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# -*- coding: utf-8 -*-
"""
Created on 2018-07-29 22:48:30
---------
@summary: 导出数据
---------
@author: Boris
@email: boris_liu@foxmail.com
"""
from typing import Dict, List, Tuple
import feapder.utils.tools as tools
from feapder.db.mysqldb import MysqlDB
from feapder.pipelines import BasePipeline
from feapder.utils.log import log
class MysqlPipeline(BasePipeline):
def __init__(self):
self._to_db = None
@property
def to_db(self):
if not self._to_db:
self._to_db = MysqlDB()
return self._to_db
def save_items(self, table, items: List[Dict]) -> bool:
"""
保存数据
Args:
table: 表名
items: 数据，[{},{},...]
Returns: 是否保存成功 True / False
若False，不会将本批数据入到去重库，以便再次入库
"""
sql, datas = tools.make_batch_sql(table, items)
add_count = self.to_db.add_batch(sql, datas)
datas_size = len(datas)
if add_count:
log.info(
"共导出 %s 条数据 到 %s, 重复 %s 条" % (datas_size, table, datas_size - add_count)
)
return add_count != None
def update_items(self, table, items: List[Dict], update_keys=Tuple) -> bool:
"""
更新数据
Args:
table: 表名
items: 数据，[{},{},...]
update_keys: 更新的字段, 如 ("title", "publish_time")
Returns: 是否更新成功 True / False
若False，不会将本批数据入到去重库，以便再次入库
"""
sql, datas = tools.make_batch_sql(
table, items, update_columns=update_keys or list(items[0].keys())
)
update_count = self.to_db.add_batch(sql, datas)
if update_count:
msg = "共更新 %s 条数据 到 %s" % (update_count // 2, table)
if update_keys:
msg += " 更新字段为 {}".format(update_keys)
log.info(msg)
return update_count != None