python操作mysql数据库
python操作mysql需要用到MySQLdb这个库。1.下载MySQLdb,点击这里下载(可能被墙请自带梯子)
2.使用
import MySQLdbtry: con = MySQLdb.connect(host='192.168.1.100', user='myuser', passwd='123456', port='3306', db='mydb',charset='utf8') c = con.cursor() c.execute('select * from user'); rows=c.fetchall() #一次读取所有数据,返回的数据结构[(?,?,...),(?,?,..),..] for row in rows: for column in row: print columnexcept Exception,e: print efinally: c.close() con.close()
import MySQLdbtry: con = MySQLdb.connect(host='192.168.1.100', user='myuser', passwd='123456', port='3306', db='mydb',charset='utf8') c = con.cursor() #使用占位符传递参数,参数是一个tuple c.execute('select * from user where user=%s',('root')); rows=c.fetchall() #一次读取所有数据,返回的数据结构[(?,?,...),(?,?,..),..] for row in rows: for column in row: print columnexcept Exception,e: print efinally: c.close() con.close()
import MySQLdbtry: con = MySQLdb.connect(host='192.168.1.100', user='myuser', passwd='123456', port='3306', db='mydb',charset='utf8') c = con.cursor() #使用占位符传递参数,参数是一个tuple c.execute('update user set host=%s where user=%s',('root','192.168.1.200')); con.commit() #更新操作记得提交事物,否则更改不会生效except Exception,e: print efinally: c.close() con.close()
import MySQLdbtry: con = MySQLdb.connect(host='192.168.1.100', user='myuser', passwd='123456', port='3306', db='mydb',charset='utf8') c = con.cursor() vs=[] vs.append(('root','192.168.1.100')) vs.append(('db','192.168.1.101')) vs.append(('pdb','192.168.1.101')) #使用占位符传递参数,参数是一个list tuple c.executemany('insert into user(user,host)values(%s,%s)',vs); con.commit() #更新操作记得提交事物,否则更改不会生效except Exception,e: print efinally: c.close() con.close() 3.注意事项
咋看一下其中占位符和字符串格式化差不多,天真的以为数字用%d,浮点数用%f,字符串用%s,那你可以就要悲剧了
事实上这里的占位符只能是%s
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