Hive和Jdbc示例

重要：在使用 JDBC 开发 Hive 程序时, 必须首先开启 Hive 的远程服务接口。使用下面命令进行开启:hive -service hiveserver &

1). 测试数据
userinfo.txt文件内容(每行数据之间用tab键隔开):

1   xiapi2    xiaoxue3    qingqing

2). 程序代码

 1 packagecom.ljq.hive;import java.sql.Connection;

 2 import java.sql.DriverManager;import java.sql.ResultSet;

 3 import java.sql.SQLException;import java.sql.Statement;

 4 import org.apache.log4j.Logger;

 5 public class HiveJdbcClient {        

 6 private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";        

 7 private staticString url = "jdbc:hive://192.168.11.157:10000/default";        

 8 private staticString user = "hive";        

 9 private static String password = "mysql";        

10 private staticString sql = "";        

11 private static ResultSet res;        

12 private static finalLogger log = Logger.getLogger(HiveJdbcClient.class);        

13 public static voidmain(String[] args) {                

14 try {

15             Class.forName(driverName);

16             Connection conn = DriverManager.getConnection(url,user, password);

17              Statement stmt =conn.createStatement();

18  // 创建的表名

19              String tableName ="testHiveDriverTable";

20  /** 第一步:存在就先删除 **/

21              sql = "drop table" + tableName;

22              stmt.executeQuery(sql);                       

23  /** 第二步:不存在就创建 **/

24              sql = "createtable " + tableName + " (key int, value string)  row format delimited fields terminated by'\t'";

25              stmt.executeQuery(sql);                        

26 // 执行“show tables”操作

27              sql = "show tables'" + tableName + "'";

28              System.out.println("Running:" + sql);

29              res =stmt.executeQuery(sql);

30              System.out.println("执行“showtables”运行结果:");                       

31              if (res.next()) {

32                  System.out.println(res.getString(1));

33              }                        

34 // 执行“describe table”操作

35              sql = "describe" + tableName;

36              System.out.println("Running:" + sql);

37              res =stmt.executeQuery(sql);

38              System.out.println("执行“describetable”运行结果:");                        

39             while (res.next()) {  

40                   System.out.println(res.getString(1) + "\t" +res.getString(2));

41             }                        

42 // 执行“load data into table”操作

43             String filepath ="/home/hadoop/ziliao/userinfo.txt";

44             sql = "load datalocal inpath '" + filepath + "' into table " + tableName;

45             System.out.println("Running:" + sql);

46             res =stmt.executeQuery(sql);                       

47             // 执行“select * query”操作

48            sql = "select *from " + tableName;

49            System.out.println("Running:" + sql);

50            res = stmt.executeQuery(sql);

51            System.out.println("执行“select* query”运行结果:");    

52            while (res.next()) {

53                System.out.println(res.getInt(1) + "\t" + res.getString(2));

54             }

55  // 执行“regular hive query”操作

56            sql = "selectcount(1) from " + tableName;

57            System.out.println("Running:" + sql);

58            res =stmt.executeQuery(sql);

59            System.out.println("执行“regularhive query”运行结果:");    

60            while (res.next()) {

61                  System.out.println(res.getString(1));

62            }

63            conn.close();

64            conn = null;

65            } catch (ClassNotFoundException e) {

66                 e.printStackTrace();

67                 log.error(driverName +" not found!", e);

68                 System.exit(1);

69            } catch (SQLException e) {

70                 e.printStackTrace();

71                 log.error("Connection error!", e);

72                 System.exit(1);

73             }

74        }

75 }                        

View Code

3). 运行结果 ( 右击 -->Run as-->Run on Hadoop)

Running:show tables'testHiveDriverTable'执行“show tables”运行结果:

testhivedrivertable

Running:describe testHiveDriverTable

执行“describe table”运行结果:

key   intvalue    string

Running:load data local inpath'/home/hadoop/ziliao/userinfo.txt' into table testHiveDriverTable

Running:select * fromtestHiveDriverTable

执行“select * query”运行结果:1    xiapi2    xiaoxue3   qingqing

Running:select count(1) fromtestHiveDriverTable

执行“regular hive query”运行结果:3