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

 packagecom.ljq.hive;import java.sql.Connection;
 import java.sql.DriverManager;import java.sql.ResultSet;
 import java.sql.SQLException;import java.sql.Statement;
 import org.apache.log4j.Logger;
 public class HiveJdbcClient {
 private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";
 private staticString url = "jdbc:hive://192.168.11.157:10000/default";
 private staticString user = "hive";
 private static String password = "mysql";
 private staticString sql = "";
 private static ResultSet res;
 private static finalLogger log = Logger.getLogger(HiveJdbcClient.class);
 public static voidmain(String[] args) {
 try {
             Class.forName(driverName);
             Connection conn = DriverManager.getConnection(url,user, password);
              Statement stmt =conn.createStatement();
  // 创建的表名
              String tableName ="testHiveDriverTable";
  /** 第一步:存在就先删除 **/
              sql = "drop table" + tableName;
              stmt.executeQuery(sql);
  /** 第二步:不存在就创建 **/
              sql = "createtable " + tableName + " (key int, value string)  row format delimited fields terminated by'\t'";
              stmt.executeQuery(sql);
 // 执行“show tables”操作
              sql = "show tables'" + tableName + "'";
              System.out.println("Running:" + sql);
              res =stmt.executeQuery(sql);
              System.out.println("执行“showtables”运行结果:");
              if (res.next()) {
                  System.out.println(res.getString(1));
              }
 // 执行“describe table”操作
              sql = "describe" + tableName;
              System.out.println("Running:" + sql);
              res =stmt.executeQuery(sql);
              System.out.println("执行“describetable”运行结果:");
             while (res.next()) {
                   System.out.println(res.getString(1) + "\t" +res.getString(2));
             }
 // 执行“load data into table”操作
             String filepath ="/home/hadoop/ziliao/userinfo.txt";
             sql = "load datalocal inpath '" + filepath + "' into table " + tableName;
             System.out.println("Running:" + sql);
             res =stmt.executeQuery(sql);
             // 执行“select * query”操作
            sql = "select *from " + tableName;
            System.out.println("Running:" + sql);
            res = stmt.executeQuery(sql);
            System.out.println("执行“select* query”运行结果:");
            while (res.next()) {
                System.out.println(res.getInt(1) + "\t" + res.getString(2));
             }
  // 执行“regular hive query”操作
            sql = "selectcount(1) from " + tableName;
            System.out.println("Running:" + sql);
            res =stmt.executeQuery(sql);
            System.out.println("执行“regularhive query”运行结果:");
            while (res.next()) {
                  System.out.println(res.getString(1));
            }
            conn.close();
            conn = null;
            } catch (ClassNotFoundException e) {
                 e.printStackTrace();
                 log.error(driverName +" not found!", e);
                 System.exit(1);
            } catch (SQLException e) {
                 e.printStackTrace();
                 log.error("Connection error!", e);
                 System.exit(1);
             }
        }
 }                        

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