Python+Django+SAE系列教程13-----MySQL记录的添\删\改
2017-04-14 17:54
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建立了数据库后,我们就来做一个简单的表(person_classroom)的加入、删除、改动的操作。
首先我们建立一个加入的页面的模板Classroom_Add.html(加入的表单)并把它放在Bidding\templates\person中:
Classroom_Add.html:
Classroom_Add_results.html:
然后建立相应的view,我们改动person/views.py 文件
Views.py:
在改动一下urls.py文件:
这时我们的加入就做好了,訪问一下classroom/add这个 页面,就能够看到结果了。
只是上面我们所说的办法是运行一个原始的sql语句,这个方式事实上并非Django推荐的,我们能够直接使用models操作数据库的方法。改造一下ClassroomAdd这个视图:
这个方案即简单,有不用我们非常多sql的语法。而且最重要的是假设更换数据库类型(sqlserver->oracle)。也不会由于受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目录下:
Classroom_List.html:
加入视图:
配置urls.py:
如同上述讨论的一样,我们如今的视图运行的是一个原始的sql,如今我们须要用models来改动一下:
假设须要运行where或者order by等操作能够这样:
ClassroonList=ClassRoom.objects.filter(name__icontains='大').order_by(‘name’)
这里还有非常多关于选择的内容以后我们逐渐会介绍到。
做完了列表页,我们在来做一个改动的页面,思路是这种:在列表页中的每一行的后面加入一列“改动”button。点击button后跳转到改动页面。首先以此条记录的主键专递到改动页面,在改动页面中要先读取出数据库中的信息。然后点击确定button以后运行改动操作。
我们首先来改动这个管理页面的模板:
Classroom_List.html:
建立一个Classroom_Modify.html模板。把它放在Bidding\templates\person目录下
Classroom_Modify.html:
Classroom_Modify_results.html:
加入视图:
编辑urls.py。这里面须要注意的是正则的写法,这个之前的章节已经说过了,这里我们能够再复习一遍:
如同加入时候的问题,我们这里面使用的仍然是最原始的sql语句,我们相同能够给他改动成为model的方式:
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,首先改动列表页的模板。增加一列删除button:
Classroom_Delete_results.html:
改动视图:
配置urls.py:
到此,我们就做好了一个简单的表的加入、删除、改动的操作。
首先我们建立一个加入的页面的模板Classroom_Add.html(加入的表单)并把它放在Bidding\templates\person中:
Classroom_Add.html:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <html> <head> <title>数据库操作简单表的加入</title> </head> <body> <h1>这里是Classroom的加入页面</h1> {% if error %} <p style="color: red;">请输入班级名称和导师姓名</p> {% endif %} <form action="" method="get"> <table border="1" cellpadding="10"> <tr> <td align="center">项目</td> <td align="center">内容</td> </tr> <tr> <td align="right">班级名称:</td> <td><input type="text" name="name"></td> </tr> <tr> <td align="right">导师姓名:</td> <td><input type="text" name="tutor"></td> </tr> <tr> <td colspan="2"><input type="submit" value="加入"></td> </tr> </table> </form> </body> </html>
Classroom_Add_results.html:
<html> <head> <title>查询用户结果页</title> </head> <body> <table border="1" cellpadding="5"><tr> <td>班级:{{name}}加入成功 !</td></tr> <tr> <td><a href="http://127.0.0.1:8000/ClassRoom/add/">点击返回</a></td> </tr> </table> </body> </html>上面的 这个文件时加入后的结果页。
然后建立相应的view,我们改动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})
在改动一下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'), )
这时我们的加入就做好了,訪问一下classroom/add这个 页面,就能够看到结果了。
只是上面我们所说的办法是运行一个原始的sql语句,这个方式事实上并非Django推荐的,我们能够直接使用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})
这个方案即简单,有不用我们非常多sql的语法。而且最重要的是假设更换数据库类型(sqlserver->oracle)。也不会由于受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目录下:
Classroom_List.html:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <html> <head> <title>数据库操作简单表的加入</title> </head> <body> <h1>这里是Classroom的管理页面</h1> <table border="1" cellpadding="10"> <tr> <td align="center">序号</td> <td align="center">班级名称</td> <td align="center">导师姓名</td> </tr> {% for myclass in ClassroonList%} <tr> <td align="right">{{ myclass.id }}</td> <td align="right">{{ myclass.name }}</td> <td align="right">{{ myclass.tutor }}</td> </tr> {% endfor %} </table> </body> </html>
加入视图:
# -*- 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,我们如今的视图运行的是一个原始的sql,如今我们须要用models来改动一下:
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})
假设须要运行where或者order by等操作能够这样:
ClassroonList=ClassRoom.objects.filter(name__icontains='大').order_by(‘name’)
这里还有非常多关于选择的内容以后我们逐渐会介绍到。
做完了列表页,我们在来做一个改动的页面,思路是这种:在列表页中的每一行的后面加入一列“改动”button。点击button后跳转到改动页面。首先以此条记录的主键专递到改动页面,在改动页面中要先读取出数据库中的信息。然后点击确定button以后运行改动操作。
