离线数仓数据导出-hive数据同步到mysql

MySQL建库建表
数据导出

为方便报表应用使用数据，需将ads各指标的统计结果导出到MySQL数据库中。
datax支持hive同步MySQL：仅仅支持hive存储的hdfs文件导出。所以reader选hdfs-reader，writer选mysql-writer。

在这里插入图片描述
null值在hive和mysql里的存储格式不一样，需要告诉DataX应该如何转换。

MySQL建库建表

12.1.1 创建数据库

CREATE DATABASE IF NOT EXISTS gmall_report DEFAULT CHARSET utf8 COLLATE utf8_general_ci;

建mysql表的，
1字段个数要和hive中的ads层数据保持一致，
2字段类型要和hive对等替换，
3字段顺序也要一致
每张表要有主键

1）各活动补贴率
dt activity_id activity_name 三个主键联合而成

DROP TABLE IF EXISTS `ads_activity_stats`;
CREATE TABLE `ads_activity_stats`  (
  `dt` date NOT NULL COMMENT '统计日期',
  `activity_id` varchar(16) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '活动ID',
  `activity_name` varchar(64) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '活动名称',
  `start_date` varchar(16) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '活动开始日期',
  `reduce_rate` decimal(16, 2) NULL DEFAULT NULL COMMENT '补贴率',
  PRIMARY KEY (`dt`, `activity_id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '活动统计' ROW_FORMAT = Dynamic;

数据导出

DataX配置文件生成脚本
方便起见，此处提供了DataX配置文件批量生成脚本，脚本内容及使用方式如下。
1）在~/bin目录下创建gen_export_config.py脚本
[atguigu@hadoop102 bin]$ vim ~/bin/gen_export_config.py
脚本内容如下

# coding=utf-8
import json
import getopt
import os
import sys
import MySQLdb

#MySQL相关配置，需根据实际情况作出修改
mysql_host = "hadoop102"
mysql_port = "3306"
mysql_user = "root"
mysql_passwd = "000000"

#HDFS NameNode相关配置，需根据实际情况作出修改
hdfs_nn_host = "hadoop102"
hdfs_nn_port = "8020"

#生成配置文件的目标路径，可根据实际情况作出修改
output_path = "/opt/module/datax/job/export"


def get_connection():
    return MySQLdb.connect(host=mysql_host, port=int(mysql_port), user=mysql_user, passwd=mysql_passwd)


def get_mysql_meta(database, table):
    connection = get_connection()
    cursor = connection.cursor()
    sql = "SELECT COLUMN_NAME,DATA_TYPE from information_schema.COLUMNS WHERE TABLE_SCHEMA=%s AND TABLE_NAME=%s ORDER BY ORDINAL_POSITION"
    cursor.execute(sql, [database, table])
    fetchall = cursor.fetchall()
    cursor.close()
    connection.close()
    return fetchall


def get_mysql_columns(database, table):
    return map(lambda x: x[0], get_mysql_meta(database, table))


def generate_json(target_database, target_table):
    job = {
        "job": {
            "setting": {
                "speed": {
                    "channel": 3
                },
                "errorLimit": {
                    "record": 0,
                    "percentage": 0.02
                }
            },
            "content": [{
                "reader": {
                    "name": "hdfsreader",
                    "parameter": {
                        "path": "${exportdir}",
                        "defaultFS": "hdfs://" + hdfs_nn_host + ":" + hdfs_nn_port,
                        "column": ["*"],
                        "fileType": "text",
                        "encoding": "UTF-8",
                        "fieldDelimiter": "\t",
                        "nullFormat": "\\N"
                    }
                },
                "writer": {
                    "name": "mysqlwriter",
                    "parameter": {
                        "writeMode": "replace",
                        "username": mysql_user,
                        "password": mysql_passwd,
                        "column": get_mysql_columns(target_database, target_table),
                        "connection": [
                            {
                                "jdbcUrl":
                                    "jdbc:mysql://" + mysql_host + ":" + mysql_port + "/" + target_database + "?useUnicode=true&characterEncoding=utf-8",
                                "table": [target_table]
                            }
                        ]
                    }
                }
            }]
        }
    }
    if not os.path.exists(output_path):
        os.makedirs(output_path)
    with open(os.path.join(output_path, ".".join([target_database, target_table, "json"])), "w") as f:
        json.dump(job, f)


def main(args):
    target_database = ""
    target_table = ""

    options, arguments = getopt.getopt(args, '-d:-t:', ['targetdb=', 'targettbl='])
    for opt_name, opt_value in options:
        if opt_name in ('-d', '--targetdb'):
            target_database = opt_value
        if opt_name in ('-t', '--targettbl'):
            target_table = opt_value

    generate_json(target_database, target_table)

if __name__ == '__main__':
    main(sys.argv[1:])

