Python的Sql数据库增删改查操作简单封装方法

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

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()

#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

#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