hive连接心得

<property>
    <name>javax.jdo.option.ConnectionUserName</name>
    <value>root</value><!--mysql的user-->
    <description>Username to use against metastore database</description>
  </property>
<property>
    <name>javax.jdo.option.ConnectionPassword</name>
    <value>mypassword</value><!--mysql的password-->
    <description>password to use against metastore database</description>
 </property>
 <property>
    <name>javax.jdo.option.ConnectionDriverName</name>
    <value>com.mysql.jdbc.Driver</value><!--jdbc驱动-->
    <description>Driver class name for a JDBC metastore</description>
  </property>
<property>
    <name>javax.jdo.option.ConnectionURL</name>
    <value>jdbc:mysql://192.168.25.66:3306/hive?characterEncoding=UTF-8&amp;createDatabaseIfNotExist=true&amp;useSSL=false</value>
    <description>
      JDBC connect string for a JDBC metastore.
      To use SSL to encrypt/authenticate the connection, provide database-specific SSL flag in the connection URL.
      For example, jdbc:postgresql://myhost/db?ssl=true for postgres database.
    </description>
</property>

<property>
        <!--表示任意节点使用hadoop集群用户root都能访问hdfs-->
      <name>hadoop.proxyuser.root.hosts</name>
      <value>*</value>
  </property>
  <property>
      <name>hadoop.proxyuser.root.groups</name>
      <value>*</value>
  </property>

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


public class APP {
    private static String driverName = "org.apache.hive.jdbc.HiveDriver";
    public static void main( String[] args )
    {
        try {
            Class.forName(driverName);
            Connection con = null;
            con = DriverManager.getConnection("jdbc:hive2://myhost:10000/hive0331", "root", "");
            Statement stmt = con.createStatement();
            ResultSet res = null;
            String sql = "select * from users";
            System.out.println("Running: " + sql);
            res = stmt.executeQuery(sql);
            System.out.println("ok");
            while (res.next()) {
                System.out.println(res.getString(1) + "\t" + res.getString(2) + "\t" +  res.getString(3) );
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("error");
        }
    }

}