How to connect python to mysql

How to connect python to mysql? Here is a detailed introduction to how to use MySQLdb:

(1) What is MySQLdb?

MySQLdb is an interface for Python to connect to the MySQL database. It implements the Python database API specification V2.0 and is based on the MySQL C API.

(2) Install MySQLdb from source code: https://pypi.python.org/pypi/MySQL-python

$ tar zxvf MySQL-python-*.tar.gz $ cd MySQL-python-* $ python setup.py build $ python setup.py install

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(3) Use of MySQLdb:

#!/usr/bin/env python # coding=utf-8 import MySQLdb def connectdb(): print('连接到mysql服务器...') # 打开数据库连接 # 用户名:hp, 密码:Hp12345.,用户名和密码需要改成你自己的mysql用户名和密码，并且要创建数据库TESTDB， 并在TESTDB数据库中创建好表Student db = MySQLdb.connect("localhost","hp","Hp12345.","TESTDB") print('连接上了!') return db def createtable(db): # 使用cursor()方法获取操作游标 cursor = db.cursor() # 如果存在表Sutdent先删除 cursor.execute("DROP TABLE IF EXISTS Student") sql = """CREATE TABLE Student ( ID CHAR(10) NOT NULL, Name CHAR(8), Grade INT )""" # 创建Sutdent表 cursor.execute(sql) def insertdb(db): # 使用cursor()方法获取操作游标 cursor = db.cursor() # SQL 插入语句 sql = """INSERT INTO Student VALUES ('001', 'CZQ', 70), ('002', 'LHQ', 80), ('003', 'MQ', 90), ('004', 'WH', 80), ('005', 'HP', 70), ('006', 'YF', 66), ('007', 'TEST', 100)""" #sql = "INSERT INTO Student(ID, Name, Grade) \ # VALUES ('%s', '%s', '%d')" % \ # ('001', 'HP', 60) try: # 执行sql语句 cursor.execute(sql) # 提交到数据库执行 db.commit() except: # Rollback in case there is any error print '插入数据失败!' db.rollback() def querydb(db): # 使用cursor()方法获取操作游标 cursor = db.cursor() # SQL 查询语句 #sql = "SELECT * FROM Student \ # WHERE Grade > '%d'" % (80) sql = "SELECT * FROM Student" try: # 执行SQL语句 cursor.execute(sql) # 获取所有记录列表 results = cursor.fetchall() for row in results: ID = row[0] Name = row[1] Grade = row[2] # 打印结果 print "ID: %s, Name: %s, Grade: %d" % \ (ID, Name, Grade) except: print "Error: unable to fecth data" def deletedb(db): # 使用cursor()方法获取操作游标 cursor = db.cursor() # SQL 删除语句 sql = "DELETE FROM Student WHERE Grade = '%d'" % (100) try: # 执行SQL语句 cursor.execute(sql) # 提交修改 db.commit() except: print '删除数据失败!' # 发生错误时回滚 db.rollback() def updatedb(db): # 使用cursor()方法获取操作游标 cursor = db.cursor() # SQL 更新语句 sql = "UPDATE Student SET Grade = Grade + 3 WHERE ID = '%s'" % ('003') try: # 执行SQL语句 cursor.execute(sql) # 提交到数据库执行 db.commit() except: print '更新数据失败!' # 发生错误时回滚 db.rollback() def closedb(db): db.close() def main(): db = connectdb() # 连接MySQL数据库 createtable(db) # 创建表 insertdb(db) # 插入数据 print '\n插入数据后:' querydb(db) deletedb(db) # 删除数据 print '\n删除数据后:' querydb(db) updatedb(db) # 更新数据 print '\n更新数据后:' querydb(db) closedb(db) # 关闭数据库 if __name__ == '__main__': main()

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