Python implémente l'encapsulation des classes d'opérations de base MySQLdb-Tutoriel Python-php.cn

Python implémente l'encapsulation des classes d'opérations de base MySQLdb

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Libérer： 2018-04-08 09:40:13

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Cet article présente principalement la classe d'opérations de base pour encapsuler MySQLdb en Python. L'éditeur pense que c'est assez bon, je vais donc le partager avec vous maintenant et le donner comme référence. Venez jeter un oeil avec la rédaction

# -*- coding:utf-8 -*-
import MySQLdb
import datetime
import sys
reload(sys)
sys.setdefaultencoding(&#39;utf-8&#39;)

#封装MySQLdb类基本操作mysqldb


class mysqldb:
        conn = &#39;&#39;
        cursor = &#39;&#39;
        def __init__(self,host1=&#39;localhost&#39;,user1=&#39;root&#39;,passwd1=&#39;www&#39;,database1=&#39;test&#39;,charset1=&#39;utf8&#39;):
           try:          
             print &#39;init_ ok&#39;
                self.conn=MySQLdb.connect(host=host1,user=user1,passwd=passwd1,db=database1,port=3306,charset=charset1);
                self.cursor = self.conn.cursor(MySQLdb.cursors.DictCursor)            
            except MySQLdb.Error,e:
                error = &#39;Connect failed! ERROR (%s): %s&#39; %(e.args[0],e.args[1])               
                     print error
                     sys.exit()        
        #针对读操作返回结果集
        def _exeCute(self,sql=&#39;&#39;):
            try:
                self.cursor.execute(sql)
                records = self.cursor.fetchall()                
                return records            
            except MySQLdb.Error,e:
                error = &#39;MySQL execute failed! ERROR (%s): %s&#39; %(e.args[0],e.args[1])              
                      print error                    
                      #sys.exit()
        #针对更新,删除,事务等操作失败时回滚
        def _exeCuteCommit(self,sql=&#39;&#39;):
            try:
                self.cursor = self.conn.cursor()
            self.cursor.execute(sql)
                self.conn.commit()            
            except MySQLdb.Error,e:
                self.conn.rollback()
                error = &#39;MySQL execute failed! ERROR (%s): %s&#39; %(e.args[0],e.args[1])               
                     print error                    
                     #sys.exit()
        #创建表        
        #tablename:表名称,attr_dict:属性键值对,constraint:主外键约束
        #attr_dict:{&#39;book_name&#39;:&#39;varchar(200) NOT NULL&#39;...}
        #constraint:PRIMARY KEY(`id`)
        def _createTable(self,table,attr_dict,constraint):
            sql = &#39;&#39;
            sql_mid = &#39;`id` bigint(11) NOT NULL AUTO_INCREMENT,&#39;
            for attr,value in attr_dict.items():
                sql_mid = sql_mid + &#39;`&#39;+attr + &#39;`&#39;+&#39; &#39;+ value+&#39;,&#39;
            sql = sql + &#39;CREATE TABLE IF NOT EXISTS %s (&#39;%table
            sql = sql + sql_mid
            sql = sql + constraint
            sql = sql + &#39;) ENGINE=InnoDB DEFAULT CHARSET=utf8&#39;
            print &#39;_createTable:&#39;+sql
            self._exeCuteCommit(sql)        
            
        #查询表内容
        #cond_dict:{&#39;name&#39;:&#39;xiaoming&#39;...}
        #order:&#39;order by id desc&#39;
        def _select(self,table,cond_dict=&#39;&#39;,order=&#39;&#39;):
            consql = &#39; &#39;
        if cond_dict!=&#39;&#39;:           
                 for k,v in cond_dict.items():
                        consql = consql+k+&#39;=&#39;+v+&#39; and&#39;
                consql = consql + &#39; 1=1 &#39;
            sql = &#39;select * from %s where &#39;%table
            sql = sql + consql + order            
            print &#39;_select:&#39;+sql            
            return self._exeCute(sql)        
            
        #插入单条数据
        def _insert(self,table,attrs,value):
            #values_sql = [&#39;%s&#39; for v in attrs]
            attrs_sql = &#39;(&#39;+&#39;,&#39;.join(attrs)+&#39;)&#39;
            values_sql = &#39; values(&#39;+&#39;,&#39;.join(value)+&#39;)&#39;
            sql = &#39;insert into %s&#39;%table
            sql = sql + attrs_sql + values_sql        
            print &#39;_insert:&#39;+sql
            self._exeCuteCommit(sql)        
            #插入多条数据
        #attrs:[id,name,...]
        #values:[[1,&#39;jack&#39;],[2,&#39;rose&#39;]]
        def _insertMany(self,table,attrs,values):
            values_sql = [&#39;%s&#39; for v in attrs]
            attrs_sql = &#39;(&#39;+&#39;,&#39;.join(attrs)+&#39;)&#39;
            values_sql = &#39; values(&#39;+&#39;,&#39;.join(values_sql)+&#39;)&#39;
            sql = &#39;insert into %s&#39;%table
            sql = sql + attrs_sql + values_sql            
            print &#39;_insertMany:&#39;+sql            
            try:            
            print sql            
            #print values
            for i in range(0,len(values),20000):
                    self.cursor.executemany(sql,values[i:i+20000])
                    self.conn.commit()            
            except MySQLdb.Error,e:
                self.conn.rollback()
                error = &#39;_insertMany executemany failed! ERROR (%s): %s&#39; %(e.args[0],e.args[1])             
                    print error
                    sys.exit()       
        def _now(self):
            now0 = datetime.datetime.now()
            now = now0.strftime(&#39;%Y-%m-%d %H:%M:%S&#39;)            
            print now        
      def _close(self):
            self.cursor.close()
            self.conn.close()    
      def __del__(self):
        self._close()if __name__ == &#39;__main__&#39;:
    a = mysqldb(&#39;localhost&#39;,&#39;root&#39;,&#39;www&#39;,&#39;test&#39;,&#39;utf8&#39;)
    a._now()
        table=&#39;test_mysqldb&#39;
        attrs={&#39;name&#39;:&#39;varchar(200) DEFAULT NULL&#39;,&#39;age&#39;:&#39;int(11) DEFAULT NULL&#39;}
        constraint=&#39;PRIMARY KEY(`id`)&#39;
        a._createTable(table,attrs,constraint)
    col = [&#39;name&#39;,&#39;age&#39;]
    val = [&#39;\&#39;xiegonghai\&#39;&#39;,&#39;25&#39;]
    a._insert(&#39;test_mysqldb&#39;,col,val)    
       print a._select(table)

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