python MySQLdb使用教程详解

Python  /  管理员 发布于 7年前   155

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 MySQLdbimport jsonimport codecs# 这个自己改一下啊from utils.JsonUtil import get_json_from_filedef 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 inputdef 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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