關于Python 操作 MySQL ,這才是正確姿勢:
使用Python進行MySQL的庫主要有三個,Python-MySQL(更熟悉的名字可能是MySQLdb),PyMySQL和SQLAlchemy,
Python-MySQL資格最老,核心由C語言打造,介面精煉,性能最棒,缺點是環境依賴較多,安裝復雜,近兩年已停止更新,只支持Python2,不支持Python3,
PyMySQL為替代Python-MySQL而生,純python打造,介面與Python-MySQL兼容,安裝方便,支持Python3,
SQLAlchemy是一個ORM框架,它并不提供底層的資料庫操作,而是要借助于MySQLdb、PyMySQL等第三方庫來完成,目前SQLAlchemy在Web編程領域應用廣泛,
本文主要介紹PyMySQL的正確使用方法,示例代碼都是選自實戰專案,
安裝
簡單的方式:
pip install pymysql
如果無法聯網,需要進行離線安裝,例如:
pip install pymysql-x.x.x.tar.gz
匯入
import pymysql
連接
def connect_wxremit_db(): return pymysql.connect(host='10.123.5.28', port=3306, user='root', password='root1234', database='db_name', charset='latin1')
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def query_country_name(cc2): sql_str = ("SELECT Fcountry_name_zh" + " FROM t_country_code" + " WHERE Fcountry_2code='%s'" % (cc2)) logging.info(sql_str) con = mysql_api.connect_wxremit_db() cur = con.cursor() cur.execute(sql_str) rows = cur.fetchall() cur.close() con.close() assert len(rows) == 1, 'Fatal error: country_code does not exists!' return rows[0][0]
簡單插入
def insert_file_rec(self, file_name, file_md5): con = mysql_api.connect_wxremit_db() cur = con.cursor() try: sql_str = ("INSERT INTO t_forward_file (Ffile_name, Ffile_md5)", + " VALUES ('%s', '%s')" % (file_name, file_md5)) cur.execute(sql_str) con.commit() except: con.rollback() logging.exception('Insert operation error') raise finally: cur.close() con.close()
批量插入
remit_ids = [('1234', 'CAD'), ('5678', 'HKD')] con = mysql_api.connect_wxremit_db() cur = con.cursor() try: cur.executemany("INSERT INTO t_order (Fremit_id, Fcur_type, Fcreate_time" + " VALUES (%s, %s, now())", new_items) assert cur.rowcount == len(remit_ids), 'my error message' con.commit() except Exception as e: con.rollback() logging.exception('Insert operation error') finally: cur.close() con.close()
更新
def update_refund_trans(self, remit_id): con = mysql_api.connect_wxremit_db() cur = con.cursor() try: sql_str = ("SELECT Fremit_id" + " FROM t_wxrefund_trans" + " WHERE Fremit_id='%s'" % remit_id + " FOR UPDATE") logging.info(sql_str) cur.execute(sql_str) assert cur.rowcount == 1, 'Fatal error: The wx-refund record be deleted!' sql_str = ("UPDATE t_wxrefund_trans" + " SET Fcheck_amount_flag=1" + ", Fmodify_time=now()" + " WHERE Fremit_id='%s'" % remit_id logging.info(sql_str) cur.execute(sql_str) assert cur.rowcount == 1, 'The number of affected rows not equal to 1' con.commit() except: con.rollback() logging.exception('Update operation error') raise finally: cur.close() con.close()
PyMySQL已經相當成熟,和Python-MySQL一樣,它在很多Linux發行版本中都是可選的安裝組件,
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標籤:Python
