林子雨编著《大数据基础编程、实验和案例教程》教材第8章的代码

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第8章 数据仓库Hive的安装和使用

教材第157页

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sudo tar -zxvf ./apache-hive-1.2.1-bin.tar.gz -C /usr/local   # 解压到/usr/local中
cd /usr/local/
sudo mv apache-hive-1.2.1-bin hive       # 将文件夹名改为hive
sudo chown -R hadoop:hadoop hive          # 修改文件权限

教材第158页

vim ~/.bashrc

export HIVE_HOME=/usr/local/hive
export PATH=$PATH:$HIVE_HOME/bin

source ~/.bashrc

cd /usr/local/hive/conf
sudo mv hive-default.xml.template hive-default.xml

cd /usr/local/hive/conf
vim hive-site.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
  <property>
    <name>javax.jdo.option.ConnectionURL</name>
    <value>jdbc:mysql://localhost:3306/hive?createDatabaseIfNotExist=true</value>
    <description>JDBC connect string for a JDBC metastore</description>
  </property>
  <property>
    <name>javax.jdo.option.ConnectionDriverName</name>
    <value>com.mysql.jdbc.Driver</value>
    <description>Driver class name for a JDBC metastore</description>
  </property>
  <property>
    <name>javax.jdo.option.ConnectionUserName</name>
    <value>hive</value>
    <description>username to use against metastore database</description>
  </property>
  <property>
    <name>javax.jdo.option.ConnectionPassword</name>
    <value>hive</value>
    <description>password to use against metastore database</description>
  </property>
</configuration>

教材第159页

cd ~
tar -zxvf mysql-connector-java-5.1.40.tar.gz   #解压
#下面将mysql-connector-java-5.1.40-bin.jar拷贝到/usr/local/hive/lib目录下
cp mysql-connector-java-5.1.40/mysql-connector-java-5.1.40-bin.jar  /usr/local/hive/lib

教材第160页

service mysql start  #启动MySQL服务
mysql -u root -p   #登录MySQL数据库

mysql> create database hive; 

mysql> grant all on *.* to hive@localhost identified by 'hive'; 
mysql> flush privileges; 

cd /usr/local/hadoop
./sbin/start-dfs.sh

cd /usr/local/hive
./bin/hive

hive

教材第161页

schematool -dbType mysql -initSchema

教材第162页

hive> create database hive;

hive> create database if not exists hive;

hive> use hive;
hive>create table if not exists usr(id bigint,name string,age int);

hive>create table if not exists hive.usr(id bigint,name string,age int)
            >location ‘/usr/local/hive/warehouse/hive/usr’;

hive>create external table if not exists hive.usr(id bigint,name string,age int)
            >row format delimited fields terminated by ','
            >location ‘/usr/local/data’;

教材第163页

hive>create table hive.usr(id bigint,name string,age int) partition by(sex boolean);

hive> use hive;
hive> create table if not exists usr1 like usr;

hive>create view little_usr as select id,age from usr;

hive> drop database hive;

hive>drop database if exists hive;

hive> drop database if exists hive cascade;

hive> drop table if exists usr;

hive> drop view if exists little_usr;

教材第164页

hive> alter database hive set dbproperties(‘edited-by’=’lily’);

hive> alter table usr rename to user;

hive> alter table usr add if not exists partition(age=10);
hive> alter table usr add if not exists partition(age=20);

hive> alter table usr drop if exists partition(age=10);

hive>alter table usr change name username string after age;

hive>alter table usr add columns(sex boolean);

hive>alter table usr replace columns(newid bigint,newname string,newage int);

hive> alter table usr set tblproperties(‘notes’=’the columns in usr may be null except id’);

教材第165页

hive> alter view little_usr set tblproperties(‘create_at’=’refer to timestamp’);

hive> show databases;

hive>show databases like ‘h.*’;

hive> use hive;
hive> show tables;

hive> show tables in hive like ‘u.*’;

hive> describe database hive;

hive>describe database extended hive;

hive> describe hive.usr;
hive> describe hive.little_usr;

教材第166页

hive> describe extended hive.usr;
hive> describe extended hive.little_usr;

hive> describe extended hive.usr.id;

hive> load data local inpath ‘/usr/local/data’ overwrite into table usr;

hive> load data local inpath ‘/usr/local/data’ into table usr;

hive> load data inpath ‘hdfs://master_server/usr/local/data’ overwrite into table usr;

hive> insert overwrite table usr1
             > select * from usr where age=10;

hive> insert into table usr1
   > select * from usr where age=10;

教材第167页

cd /usr/local/hadoop
mkdir input

cd  /usr/local/hadoop/input
echo "hello world" > file1.txt
echo "hello hadoop" > file2.txt

hive

hive> create table docs(line string);
hive> load data inpath 'input' overwrite into table docs;
hive>create table word_count as
            >select word, count(1) as count from
            >(select explode(split(line,' '))as word from docs) w
            >group by word
            >order by word;