python连接mysql数据库示例(做增删改操作)

#encoding=utf-8
'''
Created on 2012-11-12

Mysql Conn连接类
'''

import MySQLdb

class DBConn:

    conn = None

    #建立和数据库系统的连接
    def connect(self):
        self.conn = MySQLdb.connect(host="localhost",port=3306,user="house",passwd="house",db="house",charset="utf8")

    #获取操作游标
    def cursor(self):
        try:
            return self.conn.cursor()
        except (AttributeError,MySQLdb.OperationalError):
            self.connect()
            return self.conn.cursor()

    def commit(self):
        return self.conn.commit()

    #关闭连接
    def close(self):
        return self.conn.close()

#encoding=utf-8
'''
Created on 2012-11-12

@author: Steven

Mysql操作Demo
Done:创建表，删除表，数据增、删、改，批量插入
'''
import MysqlDBConn

dbconn = MysqlDBConn.DBConn()

def process():
    #建立连接
    dbconn.connect()
    #删除表
    dropTable()
    #创建表
    createTable()
    #批量插入数据
    insertDatas()
    #单条插入
    insertData()
    #更新数据
    updateData()
    #删除数据
    deleteData()
    #查询数据
    queryData()
    #释放连接
    dbconn.close()

def insertDatas():
    sql = "insert into lifeba_users(name,realname,age) values(%s,%s,%s)"
    tmp = (('steven1','测试1',26),('steven2','测试2',25))
    executemany(sql,tmp)

def updateData():
    sql = "update lifeba_users set realname = '%s' where name ='steven1'"%("测试1修改")
    execute(sql)

def deleteData():
    sql = "delete from lifeba_users where id=2"
    execute(sql)

def queryData():
    sql = "select * from lifeba_users"
    rows = query(sql)
    printResult(rows)

def insertData():
    sql = "insert into lifeba_users(name,age) values('%s','%s',%s)"%("steven3","测试3","26")
    print sql
    execute(sql)

def executemany(sql,tmp):
    '''插入多条数据'''
    conn=dbconn.cursor()
    conn.executemany(sql,tmp)

def execute(sql):
    '''执行sql'''
    conn=dbconn.cursor()
    conn.execute(sql)

def query(sql):
    '''查询sql'''
    conn=dbconn.cursor()
    conn.execute(sql)
    rows = conn.fetchmany(10)
    return rows

def createTable():
    '''创建表'''
    conn=dbconn.cursor()
    conn.execute('''
    CREATE TABLE `lifeba_users` (
      `ID` int(11) NOT NULL auto_increment,
      `name` varchar(50) default NULL,
      `realName` varchar(50) default NULL,
      `age` int(11) default NULL,
      PRIMARY KEY  (`ID`)
    ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
    ''')
#    dbconn.commit()

def dropTable():
    '''删除表'''
    conn=dbconn.cursor()
    conn.execute('''
    DROP TABLE IF EXISTS `lifeba_users`
    ''')
#    dbconn.commit()

def printResult(rows):
    for row in rows:
        for i in range(0,len(row)):#遍历数组
            print row[i],#加,不换行打印
        print ''

if __name__ == '__main__':

    process()