Python+Django+SAE系列课程13-MySQL记录的添删改
Python+Django+SAE系列教程13-----MySQL记录的添\删\改 建立了数据库后,我们就来做一个简单的表( person_classroom )的添加、删除、修改的操作。 首先我们建立一个添加的页面的模板 Classroom_Add.html(添加的表单) 并把它放在 Bidding\templates\person
Python+Django+SAE系列教程13-----MySQL记录的添\删\改建立了数据库后,我们就来做一个简单的表(person_classroom)的添加、删除、修改的操作。
首先我们建立一个添加的页面的模板Classroom_Add.html(添加的表单)并把它放在Bidding\templates\person中:
Classroom_Add.html:
数据库操作简单表的添加 这里是Classroom的添加页面
{% if error %}请输入班级名称和导师姓名
{% endif %}
Classroom_Add_results.html:
查询用户结果页
班级:{{name}}添加成功 ! |
点击返回 |
然后建立对应的view,我们修改person/views.py 文件
Views.py:
# -*- coding: utf-8 -*- from django.shortcuts import render_to_response from django.db import connection,transaction from person.models import * def ClassroonAdd(request): if 'name' in request.GET and request.GET['name'] and 'tutor' in request.GET and request.GET['tutor']: name = request.GET['name'] tutor = request.GET['tutor'] cursor=connection.cursor() sql='insert into person_classroom (name,tutor) values (\''+name+'\',\''+tutor+'\')' cursor.execute(sql) transaction.commit_unless_managed() cursor.close() return render_to_response('person/Classroom_Add_results.html', {'name': name}) else: return render_to_response('person/Classroom_Add.html', {'error': True})
在修改一下urls.py文件:
from django.conf.urls import patterns, include, url # Uncomment the next two lines to enable the admin: # from django.contrib import admin # admin.autodiscover() urlpatterns = patterns('', # Examples: # url(r'^$', 'Bidding.views.home', name='home'), # url(r'^Bidding/', include('Bidding.foo.urls')), # Uncomment the admin/doc line below to enable admin documentation: # url(r'^admin/doc/', include('django.contrib.admindocs.urls')), # Uncomment the next line to enable the admin: # url(r'^admin/', include(admin.site.urls)), url(r'^hello/$', 'Bidding.views.hello'), url(r'^time/$', 'Bidding.views.current_datetime'), url(r'^time/plus/(\d{1,2})/$', 'Bidding.views.hours_ahead'), url(r'^hello_base/$', 'Bidding.views.hello_base'), url(r'^request_test/$', 'Bidding.views.request_test'), url(r'^UsersSearch/$', 'Bidding.Users.views.search_form'), url(r'^search/$', 'Bidding.Users.views.search'), url(r'^ClassRoom/add/$', 'person.views.ClassroonAdd'), )
这时我们的添加就做好了,访问一下classroom/add这个 页面,就可以看到结果了。
不过上面我们所说的办法是执行一个原始的sql语句,这个方式其实并不是Django推荐的,我们可以直接使用models操作数据库的方法,改造一下ClassroomAdd这个视图:
def ClassroonAdd(request): if 'name' in request.GET and request.GET['name'] and 'tutor' in request.GET and request.GET['tutor']: name = request.GET['name'] tutor = request.GET['tutor'] c = ClassRoom(name=name,tutor=tutor) c.save() return render_to_response('person/Classroom_Add_results.html', {'name': name}) else: return render_to_response('person/Classroom_Add.html', {'error': True})
这样的方法即简单,有不用我们很多sql的语法,并且最重要的是如果更换数据库类型(sqlserver->oracle),也不会因为受sql语法不一致的影响。
在接下来,我们来做一个列表页,把数据库中的Classroom表的记录以一个表格的形式显示出来。还是从模板先入手,建立一个Classroom_List.html,放入Bidding\templates\person文件夹下:
Classroom_List.html:
数据库操作简单表的添加 这里是Classroom的管理页面
序号 | 班级名称 | 导师姓名 |
{{ myclass.id }} | {{ myclass.name }} | {{ myclass.tutor }} |
添加视图:
# -*- coding: utf-8 -*- from django.shortcuts import render_to_response from django.db import connection,transaction from person.models import * def ClassroonAdd(request): if 'name' in request.GET and request.GET['name'] and 'tutor' in request.GET and request.GET['tutor']: name = request.GET['name'] tutor = request.GET['tutor'] cursor=connection.cursor() sql='insert into person_classroom (name,tutor) values (\''+name+'\',\''+tutor+'\')' cursor.execute(sql) transaction.commit_unless_managed() cursor.close() return