Hive-day09 HiveJDBC

Hive JDBC

启动hiveserver2

在使用Hive JDBC之前必须先启动客服端服务，这样用其他节点，或者idea就可以连接hive数据库，命令为：

hive --service hiveserver2 &
或者
hiveserver2 &

新建maven项目并添加两个依赖

    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-common</artifactId>
        <version>2.7.6</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.apache.hive/hive-jdbc -->
    <dependency>
        <groupId>org.apache.hive</groupId>
        <artifactId>hive-jdbc</artifactId>
        <version>1.2.1</version>
    </dependency>

编写JDBC代码

import java.sql.*;

public class HiveJDBC {
    public static void main(String[] args) throws ClassNotFoundException, sqlException {
        Class.forName("org.apache.hive.jdbc.HiveDriver");
        Connection conn = DriverManager.getConnection("jdbc:hive2://master:10000/bigdata17");
        Statement stat = conn.createStatement();
        ResultSet rs = stat.executeQuery("select * from students limit 10");
        while (rs.next()) {
            int id = rs.getInt(1);
            String name = rs.getString(2);
            int age = rs.getInt(3);
            String gender = rs.getString(4);
            String clazz = rs.getString(5);
            System.out.println(id + "," + name + "," + age + "," + gender + "," + clazz);
        }
        rs.close();
        stat.close();
        conn.close();
    }
}