python 连接数据库操作

import mysql
 
#打开数据库连接(用户名，密码,数据库名)
db = mysql.connect("localhost","testuser","test123","testdb")
 
#使用cursor（）方法获取游标操作
cursor = db.cursor()
 
#使用exectue()执行sql语句操作
cursor.excetue("select name from tmp where sex = "男")

#使用fetchone（）方法获得一条数据
data = fetcone()
print data
db.close()

python 连接创建数据库表

db = connect("host","testuser","passwd","testdb")#连接数据库
 
cursor = db.cursor()#连接游标
 
sql = """crate table employee(
 
FIRST_NAME CHAR(20) NOT NULL,
 
LAST_NAME CHAR(20),
 
AGE IN,
 
SEX CHAR(1),
 
INCOME FLOAT)""" 
 
cursor.execute(sql)#执行SQL语句
 
db.close()# 关闭数据库连接

python 数据库插入操作

import mysql
 
db = mysql.connect("host","testuser","passwd","testdb"）#连接数据库
 
cursor = db.cursor()#获取游标
 
sql = """
insert into EMPLOYEE (FIRST_NAME,LAST_NAME,AGE,SEX,INCOME)
VALUES("MAC","Mohan",20,"M",20000)
"""
try:
　　cursor.exceute(sql)#提行SQL语句
　　db.commit()
except:
　　db.rollback()#发生错误回滚
 
db.close()#关闭数据库连接

数据库查询操作

import mysql
db = connect("host","testuser","passwd","testdb")
cursor = db.cursor()
#查询工资大于1000的员工信息
sql = "select * from employee where sal>%d"%(1000)
try:
    cursor.exceute(sql)#执行SQL语句
 
    results = cursor.fetchall#获取所有列表记录
    from row in results:
        fname = row[0]
        lname = row[1]
        age = row[2]
        sex = row[2]
       ncome = rowp[4]
 
    print "fname = %s,lname = %s",age= %d,income = %d"\
    %(fname,lname,age,sex,income)
except:
    print "Error:unable to facth data"
db.close()

数据库更新操作

import mysql
 
db = connect ("host","testuser","passwd","testdb")#数据库连接
surosr = db.cursor()#连接游标
sql = "UPDATE EMPLOYEE" SET AGE = AGE +1 WHERE SEX = "%C"%(M)
 
try:
　　sursor.execute(sql)#执行数据库操作
　　db.commit()
except:
　　db.rolloback()#发生错误时回滚
db.close()#关闭数据库连接

删除除操作

import MYSQLdb
 
db = connect("host","testuser","passwd","testdb")
cursor = db.cursor()#连接游标
sql = "DELETE FROM EMPLOYEE WHERE AGE >20"#删除年龄大于20岁的员工信息
 
try:
　　cursor.execute(sql)#执行SQL语句
　　db.commit()
except:
　　db.rollback()#发生错误时回滚
 
db.close()