在~/bin目录下创建gen_export_config.sh脚本
[atguigu@hadoop102 bin]$ vim ~/bin/gen_export_config.sh
脚本内容如下。

#!/bin/bash

python ~/bin/gen_export_config.py -d gmall_report -t ads_activity_stats
python ~/bin/gen_export_config.py -d gmall_report -t ads_coupon_stats
python ~/bin/gen_export_config.py -d gmall_report -t ads_new_buyer_stats
python ~/bin/gen_export_config.py -d gmall_report -t ads_order_by_province
python ~/bin/gen_export_config.py -d gmall_report -t ads_page_path
python ~/bin/gen_export_config.py -d gmall_report -t ads_repeat_purchase_by_tm
python ~/bin/gen_export_config.py -d gmall_report -t ads_sku_cart_num_top3_by_cate
python ~/bin/gen_export_config.py -d gmall_report -t ads_trade_stats
python ~/bin/gen_export_config.py -d gmall_report -t ads_trade_stats_by_cate
python ~/bin/gen_export_config.py -d gmall_report -t ads_trade_stats_by_tm
python ~/bin/gen_export_config.py -d gmall_report -t ads_traffic_stats_by_channel
python ~/bin/gen_export_config.py -d gmall_report -t ads_user_action
python ~/bin/gen_export_config.py -d gmall_report -t ads_user_change
python ~/bin/gen_export_config.py -d gmall_report -t ads_user_retention
python ~/bin/gen_export_config.py -d gmall_report -t ads_user_stats

3）为gen_export_config.sh脚本增加执行权限
[atguigu@hadoop102 bin]$ chmod +x ~/bin/gen_export_config.sh
4）执行gen_export_config.sh脚本，生成配置文件
[atguigu@hadoop102 bin]$ gen_export_config.sh
5）观察生成的配置文件

[atguigu@hadoop102 bin]$ ls /opt/module/datax/job/export/

编写每日导出脚本
（1）在hadoop102的/home/atguigu/bin目录下创建hdfs_to_mysql.sh
[atguigu@hadoop102 bin]$ vim hdfs_to_mysql.sh
（2）编写如下内容


#! /bin/bash

DATAX_HOME=/opt/module/datax

#DataX导出路径不允许存在空文件，该函数作用为清理空文件
handle_export_path(){
  target_file=$1
  for i in `hadoop fs -ls -R $target_file | awk '{print $8}'`; do
    hadoop fs -test -z $i
    if [[ $? -eq 0 ]]; then
      echo "$i文件大小为0，正在删除"
      hadoop fs -rm -r -f $i
    fi
  done

}


#数据导出
export_data() {
  datax_config=$1
  export_dir=$2
  hadoop fs -test -e $export_dir
  if [[ $? -eq 0 ]]
  then
    handle_export_path $export_dir
    file_count=$(hadoop fs -ls $export_dir | wc -l)
    if [ $file_count -gt 0 ]
    then
      set -e;
      $DATAX_HOME/bin/datax.py -p"-Dexportdir=$export_dir" $datax_config
      set +e;
    else 
      echo "$export_dir 目录为空，跳过~"
    fi
  else
    echo "路径 $export_dir 不存在，跳过~"
  fi
}


