Implementation steps of Django's library management system (with code)

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Add, Delete, Modify and Query of Publishers

Display the list of publishers:

1. Create a table structure:

2. Combine those two commands to create a press table

##Create the publishing house function and configure it in the url

Create an HTML page to display the publishing house’s table

for loop

{% for i in ret %} ---- Template language

i refers to the object obtained from ret
{{ forloop.counter }}                                                                                                      ; for the count from 1 to count
{{forloop.Counter0}}-& gt; for loop starting from 0
{ % endFor %}

# This Add a publishing house (add it to the original table)

To add a publishing house, jump to the add page first and create the add publishing house function (configured in the url):

Create an add page

Submit the information entered on the page to a dictionary in the form of post, encapsulate it into the name key value, and finally pass it to press_add

Completed addition and display:

You can also create a tag on the publisher list page, click to jump Go to the add page

Delete publisher:

Add a delete operation in the publisher list, click Delete item, and put the item to be deleted in the database Delete.

Indicate in the html page of the publishing house list the object to receive the request after clicking the "delete" request.

Create a function to delete a publishing house: that is, create a function to receive a request and process the request.

Edit publishing house

Modify the information of the original publishing house, add the 'Edit' option to the original list, click this option to jump to the editing page.

Create a function for editing the publishing house (and Complete the configuration) Modify and synchronize the database in the function

Create the edited HTML page

Add, delete, modify and query books

Create a list of books in the database:

Create the table structure class of books in models through those two commands in the database Create a table

#Create a function that operates on the book list (and configure it in the url)

Create an html page displayed on the front end

Note: To operate the table in the function, you need to use the table structure class written in the ORM language. Get table information

#The output Press object object is a publishing house object obtained through a foreign key. You can also print out the publishing house name: print(data[0].press. name)

###

In addition, data[0].press_id can query the publisher ID associated with this book through foreign keys. During the process of creating the table structure in the class, creating foreign keys will automatically create foreign keys in the database. Associated id, the foreign key id at this time is in this table.

data[0].press.id can also be queried with this The publisher id associated with this book is queried through the join table. .press is the object of the publisher. .id can naturally obtain the publisher id related to data[0].

Add books

Create the operation function for adding books (configured in the url)

(Note: The name in the above picture is wrong, the books in the table structure The name title is title)

Create an add page

Delete books

Add a delete operation item in the book list, click the operation item Jump to the delete function to perform the deletion operation.

Create the operation function of the book to be deleted

Edit the book

In the book page, add the option of editing operations, select the book object to be edited, jump to the page to modify, and then save.

Create the operation function for editing books (and configure it):

　

Note: The 'return' at the end means that when the information has not been edited, you need to jump to the editing page first and follow the selected Edit the information of the good object. After the editing is completed, submit it.

Create the editing page:

Check the author’s deletions and modifications (many-to-many)

An author can write multiple books, and a book can also have multiple authors.

Create the relationship between the author and the book

Method 1:

# 作者:
class Author(models.Model):
    id = models.AuthorField(primary_key=True) # 自增id主键
    name = models.CharField(max_length=32) # 作者名字
# 创建作者和书籍的关系表
class Author2Book(models.Model):
    id = models.AuthorField(primary_key=True)
    author = models.Foreignkey(to='Author', on_delete=models.CASCADE)
    book = models.Foreignkey(to='Book', on_delete=models.CASCADE)

Method 2 (created with orm)

class Author(models.Model):
    id = models.AuthorField(primary_key=True) # 自增id主键
    name = models.CharField(max_length=32) # 作者名字
    books = models.ManyToManyField(to='Book')

Query: Find all author information in the database, and then display it on the page

Create the author function and configure it

##Create html file and display it on the page

Add: Create a function for the add operation, display the add page, obtain the user's added information, return it to the database, and then display the author information .

Create a function to add operations and configure it

Create a page to obtain information

##Delete and edit

Add delete operation items in the author list and lock the objects to be deleted,

Create the operation function to be deleted,

##Add the editing operation in the author list, Lock the object to be edited

Create the editing function and configure it:

Create html page, displays the editing page and obtains the information filled in by the user

Note: template language, in judgment {% if book in author.books.all %} means the book If it is in the list of books associated with the author.

ORM Editing many-to-many cannot edit the third table directly. You must use the method provided by ORM:

all(); add(id1, id2); set([id1, id2]); clear() clear

Upload file

创建上传文件的操作函数,并配置好

创建上传文件的html页面　　

enctype="multipart/form-data" 是文件操作必须要有的

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