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pymysql模块初识
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SQL的注入问题
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pymysql的增删改
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pymysql的查询
1.pymysql模块初识
import pymysql
conn = pymysql.connect(host=‘localhost‘,user=‘root‘,password=‘ren666666‘,database=‘test1‘,charset=‘utf8‘)
cursor = conn.cursor()
print(‘----1----‘)
sql = "SELECT * FROM chart1"
cursor.execute(sql)
result = cursor.fetchone()
cursor.close()
conn.close()
print(result)
sql = "SELECT * FROM chart1 where username=‘%s‘ and password=‘%s‘"%(user,pwd) #这样以字符串拼接会出现sql注入的问题
cursor.execute(sql)
问题如下：
假如输入的user=uu‘ or 1=1 --
会发生一下情况
select * from chart1 where username=‘uu‘ or 1=1 --‘ and password=‘%s‘ #注意这里的--是mysql中的注释
这将会导致，即使不输入密码，账号也不知道的情况下，依然能够登陆成功
插入单个值
import pymysql
user = 1
pwd = ‘pycharm‘
conn = pymysql.connect(host=‘localhost‘,user=‘root‘,password=‘ren666666‘,database=‘test1‘)
cursor = conn.cursor()
print(‘----1----‘)
sql = "insert into chart1(id,name) values(%s,%s)"
cursor.executemany(sql,[user,pwd])
result = cursor.fetchone()
cursor.close()
conn.close()
print(result)
#插入多个值
import pymysql
conn = pymysql.connect(host=‘localhost‘,user=‘root‘,password=‘ren666666‘,database=‘test1‘)
cursor = conn.cursor()
print(‘----1----‘)
sql = "insert into chart1(id,name) values(%s,%s)"
cursor.executemany(sql,[(5,‘pycharm‘),(6,‘sublime‘)])
result = cursor.fetchone()
cursor.close()
conn.close()
print(result)
4.pymysql的查询：
import pymysql
conn = pymysql.connect(host=‘localhost‘,user=‘root‘,password=‘ren666666‘,database=‘test1‘)
cursor = conn.cursor()
print(‘----1----‘)
sql = "select * from chart1"
cursor.execute(sql)
# result = cursor.fetchone() #只能拿到一个数据
# result = cursot.fetchall() #拿到所以数据
result = cursor.fetchmany(4) #拿到4个数据
print(result)
cursor.close()
conn.close()
import pymysql
conn = pymysql.connect(host=‘localhost‘,user=‘root‘,password=‘ren666666‘,database=‘test1‘)
#cursor = conn.cursor() #这个的话会返回元组类型的结果
cursor = conn.cursor(cursor=pymysql.cursors.DictCursor) #这个会以字典形式返回
print(‘----1----‘)
sql = "select * from chart1"
cursor.execute(sql)
result = cursor.fetchmany(4) #拿到4个数据
print(result)
cursor.close()
conn.close()
# [{‘id‘: 1, ‘name‘: ‘python‘}, {‘id‘: 2, ‘name‘: ‘pycharm‘}, {‘id‘: 3, ‘name‘: ‘pycharm‘}, {‘id‘: 4, ‘name‘: ‘anaconda‘}]
