用Python开发MySQL脚本_python脚本开发_python 使用mysql

复杂的数据库操作

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#animal.py：创建动物表并从中检索信息

import sys

import MySQLdb

#连接到MySQL服务器

try:

conn = MySQLdb.connect (host = “localhost”,

user = “testuser”,

passwd = “testpass”,

db = “test”)

except MySQLdb.Error, e:

print “Error %d: %s” % (e.args[0], e.args[1])

sys.exit (1)

#创建动物表并填充内容

try:

cursor = conn.cursor ()

cursor.execute (“DROP TABLE IF EXISTS animal”)

cursor.execute (“””

CREATE TABLE animal

(

name CHAR(40),

category CHAR(40)

)

“””)

cursor.execute (“””

INSERT INTO animal (name, category)

VALUES

(‘snake’, ‘reptile’),

(‘frog’, ‘amphibian’),

(‘tuna’, ‘fish’),

(‘racoon’, ‘mammal’)

“””)

print “Number of rows inserted: %d” % cursor.rowcount

#使用fetchone()进行循环提取

cursor.execute (“SELECT name, category FROM animal”)

while (1):

row = cursor.fetchone ()

if row == None:

break

print “%s, %s” % (row[0], row[1])

print “Number of rows returned: %d” % cursor.rowcount

#使用fetchall()进行循环提取

cursor.execute (“SELECT name, category FROM animal”)

rows = cursor.fetchall ()

for row in rows:

print “%s, %s” % (row[0], row[1])

print “Number of rows returned: %d” % cursor.rowcount

#发出修改名称的语句，共两种方式，第一种是在语句字符串

#中使用数据值的字面值，第二种是使用位置标识符

cursor.execute (“””

UPDATE animal SET name = ‘turtle’

WHERE name = ‘snake’

“””)

print “Number of rows updated: %d” % cursor.rowcount

cursor.execute (“””

UPDATE animal SET name = %s

WHERE name = %s

“””, (“snake”, “turtle”))

print “Number of rows updated: %d” % cursor.rowcount

#创建一个字典游标，这样就可以使用位置而非名称来访问数据列中的值了。

cursor.close ()

cursor = conn.cursor (MySQLdb.cursors.DictCursor)

cursor.execute (“SELECT name, category FROM animal”)

result_set = cursor.fetchall ()

for row in result_set:

print “%s, %s” % (row[“name”], row[“category”])

print “Number of rows returned: %d” % cursor.rowcount

cursor.close ()

except MySQLdb.Error, e:

print “Error %d: %s” % (e.args[0], e.args[1])

sys.exit (1)

conn.commit ()

conn.close ()