render_to_response('person/Classroom_Add_results.html', {'name': name}) else: return render_to_response('person/Classroom_Add.html', {'error': True}) def ClassroonAdd(request): if 'name' in request.GET and request.GET['name'] and 'tutor' in request.GET and request.GET['tutor']: name = request.GET['name'] tutor = request.GET['tutor'] c = ClassRoom(name=name,tutor=tutor) c.save() return render_to_response('person/Classroom_Add_results.html', {'name': name}) else: return render_to_response('person/Classroom_Add.html', {'error': True}) def ClassroonList(request): cursor=connection.cursor() sql='select id,name,tutor from person_classroom' ClassroonList=ClassRoom.objects.raw(sql) return render_to_response('person/Classroom_List.html', {'ClassroonList': ClassroonList})
配置urls.py:
from django.conf.urls import patterns, include, url # Uncomment the next two lines to enable the admin: # from django.contrib import admin # admin.autodiscover() urlpatterns = patterns('', # Examples: # url(r'^$', 'Bidding.views.home', name='home'), # url(r'^Bidding/', include('Bidding.foo.urls')), # Uncomment the admin/doc line below to enable admin documentation: # url(r'^admin/doc/', include('django.contrib.admindocs.urls')), # Uncomment the next line to enable the admin: # url(r'^admin/', include(admin.site.urls)), url(r'^hello/$', 'Bidding.views.hello'), url(r'^time/$', 'Bidding.views.current_datetime'), url(r'^time/plus/(\d{1,2})/$', 'Bidding.views.hours_ahead'), url(r'^hello_base/$', 'Bidding.views.hello_base'), url(r'^request_test/$', 'Bidding.views.request_test'), url(r'^UsersSearch/$', 'Bidding.Users.views.search_form'), url(r'^search/$', 'Bidding.Users.views.search'), url(r'^ClassRoom/add/$', 'person.views.ClassroonAdd'), url(r'^ClassRoom/list/$', 'person.views.ClassroonList'), )
如同上述讨论的一样,我们现在的视图执行的是一个原始的sql,现在我们需要用models来修改一下:
def ClassroonList(request): cursor=connection.cursor() ClassroonList=ClassRoom.objects.all() #ClassroonList=ClassRoom.objects.filter(name__icontains='大') return render_to_response('person/Classroom_List.html', {'ClassroonList': ClassroonList})
如果需要执行where或者order by等操作可以这样:
ClassroonList=ClassRoom.objects.filter(name__icontains='大').order_by(‘name’)
这里还有很多关于选择的内容以后我们逐渐会介绍到。
做完了列表页,我们在来做一个修改的页面,思路是这样的:在列表页中的每一行的后面添加一列“修改”按钮,点击按钮后跳转到修改页面,首先以此条记录的主键专递到修改页面,在修改页面中要先读取出数据库中的信息,然后点击确定按钮以后执行修改操作。
我们首先来修改这个管理页面的模板:
Classroom_List.html:
数据库操作简单表的添加 这里是Classroom的管理页面
序号 | 班级名称 | 导师姓名 | 操作 |
{{ myclass.id }} | {{ myclass.name }} | {{ myclass.tutor }} |
建立一个Classroom_Modify.html模板,把它放在Bidding\templates\person文件夹下
Classroom_Modify.html:
数据库操作简单表的修改 这里是Classroom--{{name}}的修改页面
{% if error %}请输入班级名称和导师姓名
{% endif %}
Classroom_Modify_results.html:
查询用户结果页
修改前 | 修改后 | |
班级名称: | {{old_name}} | {{new_name}} |
导师姓名: | {{old_tutor}} | {{new_tutor}} |
修改成功! | ||
点击返回 |
添加视图:
def ClassroonModify(request,id1): cursor=connection.cursor() sql='select id,name,tutor from person_classroom where id='+id1 ClassroonList=ClassRoom.objects.raw(sql) old_name = ClassroonList[0].name old_tutor = ClassroonList[0].tutor if 'name' in request.GET and request.GET['name'] and 'tutor' in request.GET and request.GET['tutor']: new_name = request.GET['name'] new_tutor = request.GET['tutor'] cursor=connection.cursor() sql='update person_classroom set name=\''+new_name+'\',tutor=\''+new_tutor+'\' where id=\''+id1+'\'' cursor.execute(sql) transaction.commit_unless_managed() cursor.close() return render_to_response('person/Classroom_Modify_results.html', {'old_name': old_name,'old_tutor':old_tutor,'new_name':new_name,'new_tutor':new_tutor}) else: return render_to_response('person/Classroom_Modify.html', {'error': True,'id':id1,'name':old_name,'tutor':old_tutor})
