"""
Test connection to MySQL
using mysql-client
conn = MySQLdb.connect(host,port,user,passwd,db,charset)
cursor = conn.cursor()
cursor.execute(sql, (arg1,arg2,arg3...))
conn.commit()
conn.rollback()
cursor.description # （col1,...），（col2,....），（col3,...），（col4,...）
cursor.rowcount
columns = map(lambda e:e[0], cursor.description)
columns = tuple(columns) # (col1,col2,col3...)
cur_record = cursor.fetchone() # (key1,key2,key3...)
cur_result = dict(zip(columns,cur_record)) # {col1:key1, col2:key2, col3:key3....}
cursor.close() # no more operation is valid if cursor closed
conn.close() # close connection to MySQL database
"""
import MySQLdb
import datetime
class MySQLHandler():
def __init__(self):
self.conn = None
self.cursor = None
self.cur_record = ()
self.host = ''
self.port = 0
self.user = ''
self.passwd = ''
self.db = ''
self.charset = 'utf8'
def connect(self, host, port, user, passwd, db, charset):
self.host = host
self.port = port
self.user = user
self.passwd = passwd
self.db = db
self.charset = charset
try:
self.conn = MySQLdb.connect(
host = self.host,
port = self.port,
user = self.user,
passwd = self.passwd,
db = self.db,
charset = self.charset
)
self.cursor = self.conn.cursor()
except MySQLdb.Error as e:
print("Conn MySQL Error, %d: %s" %(e.args[0], e.args[1]) )
def execute_one(self, sql, args):
self.cursor.execute(sql, args)
def insert_one(self,sql,args):
try:
# 如果多条插入语句都没异常，则直接通过commit()将数据写入db
# 如果任意一条语句产生异常，则进入except处理（还没运行try中的commit)
# except中可以全部不提交，或者提交没触发异常的sql语句
# 全部不提交, 则except中写入：self.conn.commit()
# 部分提交（没触发异常的语句结果，则except中写入：self.conn.commit()
self.cursor.execute(sql,args)
# write changes to db, if no exception
self.conn.commit()
except :
# drop data, if any exception happens, no data saved to db
self.conn.rollback()
def delete_one(self,sql,args):
try:
# 如果多条delete语句都没异常，则直接通过commit()将数据写入db
# 如果任意一条语句产生异常，则进入except处理（还没运行try中的commit)
# except中可以全部不提交，或者提交没触发异常的sql语句
# 全部不提交, 则except中写入：self.conn.commit()
# 部分提交（没触发异常的语句结果，则except中写入：self.conn.commit()
self.cursor.execute(sql,args)
# write changes to db, if no exception
self.conn.commit()
except :
# drop data, if any exception happens, no data saved to db
self.conn.rollback()
def show(self):
# show row count
print("Row Count: " + str(self.cursor.rowcount))
# get table column name
columns = map(lambda e: e[0], self.cursor.description)
columns = tuple(columns)
# show all results
self.cur_record = self.cursor.fetchone()
while self.cur_record != None:
print( dict(zip(columns, self.cur_record)) )
self.cur_record = self.cursor.fetchone()
def close(self):
# close connection to mysql
self.cursor.close()
self.conn.close()
# reset attributes
self.conn = None
self.cursor = None
self.cur_record = ()
self.host = ''
self.port = 0
self.user = ''
self.passwd = ''
self.db = ''
self.charset = 'utf8'
# Test MySQLHandler, create connection
mysql_handler = MySQLHandler()
mysql_handler.connect('localhost', 3306, 'root', 'weilan0415', 'news', 'utf8')
# prepare sql to execute
# sql = 'select * from employees where salary > %s limit %s, %s'
# args = (2500, 0, 10)
# run 1 sql operation
# mysql_handler.execute_one(sql, args)
# insert one record into mysql
sql = 'insert into news (title, image, content, types, create_at, is_valid) ' \
'value (%s, %s, %s, %s, %s, %s);'
cur_time = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
mysql_handler.insert_one(sql, ("new222", "D:\\Durian.jpg", "新闻内容222", "美食", cur_time, 1) )
# delete
sql = 'delete from news where id between 6 and 10'
mysql_handler.delete_one(sql, ())
# query
sql = 'select * from news'
mysql_handler.execute_one(sql, ())
# show result
mysql_handler.show()
# close connection
mysql_handler.close()
