>>> import pymysql
>>> conn=pymysql.connect(host='localhost',user='root',passwd='password',charset='utf8',port=3306)
#port一般都是3306，charset要写utf8，不然可能会出现乱码
>>> cur=conn.cursor()
#查看有哪些数据库
>>> cur.execute('show databases')
>>> databases=[]
>>> for i in cur:databases.append(i)
>>> databases
[('information_schema',), ('firstdb',), ('hive',), ('jeesite',), ('mysql',), ('school',), ('test',), ('test1',), ('test2015',)]
#选择数据库
>>> conn.select_db('test')
#如果一开始就知道选什么数据库，可以把数据库参数加到connect的语句里：
#conn=pymysql.connect(host='localhost',user='root',passwd='password',db='test',charset='utf8',port=3306)
#查看有哪些表
>>> cur.execute('show tables')
#fetchall是获得所有的查询结果
>>> tables_list=cur.fetchall()
>>> tables_list
(('user',), ('user2',), ('user3',), ('user4',), ('user5',), ('user6',), ('user7',))
#创建table
>>> cur.execute('create table user8(id varchar(10),name varchar(10))')
#如果习惯于每一个colmn单独一行，可以用'''代替'
>>> cur.execute('''create table user8(id varchar(10),
name varchar(10))''')
#查看表user,execute中的语句语法跟mysql中的一样
>>> cur.execute('select * from user')
>>> user_select_result=cur.fetchall()
>>> user_select_result
(('1', 'Michael'), ('11', 'ozil'), ('12', 'Giroud'), ('2', 'Henry'), ('Alexis', '17'), ('Ramsey', '16'), ('Walcott', '14'))
>>> cur.execute('select * from user')
#fetchone只获得第一条查询结果
>>> user_select_result=cur.fetchone()
>>> user_select_result
('1', 'Michael')
>>> cur.execute('select * from user')
#fetchmany(n)，可以获得n条查询结果
>>> user_select_result=cur.fetchmany(4)
>>> user_select_result
(('1', 'Michael'), ('11', 'ozil'), ('12', 'Giroud'), ('2', 'Henry'))
#插入数据，注意插入语句的插入参数一定要是变量，不能是直接一个set
>>> insert_value=('3','gibbs')
>>> cur.execute('insert into user(id,name) values(%s,%s)',insert_value)
>>> cur.execute('select * from user')
>>> user_select_result=cur.fetchall()
>>> user_select_result
(('1', 'Michael'), ('11', 'ozil'), ('12', 'Giroud'), ('2', 'Henry'), ('3', 'gibbs'), ('Alexis', '17'), ('Ramsey', '16'), ('Walcott', '14'))
insert_value_list=[('22','debucy'),('33','cech')]
#插入多条数据，需要用executemany
>>> cur.executemany('insert into user(id,name) values(%s,%s)',insert_value_list)
>>> cur.execute('select * from user')
>>> user_select_result=cur.fetchall()
>>> user_select_result
(('1', 'Michael'), ('11', 'ozil'), ('12', 'Giroud'), ('2', 'Henry'), ('22', 'debucy'), ('3', 'gibbs'), ('33', 'cech'), ('Alexis', '17'), ('Ramsey', '16'), ('Walcott', '14'))
#只有conn.commit()后，对数据库的修改才会提交
>>> conn.commit()
>>> cur.execute('update user set name="Ozil" where id="11"')
>>> user_select_result=cur.fetchall()
>>> user_select_result
()
>>> cur.execute('select * from user')
>>> user_select_result=cur.fetchall()
>>> user_select_result
(('1', 'Michael'), ('11', 'Ozil'), ('12', 'Giroud'), ('2', 'Henry'), ('22', 'debucy'), ('3', 'gibbs'), ('33', 'cech'), ('Alexis', '17'), ('Ramsey', '16'), ('Walcott', '14'))
#修改后一定要comiit，不然删除、更新、添加的数据都不会被写进数据库中。
>>> conn.commit()
#最后要把cur和conn都关掉
>>> cur.close()
>>> conn.close()