Hive：JDBC示例
1)本地目录/home/hadoop/test下的test4.txt文件内容(每行数据之间用tab键隔开)如下所示:
[hadoop@master test]$ sudo vim test4.txt
dajiangtai
hadoop
hive
hbase
spark
2)启动hiveserver2
[hadoop@master test]$ cd ${HIVE_HOME}/bin
[hadoop@master bin]$ ll
total
-rwxr-xr-x hadoop hadoop Jan beeline
drwxr-xr-x hadoop hadoop May : ext
-rwxr-xr-x hadoop hadoop Jan hive
-rwxr-xr-x hadoop hadoop Jan hive-config.sh
-rwxr-xr-x hadoop hadoop Jan hiveserver2
-rwxr-xr-x hadoop hadoop Jan metatool
-rwxr-xr-x hadoop hadoop Jan schematool
[hadoop@master bin]$ ./hiveserver2
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/opt/modules/hadoop-2.6./share/hadoop/common/lib/slf4j-log4j12-1.7..jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/opt/modules/hive1.0.0/lib/hive-jdbc-1.0.-standalone.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
3) 程序代码
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Hive {
private static String driverName = "org.apache.hive.jdbc.HiveDriver";//hive驱动名称
private static String url = "jdbc:hive2://master:10000/default";//连接hive2服务的连接地址，Hive0.11.0以上版本提供了一个全新的服务：HiveServer2
private static String user = "hadoop";//对HDFS有操作权限的用户
private static String password = "";//在非安全模式下，指定一个用户运行查询，忽略密码
private static String sql = "";
private static ResultSet res;
public static void main(String[] args) {
try {
Class.forName(driverName);//加载HiveServer2驱动程序
Connection conn = DriverManager.getConnection(url, user, password);//根据URL连接指定的数据库
Statement stmt = conn.createStatement(); //创建的表名
String tableName = "testHiveDriverTable"; /** 第一步:表存在就先删除 **/
sql = "drop table " + tableName;
stmt.execute(sql); /** 第二步:表不存在就创建 **/
sql = "create table " + tableName + " (key int, value string) row format delimited fields terminated by '\t' STORED AS TEXTFILE";
stmt.execute(sql); // 执行“show tables”操作
sql = "show tables '" + tableName + "'";
res = stmt.executeQuery(sql);
if (res.next()) {
System.out.println(res.getString());
} // 执行“describe table”操作
sql = "describe " + tableName;
res = stmt.executeQuery(sql);
while (res.next()) {
System.out.println(res.getString() + "\t" + res.getString());
} // 执行“load data into table”操作
String filepath = "/home/hadoop/test/test4.txt";//hive服务所在节点的本地文件路径
sql = "load data local inpath '" + filepath + "' into table " + tableName;
stmt.execute(sql); // 执行“select * query”操作
sql = "select * from " + tableName;
res = stmt.executeQuery(sql);
while (res.next()) {
System.out.println(res.getInt() + "\t" + res.getString());
} // 执行“regular hive query”操作，此查询会转换为MapReduce程序来处理
sql = "select count(*) from " + tableName;
res = stmt.executeQuery(sql);
while (res.next()) {
System.out.println(res.getString());
}
conn.close();
conn = null;
} catch (ClassNotFoundException e) {
e.printStackTrace();
System.exit();
} catch (SQLException e) {
e.printStackTrace();
System.exit();
}
}
}
4) 运行结果(右击-->Run as-->Run on Hadoop)
此时直接运行会报错，解决方案请见下一篇博文：HiveSQLException: Error while compiling statement: No privilege 'Create' found for outputs { database:default }。
运行日志如下：
-- ::, INFO [org.apache.hive.jdbc.Utils] - Supplied authorities: master:
-- ::, INFO [org.apache.hive.jdbc.Utils] - Resolved authority: master:
-- ::, INFO [org.apache.hive.jdbc.HiveConnection] - Will try to open client transport with JDBC Uri: jdbc:hive2://master:10000/default
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - opening transport org.apache.thrift.transport.TSaslClientTransport@3834d63f
-- ::, DEBUG [org.apache.thrift.transport.TSaslClientTransport] - Sending mechanism name PLAIN and initial response of length
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: Writing message with status START and payload length
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: Writing message with status COMPLETE and payload length
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: Start message handled
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: Main negotiation loop complete
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: SASL Client receiving last message
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: Received message with status COMPLETE and payload length
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.hive.jdbc.HiveQueryResultSet] - Fetched row string:
testhivedrivertable
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.hive.jdbc.HiveQueryResultSet] - Fetched row string:
key int
-- ::, DEBUG [org.apache.hive.jdbc.HiveQueryResultSet] - Fetched row string:
value string
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.hive.jdbc.HiveQueryResultSet] - Fetched row string:
1 dajiangtai
-- ::, DEBUG [org.apache.hive.jdbc.HiveQueryResultSet] - Fetched row string:
2 hadoop
-- ::, DEBUG [org.apache.hive.jdbc.HiveQueryResultSet] - Fetched row string:
3 hive
-- ::, DEBUG [org.apache.hive.jdbc.HiveQueryResultSet] - Fetched row string:
4 hbase
-- ::, DEBUG [org.apache.hive.jdbc.HiveQueryResultSet] - Fetched row string:
5 spark
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.hive.jdbc.HiveQueryResultSet] - Fetched row string: -- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - writing data length:
-- ::, DEBUG [org.apache.thrift.transport.TSaslTransport] - CLIENT: reading data length:
执行“show tables”运行结果:
testhivedrivertable
执行“describe table”运行结果:
key int
value string
执行“select * query”运行结果:
dajiangtai
hadoop
hive
hbase
spark
或者从集群上查看运行结果。
hive> show tables;
OK
copy_student1
copy_student2
copy_student3
copy_student4
employee
group_gender_agg
group_gender_sum
group_test
index_test
index_tmp
partition_test
student1
student2
test
test_view
testhivedrivertable
user
Time taken: 0.153 seconds, Fetched: row(s)
hive> desc testhivedrivertable;
OK
key int
value string
Time taken: 0.184 seconds, Fetched: row(s)
hive> select * from testhivedrivertable;
OK
1 dajiangtai
2 hadoop
3 hive
4 hbase
5 spark
Time taken: 0.346 seconds, Fetched: row(s)
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