我们首先来改动这个管理页面的模板:
Classroom_List.html:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <html> <head> <title>数据库操作简单表的加入</title> </head> <body> <h1>这里是Classroom的管理页面</h1> <table border="1" cellpadding="10"> <tr> <td align="center">序号</td> <td align="center">班级名称</td> <td align="center">导师姓名</td> <td align="center">操作</td> </tr> {% for myclass in ClassroonList%} <tr> <td align="right">{{ myclass.id }}</td> <td align="right">{{ myclass.name }}</td> <td align="right">{{ myclass.tutor }}</td> <td align="right"><input type="button" onClick="Modify({{ myclass.id }})" value="改动"></td> </tr> {% endfor %} </table> <script language="javascript"> function Modify(id) { location.href='../Modify/'+id } </script> </body> </html>
建立一个Classroom_Modify.html模板。把它放在Bidding\templates\person目录下
Classroom_Modify.html:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <html> <head> <title>数据库操作简单表的改动</title> </head> <body> <h1>这里是Classroom--{{name}}的改动页面</h1> {% if error %} <p style="color: red;">请输入班级名称和导师姓名</p> {% endif %} <form action="" method="get"> <table border="1" cellpadding="10"> <tr> <td align="center">项目</td> <td align="center">内容</td> </tr> <tr> <td align="right">班级名称:</td> <td><input type="text" name="name" value="{{name}}"></td> </tr> <tr> <td align="right">导师姓名:</td> <td><input type="text" name="tutor" value="{{tutor}}"></td> </tr> <tr> <td colspan="2"> <input type="hidden" name="id" value="{{id}}"> <input type="submit" value="改动"> <input type="button" value="返回" onClick="location.href='../../list'"> </td> </tr> </table> </form> </body> </html>
Classroom_Modify_results.html:
<html> <head> <title>查询用户结果页</title> </head> <body> <table border="1" cellpadding="5"><tr> <td align="center"> </td> <td align="center">改动前</td> <td align="center">改动后</td> </tr> <tr> <td align="right">班级名称:</td> <td align="right">{{old_name}}</td> <td align="right">{{new_name}}</td> </tr> <tr> <td align="right">导师姓名:</td> <td align="right">{{old_tutor}}</td> <td align="right">{{new_tutor}}</td> </tr> <tr> <td colspan="3" align="center">改动成功!</td> </tr> <tr> <td colspan="3" align="center"><a href="../../list/">点击返回</a></td> </tr> </table> </body> </html>
加入视图:
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。这里面须要注意的是正则的写法,这个之前的章节已经说过了,这里我们能够再复习一遍:
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'), )
如同加入时候的问题,我们这里面使用的仍然是最原始的sql语句,我们相同能够给他改动成为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,首先改动列表页的模板。增加一列删除button:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> <html> <head> <title>数据库操作简单表的加入</title> </head> <body> <h1>这里是Classroom的管理页面</h1> <table border="1" cellpadding="10"> <tr> <td align="center">序号</td> <td align="center">班级名称</td> <td align="center">导师姓名</td> <td align="center">操作</td> </tr> {% for myclass in ClassroonList%} <tr> <td align="right">{{ myclass.id }}</td> <td align="right">{{ myclass.name }}</td> <td align="right">{{ myclass.tutor }}</td> <td align="right"><input type="button" onClick="Modify({{ myclass.id }})" value="改动"> <input type="button" onClick="Delete({{ myclass.id }})" value="删除"> </td> </tr> {% endfor %} </table> <script language="javascript"> function Modify(id) { location.href='../modify/'+id } function Delete(id) { location.href='../delete/'+id } </script> </body> </html>
Classroom_Delete_results.html:
<html> <head> <title>查询用户结果页</title> </head> <body> <table border="1" cellpadding="5"><tr> <td>班级:{{name}}删除成功 !</td></tr> <tr> <td><a href="http://127.0.0.1:8000/ClassRoom/list/">点击返回</a></td> </tr> </table> </body> </html>
改动视图:
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加入、删除、改动的操作。
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