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This article mainly explains "how to realize the dbm operation of uploading works on flask". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn "how to realize the dbm operation of uploading works on flask".

First, preface

Demand:

Activities need to be manually defined as historical activities, not automatically changed into historical activities by year.

Second, dbm database operation-match_set2.1, the backend responds to the request

Added should route-match_set.

The code block above explains:

This part is the content that the front-end user requests match_set and the back-end returns to the front-end.

The principle is to traverse the contents of the dbm database we need and put it in the right place. Pass it to the front end.

As follows:

| Baotou City second Cultural Tourism Creative works Competition | 2jue 2023 | Zhu Bo's individual work Competition |, 2024 | Zhu Bo's Competition | 2025 | Zhu Bo my Competition |, 2026 | Zhu Bo my Competition | 2027 | Zhu Bo mine

Contest |, 2028 | Zhu Bo my your contest |, 2029 | Zhu Bo my your contest |, 2030 | Zhu Bo my your contest |', 'pw_nums':' 3', 'btn_3':' results | / result', 'btn_1':' upload

Work | / new_post', 'match_name':' Zhu Bo my your contest', 'upload':' false', 'btn_4':' past Review | / past', 'time':' 1, 'match':' 2030, 'time_3_posts'

:'', 'btn_5':' judges' entry | / admin', 'time_2_posts':' 1, 'switch':', 'picture':', 'image':' upright 2566611882, 1193878858

= JPEG.webp'

It's for the test. it's a little messy.

2.2. The front end returns the form target event name: target event logo: target event setting (1: not set to historical event 2: set to historical event): submit

The front end is like above, a very simple collection form.

The front end initiates the submit button, which is submitted to the back end, and then processed by the back end.

2.3.The backend responds again. Save operation if request.method = = "POST":

The above code explanation: judge that the front end is transferred to the back end in the way of post.

If key = "match": # print ("current path is 1") if "past_matchs" in db_config: if value not in db_config ["past_matchs"] .decode (): flag=0 else: # print ("current path is 4") past_matchss = db_config ["past_matchs"] .decode () .split (' ') # print (db_config ["past_matchs"] .decode ()) # print (past_matchss) for i in past_matchss: jj=i break

The code block above explains: [this is a lot of code. Show part of the code, post all the code below. ]

The logic here is complex, because when we traverse, we traverse his key and value.

We found the target key = = "match":.

The following judgment. Execute {if our dbm database contains past_matchs

If our target value value is no longer in the dbm database, let's assign the flag to 0. 0. The judgment below is that if flag==0 states that {the event does not exist}

If the value value is in the dbm database {

Past_matchss = db_config ["past_matchs"] .decode () .split (',')

Gets the target value.

Such as the code logic above. [roughly speaking: I rewrote a category, and because I couldn't delete it, I chose to re-assign to traverse, accumulate]

Finally:

If (flag==0): flash ("the event does not exist") if (flag==1): db.session.commit () flash ("submitted successfully", "success") return redirect (url_for ('match_set'))

The above code explains:

Because we assigned flag a value of 1. If no target value is in our database, falg will be assigned a value of 0.

The operation of changing the database is not performed. Otherwise, change.

Finally, redirect to the target page, this section ends!

three, Code @ min_role_required (ROLES ["mod"]) @ app.route ('/ match_set/', methods= ['GET',' POST']) def match_set (): flag=1 if request.method = = "POST": switch2='' for key, value in request.form.items (): if key = = "switch": switch2=value for key Value in request.form.items (): # print ("tag key", key) # print ("tag value" Value) if key = = "match": # print ("current path is 1") if "past_matchs" in db_config: if value not in db_config ["past_matchs"] .decode (): flag=0 else: # Print ("current path is 4") past_matchss = db_config ["past_matchs"] .decode () .split (' ') # print (db_config ["past_matchs"] .decode ()) # print (past_matchss) for i in past_matchss: jj=i break iip=0 For i in past_matchss: if (iip > 0): # print (I) if (value not in i): jj=jj+ " "+ I if (value in i): # print (switch2) if (i.split (" | ") [2] = = switch2): jj=jj+" "+ I # print (" correct ") else: # print (value+" | "+ request.form.get ('match_name') +" | "+ switch2) jj=jj+" "+ (value+" | "+ request.form.get ('match_name') +" | "+ switch2) # print (" error ") # print (I) iip=iip+1 db_config [" past_matchs "] = jj Else: db_config ["past_matchs"] = f "{value} | {request.form.get ('match_name')} | {request.form.get (' switch')}" # print ("current path is 3") if (flag==0): flash ("the event does not exist") if (flag==1): Db.session.commit () flash ("submitted successfully" "success") return redirect (url_for ('match_set')) attrs_dict = {} for k in db_config.keys (): attrs_dict [k.decode ()] = db_ config.decode () # print (attrs_dict) past_matchs = db_config ["past_matchs"] .decode () .split (' ') past_qian=db_config ["match"] .decode () pasts = [] for match_tuple in past_matchs: if not match_tuple: continue match_mark = match_tuple.split ("|") [0] match_name = match_tuple.split ("|") [1] match_zhuangtai = match_tuple.split ("|") [2] data = {} data ["title"] = match_name data ["count"] = Post.query.filter_by (match=match_mark). Count () data ["url"] = url_for ('index' Match=match_mark) data ["zhuangtai"] = match_zhuangtai data ["muqian"] = past_qian data ["biaoshi"] = match_mark pasts.append (data) # return render_template ('past.html', pasts=pasts) return render_template (' admin/match_set.html', pasts=pasts) so far I believe you have a deeper understanding of "how to achieve the dbm operation of flask uploaded works". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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