大数据学习之hive的jdbc测试类编写

JDBC编写步骤

JDBCTest.java
import java.sql.*;    
public class JdbcTest {
public static void main(String[] args) throws SQLException {
    try {

1.加载驱动 （这里连接的是hive：org.apache.hive.jdbc.HiveDriver）

        Class.forName("org.apache.hive.jdbc.HiveDriver");
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
        System.exit(1);
    }

2.建立连接 （与数据建立链接：“jdbc:hive2://192.168.230.131:10000/test”,“root”,“root”）

    //通信端口 ：50070 9000 50090 8080 8088 3306 22 2181 2888/3888 10000
    Connection con = DriverManager.getConnection("jdbc:hive2://192.168.230.131:10000/test","root","root");

3.引入接口

Statement sta = con.createStatement();

4.编写hql语句（类似于sql）用接口封装的excute 和 executeQuery方法分别进行添加和查询操作

    String tableName = "jdbcTest2";
    sta.execute("drop table if exists"+tableName);
    sta.execute("CREATE table "+tableName+"(key int,value String)");
    System.out.println("Create table success!");

    //show tables
    String sql = "show tables '"+tableName+"'";
    System.out.println("Running: "+sql);
    ResultSet res = sta.executeQuery(sql);
    if(res.next()){
        System.out.println(res.getString(1));
    }

    //describe table
    sql = "describe "+tableName;
    System.out.println("Running: "+sql);
    res = sta.executeQuery(sql);
    while(res.next()){
        System.out.println(res.getString(1)+"\t"+res.getString(2));
    }

    sql ="select * from "+tableName;
    res = sta.executeQuery(sql);
    while(res.next()){
        System.out.println(String.valueOf(res.getInt(1)+"\t"+res.getString(2)));
    }

    sql = "select count(1) from "+tableName;
    System.out.println("Running: "+sql);
    res = sta.executeQuery(sql);
    while(res.next()){
        System.out.println(res.getString(1));
    }
    }
}