Python——Mysql

一、导入  

        import pymysql

二、连接

def connect_wxremit_db():
return pymysql.connect(host='10.123.5.28',
port=3306,
user='root',
password='root1234',
database='db_name',
charset='latin1')
'''
hots:主机地址
port:端口号
user:用户
password:密码
database:数据库
charset:表
'''

三、查询

def query_country_name(cc2):
sql_str = ("SELECT Fcountry_name_zh"
+ " FROM t_country_code"
+ " WHERE Fcountry_2code='%s'" % (cc2))
logging.info(sql_str) #将内容写入日志 con = mysql_api.connect_wxremit_db() #执行连接数据库
cur = con.cursor() #使用cursor()方法获取操作游标
cur.execute(sql_str) #使用execute方法执行SQL语句
rows = cur.fetchall()#接收全部的返回结果行.
cur.close()
con.close() assert len(rows) == 1, 'Fatal error: country_code does not exists!'
return rows[0][0]

四、插入

def insert_file_rec(self, file_name, file_md5):
#连接数据库
con = mysql_api.connect_wxremit_db()
#获取操作游标
cur = con.cursor()
try:
#SQL语句
sql_str = ("INSERT INTO t_forward_file (Ffile_name, Ffile_md5)",
+ " VALUES ('%s', '%s')" % (file_name, file_md5))
#执行SQL语句
cur.execute(sql_str)
#提交到数据库
con.commit()
except:
#插入数据失败
con.rollback()
#写入日志
logging.exception('Insert operation error')
#当程序出现错误,通过raise显示地引发异常。后面的语句将不能执行
raise
finally:
cur.close()
con.close()

五、批量插入

remit_ids = [('', 'CAD'), ('', '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()

六、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()

七、删除

sql = "DELETE FROM EMPLOYEE WHERE AGE > %s" % (20)
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