当数据库里面的价格变化时，发送信息到企业微信中

mysql insert 触发器

添加insert触发器，在insert一条新纪录时，当主单号不为空，并且新增价格和最近一次价格对比不相等时，说明价格有变化。这时触发器会自动将上一次老价格添加到当前新增行的unit_price_old老价格列。

这个需求是在一个表上，更新自己身上的其他列，这时需要用before，并且set new.列名，并且new必须在等号左边。

delimiter //create trigger insert_flight_cabin_unit_pricebeforeinsert on flight_cabin_book_o_updatefor each rowbegin/*注意給变量赋值，等号右边的select必须加括号*//*获取每条主单号的最近一次更新时间*/set @last_creat_time = (select creat from flight_cabin_book_o_update where waybill=new.waybill and flight_no=new.flight_no and flight_time=new.flight_time order by creat desc limit 1);/*获取每条主单号的最近一次更新价格*/set @last_unit_price = (select unit_price from flight_cabin_book_o_update where waybill=new.waybill and flight_no=new.flight_no and flight_time=new.flight_time and creat = @last_creat_time limit 1);/*如果一个主单号不为空，并且最近一次价格和现在insert的价格不相同，就说明价格更新了*/if new.waybill is not null and new.waybill !='' and new.unit_price != @last_unit_price thenset new.unit_price_old = @last_unit_price;set new.unit_price_old_time = @last_creat_time;end if;end //delimiter ;

mysql update触发器

这个是在一个表上update自己身上的其他列，也需要用before，并且 set new.列名，并且new必须在等号左边

delimiter //create trigger update_flight_cabin_unit_pricebeforeupdate on czxfor each rowbeginif new.unit_price != old.unit_price thenset new.unit_price_old = old.unit_price;set new.is_update_price = 'Y';set new.update_price_time=now();end if;end //delimiter ;

python脚本动态监听

#!/usr/bin/python# -*- coding:utf8 -*-# author: chenzhixinfrom contextlib import contextmanagerimport pymysql as mysqldbimport requestsimport time@contextmanagerdef get_mysql_conn(**kwargs):    """    建立MySQL数据库连接    :param kwargs:    :return:    """    conn = mysqldb.connect(host=kwargs.get('host', 'localhost'),                           user=kwargs.get('user'),                           password=kwargs.get('password'),                           port=kwargs.get('port', 3306),                           database=kwargs.get('database')                           )    try:        yield conn    finally:        if conn:            conn.close()def execute_mysql_select_sql(conn, sql):    """    执行mysql的select类型语句    :param conn:    :param sql:    :return:    """    with conn as cur:        cur.execute(sql)        rows = cur.fetchall()    return rowsdef execute_mysql_sql(conn, sql):    """    执行mysql的dml和ddl语句，不包括select语句    :param conn:    :param sql:    :return:    """    with conn as cur:        cur.execute(sql)def get_mysql_flight_cabin_book_o_update_data(conn):    """    获取 kb_kettle_data.flight_cabin_book_o_update的数据    :param conn:    :return:    """    sql = "select " \          "id, " \          "waybill, " \          "flight_no," \          "flight_time," \          "unit_price, " \          "unit_price_old, " \          "unit_price_old_time," \          "creat " \          "from flight_cabin_book_o_update   " \          "where unit_price_old is not null"    mysql_table_rows = execute_mysql_select_sql(conn, sql)    if mysql_table_rows:        print('检测到价格变化:\n', mysql_table_rows)    for index, row in enumerate(mysql_table_rows, 1):        id = row[0]        waybill = row[1]        flight_no = row[2]        flight_time = row[3]        unit_price = row[4]        unit_price_old = row[5]        unit_price_old_time = row[6]        creat = row[7]        yield {'id': id,               'waybill': waybill,               'flight_no': flight_no,               'flight_time': flight_time,               'unit_price': unit_price,               'unit_price_old': unit_price_old,               'unit_price_old_time': unit_price_old_time,               'creat': creat               }def send_to_qyweixin(dic):    """    发送消息到企业微信    :param dic:    :return:    """    headers = {"Content-Type": "text/plain"}    # s = "--石墨价格变化通知--\n主单号：{waybill}\n航班号：{flight_no}\n航班日期：{flight_time}\n\n时间1：{unit_price_old_time}\n-----------------------\n价格1：{unit_price_old}\n-----------------------\n{creat}\n主单号：{waybill}\n价格变为: {unit_price}".format(    #     waybill=dic['waybill'],    #     unit_price_old=dic['unit_price_old'],    #     unit_price_old_time=dic['unit_price_old_time'],    #     creat=dic['creat'],    #     unit_price=dic['unit_price']    # )    s = """---石墨价格变化通知---主单号：{waybill}航班号：{flight_no}航班日期：{flight_time}时间1：{unit_price_old_time}价格1：{unit_price_old}时间2：{creat}价格2：{unit_price}    """.format(        waybill=dic['waybill'],        flight_no=dic['flight_no'],        flight_time=dic['flight_time'],        unit_price_old=dic['unit_price_old'],        unit_price_old_time=dic['unit_price_old_time'],        creat=dic['creat'],        unit_price=dic['unit_price']    )    data = {        "msgtype": "text",        "text": {            "content": s,        }    }    r = requests.post(        url='https://qyapi.weixin.qq.com/cgi-bin/webhook/sexxxd5-eb13',        headers=headers, json=data)    print(r.text)def main():    mysql_conn_args = dict(user='user1',                           host='10.xx.xx.xx',                           password='123456',                           database='xxxxx')    with get_mysql_conn(**mysql_conn_args) as mysql_conn:        while True:            print('正在监听价格是否有变化.....')            # 1、首先获取mysql_flight_cabin_book_o_update表中有价格更新的所有行数据            mysql_data_dic = get_mysql_flight_cabin_book_o_update_data(mysql_conn)            # 2、其次遍历有价格变化的行数据，发送给企业微信            for dic in mysql_data_dic:                # 发送到企业微信                send_to_qyweixin(dic)                # 3、最后把mysql_flight_cabin_book_o_update表中的标记位is_update_price置为空                update_flag_sql = "update flight_cabin_book_o_update set unit_price_old=null,unit_price_old_time=null where waybill='{}'".format(dic['waybill'])                execute_mysql_sql(mysql_conn, update_flag_sql)            time.sleep(60)if __name__ == '__main__':    main()

运行脚本

[root@gfs02 wangsn]# nohup python /usr/local/shell/monitor_price_qywx/monitor_price_to_qiyeweixin.py > /dev/null 2>&1 &

效果图