1.在终端启动hiveserver2
#hiveserver2
2.使用beeline连接hive
另外打开一个终端，输入如下命令（xavierdb必须是已经存在的数据库）
#beeline -u jdbc:hive2://localhost:10000/xavierdb -n hive -p hive
3.添加maven依赖
<!-- https://mvnrepository.com/artifact/org.apache.hadoop.hive/hive-jdbc --> <dependency> <groupId>org.apache.hive</groupId> <artifactId>hive-jdbc</artifactId> <version>1.1.0</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.9</version> </dependency> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-common</artifactId> <version>2.6.0</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.hadoop/hadoop-client --> <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-client</artifactId> <version>2.6.0</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.hive/hive-metastore --> <dependency> <groupId>org.apache.hive</groupId> <artifactId>hive-metastore</artifactId> <version>1.1.0</version> </dependency> <!-- https://mvnrepository.com/artifact/org.apache.hive/hive-metastore --> <dependency> <groupId>org.apache.hive</groupId> <artifactId>hive-exec</artifactId> <version>1.1.0</version> </dependency>
出现过的错误： Error: Could not open client transport with JDBC Uri: jdbc:hive2://localhost:10000/default
解决办法：检查发现运行beeline时Driver版本Driver: Hive JDBC (version 1.1.0-cdh5.16.1)比maven依赖中的Driver版本低，将maven版本调至1.1.0问题解决
Java API测试：
注意：这里的url必须是beeline值中使用的url
package TestOption;
import org.junit.Test;
import org.junit.After;
import org.junit.Before;
import java.sql.*;
/**
* @Author:Xavier
* @Data:2019-02-18 11:43
**/
public class HiveOption {
private static String driverName = "org.apache.hive.jdbc.HiveDriver";
private static String url = "jdbc:hive2://yourhost:10000/yourdatabase";
private static Connection con = null;
private static Statement state = null;
private static ResultSet res = null;
//加载驱动,创建连接
@Before
public void init() throws ClassNotFoundException, SQLException {
Class.forName(driverName);
con = DriverManager.getConnection(url, "hive", "hive");
state = con.createStatement();
}
//创建数据库
@Test
public void CreateDb() throws SQLException {
state.execute("create database xavierdb1");
}
// 查询所有数据库
@Test
public void showtDb() throws SQLException {
res = state.executeQuery("show databases");
while (res.next()) {
System.out.println(res.getString(1));
}
}
// 删除数据库
@Test
public void dropDb() throws SQLException {
state.execute("drop database if exists xavierdb1");
}
/*
*
*
* 内部表基本操作
*
*
* */
// 创建表
@Test
public void createTab() throws SQLException {
state.execute("create table if not exists student ( " +
"name string , " +
"age int , " +
"agent string ," +
"adress struct<street:STRING,city:STRING>) " +
"row format delimited " +
"fields terminated by ',' " +//字段与字段之间的分隔符
"collection items terminated by ':'" +//一个字段各个item的分隔符
"lines terminated by '
' ");//行分隔符
}
// 查询所有表
@Test
public void showTab() throws SQLException {
res = state.executeQuery("show tables");
while (res.next()) {
System.out.println(res.getString(1));
}
}
// 查看表结构
@Test
public void descTab() throws SQLException {
res = state.executeQuery("desc emp");
while (res.next()) {
System.out.println(res.getString(1) + " " + res.getString(2));
}
}
// 加载数据
@Test
public void loadData() throws SQLException {
String infile = " '/root/studentData' ";
state.execute("load data local inpath " + infile + "overwrite into table student");
}
// 查询数据
@Test
public void selectTab() throws SQLException {
res = state.executeQuery("select * from student1");
while (res.next()) {
System.out.println(
res.getString(1) + "-" +
res.getString(2) + "-" +
res.getString(3) + "-" +
res.getString(4));
}
}
// 统计查询（会运行mapreduce作业，资源开销较大）
@Test
public void countData() throws SQLException {
res = state.executeQuery("select count(1) from student");
while (res.next()) {
System.out.println(res.getInt(1));
}
}
// 删除表
@Test
public void dropTab() throws SQLException {
state.execute("drop table emp");
}
/*
* 外部表基本操作
*
*外部表删除后，hdfs文件系统上的数据还在，
*重新创建同路径外部表后，其数据仍然存在
*
* */
//创建外部表
@Test
public void createExTab()