Python操作MySQL数据库的示例代码

1. MySQL Connector

1.1 创建连接

import mysql.connector config={ 'host':'localhost','port':'3306', 'user':'root','password':'password', 'database':'demo' } con=mysql.connector.connect(**config) import mysql.connector config={ 'host':'localhost','port':'3306', 'user':'root','password':'password', 'database':'demo' } con=mysql.connector.connect(**config)

1.2 Cursor

import mysql.connector con=mysql.connector.connect( host='localhost',port='3306', user='root',password='password', database='demo' ) cursor=con.cursor() sql='SELECT empno,job,sal FROM t_bonus;' cursor.execute(sql) print(type(cursor)) for i in cursor: print(i) con.close() Result: <class ’mysql.connector.cursor_cext.CMySQLCursor’> (7369, ’CLERK’, Decimal(’8000.00’)) (7499, ’SALESMAN’, Decimal(’1600.00’)) (7521, ’SALESMAN’, Decimal(’1250.00’)) (7566, ’MANAGER’, Decimal(’2975.00’)) (7654, ’SALESMAN’, Decimal(’1250.00’)) (7698, ’MANAGER’, Decimal(’2850.00’)) (7782, ’MANAGER’, Decimal(’2450.00’)) (7788, ’ANALYST’, Decimal(’3000.00’)) (7839, ’PRESIDENT’, Decimal(’5000.00’)) (7844, ’SALESMAN’, Decimal(’1500.00’)) (7900, ’CLERK’, Decimal(’950.00’)) (7902, ’ANALYST’, Decimal(’3000.00’)) (7934, ’CLERK’, Decimal(’1300.00’))

1.3 SQL注入攻击

username=1 OR 1=1 password=1 OR 1=1 在使用字符串直接拼接时OR之前不管对错，与OR结合都为true 解决方法——预编译（也可以提高速度）

1.4 事务管理和异常处理

sql连接和使用异常处理异常

import mysql.connector try: con=mysql.connector.connect( host='localhost',port='3306', user='root',password='password', database='demo' ) con.start_transaction() cursor=con.cursor() sql='INSERT INTO t_dept(deptno,dname,loc) VALUES(%s,%s,%s);' cursor.execute(sql,(60,'SALES','HUBAI')) con.commit() except Exception as e: if 'con' in dir(): con.rollback() print(e) finally: if 'con' in dir(): con.close()

1.5 删除数据

import mysql.connector,mysql.connector.pooling config={ 'host': 'localhost', 'port': '3306', 'user': 'root', 'password': 'password', 'database': 'demo' } try: pool=mysql.connector.pooling.MySQLConnectionPool(**config,pool_size=5) con=pool.get_connection() con.start_transaction() cursor = con.cursor() sql = 'DELETE FROM t_dept WHERE deptno=%s' cursor.execute(sql, (70,)) con.commit() except Exception as e: if 'con' in dir(): con.rollback() print(e) # do not need to close con

executemany() 反复执行一条SQL语句

import mysql.connector,mysql.connector.pooling config={ 'host': 'localhost', 'port': '3306', 'user': 'root', 'password': 'password', 'database': 'demo' } try: pool=mysql.connector.pooling.MySQLConnectionPool(**config,pool_size=5) con=pool.get_connection() con.start_transaction() cursor = con.cursor() sql = 'INSERT INTO t_dept(deptno,dname,loc) VALUES(%s,%s,%s);' date=[[70,'SALES','BEIJING'],[80,'ACTOR','SHANGHAI']] cursor.executemany(sql, date) con.commit() except Exception as e: if 'con' in dir(): con.rollback() print(e) # do not need to close con

2. 数据库连接池

数据库的连接是昂贵的，一个连接要经过TCP三次握手，四次挥手，而且一台计算机的最大线程数也是有限的 数据库连接池技术就是先创建好连接，再直接拿出来使用

import mysql.connector,mysql.connector.pooling config={ 'host': 'localhost', 'port': '3306', 'user': 'root', 'password': 'password', 'database': 'demo' } try: pool=mysql.connector.pooling.MySQLConnectionPool(**config,pool_size=5) con=pool.get_connection() con.start_transaction() cursor = con.cursor() sql = 'INSERT INTO t_dept(deptno,dname,loc) VALUES(%s,%s,%s);' cursor.execute(sql, (70, 'SALES', 'HUBAI')) con.commit() except Exception as e: if 'con' in dir(): con.rollback() print(e) # do not need to close con

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