case $1 in
  "ads_new_buyer_stats")
    export_data /opt/module/datax/job/export/gmall_report.ads_new_buyer_stats.json /warehouse/gmall/ads/ads_new_buyer_stats
  ;;
  "ads_order_by_province")
    export_data /opt/module/datax/job/export/gmall_report.ads_order_by_province.json /warehouse/gmall/ads/ads_order_by_province
  ;;
  "ads_page_path")
    export_data /opt/module/datax/job/export/gmall_report.ads_page_path.json /warehouse/gmall/ads/ads_page_path
  ;;
  "ads_repeat_purchase_by_tm")
    export_data /opt/module/datax/job/export/gmall_report.ads_repeat_purchase_by_tm.json /warehouse/gmall/ads/ads_repeat_purchase_by_tm
  ;;
  "ads_trade_stats")
    export_data /opt/module/datax/job/export/gmall_report.ads_trade_stats.json /warehouse/gmall/ads/ads_trade_stats
  ;;
  "ads_trade_stats_by_cate")
    export_data /opt/module/datax/job/export/gmall_report.ads_trade_stats_by_cate.json /warehouse/gmall/ads/ads_trade_stats_by_cate
  ;;
  "ads_trade_stats_by_tm")
    export_data /opt/module/datax/job/export/gmall_report.ads_trade_stats_by_tm.json /warehouse/gmall/ads/ads_trade_stats_by_tm
  ;;
  "ads_traffic_stats_by_channel")
    export_data /opt/module/datax/job/export/gmall_report.ads_traffic_stats_by_channel.json /warehouse/gmall/ads/ads_traffic_stats_by_channel
  ;;
  "ads_user_action")
    export_data /opt/module/datax/job/export/gmall_report.ads_user_action.json /warehouse/gmall/ads/ads_user_action
  ;;
  "ads_user_change")
    export_data /opt/module/datax/job/export/gmall_report.ads_user_change.json /warehouse/gmall/ads/ads_user_change
  ;;
  "ads_user_retention")
    export_data /opt/module/datax/job/export/gmall_report.ads_user_retention.json /warehouse/gmall/ads/ads_user_retention
  ;;
  "ads_user_stats")
    export_data /opt/module/datax/job/export/gmall_report.ads_user_stats.json /warehouse/gmall/ads/ads_user_stats
  ;;
  "ads_activity_stats")
    export_data /opt/module/datax/job/export/gmall_report.ads_activity_stats.json /warehouse/gmall/ads/ads_activity_stats
  ;;
  "ads_coupon_stats")
    export_data /opt/module/datax/job/export/gmall_report.ads_coupon_stats.json /warehouse/gmall/ads/ads_coupon_stats
  ;;
  "ads_sku_cart_num_top3_by_cate")
    export_data /opt/module/datax/job/export/gmall_report.ads_sku_cart_num_top3_by_cate.json /warehouse/gmall/ads/ads_sku_cart_num_top3_by_cate
  ;;

"all")
  export_data /opt/module/datax/job/export/gmall_report.ads_new_buyer_stats.json /warehouse/gmall/ads/ads_new_buyer_stats
  export_data /opt/module/datax/job/export/gmall_report.ads_order_by_province.json /warehouse/gmall/ads/ads_order_by_province
  export_data /opt/module/datax/job/export/gmall_report.ads_page_path.json /warehouse/gmall/ads/ads_page_path
  export_data /opt/module/datax/job/export/gmall_report.ads_repeat_purchase_by_tm.json /warehouse/gmall/ads/ads_repeat_purchase_by_tm
  export_data /opt/module/datax/job/export/gmall_report.ads_trade_stats.json /warehouse/gmall/ads/ads_trade_stats
  export_data /opt/module/datax/job/export/gmall_report.ads_trade_stats_by_cate.json /warehouse/gmall/ads/ads_trade_stats_by_cate
  export_data /opt/module/datax/job/export/gmall_report.ads_trade_stats_by_tm.json /warehouse/gmall/ads/ads_trade_stats_by_tm
  export_data /opt/module/datax/job/export/gmall_report.ads_traffic_stats_by_channel.json /warehouse/gmall/ads/ads_traffic_stats_by_channel
  export_data /opt/module/datax/job/export/gmall_report.ads_user_action.json /warehouse/gmall/ads/ads_user_action
  export_data /opt/module/datax/job/export/gmall_report.ads_user_change.json /warehouse/gmall/ads/ads_user_change
  export_data /opt/module/datax/job/export/gmall_report.ads_user_retention.json /warehouse/gmall/ads/ads_user_retention
  export_data /opt/module/datax/job/export/gmall_report.ads_user_stats.json /warehouse/gmall/ads/ads_user_stats
  export_data /opt/module/datax/job/export/gmall_report.ads_activity_stats.json /warehouse/gmall/ads/ads_activity_stats
  export_data /opt/module/datax/job/export/gmall_report.ads_coupon_stats.json /warehouse/gmall/ads/ads_coupon_stats
  export_data /opt/module/datax/job/export/gmall_report.ads_sku_cart_num_top3_by_cate.json /warehouse/gmall/ads/ads_sku_cart_num_top3_by_cate
  ;;
esac