编辑urls.py,这里面需要注意的是正则的写法,这个之前的章节已经说过了,这里我们可以再复习一遍:
from django.conf.urls import patterns, include, url # Uncomment the next two lines to enable the admin: # from django.contrib import admin # admin.autodiscover() urlpatterns = patterns('', # Examples: # url(r'^$', 'Bidding.views.home', name='home'), # url(r'^Bidding/', include('Bidding.foo.urls')), # Uncomment the admin/doc line below to enable admin documentation: # url(r'^admin/doc/', include('django.contrib.admindocs.urls')), # Uncomment the next line to enable the admin: # url(r'^admin/', include(admin.site.urls)), url(r'^hello/$', 'Bidding.views.hello'), url(r'^time/$', 'Bidding.views.current_datetime'), url(r'^time/plus/(\d{1,2})/$', 'Bidding.views.hours_ahead'), url(r'^hello_base/$', 'Bidding.views.hello_base'), url(r'^request_test/$', 'Bidding.views.request_test'), url(r'^UsersSearch/$', 'Bidding.Users.views.search_form'), url(r'^search/$', 'Bidding.Users.views.search'), url(r'^ClassRoom/add/$', 'person.views.ClassroonAdd'), url(r'^ClassRoom/list/$', 'person.views.ClassroonList'), url(r'^ClassRoom/modify/(\d+)/$', 'person.views.ClassroonModify'), )
如同添加时候的问题,我们这里面使用的仍然是最原始的sql语句,我们同样可以给他修改成为model的方式:
def ClassroonModify(request,id1): cursor=connection.cursor() Classroon=ClassRoom.objects.get(id=id1) old_name = Classroon.name old_tutor = Classroon.tutor cursor.close() if 'name' in request.GET and request.GET['name'] and 'tutor' in request.GET and request.GET['tutor']: new_name = request.GET['name'] new_tutor = request.GET['tutor'] Classroon.name=new_name Classroon.tutor=new_tutor Classroon.save() return render_to_response('person/Classroom_Modify_results.html', {'old_name': old_name,'old_tutor':old_tutor,'new_name':new_name,'new_tutor':new_tutor}) else: return render_to_response('person/Classroom_Modify.html', {'error': True,'id':id1,'name':old_name,'tutor':old_tutor})
这样看起来是不是简便多了?我们打开 页面看看效果吧 :
接下来我们来做删除的功能,首先修改列表页的模板,加入一列删除按钮:
数据库操作简单表的添加 这里是Classroom的管理页面
序号 | 班级名称 | 导师姓名 | 操作 |
{{ myclass.id }} | {{ myclass.name }} | {{ myclass.tutor }} |
Classroom_Delete_results.html:
查询用户结果页
班级:{{name}}删除成功 ! |
点击返回 |
修改视图:
def ClassroonDelete(request,id1): cursor=connection.cursor() Classroon=ClassRoom.objects.get(id=id1) old_name = Classroon.name Classroon.delete() ClassroonList=ClassRoom.objects.all() cursor.close() return render_to_response('person/Classroom_Delete_results.html',{'name':old_name})
配置urls.py:
from django.conf.urls import patterns, include, url # Uncomment the next two lines to enable the admin: # from django.contrib import admin # admin.autodiscover() urlpatterns = patterns('', # Examples: # url(r'^$', 'Bidding.views.home', name='home'), # url(r'^Bidding/', include('Bidding.foo.urls')), # Uncomment the admin/doc line below to enable admin documentation: # url(r'^admin/doc/', include('django.contrib.admindocs.urls')), # Uncomment the next line to enable the admin: # url(r'^admin/', include(admin.site.urls)), url(r'^hello/$', 'Bidding.views.hello'), url(r'^time/$', 'Bidding.views.current_datetime'), url(r'^time/plus/(\d{1,2})/$', 'Bidding.views.hours_ahead'), url(r'^hello_base/$', 'Bidding.views.hello_base'), url(r'^request_test/$', 'Bidding.views.request_test'), url(r'^UsersSearch/$', 'Bidding.Users.views.search_form'), url(r'^search/$', 'Bidding.Users.views.search'), url(r'^ClassRoom/add/$', 'person.views.ClassroonAdd'), url(r'^ClassRoom/list/$', 'person.views.ClassroonList'), url(r'^ClassRoom/modify/(\d+)/$', 'person.views.ClassroonModify'), url(r'^ClassRoom/delete/(\d+)/$', 'person.views.ClassroonDelete'), )
到此,我们就做好了一个简单的表的添加、删除、修改的操作。