python 操作mysql数据库
python 操作mysql数据库，包括创建表，删除表，插入数据，删除数据，修改数据等操作。
# -*- coding: utf-8 -*-
import mysql.connector
import os
class MySqlDB:
#是否打印sql
print_sql = True
#数据库连接
mySql_Conn = None
def __init__(self):
'''初始化数据库连接'''
self.mySql_Conn = self.get_Conn()
def get_Conn(self):
#return mysql.connector.connect(user='root', password='', database='test', use_unicode=True)
return mysql.connector.connect(user='root', password='', database='python_test', charset='utf8')
def commit(self):
'''提交数据库事务'''
if self.mySql_Conn is not None:
self.mySql_Conn.commit()
def get_Cursor(self):
'''
该方法是获取数据库的游标对象，参数为数据库的连接对象
如果数据库的连接对象不为None，则返回数据库连接对象所创
建的游标对象；否则返回一个游标对象，该对象是内存中数据
库连接对象所创建的游标对象
'''
if self.mySql_Conn is not None:
return self.mySql_Conn.cursor()
else:
return self.mySql_Conn.cursor()
def close_Cursor(self,cursor):
'''关闭数据库游标对象和数据库连接对象'''
try:
if cursor is not None:
cursor.close()
finally:
if cursor is not None:
cursor.close()
################################################################
#创建表，删除表操作
################################################################
def create_Table(self, strSql):
'''创建数据库表：'''
if strSql is not None and strSql != '':
cursor = self.get_Cursor()
if self.print_sql:
print('执行sql:[{}]'.format(strSql))
cursor.execute(strSql)
self.commit()
print('创建数据库表成功!')
self.close_Cursor(cursor)
else:
print('the [{}] is empty or equal None!'.format(strSql))
def drop_Table(self,table):
'''如果表存在,则删除表，如果表中存在数据的时候，使用该
方法的时候要慎用！'''
if table is not None and table != '':
strSql = 'DROP TABLE IF EXISTS ' + table
if self.print_sql:
print('执行sql:[{}]'.format(strSql))
cursor = self.get_Cursor()
cursor.execute(strSql)
self.commit()
print('删除数据库表[{}]成功!'.format(table))
self.close_Cursor(cursor)
else:
print('the [{}] is empty or equal None!'.format(strSql))
#####################################################################
#数据库操作
#####################################################################
def insert_MultiData(self,strSql, data):
'''插入数据'''
if strSql is not None and strSql != '':
if data is not None:
cursor = self.get_Cursor()
for d in data:
if self.print_sql:
print('执行sql:[{}],参数:[{}]'.format(strSql, d))
cursor.execute(strSql, d)
self.commit()
self.close_Cursor(cursor)
else:
print('the [{}] is empty or equal None!'.format(strSql))
def insert_Data(self,strSql):
'''插入数据'''
if strSql is not None and strSql != '':
cursor = self.get_Cursor()
print('执行sql:[{}]'.format(strSql))
cursor.execute(strSql)
self.commit()
self.close_Cursor(cursor)
else:
print('the [{}] is empty or equal None!'.format(strSql))
def get_All_Item(self,strSql):
'''查询所有数据'''
if strSql is not None and strSql != '':
cursor = self.get_Cursor()
if self.print_sql:
print('执行sql:[{}]'.format(strSql))
cursor.execute(strSql)
listR = cursor.fetchall()
self.close_Cursor(cursor)
return listR
else:
print('the [{}] is empty or equal None!'.format(strSql))
return None
def get_One_Item(self,strSql, data):
'''查询一条数据'''
if strSql is not None and strSql != '':
if data is not None:
#Do this instead
d = (data,)
cursor = self.get_Cursor()
if self.print_sql:
print('执行sql:[{}],参数:[{}]'.format(strSql, data))
cursor.execute(strSql, d)
r = cursor.fetchall()
if len(r) > 0:
for e in range(len(r)):
print(r[e])
else:
print('the [{}] equal None!'.format(data))
else:
print('the [{}] is empty or equal None!'.format(strSql))
def update_Data(self,strSql, data):
'''更新数据'''
if strSql is not None and strSql != '':
if data is not None:
cursor = self.get_Cursor()
for d in data:
if self.print_sql:
print('执行sql:[{}],参数:[{}]'.format(strSql, d))
cursor.execute(strSql, d)
self.commit()
self.close_Cursor(cursor)
else:
rint('the [{}] is empty or equal None!'.format(strSql))
def delete_multiData(self,strSql, data):
'''删除多条sql数据'''
if strSql is not None and strSql != '':
if data is not None:
cursor = self.get_Cursor()
for d in data:
if self.print_sql:
print('执行sql:[{}],参数:[{}]'.format(strSql, d))
cursor.execute(strSql, d)
self.commit()
self.close_Cursor(cursor)
else:
rint('the [{}] is empty or equal None!'.format(strSql))
def delete_Data(self,strSql):
'''删除一条sql数据'''
if strSql is not None and strSql != '':
if self.print_sql:
print('执行sql:[{}]'.format(strSql))
cursor = self.get_Cursor()
cursor.execute(strSql)
self.commit()
self.close_Cursor(cursor)
else:
print('the [{}] is empty or equal None!'.format(strSql))
#########################################################################
#测试代码
#########################################################################
db = MySqlDB()
#删除数据表
#db.drop_Table('person')
#ENGINE=InnoDB DEFAULT CHARSET=utf8
#创建数据库表
create_table_sql = '''CREATE TABLE `person` (
`id` int(11) NOT NULL,
`name` varchar(20) NOT NULL,
`gender` varchar(4) DEFAULT NULL,
`age` int(11) DEFAULT NULL,
`address` varchar(200) DEFAULT NULL,
PRIMARY KEY (`id`)
);'''
#db.create_Table(create_table_sql)
#删除数据、
delSql='delete from person '
#db.delete_Data(delSql)
#插入数据测试,插入一条语句
insert_sql ='''INSERT INTO person VALUES (3, 'xiaoli', '女', 18, '山东')'''
#db.insert_Data(insert_sql)
#插入数据测试,插入多条语句
insert_sql = '''INSERT INTO person values (%s, %s, %s, %s, %s)'''
data = [[1, 'xiaowang', '男', 20, '广东'],
[2, 'xiaozhang', '男', 22, '河南'],
[3, 'xiaoli', '男', 18, '山东'],
[4, 'xiaoliu', '女', 21, '山西']]
db.insert_MultiData(insert_sql,data)
#查询数据
a= db.get_All_Item('select * from person')
for item in a:
for it in item:
print it
