python2操作MySQL

#coding=utf-8

 

import MySQLdb

 

conn = MySQLdb.connect(host='localhost',user='root',passwd='123456',charset='utf8')

cursor = conn.cursor()

try:

    #创建数据库

    DB_NAME = 'test'

    cursor.execute('DROP DATABASE IF EXISTS %s' %DB_NAME)

    cursor.execute('CREATE DATABASE IF NOT EXISTS %s' %DB_NAME)

    conn.select_db(DB_NAME)

 

    #创建表

    TABLE_NAME = 't_user'

    cursor.execute('CREATE TABLE %s(id int primary key,name varchar(30))' %TABLE_NAME)

 

    #插入单条数据

    value = [1,'alexzhou1']

    cursor.execute('INSERT INTO t_user values(%s,%s)',value)

 

    #批量插入数据

    values = []

    for i in range(2,10):

        values.append((i,'alexzhou%s' %(str(i))))

    cursor.executemany('INSERT INTO t_user values(%s,%s)',values)

 

    #查询记录数量

    count = cursor.execute('SELECT * FROM %s' %TABLE_NAME)

    print 'total records: %d',count

 

    #查询一条记录

    print 'fetch one record:'

    result = cursor.fetchone()

    print result

    print 'id: %s,name: %s' %(result[0],result[1])

 

    #查询多条记录

    print 'fetch five record:'

    results = cursor.fetchmany(5)

    for r in results:

        print r

 

    #查询所有记录

    #重置游标位置，偏移量:大于0向后移动;小于0向前移动，mode默认是relative

    #relative:表示从当前所在的行开始移动,absolute:表示从第一行开始移动

    cursor.scroll(0,mode='absolute')

    results = cursor.fetchall()

    for r in results:

        print r

 

    cursor.scroll(-2)

    results = cursor.fetchall()

    for r in results:

        print r

 

    #更新记录

    cursor.execute('UPDATE %s SET name = "%s" WHERE id = %s' %(TABLE_NAME,'zhoujianghai',1))

    #删除记录

    cursor.execute('DELETE FROM %s WHERE id = %s' %(TABLE_NAME,2))

 

    #必须提交，否则不会插入数据

    conn.commit()

except:

    import traceback

    traceback.print_exc()

    conn.rollback()

finally:

    cursor.close()

    conn.close()

 

 

 

版权属于: Alex's Blog

原文地址: http://codingnow.cn/language/444.html