Python Sql数据库增删改查操作简单封装

本文实例为大家分享了如何利用Python对数据库的增删改查进行简单的封装，供大家参考，具体内容如下

1.insert

    import mysql.connector
    import os
    import codecs
    #设置数据库用户名和密码
    user='root';#用户名
    pwd='root';#密码
    host='localhost';#ip地址
    db='mysql';#所要操作数据库名字
    charset='UTF-8'
    cnx = mysql.connector.connect(user=user,password=pwd, host=host, database=db)
    #设置游标
    cursor = cnx.cursor(dictionary=True)
    #插入数据
    #print(insert('gelixi_help_type',{'type_name':'\'sddfdsfs\'','type_sort':'283'}))
    def insert(table_name,insert_dict):
      param='';
      value='';
      if(isinstance(insert_dict,dict)):
        for key in insert_dict.keys():
          param=param+key+","
          value=value+insert_dict[key]+','
        param=param[:-1]
        value=value[:-1]
      sql="insert into %s (%s) values(%s)"%(table_name,param,value)
      cursor.execute(sql)
      id=cursor.lastrowid
      cnx.commit()
      return id

2.delete

    def delete(table_name,where=''):
      if(where!=''):
        str='where'
        for key_value in where.keys():
          value=where[key_value]
          str=str+' '+key_value+'='+value+' '+'and'
        where=str[:-3]
        sql="delete from %s %s"%(table_name,where)
        cursor.execute(sql)
        cnx.commit()

3.select

    #取得数据库信息
    # print(select({'table':'gelixi_help_type','where':{'help_show': '1'}},'type_name,type_id'))
    def select(param,fields='*'):
      table=param['table']
      if('where' in param):
        thewhere=param['where']
        if(isinstance (thewhere,dict)):
          keys=thewhere.keys()
          str='where';
          for key_value in keys:
            value=thewhere[key_value]
            str=str+' '+key_value+'='+value+' '+'and'
          where=str[:-3]
      else:
        where=''
      sql="select %s from %s %s"%(fields,table,where)
      cursor.execute(sql)
      result=cursor.fetchall()
      return result

4.showtable,showcolumns

    #显示建表语句
    #table string 表名
    #return string 建表语句
    def showCreateTable(table):
      sql='show create table %s'%(table)
      cursor.execute(sql)
      result=cursor.fetchall()[0]
      return result['Create Table']
    #print(showCreateTable('gelixi_admin'))
    #显示表结构语句
    def showColumns(table):
      sql='show columns from %s '%(table)
      print(sql)
      cursor.execute(sql)
      result=cursor.fetchall()
      dict1={}
      for info in result:
        dict1[info['Field']]=info
      return dict1

以上就是Python Sql数据库增删改查操作的相关操作，希望对大家的学习有所帮助。