tom
//10001    zhangshan
//10002    lisi
//10003    lucy