Hive进阶_Hive的客户端操作

启动远程客户端 # hive --service hiveserver2
获取连接-〉创建运行环境-〉执行HQL-〉处理结果-〉释放资源

工具类

 package demo.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 driverString = "org.apache.hive.jdbc.HiveDriver";
     private static String urlString = "jdbc:hive2://sd-9c1f-2eac:10000/default";
     static {
         try {
             Class.forName(driverString);
         } catch (ClassNotFoundException e) {
             throw new ExceptionInInitializerError(e);
         }
     }

     public static Connection getConnection() {
         try {
             return DriverManager.getConnection(urlString);
         } catch (SQLException e) {
             e.printStackTrace();
         }
         return null;
     }

     public static void release (Connection conn, Statement st, ResultSet rs){
         if (rs!=null){
             try{
                 rs.close();
             }catch(SQLException e){
                 e.printStackTrace();
             }finally{
                 rs=null;
             }
         }
         if (st!=null){
             try{
                 st.close();
             }catch(SQLException e){
                 e.printStackTrace();
             }finally{
                 st=null;
             }
         }
         if (conn!=null){
             try{
                 conn.close();
             }catch(SQLException e){
                 e.printStackTrace();
             }finally{
                 conn=null;
             }
         }
     }

 }

JDBCUtil.java

测试类

 package demo.hive;

 import java.sql.Connection;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.sql.Statement;

 import demo.utils.JDBCUtils;

 public class HiveJDBCDemo {
     public static void main(String[] args) {
         Connection conn=null;
         Statement st=null;
         ResultSet rs=null;
         String sql="select * from sampledata";
         conn=JDBCUtils.getConnection();
         try {
             st=conn.createStatement();
             rs = st.executeQuery(sql);
             while(rs.next()){
                 String sid = rs.getString(1);
                 String sname = rs.getString(2);
                 String gender = rs.getString(3);
                 System.out.println(sid+" "+sname+" "+gender);
             }
         } catch (SQLException e) {
             e.printStackTrace();
         }finally{
             JDBCUtils.release(conn, st, rs);
         }

     }

 }

HiveJDBCDemo.java

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Users/PL62716/workspace/HiveDemo/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Users/PL62716/workspace/HiveDemo/lib/slf4j-log4j12-1.7.22.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.apache.logging.slf4j.Log4jLoggerFactory]
ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console.
1 Tom  M
2 Mary F
3 Jerry M
4 Rose M
5 Mike F

add hive/lib->all jar and hadoop->share->hadoop->common->hadoop-common.jar to project build path.