[root@pku-fan MySQL]# cat limbs.sql
CREATE DATABASE cookbook;
USE cookbook;
DROP TABLE IF EXISTS limbs;
CREATE TABLE limbs
(
thing VARCHAR(20), # what the thing is
legs INT, # number of legs it has
arms INT # number of arms it has
);
INSERT INTO limbs (thing,legs,arms) VALUES('human',2,2);
INSERT INTO limbs (thing,legs,arms) VALUES('insect',6,0);
INSERT INTO limbs (thing,legs,arms) VALUES('squid',0,10);
INSERT INTO limbs (thing,legs,arms) VALUES('octopus',0,8);
INSERT INTO limbs (thing,legs,arms) VALUES('fish',0,0);
INSERT INTO limbs (thing,legs,arms) VALUES('centipede',100,0);
INSERT INTO limbs (thing,legs,arms) VALUES('table',4,0);
INSERT INTO limbs (thing,legs,arms) VALUES('armchair',4,2);
INSERT INTO limbs (thing,legs,arms) VALUES('phonograph',0,1);
INSERT INTO limbs (thing,legs,arms) VALUES('tripod',3,0);
INSERT INTO limbs (thing,legs,arms) VALUES('Peg Leg Pete',1,2);
INSERT INTO limbs (thing,legs,arms) VALUES('space alien',NULL,NULL);
[root@pku-fan MySQL]#mysql -u root -p < limbs.sql
编辑python程序
import MySQLdb
db_user = '不能说'
db_pw = '秘密'
db = MySQLdb.connect('localhost', db_user, db_pw, 'cookbook')
c = db.cursor()
c.execute("select * from limbs")
print "%17s\t%7s\t%7s" % ('thing','legs','arms')
for thing,legs,arms in c.fetchall():
print "%17s\t%7s\t%7s" %(thing,legs,arms)
1. 简介
在Web应用程序体系架构中，数据持久层（通常是一个关系数据库）是关键的核心部分，它对系统的性能有非常重要的影响。MySQL是目前使用最多的开源数据库，但是MySQL数据库的默认设置性能非常的差，仅仅是一个玩具数据库。因此在产品中使用MySQL数据库必须进行必要的优化。
优化是一个复杂的任务，本文描述MySQL� ......
1.reverse(str)函数: 返回颠倒字符顺序的字符串str, 该函数对多字节可靠的.
mysql> select * from user;
+----+------------------+
| id | name |
+----+------------------+
| 1 | test &nbs ......
