mysql005--mysql与python交互

一、安装相关包

       ubuntu下安装命令： sudo apt-get install python-mysqldb

       pycharm安装依赖包：

       

二、代码示例

测试表的结构:

#encoding=utf-8
import pymysql
#Python与mysql数据库的交互

class MySQLUtil(object):
    """连接MYSQL数据库并执行增、删、改、查操作"""
    __conn = None
    DB_NOT_CONNECT_MESSAGE="数据库连接出错，未能指向SQL[%s]";

    def __init__(self):
        self.conn = self.__conn

    @staticmethod
    def connToDB():
        """连接数据可"""
        try:
            print("尝试连接数据库")
            if not MySQLUtil.__conn:
                MySQLUtil.__conn = pymysql.connect(host='192.168.199.138',port=3306,
                                   db='test',user='root',password='123456',
                                   charset='utf8')
        except Exception as e:
            print(e.message)

    @staticmethod
    def close():
        """关闭数据库连接"""
        if MySQLUtil.__conn:
            MySQLUtil.__conn.close()

    def selectOne(self,sql):
        """查询一条记录"""
        if self.conn:
            cur = self.conn.cursor()
            cur.execute(sql)
            result=cur.fetchone()
            print(result)
            cur.close()
        else:
            print(self.DB_NOT_CONNECT_MESSAGE%sql)

    def selectMul(self,sql):
        """查询多条记录"""
        if self.conn:
            cur = self.conn.cursor()
            cur.execute(sql)
            result = cur.fetchall()
            print(result)
            cur.close()
        else:
            print(self.DB_NOT_CONNECT_MESSAGE% sql)

    def update(self,update):
        """执行更新或者插入语句"""
        if self.conn:
            cur = self.conn.cursor()
            count = cur.execute(sql)
            print("或者插入%d条数据"%count)
            if count>0:
                self.conn.commit()
            cur.close()
        else:
            print(self.DB_NOT_CONNECT_MESSAGE%sql)

    def delete(self,sql):
        """执行删除操作"""
        if self.conn:
            cur = self.conn.cursor()
            count = cur.execute(sql)
            print("删除%d条数据" % count)
            if count > 0:
                self.conn.commit()
            cur.close()

if __name__ == '__main__':
    """测试代码"""
    MySQLUtil.connToDB()   #python的类方法必须显示的调用，否则不会执行
    dbUtil = MySQLUtil()
    print("-------select one-------")
    sql = "select * from students"
    dbUtil.selectOne(sql)
    print("------select mutiple------")
    dbUtil.selectMul(sql)
    sql = "insert into students values(null,'小花',0,19),(null,'小Q',1,22)"
    print('-------update ----------')
    dbUtil.update(sql)
    print("------select mutiple------")
    sql = "select * from students"
    dbUtil.selectMul(sql)
    print('-----------delete----------')
    sql = "delete from students where name in('小花','小Q')"
    dbUtil.delete(sql)
    print("------select mutiple------")
    sql = "select * from students"
    dbUtil.selectMul(sql)
    print('--------close database connection-------')