hive教程1（groovy jdbc连接hive）

1. 在idea上创建好maven项目，pom.xml这样配置

   <?xml version="1.0" encoding="UTF-8"?>
   <project xmlns="http://maven.apache.org/POM/4.0.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
   <modelVersion>4.0.0</modelVersion>
   
   <groupId>hive</groupId>
   <artifactId>hive</artifactId>
   <packaging>pom</packaging>
   <version>1.0-SNAPSHOT</version>
   
   <dependencies>
       <dependency>
           <groupId>org.apache.hadoop</groupId>
           <artifactId>hadoop-common</artifactId>
           <version>2.6.5</version>
       </dependency>
       <dependency>
           <groupId>org.apache.hive</groupId>
           <artifactId>hive-jdbc</artifactId>
           <version>1.1.0</version>
       </dependency>
       <dependency>
           <groupId>org.codehaus.groovy</groupId>
           <artifactId>groovy-all</artifactId>
           <version>2.4.12</version>
       </dependency>
   </dependencies>
   </project>

2. 新建一个groovy文件如下

   import groovy.sql.Sql
   import groovy.transform.CompileStatic
   
   @CompileStatic
   class TestHiveJdbc {
       static void main(String[] args) {
           String url = "jdbc:hive2://t2:10000/default"
           String user = "root"
           String password = ""
           String driverClassName = "org.apache.hive.jdbc.HiveDriver"
   
           Sql hiveJdbc = Sql.newInstance(url, user, password, driverClassName)
           hiveJdbc.eachRow("show tables", {
               println it
           })
       }
   }

3. 运行代码，得到如下结果
   

4. 上面的代码运行某些sql会报错，比如return code 1 from org.apache.hadoop.hive.ql.exec等等，是因为权限不够，解决方法：

   String user = "hive"
   String password = "hive"