Python操作MYSQL数据库

import MySQLdb
# connect
db = MySQLdb.connect(host="localhost", user="joe", passwd="secret",db="db56a")
# create a cursor
cursor = db.cursor()
# execute SQL statement
cursor.execute("SELECT * FROM animals")

# One By One
# get the number of rows in the resultset
numrows = int(cursor.rowcount)

# get and display one row at a time
for x in range(0,numrows):
row = cursor.fetchone()
print row[0], "-->", row[1]

 

# limit the resultset to 3 items
result = cursor.fetchmany(3)
# iterate through resultset
for record in result:
print record[0] , "-->", record[1]

 

# get the resultset as a tuple
result = cursor.fetchall()
# iterate through resultset
for record in result:
print record[0] , "-->", record[1]

 

# import MySQL module
import MySQLdb
# get user input
name = raw_input("Please enter a name: ")
species = raw_input("Please enter a species: ")
# connect
db = MySQLdb.connect(host="localhost", user="joe", passwd="secret",db="db56a")
# create a cursor
cursor = db.cursor()
# execute SQL statement
cursor.execute("INSERT INTO animals (name, species) VALUES (%s, %s)",(name, species))

 

# import MySQL module
import MySQLdb
# connect
db = MySQLdb.connect(host="localhost", user="joe", passwd="secret",db="db56a")
# create a cursor
cursor = db.cursor()
# execute SQL statement
cursor.execute("""INSERT INTO test (field1, field2) VALUES ("val1","val2")""")
# get ID of last inserted record
print "ID of inserted record is ", int(cursor.insert_id())

# import MySQL module
import MySQLdb
# connect
db = MySQLdb.connect(host="localhost", user="joe", passwd="secret",db="db56a")
# create a cursor
cursor = db.cursor()
# dynamically generate SQL statements from  list
cursor.executemany("INSERT INTO animals (name, species) VALUES (%s,%s)", [('Rollo', 'Rat'),  ('Dudley', 'Dolphin'),  ('Mark', 'Marmoset')])

 

# import MySQL module
import MySQLdb
# initialize some variables
name = ""
data = []
# loop and ask for user input
while (1):
name = raw_input("Please enter a name (EOF to end): ")
if name == "EOF":
break
species = raw_input("Please enter a species: ")
# put user input into a tuple
tuple = (name, species)
# and append to data[] list
data.append(tuple)
# connect
db = MySQLdb.connect(host="localhost", user="joe", passwd="secret",db="db56a")
# create a cursor
cursor = db.cursor()
# dynamically generate SQL statements from data[] list
cursor.executemany("INSERT INTO animals (name, species) VALUES (%s,%s)",data)


cursor用来接收返回值的方法:
fetchall(self):接收全部的返回结果行.
fetchmany(self, size=None):接收size条返回结果行.如果size的值大于返回的结果行的数量,则会返回cursor.arraysize条数据.
fetchone(self):返回一条结果行.
scroll(self, value, mode='relative'):移动指针到某一行.如果mode='relative',则表示从当前所在行移动value条,如果mode='absolute',则表示从结果集的第一行移动value条.

如果是要进行登录之类的判断的话就取fetchone即可。
实现fetchmany 这样的就可以实现r返回size条数目！