java操作hive

版本

hadoop 2.7.4
hive 1.2.2

启动hive远程服务

hiveserver2 默认开启10000端口

1
2
3
4
5
hiveserver2
hive --service hiveserver2
# 验证是否启动成功
netstat -ntulp |grep 10000

依赖的jar包

java.lang.ClassNotFoundException: org.apache.hive.jdbc.HiveDriver

缺少hive-jdbc依赖

1
2
3
4
5
<dependency>
  <groupId>org.apache.hive</groupId>
  <artifactId>hive-jdbc</artifactId>
  <version>${hive.version}</version>
</dependency>

java.lang.NoClassDefFoundError: org/apache/hadoop/conf/Configuration

原因：缺少hadoop-common依赖

1
2
3
4
5
<dependency>
  <groupId>org.apache.hadoop</groupId>
  <artifactId>hadoop-common</artifactId>
  <version>${hadoop.version}</version>
</dependency>

jdbc工具类

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
package siys16877.HiveDemo.utils;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class JDBCUtils {
	private static String driver = "org.apache.hive.jdbc.HiveDriver";
	private static String url = "jdbc:hive2://127.0.0.1:10000/default";
	//注册驱动
	static{
		try {
			Class.forName(driver);
			System.out.println("驱动加载成功");
		} catch (ClassNotFoundException e) {
			System.out.println("驱动加载失败");
			throw new ExceptionInInitializerError(e);
		}
	}
	//获取连接
	public static Connection getConnection(){
		try {
			System.out.println("获取连接成功");
			return DriverManager.getConnection(url);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			System.out.println("获取连接失败");
			e.printStackTrace();
		}
		return null;
	}
	//释放资源
	public static void release(Connection conn,Statement st,ResultSet rs){
		if(rs != null){
			try {
				rs.close();
				System.out.println("release rs done !");
			} catch (SQLException e) {
				e.printStackTrace();
			}finally{
				rs = null;
			}
		}
		if(st != null){
			try {
				st.close();
				System.out.println("release st done ! ");
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				st = null;
			}
		}
		if(conn != null){
			try {
				conn.close();
				System.out.println("release conn done !");
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				conn = null;
			}
		}
	}
}

hive-jdbc-demo测试类

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
package siys16877.HiveDemo.hive;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import siys16877.HiveDemo.utils.JDBCUtils;
public class Demo {
	public static void main(String[] args) throws ClassNotFoundException {
		 try {
			String  sql = "select * from test1";
			Connection con = JDBCUtils.getConnection();
			Statement statement =  con.createStatement();
			ResultSet rs = statement.executeQuery(sql);
			while(rs.next()) {
				String  name = rs.getString(2);
				System.out.println(name);
			}
			JDBCUtils.release(con, statement, rs);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}