mysql的简单操作，包括php操作和python操作

php版

<?php 
/*
	Model
	对数据进行操作  
 */
//数据库相关配置
// define('HOST','127.0.0.1');
define('USER','root');
define('PASS','1234@Hao');
define('DBNAME','txt');
define('CHARSET','utf8');

class Model{
        //成员属性
        public $link;//数据库链接标识
        public $tableName;//表名
        public $pk;//主键
        public $fields;//字段
        public $where;//where条件
        public $limit;//limit条件
        public $order;//order条件
        public $field;//字段条件


        //构造方法
        public function __construct($tableName,$host = '127.0.0.1')
        {
                //初始化
                $this->tableName = $tableName;
                //链接数据库
                $this->link = mysqli_connect($host,USER,PASS) or die('数据库链接失败');
                // $this->link = mysqli_connect(HOST,USER,PASS) or die('数据库链接失败');
                // 选择库
                mysqli_select_db($this->link,DBNAME) or die('选择数据库失败');
                //设置字符集
                mysqli_set_charset($this->link,CHARSET) or die('设置字符集失败');
                //调用方法 获取表中字段
                $this->getTableFields();
        }

        public function query($sql,$resultType = MYSQLI_BOTH)
        {
                //保存SQL语句
                $this->sql = $sql;
                //每次执行完SQL语句都要初始化条件
                // $this->options = $this->initOptions();
                $result = mysqli_query($this->link,$sql);
                // $result = mysql_query($sql,$this->link);
                if($result){
                        if($result === false || $result === true){
                                return $result;
                        }
                        return mysqli_fetch_all($result,$resultType);
                }
                return $result;
        }

        //获取当前表中的所有字段信息  desc user
        public function getTableFields()
        {
                //拼接sql
                $sql = 'desc '.$this->tableName;
                //执行sql
                $res = mysqli_query($this->link,$sql);
                //声明变量和数组
                $pk = '';//主键
                $arr = [];//普通字段
                //判断 提取结果
                if($res){
                        while($row = mysqli_fetch_assoc($res))
                        {
                                //判断是否为主键
                                if($row['Key'] == 'PRI'){
                                        $pk = $row['Field'];
                                }else{
                                        $arr[] = $row['Field'];
                                }
                        }
                        //将字段和主键存入属性中
                        $this->pk = $pk;
                        $this->fields = $arr;
                }else{
                        return false;
                }

        }

        //析构方法
        public function __destruct()
        {
                //关闭数据库
                mysqli_close($this->link);
        }

}
?>

python异步版

使用twist库完成异步操作

# -*- coding: utf-8 -*-
from mininova.settings import settings
from twisted.enterprise import adbapi
import pymysql
import pymysql.cursors
from scrapy import log
class Bookdb():
    def __init__(self):
        dbparams = dict(
            host=settings['mysql_host'], 
            db=settings['mysql_db'],
            user=settings['mysql_user'],
            passwd=settings['mysql_password'],
            charset=settings['mysql_charset'],  
            cursorclass=pymysql.cursors.DictCursor,
            use_unicode=False,
        )
        dbpool = adbapi.ConnectionPool('pymysql', **dbparams)
        self.dbpool = dbpool

    def insert(self, item):
        chapter_table = int(item['book_id'])%100 + 1
        sql = "insert into chapter_"+str(chapter_table)+"(book_id,chp_name,sort,chp_url,chp_script_url) values(%s,%s,%s,%s,'')"
        query = self.dbpool.runInteraction(self._conditional_insert, sql, item)
        query.addErrback(self._handle_error)
        return item

    def _conditional_insert(self, tx, sql, item):
        chapter_table =int(item['book_id'])%100 + 1
        params = (item['book_id'],item['chp_name'], item['chp_sort'],item['url'])
        exist_sql = "select id from chapter_"+str(chapter_table)+" where book_id = %s and chp_name = %s and sort= %s and chp_url = %s"
        exist = tx.execute(exist_sql, params)
        # print(exist)
        if exist == 0:
            res = tx.execute(sql, params)
            log.msg("Item not stored in db:\n%s" % item,level=log.DEBUG)
        else:
            log.msg("Item already stored in db:\n%s" % item,level=log.DEBUG)
    def update(self,item):
        print('book_id :'+str(item['book_id']))
        chapter_table =int(item['book_id'])%100 + 1
        sql = "update chapter_"+str(chapter_table)+" set chp_script_url = %s where book_id = %s and sort= %s"
        query = self.dbpool.runInteraction(self._conditional_update, sql, item)
        query.addErrback(self._handle_error)
        return item

    def _conditional_update(self, tx, sql, item):
        chapter_table =int(item['book_id'])%100 + 1
        print('_conditional_update')
        print(sql)
        params = (item['chp_script_url'], item['book_id'], item['chp_sort'])
        print(params)
        res = tx.execute(sql,params)
        params1 = (item['book_id'], item['chp_sort'])
        print(params1)
        sql = "select * from chapter_"+str(chapter_table)+" where book_id = %s and sort= %s"
        result = tx.execute(sql,params1)
        result = tx.fetchall()
        log.msg("Item updated in db:\n%s" % item,level=log.DEBUG)
        log.msg("Item result in db:\n%s" % result,level=log.DEBUG)
        log.msg("Item affect rows in db:%s" % res,level=log.DEBUG)


    def _handle_error(self, failue):
        print('--------------database operation exception!!-----------------')
        print(failue)