python MySQLdb使用教程详解

本文主要内容pythonMySQLdb数据库批量插入insert，更新update的：1.pythonMySQLdb的使用，写了一个

本文主要内容python MySQLdb数据库批量插入insert，更新update的：

1.python MySQLdb的使用，写了一个基类让其他的sqldb继承这样比较方便，数据库的ip, port等信息使用json配置文件

2.常见的查找，批量插入更新

下面贴出基类代码：

# _*_ coding:utf-8 _*_
import MySQLdb
import json
import codecs
# 这个自己改一下啊
from utils.JsonUtil import get_json_from_file
def byteify(input):
 """
 the string of json typed unicode to str in python
 This function coming from stack overflow
 :param input: {u'first_name': u'Guido', u'last_name': u'jack'}
 :return: {'first_name': 'Guido', 'last_name': 'jack'}
 """
 if isinstance(input, dict):
 return {byteify(key): byteify(value)
 for key, value in input.iteritems()}
 elif isinstance(input, list):
 return [byteify(element) for element in input]
 elif isinstance(input, unicode):
 return input.encode('utf-8')
 else:
 return input
def get_json_from_file(filename):
 with open(filename) as jf:
 jsondata = json.load(jf)
 return byteify(jsondata)
class DbBase(object):
 def __init__(self, **kwargs):
 self.db_config_file = kwargs['db_config_file']
 self.config_db(self.db_config_file)
 def config_db(self, db_config_file):
 data = get_json_from_file(db_config_file)
 host = data['host']
 user = data['user']
 pwd = data['pwd']
 db = data['db']
 port = data['port']
 self.tb_audit_mobile = data['tb_audit_mobile']
 self.conn = MySQLdb.connect(host=host, port=port, user=user, passwd=pwd, db=db, charset="utf8", use_unicode=True)
 self.cursor = self.conn.cursor()

子类的示例：

class DbAuditTestService(DbBase):
 def __init__(self, **kwargs):
 super(DbAuditTestService, self).__init__(**kwargs)
 def getAdTestURl(self, beg, end):
 sql = """select url, source from tb_name where create_date BETWEEN '%s' and '%s' """ % (beg, end)
 self.cursor.execute(sql)
 res = [row for row in self.cursor]
 return res
 def insert(self, lst_row):
 """batch insert, use ignore 避免索引唯一问题"""
 try:
 insert_sql = 'INSERT ignore INTO tb_ms_mobile_report_test (appid, source) VALUES (%s, %s)'
 self.cursor.executemany(insert_sql, lst_row)
 self.conn.commit()
 except MySQLdb.OperationalError as e:
 logger.info('%s' % e)
 self.cursor.close()
 self.conn.close()
 self.config_db(self.db_config_file)
 def update_ip_info(self, ip_info):
 """
 batch update 
 [[voilate_right_rate, ip]]
 :param ip_info:
 :return:
 """
 query = """
 update tb_ms_audit_ip_info set
 ip_right_rate=%s
 where submit_ip=%s """
 self.cursor.executemany(query, ip_info)
 self.conn.commit()
def insert_all():
"""批量操作的示例"""
 db_audit = DbAuditService(db_config_file='../config/mysql_police_audit.json')
 size = db_audit.count()
 db_audit_test = DbAuditTestService(db_config_file='../config/mysql_local_audit.json')
 batch_size = 2000
 for k in xrange(100000, size, batch_size):
 logger.info('query limit %s ~ %s' % (k, batch_size))
 lst_row = db_audit.query_limit(k, batch_size)
 logger.info('convert_rows ')
 lst_row = convert_rows(lst_row)
 db_audit_test.insert(lst_row)

总结

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