Python操作MySQL資料庫

import mysql.connector

con=mysql.connector.connect(
host=
"localhost"
,port=
"3306"
, user=
"root"
,password=
"password"
, database=
"demo"
)

import mysql.connector

config=
con=mysql.connector.connect(
**config)

import mysql.connector

con=mysql.connector.connect(
host=
"localhost"
,port=
"3306"
, user=
"root"
,password=
"password"
, database=
"demo"
)cursor=con.cursor(
)sql=
"select empno,job,sal from t_bonus;"
cursor.execute(sql)
print
(type
(cursor)
)for i in cursor:
print
(i)con.close(
)result:
<
class
'mysql.connector.cursor_cext.cmysqlcursor'
>
(7369
,'clerk'
, decimal(
'8000.00'))
(7499
,'salesman'
, decimal(
'1600.00'))
(7521
,'salesman'
, decimal(
'1250.00'))
(7566
,'manager'
, decimal(
'2975.00'))
(7654
,'salesman'
, decimal(
'1250.00'))
(7698
,'manager'
, decimal(
'2850.00'))
(7782
,'manager'
, decimal(
'2450.00'))
(7788
,'analyst'
, decimal(
'3000.00'))
(7839
,'president'
, decimal(
'5000.00'))
(7844
,'salesman'
, decimal(
'1500.00'))
(7900
,'clerk'
, decimal(
'950.00'))
(7902
,'analyst'
, decimal(
'3000.00'))
(7934
,'clerk'
, decimal(
'1300.00'
))

在使用字串直接拼接時or之前不管對錯，與or結合都為true

解決方法——預編譯（也可以提高速度）

username=

"1 or 1=1"
password=
"1 or 1=1"
sql=
"select count(*) from t_user where username=%s and aes_decrypt(unhex(password),'helloworld')=%s"
cursor.execute(sql,
(username,password)
)print
(cursor.fetchone()[
0])

import mysql.connector

try:
con=mysql.connector.connect(
host=
"localhost"
,port=
"3306"
, user=
"root"
,password=
"password"
, database=
"demo"
) con.start_transaction(
) cursor=con.cursor(
) sql=
"insert into t_dept(deptno,dname,loc) values(%s,%s,%s);"
cursor.execute(sql,(60
,"sales"
,"hubai"))
con.commit(
)except exception as e:
if"con"
indir()
: con.rollback(
)print
(e)finally:if
"con"
indir()
: con.close(
)

import mysql.connector,mysql.connector.pooling

config=
try:
pool=mysql.connector.pooling.mysqlconnectionpool(
**config,pool_size=5)
con=pool.get_connection(
) con.start_transaction(
) cursor = con.cursor(
) sql =
"delete from t_dept where deptno=%s"
cursor.execute(sql,(70
,)) con.commit(
)except exception as e:
if"con"
indir()
: con.rollback(
)print
(e)# do not need to close con

import mysql.connector,mysql.connector.pooling

config=
try:
pool=mysql.connector.pooling.mysqlconnectionpool(
**config,pool_size=5)
con=pool.get_connection(
) con.start_transaction(
) cursor = con.cursor(
) sql =
"insert into t_dept(deptno,dname,loc) values(%s,%s,%s);"
date=[[
70,"sales"
,"beijing"],
[80,"actor"
,"shanghai"]]
cursor.executemany(sql, date)
con.commit(
)except exception as e:
if"con"
indir()
: con.rollback(
)print
(e)# do not need to close con

資料庫連線池技術就是先建立好連線，再直接拿出來使用

import mysql.connector,mysql.connector.pooling

config=
try:
pool=mysql.connector.pooling.mysqlconnectionpool(
**config,pool_size=5)
con=pool.get_connection(
) con.start_transaction(
) cursor = con.cursor(
) sql =
"insert into t_dept(deptno,dname,loc) values(%s,%s,%s);"
cursor.execute(sql,(70
,"sales"
,"hubai"))
con.commit(
)except exception as e:
if"con"
indir()
: con.rollback(
)print
(e)# do not need to close con

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