二十三、python mysqlDB的安装和使用
MySQLdb安装和使用
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import MySQLdb #该插件，windows中直接安装该MySQL-python-1.2.3.win-amd64-py2.7.exe即可
#定义获取连接所必须的属性
conf={
'host':'192.168.216.7',
'port':3306,
'user':'root',
'passwd':'root', #和connector的区别
'db':'test', #和connector的区别
'charset':'utf8' #默认就是utf-8
}
try:
conn = MySQLdb.connect(**conf)
except MySQLdb.Error as e:
print ('connect failed !'.format(e))
#设置conn自动提交和获取cursor
conn.autocommit(True) #和connector的区别
cursor = conn.cursor()
print conn
# ###################################1、创建表
try:
sql_create = 'CREATE TABLE `user2` ( \
`id` int(11) NOT NULL AUTO_INCREMENT, \
`name` varchar(20) DEFAULT NULL, \
`age` int(1) DEFAULT NULL, \
PRIMARY KEY (`id`) \
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8 \
'
# 提交表创建
#cursor.execute(sql_create)
except MySQLdb.Error as e:
print (u'创建表失败'.format(e))
########################################编写插入sql语句
try:
sql_insert1 = 'insert into user2(name,age) VALUES("你好 ",20)' # id为递增，不用写都可以
# 使用cursor执行sql语句
cursor.execute(sql_insert1)
# b、元组方式插入
sql_insert2 = 'insert into user2(name,age) VALUES(%s,%s) ' # %s不是格式化符，而是占位符。所以age也是%s
data = ('你好tuple', 18)
cursor.execute(sql_insert2, data)
# c、使用字典方式插入
sql_insert3 = 'insert into user2(name,age) VALUES(%(name)s,%(age)s) ' # %()s : 中的字段与字典中赋值字段相同
data1 = {'name': "你好dict", 'age': 16}
cursor.execute(sql_insert3, data1)
##############################################支持多次插入 使用
sql_insert4 = 'insert into user2(name,age) VALUES(%s,%s) ' # %s不是格式化符，而是占位符。所以age也是%s
data2 = [('你好tuple', 18), ('你t', 16), ('好uple', 12)]
cursor.executemany(sql_insert4,data2)
# 引入faker包的Factory模块 来生成伪数据
# 安装 pip install fake-factory(老版本) 或者 pip install fake
# 卸载 pip uninstall fake-factory 或者 pip uninstall fake ,重报错信息可知道，需要重新安装Faker
# ImportError: The ``fake-factory`` package is now called ``Faker``
# from faker import factory
# userFaker = factory.Factory.create() #pip install fake-factory包中的
# print userFaker.name()
from faker import Factory
userFaker = Factory.create()
# print userFaker.name(),userFaker.email(),userFaker.address(),userFaker.text()
sql_insert5 = 'insert into pyuser(name,email,address,content) VALUES(%s,%s,%s,%s) '
userFakerData = [(userFaker.name(), userFaker.email(), userFaker.address(), userFaker.text()) for i in range(1, 20)]
# print userFakerData
cursor.executemany(sql_insert5,userFakerData)
except MySQLdb.Error as e:
print (u'插入数据异常.'.format(e))
#finally:
#conn.close()
#cursor.close()
######################################更新数据,,尝试批量更新？？？
try:
sql_update = 'update user2 set age = 16'
cursor.execute(sql_update)
except MySQLdb.Error as e:
print (u'更新失败'.format(e))
# finally:
# cursor.close()
# conn.close()
#####################################查询
try:
sql_select = 'select id,name from user2 where age > %s and age < %s'
cursor.execute(sql_select, (16, 18))
#print cursor.fetchall()
for id,name in cursor:
print '%s age is older than 18,and her/his id is %d'%(name, id)
##################################删除 尝试删除多个？？？
sql_delete ='delete from user2 where age=%(age)s and name=%(name)s'
deleteData = {'age': 18, 'name': u'你好tuple'}
cursor.execute(sql_delete, deleteData)
except MySQLdb.Error as e:
print (u'查询和删除失败'.format(e))
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