python 学习_第四模块 python 对mysql的操作

python 学习_第四模块 python 对mysql的操作

1 查询

import  pymysql

user="egon1"
pwd="123"

conn = pymysql.connect(
    host="10.0.0.87",
    user="test",
    password="123456",
    database="db10",
    charset="utf8"
)

cursor = conn.cursor()

sql = "select * from test1 where name=%s and password=%s"

res = cursor.execute(sql,[user,pwd])

if res:
    print("ok")
else:
    print("error")


cursor.close()
conn.close()

2. 插入 修改 删除

import  pymysql
conn = pymysql.connect(
    host="10.0.0.87",
    user="test",
    password="123456",
    database="db10",
    charset="utf8")

# 游标
cursor = conn.cursor()

sql = 'insert into test1(name,password) value("ysl","111");'
res = cursor.execute(sql)
print(res)
conn.commit()
cursor.close()
conn.close()

import  pymysql
conn = pymysql.connect(
    host="10.0.0.87",
    user="test",
    password="123456",
    database="db10",
    charset="utf8")

# 游标
cursor = conn.cursor()
sql = 'insert into test1(name,password) value(%s,%s);'
cursor.execute(sql,['yy','666'])
conn.commit()
cursor.close()
conn.cursor()

import  pymysql
conn = pymysql.connect(
    host="10.0.0.87",
    user="test",
    password="123456",
    database="db10",
    charset="utf8")

# 游标
cursor = conn.cursor()
sql = 'insert into test1(name,password) value(%s,%s);'
cursor.executemany(sql,[("y1",'1'),("y2",'2'),("y3",'3'),("y4",'4')])
conn.commit()
cursor.close()
conn.cursor()

3. 查询

import  pymysql
conn = pymysql.connect(
    host="10.0.0.87",
    user="test",
    password="123456",
    database="db10",
    charset="utf8")

# cursor = conn.cursor(cursor=pymysql.cursors.DictCursor)
cursor = conn.cursor()
sql='select * from test1;'
rows=cursor.execute(sql)


# cursor.scroll(3,mode='absolute') # 相对绝对位置移动
# cursor.scroll(3,mode='relative') # 相对当前位置移动

#res1=cursor.fetchone()
# res3=cursor.fetchone()
# res4=cursor.fetchmany(2)
res5=cursor.fetchall()

print(res5)


cursor.close()
conn.close()