Python连接MySQL，进行数据库表变更和查询：

python mysql insert delete query：

#!/usr/bin/python 
 
import MySQLdb 
def doInsert(cursor,db): 
 #insert 
 # Prepare SQL query to INSERT a record into the database. 
 sql = "UPDATE EMPLOYEE SET AGE = AGE+1 WHERE SEX = '%c'" %('M') 
 try: 
 cursor.execute(sql) 
 db.commit() 
 except: 
 db.rollback() 
 
def do_query(cursor,db): 
 sql = "SELECT * FROM EMPLOYEE \ 
 WHERE INCOME > '%d'" % (1000) 
 try: 
 # Execute the SQL command 
 cursor.execute(sql) 
 # Fetch all the rows in a list of lists. 
 results = cursor.fetchall() 
 print 'resuts',cursor.rowcount 
 for row in results: 
 fname = row[0] 
 lname = row[1] 
 age = row[2] 
 sex = row[3] 
 income = row[4] 
 # Now print fetched result 
 print "fname=%s,lname=%s,age=%d,sex=%s,income=%d" % \ 
 (fname, lname, age, sex, income ) 
 except: 
 print "Error: unable to fecth data" 
 
def do_delete(cursor,db): 
 sql = 'DELETE FROM EMPLOYEE WHERE AGE > {}'.format(20) 
 try: 
 cursor.execute(sql) 
 db.commit() 
 except: 
 db.rollback() 
 
def do_insert(cursor,db,firstname,lastname,age,sex,income): 
 sql = "INSERT INTO EMPLOYEE(FIRST_NAME, \ 
 LAST_NAME, AGE, SEX, INCOME) \ 
 VALUES ('%s', '%s', '%d', '%c', '%d' )" % \ 
 (firstname,lastname,age,sex,income) 
 try: 
 cursor.execute(sql) 
 db.commit() 
 except: 
 db.rollback() 
 
# Open database connection 
# change this to your mysql account 
#connect(server,username,password,db_name) 
db = MySQLdb.connect("localhost","root","root","pydb" ) 
# prepare a cursor object using cursor() method 
cursor = db.cursor() 
do_query(cursor,db) 
doInsert(cursor,db) 
do_query(cursor,db) 
do_delete(cursor,db) 
do_query(cursor,db) 
do_insert(cursor,db,'hunter','xue',22,'M',2000) 
do_insert(cursor,db,'mary','yang',22,'f',5555) 
do_insert(cursor,db,'zhang','xue',32,'M',5000) 
do_insert(cursor,db,'hunter','xue',22,'M',333) 
do_query(cursor,db) 
# disconnect from server 
db.close()

之后可以在此基础上根据需要进行封装。