python数据库批量插入数据的实现(executemany的使用)

正常情况下往数据库多张表中批量插入1000条数据，若一条一条insert插入，则调用sql语句查询插入需要执行几千次，花费时间长

现使用cursor.executemany（sql，args） ，可对数据进行批量插入，其中args是一个包含多个元组的list列表，每个元组对应mysql当中的一条数据

以下是实例：往数据库中的order表、order_detail表和pay表中插入1000条订单数据，订单详情数据以及支付数据1.pay表中的id字段是order表中的pay_id字段2.order表中的id字段是order_detail表中的order_id字段

1.初始化属性(包括host、port、user、password和database）

def __init__(self):self.__db_host=XXXself.__db_port=XXXself.__db_user=XXXself.__db_password=XXXself.__db_database=XXX

2.连接数据库

def isConnection(self):self.__db=pymysql.connect( host=self.__db_host, port=self.__db_port, user=self.__db_user, password=self.__db_password, database=self.__db_database, charset=’utf8’)

3.批量往pay表中插入1000条数据

# 插入数据进pay表 def pay_insert(self,pay_value):try: # 连接数据库 self.isConnection() # 创建游标 global cursor cursor=self.__db.cursor() # 执行 cursor.executemany(’insert into `pay表`(type,pay_money,pay_time,pay_no,STATUS,create_by,create_time,update_by,update_time) value (%s,%s,%s,%s,%s,%s,%s,%s,%s)’,pay_value)except Exception as e: print efinally: cursor.close() self.__db.commit() self.__db.close() # 生成pay表所需字段，并调用sql def pay_data(self):pay_value=list()for i in range(1,1000): pay_value.append((0,8800,time.localtime(),str(random.randint(712300000000,712399999999)),3,49338,time.localtime(),49338,time.localtime()))now_time=time.localtime()self.pay_insert(pay_value)return now_time

4.pay表中生成的1000条数据，依次取出id

# 获取pay_id def get_pay_id(self,now_time):try: self.isConnection() global cursor cursor=self.__db.cursor() cursor.execute(’select id from `pay表` where create_time >= %s’,now_time) id_value=list() for i in range(1,1000):pay_id=cursor.fetchone()id_value.append(pay_id) return id_valueexcept Exception as e: print efinally: cursor.close() self.__db.commit() self.__db.close()

以下是完整代码：

# #!/usr/bin/python# # -*- coding: UTF-8 -*-import pymysql # 先pip install pymysqlimport randomimport timeclass DatabaseAcess: # 初始化属性(包括host、port、user、password和database） def __init__(self):self.__db_host=XXXself.__db_port=XXXself.__db_user=XXXself.__db_password=XXXself.__db_database=XXX # 连接数据库 def isConnection(self):self.__db=pymysql.connect( host=self.__db_host, port=self.__db_port, user=self.__db_user, password=self.__db_password, database=self.__db_database, charset=’utf8’) # 插入数据进pay表 def pay_insert(self,pay_value):try: # 连接数据库 self.isConnection() # 创建游标 global cursor cursor=self.__db.cursor() # 执行 cursor.executemany(’insert into `pay表`(type,pay_money,pay_time,pay_no,STATUS,create_by,create_time,update_by,update_time) value (%s,%s,%s,%s,%s,%s,%s,%s,%s)’,pay_value)except Exception as e: print efinally: cursor.close() self.__db.commit() self.__db.close() # 生成pay表所需字段，并调用sql def pay_data(self,data_number):pay_value=list()for i in range(1,data_number): pay_value.append((0,8800,time.localtime(),str(random.randint(712300000000,712399999999)),3,49338,time.localtime(),49338,time.localtime()))now_time=time.localtime()self.pay_insert(pay_value)return now_time # 获取pay_id def get_pay_id(self,now_time,data_number):try: self.isConnection() global cursor cursor=self.__db.cursor() cursor.execute(’select id from `pay表` where create_time >= %s’,now_time) id_value=list() for i in range(1,data_number):pay_id=cursor.fetchone()id_value.append(pay_id) return id_valueexcept Exception as e: print efinally: cursor.close() self.__db.commit() self.__db.close() # 插入数据进order表 def order_insert(self,order_value):try: self.isConnection() global cursor cursor=self.__db.cursor() cursor.executemany(’insert into `order表` (student_name,student_id,school_id,school_name,tel,height,sex,pay_id,order_no,status,original_price,payment_price,order_type,create_by,create_time,update_by,update_time,purchase_id,dept_id,sub_order_mid,class_name,shoe_size,student_no,weight) value (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)’,order_value)except Exception as e: print efinally: cursor.close() self.__db.commit() self.__db.close() # 生成order表所需字段，并调用sql def order_data(self,id_value,data_number):order_value=list()for i in range(1,data_number): pay_id=str(id_value[i-1]).replace('L,)','').replace('(','') order_value.append(('周瑜',35999,346,'A城小学','13322222222',130,1,pay_id,str(random.randint(7100000000,7999999999)),2,8800,8800,1,49338,time.localtime(),49338,time.localtime(),405,121,564123698745632,'三年级 3班',30,30,30))sys_time=time.localtime()self.order_insert(order_value)return sys_time # 获取order_id def get_order_id(self,sys_time,data_number):try: self.isConnection() global cursor cursor=self.__db.cursor() cursor.execute(’select id from `order表` where create_time >= %s’,sys_time) order_id_list=list() for i in range(1,data_number):order_id_list.append(cursor.fetchone()) return order_id_listexcept Exception as e: print efinally: cursor.close() self.__db.commit() self.__db.close() # 插入数据进order_detail表 def order_detail_insert(self,detail_value):try: self.isConnection() global cursor cursor=self.__db.cursor() cursor.executemany(’insert into `order_details表` (order_id,commodity_name,commodity_id,original_price,payment_price,img,number,status,create_by,create_time,update_by,update_time) value (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)’,detail_value)except Exception as e: print efinally: cursor.close() self.__db.commit() self.__db.close() # 生成order_detail表所需字段，并调用sql def order_detail_data(self,order_id_list,data_number):detail_value=list()for i in range(1,data_number): order_id=str(order_id_list[i-1]).replace('L,)','').replace('(','') detail_value.append((order_id,'A城小学春季校服','1382932636506902530',8800,8800,'https://ygxf-dev2.obs.cn-north-1.myhuaweicloud.com:443/image%2F1618551784845-589.jpg',1,2,49338,time.localtime(),49338,time.localtime()))self.order_detail_insert(detail_value)if __name__ == ’__main__’: db=DatabaseAcess() data_number=3 db.order_detail_data(order_id_list=db.get_order_id(sys_time=db.order_data(id_value=db.get_pay_id(now_time=db.pay_data(data_number=data_number),data_number=data_number),data_number=data_number),data_number=data_number),data_number=data_number) print ('{0}条数据插入完成'.format(data_number-1))

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