hive按当天日期建立分区表 | 动态往日期分区插入数据

hive建立分区表，以当天日期（“2014-08-15”）作为分区依据，hql如下：

CREATE EXTERNAL TABLE IF NOT EXISTS product_sell(
category_id BIGINT,
province_id BIGINT,
product_id BIGINT,
price DOUBLE,
sell_num BIGINT
)
PARTITIONED BY (ds string)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY '\t'
LINES TERMINATED BY '\n'
STORED AS TEXTFILE;

然后以日期作为分区依据，插入数据，shell脚本如下：

#!/bin/bash
source /etc/profile;

today=$(date +%Y-%m-%d)
/usr/local/cloud/hive/bin/hive<<EOF 
INSERT OVERWRITE TABLE product_sell PARTITION (ds='$today') select a.category_id, b.good_receiver_province_id as province_id, a.id as product_id, (b.sell_amount/b.sell_num) as price, b.sell_num from product a join (select si.product_id, s.good_receiver_province_id, sum(si.order_item_amount) sell_amount, sum(si.order_item_num) sell_num from so_item si join so s on (si.order_id=s.id) where si.is_gift=0 and datediff(date_sub(from_unixtime(unix_timestamp()),1), si.ds) between 0 and 6 group by s.good_receiver_province_id, si.product_id) b on (a.id=b.product_id);
EOF

这个部分难点在于hive中不知道如何调用形如shell日期变量的方式创建日期分区，mark一下！

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