mysql学习（4）python操作数据库

整理了一下前面3期学的内容后，现在练习使用python去操作数据库

#!python3
# coding:utf-8
import pymysql
class mysql_option():
    def __init__(self, host, port, username, pwd, **kwargs):
        '''
        如果直接连接到具体的数据库，只需要传kwargs，即db = dbname
        :param host:
        :param port:
        :param username:
        :param pwd:
        :param kwargs:
        :return:
        '''
        self.conn = self.mysql_connect(host, port, username, pwd, **kwargs)
        self.cursor = self.conn.cursor()

    @staticmethod
    def mysql_connect(host, port, username, pwd, **kwargs):
        try:
            connect = pymysql.connect(host = host, port = int(port), user = username, passwd = pwd, charset = 'utf8', **kwargs)
            print("Mysql数据库连接成功")
            return connect
        except Exception as ex:
            print("Mysql连接异常,具体报错如下：
%s"%(ex))
            return False


    def create_database(self, dbname):
        '''
        创建数据库
        :param dbname: 数据库名称
        :return:
        '''
        try:
            create_db_sql = "create database if not exists %s default character set utf8 collate utf_8_general_ci;"%(dbname)
            self.cursor.execute(create_db_sql)
            result = self.cursor.fetcall()
            print("创建%s数据库成功%s"%(dbname, result))
        except Exception as ex:
            print("创建%s数据库失败，具体原因如下：
%s"%(dbname, ex))
            self.cursor.close()
            return False

    def select_db(self, db_name):
        try:
            self.conn.select_db(db_name)
            print("连接数据库%s成功"%(db_name))
        except Exception as ex:
            print("连接数据库%s失败,具体原因如下：
%s"%(db_name, ex))
            self.cursor.close()
            return False

    def create_table(self, table_name):
        create_table_sql = "create table if not exists %s"%(table_name)
        try:
            self.cursor.execute(create_table_sql)
            result = self.cursor.fetcall()
            print("创建%s数据表成功%s"%(table_name, result))
            return True
        except Exception as ex:
            print("创建%s数据表失败,具体原因如下：
%s"%(table_name, ex))
            self.cursor.close()
            return False

    def sql_option(self, option):
        try:
            self.cursor.execute(option)
        except Exception as ex:
            print("操作语句执行失败,具体原因如下：
%s"%(ex))
            self.conn.rollback()   #事务回滚
            return False
        else:
            self.conn.commit()
            print("SQL事物提交成功，提交结果：%s"%(self.cursor.rowcount))
            return True
        finally:
            self.cursor.close()    #关闭连接

    def show_db(self):
        self.cursor.execute("show databases;")
        result = self.cursor.fetchall()
        return result

    def show_table(self):
        self.cursor.execute("show tables;")
        result = self.cursor.fetchall()
        return result

    def show_desc(self, table_name):
        sql_op = "desc %s"%(table_name)
        self.cursor.execute(sql_op)
        result = self.cursor.fetchall()
        return result

    def drop_db(self, db_name):
        sql_op = "drop database %s"%(db_name)
        print("警告：您将删除数据库%s，请再次确认删除！(Y)确认 (N)取消"%(db_name))
        confirm = input("请选择：")
        if confirm == "Y" or confirm == "y":
            try:
                print("开始删除……")
                self.cursor.execute(sql_op)
                print("删除数据库%s成功"%(db_name))
                return True
            except Exception as ex:
                print("删除数据库%s失败，具体原因：%s"%(db_name, ex))
                return False
            finally:
                self.cursor.close()
        else:
            print("本次操作已取消！")
            return False

    def drop_table(self, table_name):
        sql_op = "drop table %s"%(table_name)
        print("警告：您将删除数据表%s，请再次确认删除！(Y)确认 (N)取消"%(table_name))
        confirm = input("请选择：")
        if confirm == "Y" or confirm == "y":
            print("开始删除……")
            try:
                self.cursor.execute(sql_op)
                print("删除数据表%s成功%s"%(table_name))
                return True
            except Exception as ex:
                print("删除数据表%s失败,具体原因：%s"%(table_name, ex))
                return False
            finally:
                self.cursor.close()    #关闭连接

        else:
            print("本次操作已取消！")

    def close_mysql(self):
        self.cursor.close()

if __name__ == '__main__':
    mysql_option = mysql_option("192.168.183.128", "3306", "root", "Abc123!", db = 'testdb')
    # mysql_option = mysql_option("192.168.183.128", "3306", "root", "Abc123!")
    # print(mysql_option.show_db()[4][0])
    # db = mysql_option.show_db()[4][0]
    # mysql_option.select_db(db)
    # # mysql_option.show_table()
    # # mysql_option.close_mysql()
    # print(mysql_option.show_desc("test_tables"))
    # mysql_option.drop_db("testdb02")
    SQL = "select *from  user where id=1"
    mysql_option.sql_option(SQL)