今天想使用一下Hive的图形化工具HWI,我的Hive是0.12.0版本。
该版本已经集成了HWI的JAR包,在$HIVE_HOME/lib下的hive–hwi-0.12.0.war。
配置文件也使用默认的即可,
jsp content for Hive Web Interface</description>
现在要做的就是添加apache ant的编译工具,不安装则会报错
Problem accessing /hwi/. Reason:
No Java compiler available
安装方法不做介绍了,网上很多。
安装完后需要设置path:
,但是这个方法不好使,需要把
- ant-launcher.jar
- ant.jar
这两个jar包拷贝到$HIVE_HOME/lib下,才能使用。
启动HWI命令:
hive –service hwi
然后访问:http://IP:9999/hwi/即可
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想通过JAVA代码来访问hive,则需要开启service服务:hive –service hiveserver
简单的Java代码实现;
—-通过Class.forName(“org.apache.hadoop.hive.jdbc.HiveDriver”);加载hive驱动
—-通过Connection conn = DriverManager.getConnection(“jdbc:hive://localhost:10000/default”,””,””);建立与数据库的连接
eg:
package hive.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class HiveJdbcDriver {
public static void main(String[] args) throws Exception {
Class.forName(“org.apache.hadoop.hive.jdbc.HiveDriver”);
Connection conn = DriverManager.getConnection(“jdbc:hive://localhost:1000/default”,””,””);
Statement stmt = conn.createStatement();
String tablename = “u_data_new”;
String quary_sql = “select weekday,count(*) from ” + tablename + ” group by weekday”;
ResultSet rs = stmt.executeQuery(quary_sql);
while(rs.next()){
System.out.println(“weekday: “+rs.getInt(1)+”count: “+rs.getInt(2));
}
}
}
result:
weekday: 2 count: 13579
weekday: 3 count: 14430
weekday: 4 count: 15114
weekday: 5 count: 14743
weekday: 6 count: 18229
weekday: 7 count: 11651
hive执行结果:
hive> select weekday,count(*) from u_data_new group by weekday;
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HIVE表导入数据的方式:
http://flyingdutchman.iteye.com/blog/1868600
http://www.cnblogs.com/viviman/archive/2013/01/29/2881784.html